drivers/gpu/drm/i915/display/vlv_dsi.c

   1 /*
   2  * Copyright © 2013 Intel Corporation
   3  *
   4  * Permission is hereby granted, free of charge, to any person obtaining a
   5  * copy of this software and associated documentation files (the "Software"),
   6  * to deal in the Software without restriction, including without limitation
   7  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   8  * and/or sell copies of the Software, and to permit persons to whom the
   9  * Software is furnished to do so, subject to the following conditions:
  10  *
  11  * The above copyright notice and this permission notice (including the next
  12  * paragraph) shall be included in all copies or substantial portions of the
  13  * Software.
  14  *
  15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  16  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  18  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  19  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  20  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
  21  * DEALINGS IN THE SOFTWARE.
  22  *
  23  * Author: Jani Nikula <jani.nikula@intel.com>
  24  */
  25
  26 #include <linux/slab.h>
  27
  28 #include <drm/drm_atomic_helper.h>
  29 #include <drm/drm_crtc.h>
  30 #include <drm/drm_edid.h>
  31 #include <drm/drm_mipi_dsi.h>
  32
  33 #include "i915_drv.h"
  34 #include "intel_atomic.h"
  35 #include "intel_connector.h"
  36 #include "intel_display_types.h"
  37 #include "intel_dsi.h"
  38 #include "intel_fifo_underrun.h"
  39 #include "intel_panel.h"
  40 #include "intel_sideband.h"
  41
  42 /* return pixels in terms of txbyteclkhs */
  43 static u16 txbyteclkhs(u16 pixels, int bpp, int lane_count,
  44                        u16 burst_mode_ratio)
  45 {
  46         return DIV_ROUND_UP(DIV_ROUND_UP(pixels * bpp * burst_mode_ratio,
  47                                          8 * 100), lane_count);
  48 }
  49
  50 /* return pixels equvalent to txbyteclkhs */
  51 static u16 pixels_from_txbyteclkhs(u16 clk_hs, int bpp, int lane_count,
  52                         u16 burst_mode_ratio)
  53 {
  54         return DIV_ROUND_UP((clk_hs * lane_count * 8 * 100),
  55                                                 (bpp * burst_mode_ratio));
  56 }
  57
  58 enum mipi_dsi_pixel_format pixel_format_from_register_bits(u32 fmt)
  59 {
  60         /* It just so happens the VBT matches register contents. */
  61         switch (fmt) {
  62         case VID_MODE_FORMAT_RGB888:
  63                 return MIPI_DSI_FMT_RGB888;
  64         case VID_MODE_FORMAT_RGB666:
  65                 return MIPI_DSI_FMT_RGB666;
  66         case VID_MODE_FORMAT_RGB666_PACKED:
  67                 return MIPI_DSI_FMT_RGB666_PACKED;
  68         case VID_MODE_FORMAT_RGB565:
  69                 return MIPI_DSI_FMT_RGB565;
  70         default:
  71                 MISSING_CASE(fmt);
  72                 return MIPI_DSI_FMT_RGB666;
  73         }
  74 }
  75
  76 void vlv_dsi_wait_for_fifo_empty(struct intel_dsi *intel_dsi, enum port port)
  77 {
  78         struct drm_encoder *encoder = &intel_dsi->base.base;
  79         struct drm_device *dev = encoder->dev;
  80         struct drm_i915_private *dev_priv = to_i915(dev);
  81         u32 mask;
  82
  83         mask = LP_CTRL_FIFO_EMPTY | HS_CTRL_FIFO_EMPTY |
  84                 LP_DATA_FIFO_EMPTY | HS_DATA_FIFO_EMPTY;
  85
  86         if (intel_de_wait_for_set(dev_priv, MIPI_GEN_FIFO_STAT(port),
  87                                   mask, 100))
  88                 drm_err(&dev_priv->drm, "DPI FIFOs are not empty\n");
  89 }
  90
  91 static void write_data(struct drm_i915_private *dev_priv,
  92                        i915_reg_t reg,
  93                        const u8 *data, u32 len)
  94 {
  95         u32 i, j;
  96
  97         for (i = 0; i < len; i += 4) {
  98                 u32 val = 0;
  99
 100                 for (j = 0; j < min_t(u32, len - i, 4); j++)
 101                         val |= *data++ << 8 * j;
 102
 103                 intel_de_write(dev_priv, reg, val);
 104         }
 105 }
 106
 107 static void read_data(struct drm_i915_private *dev_priv,
 108                       i915_reg_t reg,
 109                       u8 *data, u32 len)
 110 {
 111         u32 i, j;
 112
 113         for (i = 0; i < len; i += 4) {
 114                 u32 val = intel_de_read(dev_priv, reg);
 115
 116                 for (j = 0; j < min_t(u32, len - i, 4); j++)
 117                         *data++ = val >> 8 * j;
 118         }
 119 }
 120
 121 static ssize_t intel_dsi_host_transfer(struct mipi_dsi_host *host,
 122                                        const struct mipi_dsi_msg *msg)
 123 {
 124         struct intel_dsi_host *intel_dsi_host = to_intel_dsi_host(host);
 125         struct drm_device *dev = intel_dsi_host->intel_dsi->base.base.dev;
 126         struct drm_i915_private *dev_priv = to_i915(dev);
 127         enum port port = intel_dsi_host->port;
 128         struct mipi_dsi_packet packet;
 129         ssize_t ret;
 130         const u8 *header, *data;
 131         i915_reg_t data_reg, ctrl_reg;
 132         u32 data_mask, ctrl_mask;
 133
 134         ret = mipi_dsi_create_packet(&packet, msg);
 135         if (ret < 0)
 136                 return ret;
 137
 138         header = packet.header;
 139         data = packet.payload;
 140
 141         if (msg->flags & MIPI_DSI_MSG_USE_LPM) {
 142                 data_reg = MIPI_LP_GEN_DATA(port);
 143                 data_mask = LP_DATA_FIFO_FULL;
 144                 ctrl_reg = MIPI_LP_GEN_CTRL(port);
 145                 ctrl_mask = LP_CTRL_FIFO_FULL;
 146         } else {
 147                 data_reg = MIPI_HS_GEN_DATA(port);
 148                 data_mask = HS_DATA_FIFO_FULL;
 149                 ctrl_reg = MIPI_HS_GEN_CTRL(port);
 150                 ctrl_mask = HS_CTRL_FIFO_FULL;
 151         }
 152
 153         /* note: this is never true for reads */
 154         if (packet.payload_length) {
 155                 if (intel_de_wait_for_clear(dev_priv, MIPI_GEN_FIFO_STAT(port),
 156                                             data_mask, 50))
 157                         drm_err(&dev_priv->drm,
 158                                 "Timeout waiting for HS/LP DATA FIFO !full\n");
 159
 160                 write_data(dev_priv, data_reg, packet.payload,
 161                            packet.payload_length);
 162         }
 163
 164         if (msg->rx_len) {
 165                 intel_de_write(dev_priv, MIPI_INTR_STAT(port),
 166                                GEN_READ_DATA_AVAIL);
 167         }
 168
 169         if (intel_de_wait_for_clear(dev_priv, MIPI_GEN_FIFO_STAT(port),
 170                                     ctrl_mask, 50)) {
 171                 drm_err(&dev_priv->drm,
 172                         "Timeout waiting for HS/LP CTRL FIFO !full\n");
 173         }
 174
 175         intel_de_write(dev_priv, ctrl_reg,
 176                        header[2] << 16 | header[1] << 8 | header[0]);
 177
 178         /* ->rx_len is set only for reads */
 179         if (msg->rx_len) {
 180                 data_mask = GEN_READ_DATA_AVAIL;
 181                 if (intel_de_wait_for_set(dev_priv, MIPI_INTR_STAT(port),
 182                                           data_mask, 50))
 183                         drm_err(&dev_priv->drm,
 184                                 "Timeout waiting for read data.\n");
 185
 186                 read_data(dev_priv, data_reg, msg->rx_buf, msg->rx_len);
 187         }
 188
 189         /* XXX: fix for reads and writes */
 190         return 4 + packet.payload_length;
 191 }
 192
 193 static int intel_dsi_host_attach(struct mipi_dsi_host *host,
 194                                  struct mipi_dsi_device *dsi)
 195 {
 196         return 0;
 197 }
 198
 199 static int intel_dsi_host_detach(struct mipi_dsi_host *host,
 200                                  struct mipi_dsi_device *dsi)
 201 {
 202         return 0;
 203 }
 204
 205 static const struct mipi_dsi_host_ops intel_dsi_host_ops = {
 206         .attach = intel_dsi_host_attach,
 207         .detach = intel_dsi_host_detach,
 208         .transfer = intel_dsi_host_transfer,
 209 };
 210
 211 /*
 212  * send a video mode command
 213  *
 214  * XXX: commands with data in MIPI_DPI_DATA?
 215  */
 216 static int dpi_send_cmd(struct intel_dsi *intel_dsi, u32 cmd, bool hs,
 217                         enum port port)
 218 {
 219         struct drm_encoder *encoder = &intel_dsi->base.base;
 220         struct drm_device *dev = encoder->dev;
 221         struct drm_i915_private *dev_priv = to_i915(dev);
 222         u32 mask;
 223
 224         /* XXX: pipe, hs */
 225         if (hs)
 226                 cmd &= ~DPI_LP_MODE;
 227         else
 228                 cmd |= DPI_LP_MODE;
 229
 230         /* clear bit */
 231         intel_de_write(dev_priv, MIPI_INTR_STAT(port), SPL_PKT_SENT_INTERRUPT);
 232
 233         /* XXX: old code skips write if control unchanged */
 234         if (cmd == intel_de_read(dev_priv, MIPI_DPI_CONTROL(port)))
 235                 drm_dbg_kms(&dev_priv->drm,
 236                             "Same special packet %02x twice in a row.\n", cmd);
 237
 238         intel_de_write(dev_priv, MIPI_DPI_CONTROL(port), cmd);
 239
 240         mask = SPL_PKT_SENT_INTERRUPT;
 241         if (intel_de_wait_for_set(dev_priv, MIPI_INTR_STAT(port), mask, 100))
 242                 drm_err(&dev_priv->drm,
 243                         "Video mode command 0x%08x send failed.\n", cmd);
 244
 245         return 0;
 246 }
 247
 248 static void band_gap_reset(struct drm_i915_private *dev_priv)
 249 {
 250         vlv_flisdsi_get(dev_priv);
 251
 252         vlv_flisdsi_write(dev_priv, 0x08, 0x0001);
 253         vlv_flisdsi_write(dev_priv, 0x0F, 0x0005);
 254         vlv_flisdsi_write(dev_priv, 0x0F, 0x0025);
 255         udelay(150);
 256         vlv_flisdsi_write(dev_priv, 0x0F, 0x0000);
 257         vlv_flisdsi_write(dev_priv, 0x08, 0x0000);
 258
 259         vlv_flisdsi_put(dev_priv);
 260 }
 261
 262 static int intel_dsi_compute_config(struct intel_encoder *encoder,
 263                                     struct intel_crtc_state *pipe_config,
 264                                     struct drm_connector_state *conn_state)
 265 {
 266         struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
 267         struct intel_dsi *intel_dsi = container_of(encoder, struct intel_dsi,
 268                                                    base);
 269         struct intel_connector *intel_connector = intel_dsi->attached_connector;
 270         const struct drm_display_mode *fixed_mode = intel_connector->panel.fixed_mode;
 271         struct drm_display_mode *adjusted_mode = &pipe_config->hw.adjusted_mode;
 272         int ret;
 273
 274         drm_dbg_kms(&dev_priv->drm, "\n");
 275         pipe_config->output_format = INTEL_OUTPUT_FORMAT_RGB;
 276
 277         if (fixed_mode) {
 278                 intel_fixed_panel_mode(fixed_mode, adjusted_mode);
 279
 280                 if (HAS_GMCH(dev_priv))
 281                         ret = intel_gmch_panel_fitting(pipe_config, conn_state);
 282                 else
 283                         ret = intel_pch_panel_fitting(pipe_config, conn_state);
 284                 if (ret)
 285                         return ret;
 286         }
 287
 288         if (adjusted_mode->flags & DRM_MODE_FLAG_DBLSCAN)
 289                 return -EINVAL;
 290
 291         /* DSI uses short packets for sync events, so clear mode flags for DSI */
 292         adjusted_mode->flags = 0;
 293
 294         if (intel_dsi->pixel_format == MIPI_DSI_FMT_RGB888)
 295                 pipe_config->pipe_bpp = 24;
 296         else
 297                 pipe_config->pipe_bpp = 18;
 298
 299         if (IS_GEN9_LP(dev_priv)) {
 300                 /* Enable Frame time stamp based scanline reporting */
 301                 pipe_config->mode_flags |=
 302                         I915_MODE_FLAG_GET_SCANLINE_FROM_TIMESTAMP;
 303
 304                 /* Dual link goes to DSI transcoder A. */
 305                 if (intel_dsi->ports == BIT(PORT_C))
 306                         pipe_config->cpu_transcoder = TRANSCODER_DSI_C;
 307                 else
 308                         pipe_config->cpu_transcoder = TRANSCODER_DSI_A;
 309
 310                 ret = bxt_dsi_pll_compute(encoder, pipe_config);
 311                 if (ret)
 312                         return -EINVAL;
 313         } else {
 314                 ret = vlv_dsi_pll_compute(encoder, pipe_config);
 315                 if (ret)
 316                         return -EINVAL;
 317         }
 318
 319         pipe_config->clock_set = true;
 320
 321         return 0;
 322 }
 323
 324 static bool glk_dsi_enable_io(struct intel_encoder *encoder)
 325 {
 326         struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
 327         struct intel_dsi *intel_dsi = enc_to_intel_dsi(encoder);
 328         enum port port;
 329         u32 tmp;
 330         bool cold_boot = false;
 331
 332         /* Set the MIPI mode
 333          * If MIPI_Mode is off, then writing to LP_Wake bit is not reflecting.
 334          * Power ON MIPI IO first and then write into IO reset and LP wake bits
 335          */
 336         for_each_dsi_port(port, intel_dsi->ports) {
 337                 tmp = intel_de_read(dev_priv, MIPI_CTRL(port));
 338                 intel_de_write(dev_priv, MIPI_CTRL(port),
 339                                tmp | GLK_MIPIIO_ENABLE);
 340         }
 341
 342         /* Put the IO into reset */
 343         tmp = intel_de_read(dev_priv, MIPI_CTRL(PORT_A));
 344         tmp &= ~GLK_MIPIIO_RESET_RELEASED;
 345         intel_de_write(dev_priv, MIPI_CTRL(PORT_A), tmp);
 346
 347         /* Program LP Wake */
 348         for_each_dsi_port(port, intel_dsi->ports) {
 349                 tmp = intel_de_read(dev_priv, MIPI_CTRL(port));
 350                 if (!(intel_de_read(dev_priv, MIPI_DEVICE_READY(port)) & DEVICE_READY))
 351                         tmp &= ~GLK_LP_WAKE;
 352                 else
 353                         tmp |= GLK_LP_WAKE;
 354                 intel_de_write(dev_priv, MIPI_CTRL(port), tmp);
 355         }
 356
 357         /* Wait for Pwr ACK */
 358         for_each_dsi_port(port, intel_dsi->ports) {
 359                 if (intel_de_wait_for_set(dev_priv, MIPI_CTRL(port),
 360                                           GLK_MIPIIO_PORT_POWERED, 20))
 361                         drm_err(&dev_priv->drm, "MIPIO port is powergated\n");
 362         }
 363
 364         /* Check for cold boot scenario */
 365         for_each_dsi_port(port, intel_dsi->ports) {
 366                 cold_boot |=
 367                         !(intel_de_read(dev_priv, MIPI_DEVICE_READY(port)) & DEVICE_READY);
 368         }
 369
 370         return cold_boot;
 371 }
 372
 373 static void glk_dsi_device_ready(struct intel_encoder *encoder)
 374 {
 375         struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
 376         struct intel_dsi *intel_dsi = enc_to_intel_dsi(encoder);
 377         enum port port;
 378         u32 val;
 379
 380         /* Wait for MIPI PHY status bit to set */
 381         for_each_dsi_port(port, intel_dsi->ports) {
 382                 if (intel_de_wait_for_set(dev_priv, MIPI_CTRL(port),
 383                                           GLK_PHY_STATUS_PORT_READY, 20))
 384                         drm_err(&dev_priv->drm, "PHY is not ON\n");
 385         }
 386
 387         /* Get IO out of reset */
 388         val = intel_de_read(dev_priv, MIPI_CTRL(PORT_A));
 389         intel_de_write(dev_priv, MIPI_CTRL(PORT_A),
 390                        val | GLK_MIPIIO_RESET_RELEASED);
 391
 392         /* Get IO out of Low power state*/
 393         for_each_dsi_port(port, intel_dsi->ports) {
 394                 if (!(intel_de_read(dev_priv, MIPI_DEVICE_READY(port)) & DEVICE_READY)) {
 395                         val = intel_de_read(dev_priv, MIPI_DEVICE_READY(port));
 396                         val &= ~ULPS_STATE_MASK;
 397                         val |= DEVICE_READY;
 398                         intel_de_write(dev_priv, MIPI_DEVICE_READY(port), val);
 399                         usleep_range(10, 15);
 400                 } else {
 401                         /* Enter ULPS */
 402                         val = intel_de_read(dev_priv, MIPI_DEVICE_READY(port));
 403                         val &= ~ULPS_STATE_MASK;
 404                         val |= (ULPS_STATE_ENTER | DEVICE_READY);
 405                         intel_de_write(dev_priv, MIPI_DEVICE_READY(port), val);
 406
 407                         /* Wait for ULPS active */
 408                         if (intel_de_wait_for_clear(dev_priv, MIPI_CTRL(port),
 409                                                     GLK_ULPS_NOT_ACTIVE, 20))
 410                                 drm_err(&dev_priv->drm, "ULPS not active\n");
 411
 412                         /* Exit ULPS */
 413                         val = intel_de_read(dev_priv, MIPI_DEVICE_READY(port));
 414                         val &= ~ULPS_STATE_MASK;
 415                         val |= (ULPS_STATE_EXIT | DEVICE_READY);
 416                         intel_de_write(dev_priv, MIPI_DEVICE_READY(port), val);
 417
 418                         /* Enter Normal Mode */
 419                         val = intel_de_read(dev_priv, MIPI_DEVICE_READY(port));
 420                         val &= ~ULPS_STATE_MASK;
 421                         val |= (ULPS_STATE_NORMAL_OPERATION | DEVICE_READY);
 422                         intel_de_write(dev_priv, MIPI_DEVICE_READY(port), val);
 423
 424                         val = intel_de_read(dev_priv, MIPI_CTRL(port));
 425                         val &= ~GLK_LP_WAKE;
 426                         intel_de_write(dev_priv, MIPI_CTRL(port), val);
 427                 }
 428         }
 429
 430         /* Wait for Stop state */
 431         for_each_dsi_port(port, intel_dsi->ports) {
 432                 if (intel_de_wait_for_set(dev_priv, MIPI_CTRL(port),
 433                                           GLK_DATA_LANE_STOP_STATE, 20))
 434                         drm_err(&dev_priv->drm,
 435                                 "Date lane not in STOP state\n");
 436         }
 437
 438         /* Wait for AFE LATCH */
 439         for_each_dsi_port(port, intel_dsi->ports) {
 440                 if (intel_de_wait_for_set(dev_priv, BXT_MIPI_PORT_CTRL(port),
 441                                           AFE_LATCHOUT, 20))
 442                         drm_err(&dev_priv->drm,
 443                                 "D-PHY not entering LP-11 state\n");
 444         }
 445 }
 446
 447 static void bxt_dsi_device_ready(struct intel_encoder *encoder)
 448 {
 449         struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
 450         struct intel_dsi *intel_dsi = enc_to_intel_dsi(encoder);
 451         enum port port;
 452         u32 val;
 453
 454         drm_dbg_kms(&dev_priv->drm, "\n");
 455
 456         /* Enable MIPI PHY transparent latch */
 457         for_each_dsi_port(port, intel_dsi->ports) {
 458                 val = intel_de_read(dev_priv, BXT_MIPI_PORT_CTRL(port));
 459                 intel_de_write(dev_priv, BXT_MIPI_PORT_CTRL(port),
 460                                val | LP_OUTPUT_HOLD);
 461                 usleep_range(2000, 2500);
 462         }
 463
 464         /* Clear ULPS and set device ready */
 465         for_each_dsi_port(port, intel_dsi->ports) {
 466                 val = intel_de_read(dev_priv, MIPI_DEVICE_READY(port));
 467                 val &= ~ULPS_STATE_MASK;
 468                 intel_de_write(dev_priv, MIPI_DEVICE_READY(port), val);
 469                 usleep_range(2000, 2500);
 470                 val |= DEVICE_READY;
 471                 intel_de_write(dev_priv, MIPI_DEVICE_READY(port), val);
 472         }
 473 }
 474
 475 static void vlv_dsi_device_ready(struct intel_encoder *encoder)
 476 {
 477         struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
 478         struct intel_dsi *intel_dsi = enc_to_intel_dsi(encoder);
 479         enum port port;
 480         u32 val;
 481
 482         drm_dbg_kms(&dev_priv->drm, "\n");
 483
 484         vlv_flisdsi_get(dev_priv);
 485         /* program rcomp for compliance, reduce from 50 ohms to 45 ohms
 486          * needed everytime after power gate */
 487         vlv_flisdsi_write(dev_priv, 0x04, 0x0004);
 488         vlv_flisdsi_put(dev_priv);
 489
 490         /* bandgap reset is needed after everytime we do power gate */
 491         band_gap_reset(dev_priv);
 492
 493         for_each_dsi_port(port, intel_dsi->ports) {
 494
 495                 intel_de_write(dev_priv, MIPI_DEVICE_READY(port),
 496                                ULPS_STATE_ENTER);
 497                 usleep_range(2500, 3000);
 498
 499                 /* Enable MIPI PHY transparent latch
 500                  * Common bit for both MIPI Port A & MIPI Port C
 501                  * No similar bit in MIPI Port C reg
 502                  */
 503                 val = intel_de_read(dev_priv, MIPI_PORT_CTRL(PORT_A));
 504                 intel_de_write(dev_priv, MIPI_PORT_CTRL(PORT_A),
 505                                val | LP_OUTPUT_HOLD);
 506                 usleep_range(1000, 1500);
 507
 508                 intel_de_write(dev_priv, MIPI_DEVICE_READY(port),
 509                                ULPS_STATE_EXIT);
 510                 usleep_range(2500, 3000);
 511
 512                 intel_de_write(dev_priv, MIPI_DEVICE_READY(port),
 513                                DEVICE_READY);
 514                 usleep_range(2500, 3000);
 515         }
 516 }
 517
 518 static void intel_dsi_device_ready(struct intel_encoder *encoder)
 519 {
 520         struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
 521
 522         if (IS_GEMINILAKE(dev_priv))
 523                 glk_dsi_device_ready(encoder);
 524         else if (IS_GEN9_LP(dev_priv))
 525                 bxt_dsi_device_ready(encoder);
 526         else
 527                 vlv_dsi_device_ready(encoder);
 528 }
 529
 530 static void glk_dsi_enter_low_power_mode(struct intel_encoder *encoder)
 531 {
 532         struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
 533         struct intel_dsi *intel_dsi = enc_to_intel_dsi(encoder);
 534         enum port port;
 535         u32 val;
 536
 537         /* Enter ULPS */
 538         for_each_dsi_port(port, intel_dsi->ports) {
 539                 val = intel_de_read(dev_priv, MIPI_DEVICE_READY(port));
 540                 val &= ~ULPS_STATE_MASK;
 541                 val |= (ULPS_STATE_ENTER | DEVICE_READY);
 542                 intel_de_write(dev_priv, MIPI_DEVICE_READY(port), val);
 543         }
 544
 545         /* Wait for MIPI PHY status bit to unset */
 546         for_each_dsi_port(port, intel_dsi->ports) {
 547                 if (intel_de_wait_for_clear(dev_priv, MIPI_CTRL(port),
 548                                             GLK_PHY_STATUS_PORT_READY, 20))
 549                         drm_err(&dev_priv->drm, "PHY is not turning OFF\n");
 550         }
 551
 552         /* Wait for Pwr ACK bit to unset */
 553         for_each_dsi_port(port, intel_dsi->ports) {
 554                 if (intel_de_wait_for_clear(dev_priv, MIPI_CTRL(port),
 555                                             GLK_MIPIIO_PORT_POWERED, 20))
 556                         drm_err(&dev_priv->drm,
 557                                 "MIPI IO Port is not powergated\n");
 558         }
 559 }
 560
 561 static void glk_dsi_disable_mipi_io(struct intel_encoder *encoder)
 562 {
 563         struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
 564         struct intel_dsi *intel_dsi = enc_to_intel_dsi(encoder);
 565         enum port port;
 566         u32 tmp;
 567
 568         /* Put the IO into reset */
 569         tmp = intel_de_read(dev_priv, MIPI_CTRL(PORT_A));
 570         tmp &= ~GLK_MIPIIO_RESET_RELEASED;
 571         intel_de_write(dev_priv, MIPI_CTRL(PORT_A), tmp);
 572
 573         /* Wait for MIPI PHY status bit to unset */
 574         for_each_dsi_port(port, intel_dsi->ports) {
 575                 if (intel_de_wait_for_clear(dev_priv, MIPI_CTRL(port),
 576                                             GLK_PHY_STATUS_PORT_READY, 20))
 577                         drm_err(&dev_priv->drm, "PHY is not turning OFF\n");
 578         }
 579
 580         /* Clear MIPI mode */
 581         for_each_dsi_port(port, intel_dsi->ports) {
 582                 tmp = intel_de_read(dev_priv, MIPI_CTRL(port));
 583                 tmp &= ~GLK_MIPIIO_ENABLE;
 584                 intel_de_write(dev_priv, MIPI_CTRL(port), tmp);
 585         }
 586 }
 587
 588 static void glk_dsi_clear_device_ready(struct intel_encoder *encoder)
 589 {
 590         glk_dsi_enter_low_power_mode(encoder);
 591         glk_dsi_disable_mipi_io(encoder);
 592 }
 593
 594 static void vlv_dsi_clear_device_ready(struct intel_encoder *encoder)
 595 {
 596         struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
 597         struct intel_dsi *intel_dsi = enc_to_intel_dsi(encoder);
 598         enum port port;
 599
 600         drm_dbg_kms(&dev_priv->drm, "\n");
 601         for_each_dsi_port(port, intel_dsi->ports) {
 602                 /* Common bit for both MIPI Port A & MIPI Port C on VLV/CHV */
 603                 i915_reg_t port_ctrl = IS_GEN9_LP(dev_priv) ?
 604                         BXT_MIPI_PORT_CTRL(port) : MIPI_PORT_CTRL(PORT_A);
 605                 u32 val;
 606
 607                 intel_de_write(dev_priv, MIPI_DEVICE_READY(port),
 608                                DEVICE_READY | ULPS_STATE_ENTER);
 609                 usleep_range(2000, 2500);
 610
 611                 intel_de_write(dev_priv, MIPI_DEVICE_READY(port),
 612                                DEVICE_READY | ULPS_STATE_EXIT);
 613                 usleep_range(2000, 2500);
 614
 615                 intel_de_write(dev_priv, MIPI_DEVICE_READY(port),
 616                                DEVICE_READY | ULPS_STATE_ENTER);
 617                 usleep_range(2000, 2500);
 618
 619                 /*
 620                  * On VLV/CHV, wait till Clock lanes are in LP-00 state for MIPI
 621                  * Port A only. MIPI Port C has no similar bit for checking.
 622                  */
 623                 if ((IS_GEN9_LP(dev_priv) || port == PORT_A) &&
 624                     intel_de_wait_for_clear(dev_priv, port_ctrl,
 625                                             AFE_LATCHOUT, 30))
 626                         drm_err(&dev_priv->drm, "DSI LP not going Low\n");
 627
 628                 /* Disable MIPI PHY transparent latch */
 629                 val = intel_de_read(dev_priv, port_ctrl);
 630                 intel_de_write(dev_priv, port_ctrl, val & ~LP_OUTPUT_HOLD);
 631                 usleep_range(1000, 1500);
 632
 633                 intel_de_write(dev_priv, MIPI_DEVICE_READY(port), 0x00);
 634                 usleep_range(2000, 2500);
 635         }
 636 }
 637
 638 static void intel_dsi_port_enable(struct intel_encoder *encoder,
 639                                   const struct intel_crtc_state *crtc_state)
 640 {
 641         struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
 642         struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
 643         struct intel_dsi *intel_dsi = enc_to_intel_dsi(encoder);
 644         enum port port;
 645
 646         if (intel_dsi->dual_link == DSI_DUAL_LINK_FRONT_BACK) {
 647                 u32 temp;
 648                 if (IS_GEN9_LP(dev_priv)) {
 649                         for_each_dsi_port(port, intel_dsi->ports) {
 650                                 temp = intel_de_read(dev_priv,
 651                                                      MIPI_CTRL(port));
 652                                 temp &= ~BXT_PIXEL_OVERLAP_CNT_MASK |
 653                                         intel_dsi->pixel_overlap <<
 654                                         BXT_PIXEL_OVERLAP_CNT_SHIFT;
 655                                 intel_de_write(dev_priv, MIPI_CTRL(port),
 656                                                temp);
 657                         }
 658                 } else {
 659                         temp = intel_de_read(dev_priv, VLV_CHICKEN_3);
 660                         temp &= ~PIXEL_OVERLAP_CNT_MASK |
 661                                         intel_dsi->pixel_overlap <<
 662                                         PIXEL_OVERLAP_CNT_SHIFT;
 663                         intel_de_write(dev_priv, VLV_CHICKEN_3, temp);
 664                 }
 665         }
 666
 667         for_each_dsi_port(port, intel_dsi->ports) {
 668                 i915_reg_t port_ctrl = IS_GEN9_LP(dev_priv) ?
 669                         BXT_MIPI_PORT_CTRL(port) : MIPI_PORT_CTRL(port);
 670                 u32 temp;
 671
 672                 temp = intel_de_read(dev_priv, port_ctrl);
 673
 674                 temp &= ~LANE_CONFIGURATION_MASK;
 675                 temp &= ~DUAL_LINK_MODE_MASK;
 676
 677                 if (intel_dsi->ports == (BIT(PORT_A) | BIT(PORT_C))) {
 678                         temp |= (intel_dsi->dual_link - 1)
 679                                                 << DUAL_LINK_MODE_SHIFT;
 680                         if (IS_BROXTON(dev_priv))
 681                                 temp |= LANE_CONFIGURATION_DUAL_LINK_A;
 682                         else
 683                                 temp |= crtc->pipe ?
 684                                         LANE_CONFIGURATION_DUAL_LINK_B :
 685                                         LANE_CONFIGURATION_DUAL_LINK_A;
 686                 }
 687
 688                 if (intel_dsi->pixel_format != MIPI_DSI_FMT_RGB888)
 689                         temp |= DITHERING_ENABLE;
 690
 691                 /* assert ip_tg_enable signal */
 692                 intel_de_write(dev_priv, port_ctrl, temp | DPI_ENABLE);
 693                 intel_de_posting_read(dev_priv, port_ctrl);
 694         }
 695 }
 696
 697 static void intel_dsi_port_disable(struct intel_encoder *encoder)
 698 {
 699         struct drm_device *dev = encoder->base.dev;
 700         struct drm_i915_private *dev_priv = to_i915(dev);
 701         struct intel_dsi *intel_dsi = enc_to_intel_dsi(encoder);
 702         enum port port;
 703
 704         for_each_dsi_port(port, intel_dsi->ports) {
 705                 i915_reg_t port_ctrl = IS_GEN9_LP(dev_priv) ?
 706                         BXT_MIPI_PORT_CTRL(port) : MIPI_PORT_CTRL(port);
 707                 u32 temp;
 708
 709                 /* de-assert ip_tg_enable signal */
 710                 temp = intel_de_read(dev_priv, port_ctrl);
 711                 intel_de_write(dev_priv, port_ctrl, temp & ~DPI_ENABLE);
 712                 intel_de_posting_read(dev_priv, port_ctrl);
 713         }
 714 }
 715
 716 static void intel_dsi_prepare(struct intel_encoder *intel_encoder,
 717                               const struct intel_crtc_state *pipe_config);
 718 static void intel_dsi_unprepare(struct intel_encoder *encoder);
 719
 720 /*
 721  * Panel enable/disable sequences from the VBT spec.
 722  *
 723  * Note the spec has AssertReset / DeassertReset swapped from their
 724  * usual naming. We use the normal names to avoid confusion (so below
 725  * they are swapped compared to the spec).
 726  *
 727  * Steps starting with MIPI refer to VBT sequences, note that for v2
 728  * VBTs several steps which have a VBT in v2 are expected to be handled
 729  * directly by the driver, by directly driving gpios for example.
 730  *
 731  * v2 video mode seq         v3 video mode seq         command mode seq
 732  * - power on                - MIPIPanelPowerOn        - power on
 733  * - wait t1+t2                                        - wait t1+t2
 734  * - MIPIDeassertResetPin    - MIPIDeassertResetPin    - MIPIDeassertResetPin
 735  * - io lines to lp-11       - io lines to lp-11       - io lines to lp-11
 736  * - MIPISendInitialDcsCmds  - MIPISendInitialDcsCmds  - MIPISendInitialDcsCmds
 737  *                                                     - MIPITearOn
 738  *                                                     - MIPIDisplayOn
 739  * - turn on DPI             - turn on DPI             - set pipe to dsr mode
 740  * - MIPIDisplayOn           - MIPIDisplayOn
 741  * - wait t5                                           - wait t5
 742  * - backlight on            - MIPIBacklightOn         - backlight on
 743  * ...                       ...                       ... issue mem cmds ...
 744  * - backlight off           - MIPIBacklightOff        - backlight off
 745  * - wait t6                                           - wait t6
 746  * - MIPIDisplayOff
 747  * - turn off DPI            - turn off DPI            - disable pipe dsr mode
 748  *                                                     - MIPITearOff
 749  *                           - MIPIDisplayOff          - MIPIDisplayOff
 750  * - io lines to lp-00       - io lines to lp-00       - io lines to lp-00
 751  * - MIPIAssertResetPin      - MIPIAssertResetPin      - MIPIAssertResetPin
 752  * - wait t3                                           - wait t3
 753  * - power off               - MIPIPanelPowerOff       - power off
 754  * - wait t4                                           - wait t4
 755  */
 756
 757 /*
 758  * DSI port enable has to be done before pipe and plane enable, so we do it in
 759  * the pre_enable hook instead of the enable hook.
 760  */
 761 static void intel_dsi_pre_enable(struct intel_atomic_state *state,
 762                                  struct intel_encoder *encoder,
 763                                  const struct intel_crtc_state *pipe_config,
 764                                  const struct drm_connector_state *conn_state)
 765 {
 766         struct intel_dsi *intel_dsi = enc_to_intel_dsi(encoder);
 767         struct drm_crtc *crtc = pipe_config->uapi.crtc;
 768         struct drm_i915_private *dev_priv = to_i915(crtc->dev);
 769         struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
 770         enum pipe pipe = intel_crtc->pipe;
 771         enum port port;
 772         u32 val;
 773         bool glk_cold_boot = false;
 774
 775         drm_dbg_kms(&dev_priv->drm, "\n");
 776
 777         intel_set_cpu_fifo_underrun_reporting(dev_priv, pipe, true);
 778
 779         /*
 780          * The BIOS may leave the PLL in a wonky state where it doesn't
 781          * lock. It needs to be fully powered down to fix it.
 782          */
 783         if (IS_GEN9_LP(dev_priv)) {
 784                 bxt_dsi_pll_disable(encoder);
 785                 bxt_dsi_pll_enable(encoder, pipe_config);
 786         } else {
 787                 vlv_dsi_pll_disable(encoder);
 788                 vlv_dsi_pll_enable(encoder, pipe_config);
 789         }
 790
 791         if (IS_BROXTON(dev_priv)) {
 792                 /* Add MIPI IO reset programming for modeset */
 793                 val = intel_de_read(dev_priv, BXT_P_CR_GT_DISP_PWRON);
 794                 intel_de_write(dev_priv, BXT_P_CR_GT_DISP_PWRON,
 795                                val | MIPIO_RST_CTRL);
 796
 797                 /* Power up DSI regulator */
 798                 intel_de_write(dev_priv, BXT_P_DSI_REGULATOR_CFG, STAP_SELECT);
 799                 intel_de_write(dev_priv, BXT_P_DSI_REGULATOR_TX_CTRL, 0);
 800         }
 801
 802         if (IS_VALLEYVIEW(dev_priv) || IS_CHERRYVIEW(dev_priv)) {
 803                 u32 val;
 804
 805                 /* Disable DPOunit clock gating, can stall pipe */
 806                 val = intel_de_read(dev_priv, DSPCLK_GATE_D);
 807                 val |= DPOUNIT_CLOCK_GATE_DISABLE;
 808                 intel_de_write(dev_priv, DSPCLK_GATE_D, val);
 809         }
 810
 811         if (!IS_GEMINILAKE(dev_priv))
 812                 intel_dsi_prepare(encoder, pipe_config);
 813
 814         intel_dsi_vbt_exec_sequence(intel_dsi, MIPI_SEQ_POWER_ON);
 815
 816         /*
 817          * Give the panel time to power-on and then deassert its reset.
 818          * Depending on the VBT MIPI sequences version the deassert-seq
 819          * may contain the necessary delay, intel_dsi_msleep() will skip
 820          * the delay in that case. If there is no deassert-seq, then an
 821          * unconditional msleep is used to give the panel time to power-on.
 822          */
 823         if (dev_priv->vbt.dsi.sequence[MIPI_SEQ_DEASSERT_RESET]) {
 824                 intel_dsi_msleep(intel_dsi, intel_dsi->panel_on_delay);
 825                 intel_dsi_vbt_exec_sequence(intel_dsi, MIPI_SEQ_DEASSERT_RESET);
 826         } else {
 827                 msleep(intel_dsi->panel_on_delay);
 828         }
 829
 830         if (IS_GEMINILAKE(dev_priv)) {
 831                 glk_cold_boot = glk_dsi_enable_io(encoder);
 832
 833                 /* Prepare port in cold boot(s3/s4) scenario */
 834                 if (glk_cold_boot)
 835                         intel_dsi_prepare(encoder, pipe_config);
 836         }
 837
 838         /* Put device in ready state (LP-11) */
 839         intel_dsi_device_ready(encoder);
 840
 841         /* Prepare port in normal boot scenario */
 842         if (IS_GEMINILAKE(dev_priv) && !glk_cold_boot)
 843                 intel_dsi_prepare(encoder, pipe_config);
 844
 845         /* Send initialization commands in LP mode */
 846         intel_dsi_vbt_exec_sequence(intel_dsi, MIPI_SEQ_INIT_OTP);
 847
 848         /* Enable port in pre-enable phase itself because as per hw team
 849          * recommendation, port should be enabled befor plane & pipe */
 850         if (is_cmd_mode(intel_dsi)) {
 851                 for_each_dsi_port(port, intel_dsi->ports)
 852                         intel_de_write(dev_priv,
 853                                        MIPI_MAX_RETURN_PKT_SIZE(port), 8 * 4);
 854                 intel_dsi_vbt_exec_sequence(intel_dsi, MIPI_SEQ_TEAR_ON);
 855                 intel_dsi_vbt_exec_sequence(intel_dsi, MIPI_SEQ_DISPLAY_ON);
 856         } else {
 857                 msleep(20); /* XXX */
 858                 for_each_dsi_port(port, intel_dsi->ports)
 859                         dpi_send_cmd(intel_dsi, TURN_ON, false, port);
 860                 intel_dsi_msleep(intel_dsi, 100);
 861
 862                 intel_dsi_vbt_exec_sequence(intel_dsi, MIPI_SEQ_DISPLAY_ON);
 863
 864                 intel_dsi_port_enable(encoder, pipe_config);
 865         }
 866
 867         intel_panel_enable_backlight(pipe_config, conn_state);
 868         intel_dsi_vbt_exec_sequence(intel_dsi, MIPI_SEQ_BACKLIGHT_ON);
 869 }
 870
 871 static void bxt_dsi_enable(struct intel_atomic_state *state,
 872                            struct intel_encoder *encoder,
 873                            const struct intel_crtc_state *crtc_state,
 874                            const struct drm_connector_state *conn_state)
 875 {
 876         drm_WARN_ON(state->base.dev, crtc_state->has_pch_encoder);
 877
 878         intel_crtc_vblank_on(crtc_state);
 879 }
 880
 881 /*
 882  * DSI port disable has to be done after pipe and plane disable, so we do it in
 883  * the post_disable hook.
 884  */
 885 static void intel_dsi_disable(struct intel_atomic_state *state,
 886                               struct intel_encoder *encoder,
 887                               const struct intel_crtc_state *old_crtc_state,
 888                               const struct drm_connector_state *old_conn_state)
 889 {
 890         struct drm_i915_private *i915 = to_i915(encoder->base.dev);
 891         struct intel_dsi *intel_dsi = enc_to_intel_dsi(encoder);
 892         enum port port;
 893
 894         drm_dbg_kms(&i915->drm, "\n");
 895
 896         intel_dsi_vbt_exec_sequence(intel_dsi, MIPI_SEQ_BACKLIGHT_OFF);
 897         intel_panel_disable_backlight(old_conn_state);
 898
 899         /*
 900          * According to the spec we should send SHUTDOWN before
 901          * MIPI_SEQ_DISPLAY_OFF only for v3+ VBTs, but field testing
 902          * has shown that the v3 sequence works for v2 VBTs too
 903          */
 904         if (is_vid_mode(intel_dsi)) {
 905                 /* Send Shutdown command to the panel in LP mode */
 906                 for_each_dsi_port(port, intel_dsi->ports)
 907                         dpi_send_cmd(intel_dsi, SHUTDOWN, false, port);
 908                 msleep(10);
 909         }
 910 }
 911
 912 static void intel_dsi_clear_device_ready(struct intel_encoder *encoder)
 913 {
 914         struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
 915
 916         if (IS_GEMINILAKE(dev_priv))
 917                 glk_dsi_clear_device_ready(encoder);
 918         else
 919                 vlv_dsi_clear_device_ready(encoder);
 920 }
 921
 922 static void intel_dsi_post_disable(struct intel_atomic_state *state,
 923                                    struct intel_encoder *encoder,
 924                                    const struct intel_crtc_state *old_crtc_state,
 925                                    const struct drm_connector_state *old_conn_state)
 926 {
 927         struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
 928         struct intel_dsi *intel_dsi = enc_to_intel_dsi(encoder);
 929         enum port port;
 930         u32 val;
 931
 932         drm_dbg_kms(&dev_priv->drm, "\n");
 933
 934         if (IS_GEN9_LP(dev_priv)) {
 935                 intel_crtc_vblank_off(old_crtc_state);
 936
 937                 skl_scaler_disable(old_crtc_state);
 938         }
 939
 940         if (is_vid_mode(intel_dsi)) {
 941                 for_each_dsi_port(port, intel_dsi->ports)
 942                         vlv_dsi_wait_for_fifo_empty(intel_dsi, port);
 943
 944                 intel_dsi_port_disable(encoder);
 945                 usleep_range(2000, 5000);
 946         }
 947
 948         intel_dsi_unprepare(encoder);
 949
 950         /*
 951          * if disable packets are sent before sending shutdown packet then in
 952          * some next enable sequence send turn on packet error is observed
 953          */
 954         if (is_cmd_mode(intel_dsi))
 955                 intel_dsi_vbt_exec_sequence(intel_dsi, MIPI_SEQ_TEAR_OFF);
 956         intel_dsi_vbt_exec_sequence(intel_dsi, MIPI_SEQ_DISPLAY_OFF);
 957
 958         /* Transition to LP-00 */
 959         intel_dsi_clear_device_ready(encoder);
 960
 961         if (IS_BROXTON(dev_priv)) {
 962                 /* Power down DSI regulator to save power */
 963                 intel_de_write(dev_priv, BXT_P_DSI_REGULATOR_CFG, STAP_SELECT);
 964                 intel_de_write(dev_priv, BXT_P_DSI_REGULATOR_TX_CTRL,
 965                                HS_IO_CTRL_SELECT);
 966
 967                 /* Add MIPI IO reset programming for modeset */
 968                 val = intel_de_read(dev_priv, BXT_P_CR_GT_DISP_PWRON);
 969                 intel_de_write(dev_priv, BXT_P_CR_GT_DISP_PWRON,
 970                                val & ~MIPIO_RST_CTRL);
 971         }
 972
 973         if (IS_GEN9_LP(dev_priv)) {
 974                 bxt_dsi_pll_disable(encoder);
 975         } else {
 976                 u32 val;
 977
 978                 vlv_dsi_pll_disable(encoder);
 979
 980                 val = intel_de_read(dev_priv, DSPCLK_GATE_D);
 981                 val &= ~DPOUNIT_CLOCK_GATE_DISABLE;
 982                 intel_de_write(dev_priv, DSPCLK_GATE_D, val);
 983         }
 984
 985         /* Assert reset */
 986         intel_dsi_vbt_exec_sequence(intel_dsi, MIPI_SEQ_ASSERT_RESET);
 987
 988         intel_dsi_msleep(intel_dsi, intel_dsi->panel_off_delay);
 989         intel_dsi_vbt_exec_sequence(intel_dsi, MIPI_SEQ_POWER_OFF);
 990
 991         /*
 992          * FIXME As we do with eDP, just make a note of the time here
 993          * and perform the wait before the next panel power on.
 994          */
 995         msleep(intel_dsi->panel_pwr_cycle_delay);
 996 }
 997
 998 static void intel_dsi_shutdown(struct intel_encoder *encoder)
 999 {
1000         struct intel_dsi *intel_dsi = enc_to_intel_dsi(encoder);
1001
1002         msleep(intel_dsi->panel_pwr_cycle_delay);
1003 }
1004
1005 static bool intel_dsi_get_hw_state(struct intel_encoder *encoder,
1006                                    enum pipe *pipe)
1007 {
1008         struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
1009         struct intel_dsi *intel_dsi = enc_to_intel_dsi(encoder);
1010         intel_wakeref_t wakeref;
1011         enum port port;
1012         bool active = false;
1013
1014         drm_dbg_kms(&dev_priv->drm, "\n");
1015
1016         wakeref = intel_display_power_get_if_enabled(dev_priv,
1017                                                      encoder->power_domain);
1018         if (!wakeref)
1019                 return false;
1020
1021         /*
1022          * On Broxton the PLL needs to be enabled with a valid divider
1023          * configuration, otherwise accessing DSI registers will hang the
1024          * machine. See BSpec North Display Engine registers/MIPI[BXT].
1025          */
1026         if (IS_GEN9_LP(dev_priv) && !bxt_dsi_pll_is_enabled(dev_priv))
1027                 goto out_put_power;
1028
1029         /* XXX: this only works for one DSI output */
1030         for_each_dsi_port(port, intel_dsi->ports) {
1031                 i915_reg_t ctrl_reg = IS_GEN9_LP(dev_priv) ?
1032                         BXT_MIPI_PORT_CTRL(port) : MIPI_PORT_CTRL(port);
1033                 bool enabled = intel_de_read(dev_priv, ctrl_reg) & DPI_ENABLE;
1034
1035                 /*
1036                  * Due to some hardware limitations on VLV/CHV, the DPI enable
1037                  * bit in port C control register does not get set. As a
1038                  * workaround, check pipe B conf instead.
1039                  */
1040                 if ((IS_VALLEYVIEW(dev_priv) || IS_CHERRYVIEW(dev_priv)) &&
1041                     port == PORT_C)
1042                         enabled = intel_de_read(dev_priv, PIPECONF(PIPE_B)) & PIPECONF_ENABLE;
1043
1044                 /* Try command mode if video mode not enabled */
1045                 if (!enabled) {
1046                         u32 tmp = intel_de_read(dev_priv,
1047                                                 MIPI_DSI_FUNC_PRG(port));
1048                         enabled = tmp & CMD_MODE_DATA_WIDTH_MASK;
1049                 }
1050
1051                 if (!enabled)
1052                         continue;
1053
1054                 if (!(intel_de_read(dev_priv, MIPI_DEVICE_READY(port)) & DEVICE_READY))
1055                         continue;
1056
1057                 if (IS_GEN9_LP(dev_priv)) {
1058                         u32 tmp = intel_de_read(dev_priv, MIPI_CTRL(port));
1059                         tmp &= BXT_PIPE_SELECT_MASK;
1060                         tmp >>= BXT_PIPE_SELECT_SHIFT;
1061
1062                         if (drm_WARN_ON(&dev_priv->drm, tmp > PIPE_C))
1063                                 continue;
1064
1065                         *pipe = tmp;
1066                 } else {
1067                         *pipe = port == PORT_A ? PIPE_A : PIPE_B;
1068                 }
1069
1070                 active = true;
1071                 break;
1072         }
1073
1074 out_put_power:
1075         intel_display_power_put(dev_priv, encoder->power_domain, wakeref);
1076
1077         return active;
1078 }
1079
1080 static void bxt_dsi_get_pipe_config(struct intel_encoder *encoder,
1081                                     struct intel_crtc_state *pipe_config)
1082 {
1083         struct drm_device *dev = encoder->base.dev;
1084         struct drm_i915_private *dev_priv = to_i915(dev);
1085         struct drm_display_mode *adjusted_mode =
1086                                         &pipe_config->hw.adjusted_mode;
1087         struct drm_display_mode *adjusted_mode_sw;
1088         struct intel_crtc *crtc = to_intel_crtc(pipe_config->uapi.crtc);
1089         struct intel_dsi *intel_dsi = enc_to_intel_dsi(encoder);
1090         unsigned int lane_count = intel_dsi->lane_count;
1091         unsigned int bpp, fmt;
1092         enum port port;
1093         u16 hactive, hfp, hsync, hbp, vfp, vsync, vbp;
1094         u16 hfp_sw, hsync_sw, hbp_sw;
1095         u16 crtc_htotal_sw, crtc_hsync_start_sw, crtc_hsync_end_sw,
1096                                 crtc_hblank_start_sw, crtc_hblank_end_sw;
1097
1098         /* FIXME: hw readout should not depend on SW state */
1099         adjusted_mode_sw = &crtc->config->hw.adjusted_mode;
1100
1101         /*
1102          * Atleast one port is active as encoder->get_config called only if
1103          * encoder->get_hw_state() returns true.
1104          */
1105         for_each_dsi_port(port, intel_dsi->ports) {
1106                 if (intel_de_read(dev_priv, BXT_MIPI_PORT_CTRL(port)) & DPI_ENABLE)
1107                         break;
1108         }
1109
1110         fmt = intel_de_read(dev_priv, MIPI_DSI_FUNC_PRG(port)) & VID_MODE_FORMAT_MASK;
1111         bpp = mipi_dsi_pixel_format_to_bpp(
1112                         pixel_format_from_register_bits(fmt));
1113
1114         pipe_config->pipe_bpp = bdw_get_pipemisc_bpp(crtc);
1115
1116         /* Enable Frame time stamo based scanline reporting */
1117         pipe_config->mode_flags |=
1118                 I915_MODE_FLAG_GET_SCANLINE_FROM_TIMESTAMP;
1119
1120         /* In terms of pixels */
1121         adjusted_mode->crtc_hdisplay =
1122                                 intel_de_read(dev_priv,
1123                                               BXT_MIPI_TRANS_HACTIVE(port));
1124         adjusted_mode->crtc_vdisplay =
1125                                 intel_de_read(dev_priv,
1126                                               BXT_MIPI_TRANS_VACTIVE(port));
1127         adjusted_mode->crtc_vtotal =
1128                                 intel_de_read(dev_priv,
1129                                               BXT_MIPI_TRANS_VTOTAL(port));
1130
1131         hactive = adjusted_mode->crtc_hdisplay;
1132         hfp = intel_de_read(dev_priv, MIPI_HFP_COUNT(port));
1133
1134         /*
1135          * Meaningful for video mode non-burst sync pulse mode only,
1136          * can be zero for non-burst sync events and burst modes
1137          */
1138         hsync = intel_de_read(dev_priv, MIPI_HSYNC_PADDING_COUNT(port));
1139         hbp = intel_de_read(dev_priv, MIPI_HBP_COUNT(port));
1140
1141         /* harizontal values are in terms of high speed byte clock */
1142         hfp = pixels_from_txbyteclkhs(hfp, bpp, lane_count,
1143                                                 intel_dsi->burst_mode_ratio);
1144         hsync = pixels_from_txbyteclkhs(hsync, bpp, lane_count,
1145                                                 intel_dsi->burst_mode_ratio);
1146         hbp = pixels_from_txbyteclkhs(hbp, bpp, lane_count,
1147                                                 intel_dsi->burst_mode_ratio);
1148
1149         if (intel_dsi->dual_link) {
1150                 hfp *= 2;
1151                 hsync *= 2;
1152                 hbp *= 2;
1153         }
1154
1155         /* vertical values are in terms of lines */
1156         vfp = intel_de_read(dev_priv, MIPI_VFP_COUNT(port));
1157         vsync = intel_de_read(dev_priv, MIPI_VSYNC_PADDING_COUNT(port));
1158         vbp = intel_de_read(dev_priv, MIPI_VBP_COUNT(port));
1159
1160         adjusted_mode->crtc_htotal = hactive + hfp + hsync + hbp;
1161         adjusted_mode->crtc_hsync_start = hfp + adjusted_mode->crtc_hdisplay;
1162         adjusted_mode->crtc_hsync_end = hsync + adjusted_mode->crtc_hsync_start;
1163         adjusted_mode->crtc_hblank_start = adjusted_mode->crtc_hdisplay;
1164         adjusted_mode->crtc_hblank_end = adjusted_mode->crtc_htotal;
1165
1166         adjusted_mode->crtc_vsync_start = vfp + adjusted_mode->crtc_vdisplay;
1167         adjusted_mode->crtc_vsync_end = vsync + adjusted_mode->crtc_vsync_start;
1168         adjusted_mode->crtc_vblank_start = adjusted_mode->crtc_vdisplay;
1169         adjusted_mode->crtc_vblank_end = adjusted_mode->crtc_vtotal;
1170
1171         /*
1172          * In BXT DSI there is no regs programmed with few horizontal timings
1173          * in Pixels but txbyteclkhs.. So retrieval process adds some
1174          * ROUND_UP ERRORS in the process of PIXELS<==>txbyteclkhs.
1175          * Actually here for the given adjusted_mode, we are calculating the
1176          * value programmed to the port and then back to the horizontal timing
1177          * param in pixels. This is the expected value, including roundup errors
1178          * And if that is same as retrieved value from port, then
1179          * (HW state) adjusted_mode's horizontal timings are corrected to
1180          * match with SW state to nullify the errors.
1181          */
1182         /* Calculating the value programmed to the Port register */
1183         hfp_sw = adjusted_mode_sw->crtc_hsync_start -
1184                                         adjusted_mode_sw->crtc_hdisplay;
1185         hsync_sw = adjusted_mode_sw->crtc_hsync_end -
1186                                         adjusted_mode_sw->crtc_hsync_start;
1187         hbp_sw = adjusted_mode_sw->crtc_htotal -
1188                                         adjusted_mode_sw->crtc_hsync_end;
1189
1190         if (intel_dsi->dual_link) {
1191                 hfp_sw /= 2;
1192                 hsync_sw /= 2;
1193                 hbp_sw /= 2;
1194         }
1195
1196         hfp_sw = txbyteclkhs(hfp_sw, bpp, lane_count,
1197                                                 intel_dsi->burst_mode_ratio);
1198         hsync_sw = txbyteclkhs(hsync_sw, bpp, lane_count,
1199                             intel_dsi->burst_mode_ratio);
1200         hbp_sw = txbyteclkhs(hbp_sw, bpp, lane_count,
1201                                                 intel_dsi->burst_mode_ratio);
1202
1203         /* Reverse calculating the adjusted mode parameters from port reg vals*/
1204         hfp_sw = pixels_from_txbyteclkhs(hfp_sw, bpp, lane_count,
1205                                                 intel_dsi->burst_mode_ratio);
1206         hsync_sw = pixels_from_txbyteclkhs(hsync_sw, bpp, lane_count,
1207                                                 intel_dsi->burst_mode_ratio);
1208         hbp_sw = pixels_from_txbyteclkhs(hbp_sw, bpp, lane_count,
1209                                                 intel_dsi->burst_mode_ratio);
1210
1211         if (intel_dsi->dual_link) {
1212                 hfp_sw *= 2;
1213                 hsync_sw *= 2;
1214                 hbp_sw *= 2;
1215         }
1216
1217         crtc_htotal_sw = adjusted_mode_sw->crtc_hdisplay + hfp_sw +
1218                                                         hsync_sw + hbp_sw;
1219         crtc_hsync_start_sw = hfp_sw + adjusted_mode_sw->crtc_hdisplay;
1220         crtc_hsync_end_sw = hsync_sw + crtc_hsync_start_sw;
1221         crtc_hblank_start_sw = adjusted_mode_sw->crtc_hdisplay;
1222         crtc_hblank_end_sw = crtc_htotal_sw;
1223
1224         if (adjusted_mode->crtc_htotal == crtc_htotal_sw)
1225                 adjusted_mode->crtc_htotal = adjusted_mode_sw->crtc_htotal;
1226
1227         if (adjusted_mode->crtc_hsync_start == crtc_hsync_start_sw)
1228                 adjusted_mode->crtc_hsync_start =
1229                                         adjusted_mode_sw->crtc_hsync_start;
1230
1231         if (adjusted_mode->crtc_hsync_end == crtc_hsync_end_sw)
1232                 adjusted_mode->crtc_hsync_end =
1233                                         adjusted_mode_sw->crtc_hsync_end;
1234
1235         if (adjusted_mode->crtc_hblank_start == crtc_hblank_start_sw)
1236                 adjusted_mode->crtc_hblank_start =
1237                                         adjusted_mode_sw->crtc_hblank_start;
1238
1239         if (adjusted_mode->crtc_hblank_end == crtc_hblank_end_sw)
1240                 adjusted_mode->crtc_hblank_end =
1241                                         adjusted_mode_sw->crtc_hblank_end;
1242 }
1243
1244 static void intel_dsi_get_config(struct intel_encoder *encoder,
1245                                  struct intel_crtc_state *pipe_config)
1246 {
1247         struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
1248         u32 pclk;
1249         drm_dbg_kms(&dev_priv->drm, "\n");
1250
1251         pipe_config->output_types |= BIT(INTEL_OUTPUT_DSI);
1252
1253         if (IS_GEN9_LP(dev_priv)) {
1254                 bxt_dsi_get_pipe_config(encoder, pipe_config);
1255                 pclk = bxt_dsi_get_pclk(encoder, pipe_config);
1256         } else {
1257                 pclk = vlv_dsi_get_pclk(encoder, pipe_config);
1258         }
1259
1260         if (pclk) {
1261                 pipe_config->hw.adjusted_mode.crtc_clock = pclk;
1262                 pipe_config->port_clock = pclk;
1263         }
1264 }
1265
1266 /* return txclkesc cycles in terms of divider and duration in us */
1267 static u16 txclkesc(u32 divider, unsigned int us)
1268 {
1269         switch (divider) {
1270         case ESCAPE_CLOCK_DIVIDER_1:
1271         default:
1272                 return 20 * us;
1273         case ESCAPE_CLOCK_DIVIDER_2:
1274                 return 10 * us;
1275         case ESCAPE_CLOCK_DIVIDER_4:
1276                 return 5 * us;
1277         }
1278 }
1279
1280 static void set_dsi_timings(struct drm_encoder *encoder,
1281                             const struct drm_display_mode *adjusted_mode)
1282 {
1283         struct drm_device *dev = encoder->dev;
1284         struct drm_i915_private *dev_priv = to_i915(dev);
1285         struct intel_dsi *intel_dsi = enc_to_intel_dsi(to_intel_encoder(encoder));
1286         enum port port;
1287         unsigned int bpp = mipi_dsi_pixel_format_to_bpp(intel_dsi->pixel_format);
1288         unsigned int lane_count = intel_dsi->lane_count;
1289
1290         u16 hactive, hfp, hsync, hbp, vfp, vsync, vbp;
1291
1292         hactive = adjusted_mode->crtc_hdisplay;
1293         hfp = adjusted_mode->crtc_hsync_start - adjusted_mode->crtc_hdisplay;
1294         hsync = adjusted_mode->crtc_hsync_end - adjusted_mode->crtc_hsync_start;
1295         hbp = adjusted_mode->crtc_htotal - adjusted_mode->crtc_hsync_end;
1296
1297         if (intel_dsi->dual_link) {
1298                 hactive /= 2;
1299                 if (intel_dsi->dual_link == DSI_DUAL_LINK_FRONT_BACK)
1300                         hactive += intel_dsi->pixel_overlap;
1301                 hfp /= 2;
1302                 hsync /= 2;
1303                 hbp /= 2;
1304         }
1305
1306         vfp = adjusted_mode->crtc_vsync_start - adjusted_mode->crtc_vdisplay;
1307         vsync = adjusted_mode->crtc_vsync_end - adjusted_mode->crtc_vsync_start;
1308         vbp = adjusted_mode->crtc_vtotal - adjusted_mode->crtc_vsync_end;
1309
1310         /* horizontal values are in terms of high speed byte clock */
1311         hactive = txbyteclkhs(hactive, bpp, lane_count,
1312                               intel_dsi->burst_mode_ratio);
1313         hfp = txbyteclkhs(hfp, bpp, lane_count, intel_dsi->burst_mode_ratio);
1314         hsync = txbyteclkhs(hsync, bpp, lane_count,
1315                             intel_dsi->burst_mode_ratio);
1316         hbp = txbyteclkhs(hbp, bpp, lane_count, intel_dsi->burst_mode_ratio);
1317
1318         for_each_dsi_port(port, intel_dsi->ports) {
1319                 if (IS_GEN9_LP(dev_priv)) {
1320                         /*
1321                          * Program hdisplay and vdisplay on MIPI transcoder.
1322                          * This is different from calculated hactive and
1323                          * vactive, as they are calculated per channel basis,
1324                          * whereas these values should be based on resolution.
1325                          */
1326                         intel_de_write(dev_priv, BXT_MIPI_TRANS_HACTIVE(port),
1327                                        adjusted_mode->crtc_hdisplay);
1328                         intel_de_write(dev_priv, BXT_MIPI_TRANS_VACTIVE(port),
1329                                        adjusted_mode->crtc_vdisplay);
1330                         intel_de_write(dev_priv, BXT_MIPI_TRANS_VTOTAL(port),
1331                                        adjusted_mode->crtc_vtotal);
1332                 }
1333
1334                 intel_de_write(dev_priv, MIPI_HACTIVE_AREA_COUNT(port),
1335                                hactive);
1336                 intel_de_write(dev_priv, MIPI_HFP_COUNT(port), hfp);
1337
1338                 /* meaningful for video mode non-burst sync pulse mode only,
1339                  * can be zero for non-burst sync events and burst modes */
1340                 intel_de_write(dev_priv, MIPI_HSYNC_PADDING_COUNT(port),
1341                                hsync);
1342                 intel_de_write(dev_priv, MIPI_HBP_COUNT(port), hbp);
1343
1344                 /* vertical values are in terms of lines */
1345                 intel_de_write(dev_priv, MIPI_VFP_COUNT(port), vfp);
1346                 intel_de_write(dev_priv, MIPI_VSYNC_PADDING_COUNT(port),
1347                                vsync);
1348                 intel_de_write(dev_priv, MIPI_VBP_COUNT(port), vbp);
1349         }
1350 }
1351
1352 static u32 pixel_format_to_reg(enum mipi_dsi_pixel_format fmt)
1353 {
1354         switch (fmt) {
1355         case MIPI_DSI_FMT_RGB888:
1356                 return VID_MODE_FORMAT_RGB888;
1357         case MIPI_DSI_FMT_RGB666:
1358                 return VID_MODE_FORMAT_RGB666;
1359         case MIPI_DSI_FMT_RGB666_PACKED:
1360                 return VID_MODE_FORMAT_RGB666_PACKED;
1361         case MIPI_DSI_FMT_RGB565:
1362                 return VID_MODE_FORMAT_RGB565;
1363         default:
1364                 MISSING_CASE(fmt);
1365                 return VID_MODE_FORMAT_RGB666;
1366         }
1367 }
1368
1369 static void intel_dsi_prepare(struct intel_encoder *intel_encoder,
1370                               const struct intel_crtc_state *pipe_config)
1371 {
1372         struct drm_encoder *encoder = &intel_encoder->base;
1373         struct drm_device *dev = encoder->dev;
1374         struct drm_i915_private *dev_priv = to_i915(dev);
1375         struct intel_crtc *intel_crtc = to_intel_crtc(pipe_config->uapi.crtc);
1376         struct intel_dsi *intel_dsi = enc_to_intel_dsi(to_intel_encoder(encoder));
1377         const struct drm_display_mode *adjusted_mode = &pipe_config->hw.adjusted_mode;
1378         enum port port;
1379         unsigned int bpp = mipi_dsi_pixel_format_to_bpp(intel_dsi->pixel_format);
1380         u32 val, tmp;
1381         u16 mode_hdisplay;
1382
1383         drm_dbg_kms(&dev_priv->drm, "pipe %c\n", pipe_name(intel_crtc->pipe));
1384
1385         mode_hdisplay = adjusted_mode->crtc_hdisplay;
1386
1387         if (intel_dsi->dual_link) {
1388                 mode_hdisplay /= 2;
1389                 if (intel_dsi->dual_link == DSI_DUAL_LINK_FRONT_BACK)
1390                         mode_hdisplay += intel_dsi->pixel_overlap;
1391         }
1392
1393         for_each_dsi_port(port, intel_dsi->ports) {
1394                 if (IS_VALLEYVIEW(dev_priv) || IS_CHERRYVIEW(dev_priv)) {
1395                         /*
1396                          * escape clock divider, 20MHz, shared for A and C.
1397                          * device ready must be off when doing this! txclkesc?
1398                          */
1399                         tmp = intel_de_read(dev_priv, MIPI_CTRL(PORT_A));
1400                         tmp &= ~ESCAPE_CLOCK_DIVIDER_MASK;
1401                         intel_de_write(dev_priv, MIPI_CTRL(PORT_A),
1402                                        tmp | ESCAPE_CLOCK_DIVIDER_1);
1403
1404                         /* read request priority is per pipe */
1405                         tmp = intel_de_read(dev_priv, MIPI_CTRL(port));
1406                         tmp &= ~READ_REQUEST_PRIORITY_MASK;
1407                         intel_de_write(dev_priv, MIPI_CTRL(port),
1408                                        tmp | READ_REQUEST_PRIORITY_HIGH);
1409                 } else if (IS_GEN9_LP(dev_priv)) {
1410                         enum pipe pipe = intel_crtc->pipe;
1411
1412                         tmp = intel_de_read(dev_priv, MIPI_CTRL(port));
1413                         tmp &= ~BXT_PIPE_SELECT_MASK;
1414
1415                         tmp |= BXT_PIPE_SELECT(pipe);
1416                         intel_de_write(dev_priv, MIPI_CTRL(port), tmp);
1417                 }
1418
1419                 /* XXX: why here, why like this? handling in irq handler?! */
1420                 intel_de_write(dev_priv, MIPI_INTR_STAT(port), 0xffffffff);
1421                 intel_de_write(dev_priv, MIPI_INTR_EN(port), 0xffffffff);
1422
1423                 intel_de_write(dev_priv, MIPI_DPHY_PARAM(port),
1424                                intel_dsi->dphy_reg);
1425
1426                 intel_de_write(dev_priv, MIPI_DPI_RESOLUTION(port),
1427                                adjusted_mode->crtc_vdisplay << VERTICAL_ADDRESS_SHIFT | mode_hdisplay << HORIZONTAL_ADDRESS_SHIFT);
1428         }
1429
1430         set_dsi_timings(encoder, adjusted_mode);
1431
1432         val = intel_dsi->lane_count << DATA_LANES_PRG_REG_SHIFT;
1433         if (is_cmd_mode(intel_dsi)) {
1434                 val |= intel_dsi->channel << CMD_MODE_CHANNEL_NUMBER_SHIFT;
1435                 val |= CMD_MODE_DATA_WIDTH_8_BIT; /* XXX */
1436         } else {
1437                 val |= intel_dsi->channel << VID_MODE_CHANNEL_NUMBER_SHIFT;
1438                 val |= pixel_format_to_reg(intel_dsi->pixel_format);
1439         }
1440
1441         tmp = 0;
1442         if (intel_dsi->eotp_pkt == 0)
1443                 tmp |= EOT_DISABLE;
1444         if (intel_dsi->clock_stop)
1445                 tmp |= CLOCKSTOP;
1446
1447         if (IS_GEN9_LP(dev_priv)) {
1448                 tmp |= BXT_DPHY_DEFEATURE_EN;
1449                 if (!is_cmd_mode(intel_dsi))
1450                         tmp |= BXT_DEFEATURE_DPI_FIFO_CTR;
1451         }
1452
1453         for_each_dsi_port(port, intel_dsi->ports) {
1454                 intel_de_write(dev_priv, MIPI_DSI_FUNC_PRG(port), val);
1455
1456                 /* timeouts for recovery. one frame IIUC. if counter expires,
1457                  * EOT and stop state. */
1458
1459                 /*
1460                  * In burst mode, value greater than one DPI line Time in byte
1461                  * clock (txbyteclkhs) To timeout this timer 1+ of the above
1462                  * said value is recommended.
1463                  *
1464                  * In non-burst mode, Value greater than one DPI frame time in
1465                  * byte clock(txbyteclkhs) To timeout this timer 1+ of the above
1466                  * said value is recommended.
1467                  *
1468                  * In DBI only mode, value greater than one DBI frame time in
1469                  * byte clock(txbyteclkhs) To timeout this timer 1+ of the above
1470                  * said value is recommended.
1471                  */
1472
1473                 if (is_vid_mode(intel_dsi) &&
1474                         intel_dsi->video_mode_format == VIDEO_MODE_BURST) {
1475                         intel_de_write(dev_priv, MIPI_HS_TX_TIMEOUT(port),
1476                                        txbyteclkhs(adjusted_mode->crtc_htotal, bpp, intel_dsi->lane_count, intel_dsi->burst_mode_ratio) + 1);
1477                 } else {
1478                         intel_de_write(dev_priv, MIPI_HS_TX_TIMEOUT(port),
1479                                        txbyteclkhs(adjusted_mode->crtc_vtotal * adjusted_mode->crtc_htotal, bpp, intel_dsi->lane_count, intel_dsi->burst_mode_ratio) + 1);
1480                 }
1481                 intel_de_write(dev_priv, MIPI_LP_RX_TIMEOUT(port),
1482                                intel_dsi->lp_rx_timeout);
1483                 intel_de_write(dev_priv, MIPI_TURN_AROUND_TIMEOUT(port),
1484                                intel_dsi->turn_arnd_val);
1485                 intel_de_write(dev_priv, MIPI_DEVICE_RESET_TIMER(port),
1486                                intel_dsi->rst_timer_val);
1487
1488                 /* dphy stuff */
1489
1490                 /* in terms of low power clock */
1491                 intel_de_write(dev_priv, MIPI_INIT_COUNT(port),
1492                                txclkesc(intel_dsi->escape_clk_div, 100));
1493
1494                 if (IS_GEN9_LP(dev_priv) && (!intel_dsi->dual_link)) {
1495                         /*
1496                          * BXT spec says write MIPI_INIT_COUNT for
1497                          * both the ports, even if only one is
1498                          * getting used. So write the other port
1499                          * if not in dual link mode.
1500                          */
1501                         intel_de_write(dev_priv,
1502                                        MIPI_INIT_COUNT(port == PORT_A ? PORT_C : PORT_A),
1503                                        intel_dsi->init_count);
1504                 }
1505
1506                 /* recovery disables */
1507                 intel_de_write(dev_priv, MIPI_EOT_DISABLE(port), tmp);
1508
1509                 /* in terms of low power clock */
1510                 intel_de_write(dev_priv, MIPI_INIT_COUNT(port),
1511                                intel_dsi->init_count);
1512
1513                 /* in terms of txbyteclkhs. actual high to low switch +
1514                  * MIPI_STOP_STATE_STALL * MIPI_LP_BYTECLK.
1515                  *
1516                  * XXX: write MIPI_STOP_STATE_STALL?
1517                  */
1518                 intel_de_write(dev_priv, MIPI_HIGH_LOW_SWITCH_COUNT(port),
1519                                intel_dsi->hs_to_lp_count);
1520
1521                 /* XXX: low power clock equivalence in terms of byte clock.
1522                  * the number of byte clocks occupied in one low power clock.
1523                  * based on txbyteclkhs and txclkesc.
1524                  * txclkesc time / txbyteclk time * (105 + MIPI_STOP_STATE_STALL
1525                  * ) / 105.???
1526                  */
1527                 intel_de_write(dev_priv, MIPI_LP_BYTECLK(port),
1528                                intel_dsi->lp_byte_clk);
1529
1530                 if (IS_GEMINILAKE(dev_priv)) {
1531                         intel_de_write(dev_priv, MIPI_TLPX_TIME_COUNT(port),
1532                                        intel_dsi->lp_byte_clk);
1533                         /* Shadow of DPHY reg */
1534                         intel_de_write(dev_priv, MIPI_CLK_LANE_TIMING(port),
1535                                        intel_dsi->dphy_reg);
1536                 }
1537
1538                 /* the bw essential for transmitting 16 long packets containing
1539                  * 252 bytes meant for dcs write memory command is programmed in
1540                  * this register in terms of byte clocks. based on dsi transfer
1541                  * rate and the number of lanes configured the time taken to
1542                  * transmit 16 long packets in a dsi stream varies. */
1543                 intel_de_write(dev_priv, MIPI_DBI_BW_CTRL(port),
1544                                intel_dsi->bw_timer);
1545
1546                 intel_de_write(dev_priv, MIPI_CLK_LANE_SWITCH_TIME_CNT(port),
1547                                intel_dsi->clk_lp_to_hs_count << LP_HS_SSW_CNT_SHIFT | intel_dsi->clk_hs_to_lp_count << HS_LP_PWR_SW_CNT_SHIFT);
1548
1549                 if (is_vid_mode(intel_dsi))
1550                         /* Some panels might have resolution which is not a
1551                          * multiple of 64 like 1366 x 768. Enable RANDOM
1552                          * resolution support for such panels by default */
1553                         intel_de_write(dev_priv, MIPI_VIDEO_MODE_FORMAT(port),
1554                                        intel_dsi->video_frmt_cfg_bits | intel_dsi->video_mode_format | IP_TG_CONFIG | RANDOM_DPI_DISPLAY_RESOLUTION);
1555         }
1556 }
1557
1558 static void intel_dsi_unprepare(struct intel_encoder *encoder)
1559 {
1560         struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
1561         struct intel_dsi *intel_dsi = enc_to_intel_dsi(encoder);
1562         enum port port;
1563         u32 val;
1564
1565         if (IS_GEMINILAKE(dev_priv))
1566                 return;
1567
1568         for_each_dsi_port(port, intel_dsi->ports) {
1569                 /* Panel commands can be sent when clock is in LP11 */
1570                 intel_de_write(dev_priv, MIPI_DEVICE_READY(port), 0x0);
1571
1572                 if (IS_GEN9_LP(dev_priv))
1573                         bxt_dsi_reset_clocks(encoder, port);
1574                 else
1575                         vlv_dsi_reset_clocks(encoder, port);
1576                 intel_de_write(dev_priv, MIPI_EOT_DISABLE(port), CLOCKSTOP);
1577
1578                 val = intel_de_read(dev_priv, MIPI_DSI_FUNC_PRG(port));
1579                 val &= ~VID_MODE_FORMAT_MASK;
1580                 intel_de_write(dev_priv, MIPI_DSI_FUNC_PRG(port), val);
1581
1582                 intel_de_write(dev_priv, MIPI_DEVICE_READY(port), 0x1);
1583         }
1584 }
1585
1586 static void intel_dsi_encoder_destroy(struct drm_encoder *encoder)
1587 {
1588         struct intel_dsi *intel_dsi = enc_to_intel_dsi(to_intel_encoder(encoder));
1589
1590         intel_dsi_vbt_gpio_cleanup(intel_dsi);
1591         intel_encoder_destroy(encoder);
1592 }
1593
1594 static const struct drm_encoder_funcs intel_dsi_funcs = {
1595         .destroy = intel_dsi_encoder_destroy,
1596 };
1597
1598 static const struct drm_connector_helper_funcs intel_dsi_connector_helper_funcs = {
1599         .get_modes = intel_dsi_get_modes,
1600         .mode_valid = intel_dsi_mode_valid,
1601         .atomic_check = intel_digital_connector_atomic_check,
1602 };
1603
1604 static const struct drm_connector_funcs intel_dsi_connector_funcs = {
1605         .detect = intel_panel_detect,
1606         .late_register = intel_connector_register,
1607         .early_unregister = intel_connector_unregister,
1608         .destroy = intel_connector_destroy,
1609         .fill_modes = drm_helper_probe_single_connector_modes,
1610         .atomic_get_property = intel_digital_connector_atomic_get_property,
1611         .atomic_set_property = intel_digital_connector_atomic_set_property,
1612         .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
1613         .atomic_duplicate_state = intel_digital_connector_duplicate_state,
1614 };
1615
1616 static void vlv_dsi_add_properties(struct intel_connector *connector)
1617 {
1618         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1619
1620         if (connector->panel.fixed_mode) {
1621                 u32 allowed_scalers;
1622
1623                 allowed_scalers = BIT(DRM_MODE_SCALE_ASPECT) | BIT(DRM_MODE_SCALE_FULLSCREEN);
1624                 if (!HAS_GMCH(dev_priv))
1625                         allowed_scalers |= BIT(DRM_MODE_SCALE_CENTER);
1626
1627                 drm_connector_attach_scaling_mode_property(&connector->base,
1628                                                                 allowed_scalers);
1629
1630                 connector->base.state->scaling_mode = DRM_MODE_SCALE_ASPECT;
1631
1632                 drm_connector_set_panel_orientation_with_quirk(
1633                                 &connector->base,
1634                                 intel_dsi_get_panel_orientation(connector),
1635                                 connector->panel.fixed_mode->hdisplay,
1636                                 connector->panel.fixed_mode->vdisplay);
1637         }
1638 }
1639
1640 #define NS_KHZ_RATIO            1000000
1641
1642 #define PREPARE_CNT_MAX         0x3F
1643 #define EXIT_ZERO_CNT_MAX       0x3F
1644 #define CLK_ZERO_CNT_MAX        0xFF
1645 #define TRAIL_CNT_MAX           0x1F
1646
1647 static void vlv_dphy_param_init(struct intel_dsi *intel_dsi)
1648 {
1649         struct drm_device *dev = intel_dsi->base.base.dev;
1650         struct drm_i915_private *dev_priv = to_i915(dev);
1651         struct mipi_config *mipi_config = dev_priv->vbt.dsi.config;
1652         u32 tlpx_ns, extra_byte_count, tlpx_ui;
1653         u32 ui_num, ui_den;
1654         u32 prepare_cnt, exit_zero_cnt, clk_zero_cnt, trail_cnt;
1655         u32 ths_prepare_ns, tclk_trail_ns;
1656         u32 tclk_prepare_clkzero, ths_prepare_hszero;
1657         u32 lp_to_hs_switch, hs_to_lp_switch;
1658         u32 mul;
1659
1660         tlpx_ns = intel_dsi_tlpx_ns(intel_dsi);
1661
1662         switch (intel_dsi->lane_count) {
1663         case 1:
1664         case 2:
1665                 extra_byte_count = 2;
1666                 break;
1667         case 3:
1668                 extra_byte_count = 4;
1669                 break;
1670         case 4:
1671         default:
1672                 extra_byte_count = 3;
1673                 break;
1674         }
1675
1676         /* in Kbps */
1677         ui_num = NS_KHZ_RATIO;
1678         ui_den = intel_dsi_bitrate(intel_dsi);
1679
1680         tclk_prepare_clkzero = mipi_config->tclk_prepare_clkzero;
1681         ths_prepare_hszero = mipi_config->ths_prepare_hszero;
1682
1683         /*
1684          * B060
1685          * LP byte clock = TLPX/ (8UI)
1686          */
1687         intel_dsi->lp_byte_clk = DIV_ROUND_UP(tlpx_ns * ui_den, 8 * ui_num);
1688
1689         /* DDR clock period = 2 * UI
1690          * UI(sec) = 1/(bitrate * 10^3) (bitrate is in KHZ)
1691          * UI(nsec) = 10^6 / bitrate
1692          * DDR clock period (nsec) = 2 * UI = (2 * 10^6)/ bitrate
1693          * DDR clock count  = ns_value / DDR clock period
1694          *
1695          * For GEMINILAKE dphy_param_reg will be programmed in terms of
1696          * HS byte clock count for other platform in HS ddr clock count
1697          */
1698         mul = IS_GEMINILAKE(dev_priv) ? 8 : 2;
1699         ths_prepare_ns = max(mipi_config->ths_prepare,
1700                              mipi_config->tclk_prepare);
1701
1702         /* prepare count */
1703         prepare_cnt = DIV_ROUND_UP(ths_prepare_ns * ui_den, ui_num * mul);
1704
1705         if (prepare_cnt > PREPARE_CNT_MAX) {
1706                 drm_dbg_kms(&dev_priv->drm, "prepare count too high %u\n",
1707                             prepare_cnt);
1708                 prepare_cnt = PREPARE_CNT_MAX;
1709         }
1710
1711         /* exit zero count */
1712         exit_zero_cnt = DIV_ROUND_UP(
1713                                 (ths_prepare_hszero - ths_prepare_ns) * ui_den,
1714                                 ui_num * mul
1715                                 );
1716
1717         /*
1718          * Exit zero is unified val ths_zero and ths_exit
1719          * minimum value for ths_exit = 110ns
1720          * min (exit_zero_cnt * 2) = 110/UI
1721          * exit_zero_cnt = 55/UI
1722          */
1723         if (exit_zero_cnt < (55 * ui_den / ui_num) && (55 * ui_den) % ui_num)
1724                 exit_zero_cnt += 1;
1725
1726         if (exit_zero_cnt > EXIT_ZERO_CNT_MAX) {
1727                 drm_dbg_kms(&dev_priv->drm, "exit zero count too high %u\n",
1728                             exit_zero_cnt);
1729                 exit_zero_cnt = EXIT_ZERO_CNT_MAX;
1730         }
1731
1732         /* clk zero count */
1733         clk_zero_cnt = DIV_ROUND_UP(
1734                                 (tclk_prepare_clkzero - ths_prepare_ns)
1735                                 * ui_den, ui_num * mul);
1736
1737         if (clk_zero_cnt > CLK_ZERO_CNT_MAX) {
1738                 drm_dbg_kms(&dev_priv->drm, "clock zero count too high %u\n",
1739                             clk_zero_cnt);
1740                 clk_zero_cnt = CLK_ZERO_CNT_MAX;
1741         }
1742
1743         /* trail count */
1744         tclk_trail_ns = max(mipi_config->tclk_trail, mipi_config->ths_trail);
1745         trail_cnt = DIV_ROUND_UP(tclk_trail_ns * ui_den, ui_num * mul);
1746
1747         if (trail_cnt > TRAIL_CNT_MAX) {
1748                 drm_dbg_kms(&dev_priv->drm, "trail count too high %u\n",
1749                             trail_cnt);
1750                 trail_cnt = TRAIL_CNT_MAX;
1751         }
1752
1753         /* B080 */
1754         intel_dsi->dphy_reg = exit_zero_cnt << 24 | trail_cnt << 16 |
1755                                                 clk_zero_cnt << 8 | prepare_cnt;
1756
1757         /*
1758          * LP to HS switch count = 4TLPX + PREP_COUNT * mul + EXIT_ZERO_COUNT *
1759          *                                      mul + 10UI + Extra Byte Count
1760          *
1761          * HS to LP switch count = THS-TRAIL + 2TLPX + Extra Byte Count
1762          * Extra Byte Count is calculated according to number of lanes.
1763          * High Low Switch Count is the Max of LP to HS and
1764          * HS to LP switch count
1765          *
1766          */
1767         tlpx_ui = DIV_ROUND_UP(tlpx_ns * ui_den, ui_num);
1768
1769         /* B044 */
1770         /* FIXME:
1771          * The comment above does not match with the code */
1772         lp_to_hs_switch = DIV_ROUND_UP(4 * tlpx_ui + prepare_cnt * mul +
1773                                                 exit_zero_cnt * mul + 10, 8);
1774
1775         hs_to_lp_switch = DIV_ROUND_UP(mipi_config->ths_trail + 2 * tlpx_ui, 8);
1776
1777         intel_dsi->hs_to_lp_count = max(lp_to_hs_switch, hs_to_lp_switch);
1778         intel_dsi->hs_to_lp_count += extra_byte_count;
1779
1780         /* B088 */
1781         /* LP -> HS for clock lanes
1782          * LP clk sync + LP11 + LP01 + tclk_prepare + tclk_zero +
1783          *                                              extra byte count
1784          * 2TPLX + 1TLPX + 1 TPLX(in ns) + prepare_cnt * 2 + clk_zero_cnt *
1785          *                                      2(in UI) + extra byte count
1786          * In byteclks = (4TLPX + prepare_cnt * 2 + clk_zero_cnt *2 (in UI)) /
1787          *                                      8 + extra byte count
1788          */
1789         intel_dsi->clk_lp_to_hs_count =
1790                 DIV_ROUND_UP(
1791                         4 * tlpx_ui + prepare_cnt * 2 +
1792                         clk_zero_cnt * 2,
1793                         8);
1794
1795         intel_dsi->clk_lp_to_hs_count += extra_byte_count;
1796
1797         /* HS->LP for Clock Lanes
1798          * Low Power clock synchronisations + 1Tx byteclk + tclk_trail +
1799          *                                              Extra byte count
1800          * 2TLPX + 8UI + (trail_count*2)(in UI) + Extra byte count
1801          * In byteclks = (2*TLpx(in UI) + trail_count*2 +8)(in UI)/8 +
1802          *                                              Extra byte count
1803          */
1804         intel_dsi->clk_hs_to_lp_count =
1805                 DIV_ROUND_UP(2 * tlpx_ui + trail_cnt * 2 + 8,
1806                         8);
1807         intel_dsi->clk_hs_to_lp_count += extra_byte_count;
1808
1809         intel_dsi_log_params(intel_dsi);
1810 }
1811
1812 void vlv_dsi_init(struct drm_i915_private *dev_priv)
1813 {
1814         struct drm_device *dev = &dev_priv->drm;
1815         struct intel_dsi *intel_dsi;
1816         struct intel_encoder *intel_encoder;
1817         struct drm_encoder *encoder;
1818         struct intel_connector *intel_connector;
1819         struct drm_connector *connector;
1820         struct drm_display_mode *current_mode, *fixed_mode;
1821         enum port port;
1822         enum pipe pipe;
1823
1824         drm_dbg_kms(&dev_priv->drm, "\n");
1825
1826         /* There is no detection method for MIPI so rely on VBT */
1827         if (!intel_bios_is_dsi_present(dev_priv, &port))
1828                 return;
1829
1830         if (IS_GEN9_LP(dev_priv))
1831                 dev_priv->mipi_mmio_base = BXT_MIPI_BASE;
1832         else
1833                 dev_priv->mipi_mmio_base = VLV_MIPI_BASE;
1834
1835         intel_dsi = kzalloc(sizeof(*intel_dsi), GFP_KERNEL);
1836         if (!intel_dsi)
1837                 return;
1838
1839         intel_connector = intel_connector_alloc();
1840         if (!intel_connector) {
1841                 kfree(intel_dsi);
1842                 return;
1843         }
1844
1845         intel_encoder = &intel_dsi->base;
1846         encoder = &intel_encoder->base;
1847         intel_dsi->attached_connector = intel_connector;
1848
1849         connector = &intel_connector->base;
1850
1851         drm_encoder_init(dev, encoder, &intel_dsi_funcs, DRM_MODE_ENCODER_DSI,
1852                          "DSI %c", port_name(port));
1853
1854         intel_encoder->compute_config = intel_dsi_compute_config;
1855         intel_encoder->pre_enable = intel_dsi_pre_enable;
1856         if (IS_GEN9_LP(dev_priv))
1857                 intel_encoder->enable = bxt_dsi_enable;
1858         intel_encoder->disable = intel_dsi_disable;
1859         intel_encoder->post_disable = intel_dsi_post_disable;
1860         intel_encoder->get_hw_state = intel_dsi_get_hw_state;
1861         intel_encoder->get_config = intel_dsi_get_config;
1862         intel_encoder->update_pipe = intel_panel_update_backlight;
1863         intel_encoder->shutdown = intel_dsi_shutdown;
1864
1865         intel_connector->get_hw_state = intel_connector_get_hw_state;
1866
1867         intel_encoder->port = port;
1868         intel_encoder->type = INTEL_OUTPUT_DSI;
1869         intel_encoder->power_domain = POWER_DOMAIN_PORT_DSI;
1870         intel_encoder->cloneable = 0;
1871
1872         /*
1873          * On BYT/CHV, pipe A maps to MIPI DSI port A, pipe B maps to MIPI DSI
1874          * port C. BXT isn't limited like this.
1875          */
1876         if (IS_GEN9_LP(dev_priv))
1877                 intel_encoder->pipe_mask = ~0;
1878         else if (port == PORT_A)
1879                 intel_encoder->pipe_mask = BIT(PIPE_A);
1880         else
1881                 intel_encoder->pipe_mask = BIT(PIPE_B);
1882
1883         if (dev_priv->vbt.dsi.config->dual_link)
1884                 intel_dsi->ports = BIT(PORT_A) | BIT(PORT_C);
1885         else
1886                 intel_dsi->ports = BIT(port);
1887
1888         intel_dsi->dcs_backlight_ports = dev_priv->vbt.dsi.bl_ports;
1889         intel_dsi->dcs_cabc_ports = dev_priv->vbt.dsi.cabc_ports;
1890
1891         /* Create a DSI host (and a device) for each port. */
1892         for_each_dsi_port(port, intel_dsi->ports) {
1893                 struct intel_dsi_host *host;
1894
1895                 host = intel_dsi_host_init(intel_dsi, &intel_dsi_host_ops,
1896                                            port);
1897                 if (!host)
1898                         goto err;
1899
1900                 intel_dsi->dsi_hosts[port] = host;
1901         }
1902
1903         if (!intel_dsi_vbt_init(intel_dsi, MIPI_DSI_GENERIC_PANEL_ID)) {
1904                 drm_dbg_kms(&dev_priv->drm, "no device found\n");
1905                 goto err;
1906         }
1907
1908         /* Use clock read-back from current hw-state for fastboot */
1909         current_mode = intel_encoder_current_mode(intel_encoder);
1910         if (current_mode) {
1911                 drm_dbg_kms(&dev_priv->drm, "Calculated pclk %d GOP %d\n",
1912                             intel_dsi->pclk, current_mode->clock);
1913                 if (intel_fuzzy_clock_check(intel_dsi->pclk,
1914                                             current_mode->clock)) {
1915                         drm_dbg_kms(&dev_priv->drm, "Using GOP pclk\n");
1916                         intel_dsi->pclk = current_mode->clock;
1917                 }
1918
1919                 kfree(current_mode);
1920         }
1921
1922         vlv_dphy_param_init(intel_dsi);
1923
1924         intel_dsi_vbt_gpio_init(intel_dsi,
1925                                 intel_dsi_get_hw_state(intel_encoder, &pipe));
1926
1927         drm_connector_init(dev, connector, &intel_dsi_connector_funcs,
1928                            DRM_MODE_CONNECTOR_DSI);
1929
1930         drm_connector_helper_add(connector, &intel_dsi_connector_helper_funcs);
1931
1932         connector->display_info.subpixel_order = SubPixelHorizontalRGB; /*XXX*/
1933         connector->interlace_allowed = false;
1934         connector->doublescan_allowed = false;
1935
1936         intel_connector_attach_encoder(intel_connector, intel_encoder);
1937
1938         mutex_lock(&dev->mode_config.mutex);
1939         fixed_mode = intel_panel_vbt_fixed_mode(intel_connector);
1940         mutex_unlock(&dev->mode_config.mutex);
1941
1942         if (!fixed_mode) {
1943                 drm_dbg_kms(&dev_priv->drm, "no fixed mode\n");
1944                 goto err_cleanup_connector;
1945         }
1946
1947         intel_panel_init(&intel_connector->panel, fixed_mode, NULL);
1948         intel_panel_setup_backlight(connector, INVALID_PIPE);
1949
1950         vlv_dsi_add_properties(intel_connector);
1951
1952         return;
1953
1954 err_cleanup_connector:
1955         drm_connector_cleanup(&intel_connector->base);
1956 err:
1957         drm_encoder_cleanup(&intel_encoder->base);
1958         kfree(intel_dsi);
1959         kfree(intel_connector);
1960 }