drivers/gpu/drm/i915/intel_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 <drm/drmP.h>
  27 #include <drm/drm_atomic_helper.h>
  28 #include <drm/drm_crtc.h>
  29 #include <drm/drm_edid.h>
  30 #include <drm/i915_drm.h>
  31 #include <drm/drm_mipi_dsi.h>
  32 #include <linux/slab.h>
  33 #include <linux/gpio/consumer.h>
  34 #include "i915_drv.h"
  35 #include "intel_drv.h"
  36 #include "intel_dsi.h"
  37
  38 /* return pixels in terms of txbyteclkhs */
  39 static u16 txbyteclkhs(u16 pixels, int bpp, int lane_count,
  40                        u16 burst_mode_ratio)
  41 {
  42         return DIV_ROUND_UP(DIV_ROUND_UP(pixels * bpp * burst_mode_ratio,
  43                                          8 * 100), lane_count);
  44 }
  45
  46 /* return pixels equvalent to txbyteclkhs */
  47 static u16 pixels_from_txbyteclkhs(u16 clk_hs, int bpp, int lane_count,
  48                         u16 burst_mode_ratio)
  49 {
  50         return DIV_ROUND_UP((clk_hs * lane_count * 8 * 100),
  51                                                 (bpp * burst_mode_ratio));
  52 }
  53
  54 enum mipi_dsi_pixel_format pixel_format_from_register_bits(u32 fmt)
  55 {
  56         /* It just so happens the VBT matches register contents. */
  57         switch (fmt) {
  58         case VID_MODE_FORMAT_RGB888:
  59                 return MIPI_DSI_FMT_RGB888;
  60         case VID_MODE_FORMAT_RGB666:
  61                 return MIPI_DSI_FMT_RGB666;
  62         case VID_MODE_FORMAT_RGB666_PACKED:
  63                 return MIPI_DSI_FMT_RGB666_PACKED;
  64         case VID_MODE_FORMAT_RGB565:
  65                 return MIPI_DSI_FMT_RGB565;
  66         default:
  67                 MISSING_CASE(fmt);
  68                 return MIPI_DSI_FMT_RGB666;
  69         }
  70 }
  71
  72 void wait_for_dsi_fifo_empty(struct intel_dsi *intel_dsi, enum port port)
  73 {
  74         struct drm_encoder *encoder = &intel_dsi->base.base;
  75         struct drm_device *dev = encoder->dev;
  76         struct drm_i915_private *dev_priv = to_i915(dev);
  77         u32 mask;
  78
  79         mask = LP_CTRL_FIFO_EMPTY | HS_CTRL_FIFO_EMPTY |
  80                 LP_DATA_FIFO_EMPTY | HS_DATA_FIFO_EMPTY;
  81
  82         if (intel_wait_for_register(dev_priv,
  83                                     MIPI_GEN_FIFO_STAT(port), mask, mask,
  84                                     100))
  85                 DRM_ERROR("DPI FIFOs are not empty\n");
  86 }
  87
  88 static void write_data(struct drm_i915_private *dev_priv,
  89                        i915_reg_t reg,
  90                        const u8 *data, u32 len)
  91 {
  92         u32 i, j;
  93
  94         for (i = 0; i < len; i += 4) {
  95                 u32 val = 0;
  96
  97                 for (j = 0; j < min_t(u32, len - i, 4); j++)
  98                         val |= *data++ << 8 * j;
  99
 100                 I915_WRITE(reg, val);
 101         }
 102 }
 103
 104 static void read_data(struct drm_i915_private *dev_priv,
 105                       i915_reg_t reg,
 106                       u8 *data, u32 len)
 107 {
 108         u32 i, j;
 109
 110         for (i = 0; i < len; i += 4) {
 111                 u32 val = I915_READ(reg);
 112
 113                 for (j = 0; j < min_t(u32, len - i, 4); j++)
 114                         *data++ = val >> 8 * j;
 115         }
 116 }
 117
 118 static ssize_t intel_dsi_host_transfer(struct mipi_dsi_host *host,
 119                                        const struct mipi_dsi_msg *msg)
 120 {
 121         struct intel_dsi_host *intel_dsi_host = to_intel_dsi_host(host);
 122         struct drm_device *dev = intel_dsi_host->intel_dsi->base.base.dev;
 123         struct drm_i915_private *dev_priv = to_i915(dev);
 124         enum port port = intel_dsi_host->port;
 125         struct mipi_dsi_packet packet;
 126         ssize_t ret;
 127         const u8 *header, *data;
 128         i915_reg_t data_reg, ctrl_reg;
 129         u32 data_mask, ctrl_mask;
 130
 131         ret = mipi_dsi_create_packet(&packet, msg);
 132         if (ret < 0)
 133                 return ret;
 134
 135         header = packet.header;
 136         data = packet.payload;
 137
 138         if (msg->flags & MIPI_DSI_MSG_USE_LPM) {
 139                 data_reg = MIPI_LP_GEN_DATA(port);
 140                 data_mask = LP_DATA_FIFO_FULL;
 141                 ctrl_reg = MIPI_LP_GEN_CTRL(port);
 142                 ctrl_mask = LP_CTRL_FIFO_FULL;
 143         } else {
 144                 data_reg = MIPI_HS_GEN_DATA(port);
 145                 data_mask = HS_DATA_FIFO_FULL;
 146                 ctrl_reg = MIPI_HS_GEN_CTRL(port);
 147                 ctrl_mask = HS_CTRL_FIFO_FULL;
 148         }
 149
 150         /* note: this is never true for reads */
 151         if (packet.payload_length) {
 152                 if (intel_wait_for_register(dev_priv,
 153                                             MIPI_GEN_FIFO_STAT(port),
 154                                             data_mask, 0,
 155                                             50))
 156                         DRM_ERROR("Timeout waiting for HS/LP DATA FIFO !full\n");
 157
 158                 write_data(dev_priv, data_reg, packet.payload,
 159                            packet.payload_length);
 160         }
 161
 162         if (msg->rx_len) {
 163                 I915_WRITE(MIPI_INTR_STAT(port), GEN_READ_DATA_AVAIL);
 164         }
 165
 166         if (intel_wait_for_register(dev_priv,
 167                                     MIPI_GEN_FIFO_STAT(port),
 168                                     ctrl_mask, 0,
 169                                     50)) {
 170                 DRM_ERROR("Timeout waiting for HS/LP CTRL FIFO !full\n");
 171         }
 172
 173         I915_WRITE(ctrl_reg, header[2] << 16 | header[1] << 8 | header[0]);
 174
 175         /* ->rx_len is set only for reads */
 176         if (msg->rx_len) {
 177                 data_mask = GEN_READ_DATA_AVAIL;
 178                 if (intel_wait_for_register(dev_priv,
 179                                             MIPI_INTR_STAT(port),
 180                                             data_mask, data_mask,
 181                                             50))
 182                         DRM_ERROR("Timeout waiting for read data.\n");
 183
 184                 read_data(dev_priv, data_reg, msg->rx_buf, msg->rx_len);
 185         }
 186
 187         /* XXX: fix for reads and writes */
 188         return 4 + packet.payload_length;
 189 }
 190
 191 static int intel_dsi_host_attach(struct mipi_dsi_host *host,
 192                                  struct mipi_dsi_device *dsi)
 193 {
 194         return 0;
 195 }
 196
 197 static int intel_dsi_host_detach(struct mipi_dsi_host *host,
 198                                  struct mipi_dsi_device *dsi)
 199 {
 200         return 0;
 201 }
 202
 203 static const struct mipi_dsi_host_ops intel_dsi_host_ops = {
 204         .attach = intel_dsi_host_attach,
 205         .detach = intel_dsi_host_detach,
 206         .transfer = intel_dsi_host_transfer,
 207 };
 208
 209 static struct intel_dsi_host *intel_dsi_host_init(struct intel_dsi *intel_dsi,
 210                                                   enum port port)
 211 {
 212         struct intel_dsi_host *host;
 213         struct mipi_dsi_device *device;
 214
 215         host = kzalloc(sizeof(*host), GFP_KERNEL);
 216         if (!host)
 217                 return NULL;
 218
 219         host->base.ops = &intel_dsi_host_ops;
 220         host->intel_dsi = intel_dsi;
 221         host->port = port;
 222
 223         /*
 224          * We should call mipi_dsi_host_register(&host->base) here, but we don't
 225          * have a host->dev, and we don't have OF stuff either. So just use the
 226          * dsi framework as a library and hope for the best. Create the dsi
 227          * devices by ourselves here too. Need to be careful though, because we
 228          * don't initialize any of the driver model devices here.
 229          */
 230         device = kzalloc(sizeof(*device), GFP_KERNEL);
 231         if (!device) {
 232                 kfree(host);
 233                 return NULL;
 234         }
 235
 236         device->host = &host->base;
 237         host->device = device;
 238
 239         return host;
 240 }
 241
 242 /*
 243  * send a video mode command
 244  *
 245  * XXX: commands with data in MIPI_DPI_DATA?
 246  */
 247 static int dpi_send_cmd(struct intel_dsi *intel_dsi, u32 cmd, bool hs,
 248                         enum port port)
 249 {
 250         struct drm_encoder *encoder = &intel_dsi->base.base;
 251         struct drm_device *dev = encoder->dev;
 252         struct drm_i915_private *dev_priv = to_i915(dev);
 253         u32 mask;
 254
 255         /* XXX: pipe, hs */
 256         if (hs)
 257                 cmd &= ~DPI_LP_MODE;
 258         else
 259                 cmd |= DPI_LP_MODE;
 260
 261         /* clear bit */
 262         I915_WRITE(MIPI_INTR_STAT(port), SPL_PKT_SENT_INTERRUPT);
 263
 264         /* XXX: old code skips write if control unchanged */
 265         if (cmd == I915_READ(MIPI_DPI_CONTROL(port)))
 266                 DRM_DEBUG_KMS("Same special packet %02x twice in a row.\n", cmd);
 267
 268         I915_WRITE(MIPI_DPI_CONTROL(port), cmd);
 269
 270         mask = SPL_PKT_SENT_INTERRUPT;
 271         if (intel_wait_for_register(dev_priv,
 272                                     MIPI_INTR_STAT(port), mask, mask,
 273                                     100))
 274                 DRM_ERROR("Video mode command 0x%08x send failed.\n", cmd);
 275
 276         return 0;
 277 }
 278
 279 static void band_gap_reset(struct drm_i915_private *dev_priv)
 280 {
 281         mutex_lock(&dev_priv->sb_lock);
 282
 283         vlv_flisdsi_write(dev_priv, 0x08, 0x0001);
 284         vlv_flisdsi_write(dev_priv, 0x0F, 0x0005);
 285         vlv_flisdsi_write(dev_priv, 0x0F, 0x0025);
 286         udelay(150);
 287         vlv_flisdsi_write(dev_priv, 0x0F, 0x0000);
 288         vlv_flisdsi_write(dev_priv, 0x08, 0x0000);
 289
 290         mutex_unlock(&dev_priv->sb_lock);
 291 }
 292
 293 static inline bool is_vid_mode(struct intel_dsi *intel_dsi)
 294 {
 295         return intel_dsi->operation_mode == INTEL_DSI_VIDEO_MODE;
 296 }
 297
 298 static inline bool is_cmd_mode(struct intel_dsi *intel_dsi)
 299 {
 300         return intel_dsi->operation_mode == INTEL_DSI_COMMAND_MODE;
 301 }
 302
 303 static bool intel_dsi_compute_config(struct intel_encoder *encoder,
 304                                      struct intel_crtc_state *pipe_config,
 305                                      struct drm_connector_state *conn_state)
 306 {
 307         struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
 308         struct intel_dsi *intel_dsi = container_of(encoder, struct intel_dsi,
 309                                                    base);
 310         struct intel_connector *intel_connector = intel_dsi->attached_connector;
 311         struct intel_crtc *crtc = to_intel_crtc(pipe_config->base.crtc);
 312         const struct drm_display_mode *fixed_mode = intel_connector->panel.fixed_mode;
 313         struct drm_display_mode *adjusted_mode = &pipe_config->base.adjusted_mode;
 314         int ret;
 315
 316         DRM_DEBUG_KMS("\n");
 317
 318         if (fixed_mode) {
 319                 intel_fixed_panel_mode(fixed_mode, adjusted_mode);
 320
 321                 if (HAS_GMCH_DISPLAY(dev_priv))
 322                         intel_gmch_panel_fitting(crtc, pipe_config,
 323                                                  conn_state->scaling_mode);
 324                 else
 325                         intel_pch_panel_fitting(crtc, pipe_config,
 326                                                 conn_state->scaling_mode);
 327         }
 328
 329         /* DSI uses short packets for sync events, so clear mode flags for DSI */
 330         adjusted_mode->flags = 0;
 331
 332         if (IS_GEN9_LP(dev_priv)) {
 333                 /* Enable Frame time stamp based scanline reporting */
 334                 adjusted_mode->private_flags |=
 335                         I915_MODE_FLAG_GET_SCANLINE_FROM_TIMESTAMP;
 336
 337                 /* Dual link goes to DSI transcoder A. */
 338                 if (intel_dsi->ports == BIT(PORT_C))
 339                         pipe_config->cpu_transcoder = TRANSCODER_DSI_C;
 340                 else
 341                         pipe_config->cpu_transcoder = TRANSCODER_DSI_A;
 342         }
 343
 344         ret = intel_compute_dsi_pll(encoder, pipe_config);
 345         if (ret)
 346                 return false;
 347
 348         pipe_config->clock_set = true;
 349
 350         return true;
 351 }
 352
 353 static bool glk_dsi_enable_io(struct intel_encoder *encoder)
 354 {
 355         struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
 356         struct intel_dsi *intel_dsi = enc_to_intel_dsi(&encoder->base);
 357         enum port port;
 358         u32 tmp;
 359         bool cold_boot = false;
 360
 361         /* Set the MIPI mode
 362          * If MIPI_Mode is off, then writing to LP_Wake bit is not reflecting.
 363          * Power ON MIPI IO first and then write into IO reset and LP wake bits
 364          */
 365         for_each_dsi_port(port, intel_dsi->ports) {
 366                 tmp = I915_READ(MIPI_CTRL(port));
 367                 I915_WRITE(MIPI_CTRL(port), tmp | GLK_MIPIIO_ENABLE);
 368         }
 369
 370         /* Put the IO into reset */
 371         tmp = I915_READ(MIPI_CTRL(PORT_A));
 372         tmp &= ~GLK_MIPIIO_RESET_RELEASED;
 373         I915_WRITE(MIPI_CTRL(PORT_A), tmp);
 374
 375         /* Program LP Wake */
 376         for_each_dsi_port(port, intel_dsi->ports) {
 377                 tmp = I915_READ(MIPI_CTRL(port));
 378                 if (!(I915_READ(MIPI_DEVICE_READY(port)) & DEVICE_READY))
 379                         tmp &= ~GLK_LP_WAKE;
 380                 else
 381                         tmp |= GLK_LP_WAKE;
 382                 I915_WRITE(MIPI_CTRL(port), tmp);
 383         }
 384
 385         /* Wait for Pwr ACK */
 386         for_each_dsi_port(port, intel_dsi->ports) {
 387                 if (intel_wait_for_register(dev_priv,
 388                                 MIPI_CTRL(port), GLK_MIPIIO_PORT_POWERED,
 389                                 GLK_MIPIIO_PORT_POWERED, 20))
 390                         DRM_ERROR("MIPIO port is powergated\n");
 391         }
 392
 393         /* Check for cold boot scenario */
 394         for_each_dsi_port(port, intel_dsi->ports) {
 395                 cold_boot |= !(I915_READ(MIPI_DEVICE_READY(port)) &
 396                                                         DEVICE_READY);
 397         }
 398
 399         return cold_boot;
 400 }
 401
 402 static void glk_dsi_device_ready(struct intel_encoder *encoder)
 403 {
 404         struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
 405         struct intel_dsi *intel_dsi = enc_to_intel_dsi(&encoder->base);
 406         enum port port;
 407         u32 val;
 408
 409         /* Wait for MIPI PHY status bit to set */
 410         for_each_dsi_port(port, intel_dsi->ports) {
 411                 if (intel_wait_for_register(dev_priv,
 412                                 MIPI_CTRL(port), GLK_PHY_STATUS_PORT_READY,
 413                                 GLK_PHY_STATUS_PORT_READY, 20))
 414                         DRM_ERROR("PHY is not ON\n");
 415         }
 416
 417         /* Get IO out of reset */
 418         val = I915_READ(MIPI_CTRL(PORT_A));
 419         I915_WRITE(MIPI_CTRL(PORT_A), val | GLK_MIPIIO_RESET_RELEASED);
 420
 421         /* Get IO out of Low power state*/
 422         for_each_dsi_port(port, intel_dsi->ports) {
 423                 if (!(I915_READ(MIPI_DEVICE_READY(port)) & DEVICE_READY)) {
 424                         val = I915_READ(MIPI_DEVICE_READY(port));
 425                         val &= ~ULPS_STATE_MASK;
 426                         val |= DEVICE_READY;
 427                         I915_WRITE(MIPI_DEVICE_READY(port), val);
 428                         usleep_range(10, 15);
 429                 } else {
 430                         /* Enter ULPS */
 431                         val = I915_READ(MIPI_DEVICE_READY(port));
 432                         val &= ~ULPS_STATE_MASK;
 433                         val |= (ULPS_STATE_ENTER | DEVICE_READY);
 434                         I915_WRITE(MIPI_DEVICE_READY(port), val);
 435
 436                         /* Wait for ULPS active */
 437                         if (intel_wait_for_register(dev_priv,
 438                                 MIPI_CTRL(port), GLK_ULPS_NOT_ACTIVE, 0, 20))
 439                                 DRM_ERROR("ULPS not active\n");
 440
 441                         /* Exit ULPS */
 442                         val = I915_READ(MIPI_DEVICE_READY(port));
 443                         val &= ~ULPS_STATE_MASK;
 444                         val |= (ULPS_STATE_EXIT | DEVICE_READY);
 445                         I915_WRITE(MIPI_DEVICE_READY(port), val);
 446
 447                         /* Enter Normal Mode */
 448                         val = I915_READ(MIPI_DEVICE_READY(port));
 449                         val &= ~ULPS_STATE_MASK;
 450                         val |= (ULPS_STATE_NORMAL_OPERATION | DEVICE_READY);
 451                         I915_WRITE(MIPI_DEVICE_READY(port), val);
 452
 453                         val = I915_READ(MIPI_CTRL(port));
 454                         val &= ~GLK_LP_WAKE;
 455                         I915_WRITE(MIPI_CTRL(port), val);
 456                 }
 457         }
 458
 459         /* Wait for Stop state */
 460         for_each_dsi_port(port, intel_dsi->ports) {
 461                 if (intel_wait_for_register(dev_priv,
 462                                 MIPI_CTRL(port), GLK_DATA_LANE_STOP_STATE,
 463                                 GLK_DATA_LANE_STOP_STATE, 20))
 464                         DRM_ERROR("Date lane not in STOP state\n");
 465         }
 466
 467         /* Wait for AFE LATCH */
 468         for_each_dsi_port(port, intel_dsi->ports) {
 469                 if (intel_wait_for_register(dev_priv,
 470                                 BXT_MIPI_PORT_CTRL(port), AFE_LATCHOUT,
 471                                 AFE_LATCHOUT, 20))
 472                         DRM_ERROR("D-PHY not entering LP-11 state\n");
 473         }
 474 }
 475
 476 static void bxt_dsi_device_ready(struct intel_encoder *encoder)
 477 {
 478         struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
 479         struct intel_dsi *intel_dsi = enc_to_intel_dsi(&encoder->base);
 480         enum port port;
 481         u32 val;
 482
 483         DRM_DEBUG_KMS("\n");
 484
 485         /* Enable MIPI PHY transparent latch */
 486         for_each_dsi_port(port, intel_dsi->ports) {
 487                 val = I915_READ(BXT_MIPI_PORT_CTRL(port));
 488                 I915_WRITE(BXT_MIPI_PORT_CTRL(port), val | LP_OUTPUT_HOLD);
 489                 usleep_range(2000, 2500);
 490         }
 491
 492         /* Clear ULPS and set device ready */
 493         for_each_dsi_port(port, intel_dsi->ports) {
 494                 val = I915_READ(MIPI_DEVICE_READY(port));
 495                 val &= ~ULPS_STATE_MASK;
 496                 I915_WRITE(MIPI_DEVICE_READY(port), val);
 497                 usleep_range(2000, 2500);
 498                 val |= DEVICE_READY;
 499                 I915_WRITE(MIPI_DEVICE_READY(port), val);
 500         }
 501 }
 502
 503 static void vlv_dsi_device_ready(struct intel_encoder *encoder)
 504 {
 505         struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
 506         struct intel_dsi *intel_dsi = enc_to_intel_dsi(&encoder->base);
 507         enum port port;
 508         u32 val;
 509
 510         DRM_DEBUG_KMS("\n");
 511
 512         mutex_lock(&dev_priv->sb_lock);
 513         /* program rcomp for compliance, reduce from 50 ohms to 45 ohms
 514          * needed everytime after power gate */
 515         vlv_flisdsi_write(dev_priv, 0x04, 0x0004);
 516         mutex_unlock(&dev_priv->sb_lock);
 517
 518         /* bandgap reset is needed after everytime we do power gate */
 519         band_gap_reset(dev_priv);
 520
 521         for_each_dsi_port(port, intel_dsi->ports) {
 522
 523                 I915_WRITE(MIPI_DEVICE_READY(port), ULPS_STATE_ENTER);
 524                 usleep_range(2500, 3000);
 525
 526                 /* Enable MIPI PHY transparent latch
 527                  * Common bit for both MIPI Port A & MIPI Port C
 528                  * No similar bit in MIPI Port C reg
 529                  */
 530                 val = I915_READ(MIPI_PORT_CTRL(PORT_A));
 531                 I915_WRITE(MIPI_PORT_CTRL(PORT_A), val | LP_OUTPUT_HOLD);
 532                 usleep_range(1000, 1500);
 533
 534                 I915_WRITE(MIPI_DEVICE_READY(port), ULPS_STATE_EXIT);
 535                 usleep_range(2500, 3000);
 536
 537                 I915_WRITE(MIPI_DEVICE_READY(port), DEVICE_READY);
 538                 usleep_range(2500, 3000);
 539         }
 540 }
 541
 542 static void intel_dsi_device_ready(struct intel_encoder *encoder)
 543 {
 544         struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
 545
 546         if (IS_VALLEYVIEW(dev_priv) || IS_CHERRYVIEW(dev_priv))
 547                 vlv_dsi_device_ready(encoder);
 548         else if (IS_BROXTON(dev_priv))
 549                 bxt_dsi_device_ready(encoder);
 550         else if (IS_GEMINILAKE(dev_priv))
 551                 glk_dsi_device_ready(encoder);
 552 }
 553
 554 static void glk_dsi_enter_low_power_mode(struct intel_encoder *encoder)
 555 {
 556         struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
 557         struct intel_dsi *intel_dsi = enc_to_intel_dsi(&encoder->base);
 558         enum port port;
 559         u32 val;
 560
 561         /* Enter ULPS */
 562         for_each_dsi_port(port, intel_dsi->ports) {
 563                 val = I915_READ(MIPI_DEVICE_READY(port));
 564                 val &= ~ULPS_STATE_MASK;
 565                 val |= (ULPS_STATE_ENTER | DEVICE_READY);
 566                 I915_WRITE(MIPI_DEVICE_READY(port), val);
 567         }
 568
 569         /* Wait for MIPI PHY status bit to unset */
 570         for_each_dsi_port(port, intel_dsi->ports) {
 571                 if (intel_wait_for_register(dev_priv,
 572                                             MIPI_CTRL(port),
 573                                             GLK_PHY_STATUS_PORT_READY, 0, 20))
 574                         DRM_ERROR("PHY is not turning OFF\n");
 575         }
 576
 577         /* Wait for Pwr ACK bit to unset */
 578         for_each_dsi_port(port, intel_dsi->ports) {
 579                 if (intel_wait_for_register(dev_priv,
 580                                             MIPI_CTRL(port),
 581                                             GLK_MIPIIO_PORT_POWERED, 0, 20))
 582                         DRM_ERROR("MIPI IO Port is not powergated\n");
 583         }
 584 }
 585
 586 static void glk_dsi_disable_mipi_io(struct intel_encoder *encoder)
 587 {
 588         struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
 589         struct intel_dsi *intel_dsi = enc_to_intel_dsi(&encoder->base);
 590         enum port port;
 591         u32 tmp;
 592
 593         /* Put the IO into reset */
 594         tmp = I915_READ(MIPI_CTRL(PORT_A));
 595         tmp &= ~GLK_MIPIIO_RESET_RELEASED;
 596         I915_WRITE(MIPI_CTRL(PORT_A), tmp);
 597
 598         /* Wait for MIPI PHY status bit to unset */
 599         for_each_dsi_port(port, intel_dsi->ports) {
 600                 if (intel_wait_for_register(dev_priv,
 601                                             MIPI_CTRL(port),
 602                                             GLK_PHY_STATUS_PORT_READY, 0, 20))
 603                         DRM_ERROR("PHY is not turning OFF\n");
 604         }
 605
 606         /* Clear MIPI mode */
 607         for_each_dsi_port(port, intel_dsi->ports) {
 608                 tmp = I915_READ(MIPI_CTRL(port));
 609                 tmp &= ~GLK_MIPIIO_ENABLE;
 610                 I915_WRITE(MIPI_CTRL(port), tmp);
 611         }
 612 }
 613
 614 static void glk_dsi_clear_device_ready(struct intel_encoder *encoder)
 615 {
 616         glk_dsi_enter_low_power_mode(encoder);
 617         glk_dsi_disable_mipi_io(encoder);
 618 }
 619
 620 static void vlv_dsi_clear_device_ready(struct intel_encoder *encoder)
 621 {
 622         struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
 623         struct intel_dsi *intel_dsi = enc_to_intel_dsi(&encoder->base);
 624         enum port port;
 625
 626         DRM_DEBUG_KMS("\n");
 627         for_each_dsi_port(port, intel_dsi->ports) {
 628                 /* Common bit for both MIPI Port A & MIPI Port C on VLV/CHV */
 629                 i915_reg_t port_ctrl = IS_GEN9_LP(dev_priv) ?
 630                         BXT_MIPI_PORT_CTRL(port) : MIPI_PORT_CTRL(PORT_A);
 631                 u32 val;
 632
 633                 I915_WRITE(MIPI_DEVICE_READY(port), DEVICE_READY |
 634                                                         ULPS_STATE_ENTER);
 635                 usleep_range(2000, 2500);
 636
 637                 I915_WRITE(MIPI_DEVICE_READY(port), DEVICE_READY |
 638                                                         ULPS_STATE_EXIT);
 639                 usleep_range(2000, 2500);
 640
 641                 I915_WRITE(MIPI_DEVICE_READY(port), DEVICE_READY |
 642                                                         ULPS_STATE_ENTER);
 643                 usleep_range(2000, 2500);
 644
 645                 /*
 646                  * On VLV/CHV, wait till Clock lanes are in LP-00 state for MIPI
 647                  * Port A only. MIPI Port C has no similar bit for checking.
 648                  */
 649                 if ((IS_GEN9_LP(dev_priv) || port == PORT_A) &&
 650                     intel_wait_for_register(dev_priv,
 651                                             port_ctrl, AFE_LATCHOUT, 0,
 652                                             30))
 653                         DRM_ERROR("DSI LP not going Low\n");
 654
 655                 /* Disable MIPI PHY transparent latch */
 656                 val = I915_READ(port_ctrl);
 657                 I915_WRITE(port_ctrl, val & ~LP_OUTPUT_HOLD);
 658                 usleep_range(1000, 1500);
 659
 660                 I915_WRITE(MIPI_DEVICE_READY(port), 0x00);
 661                 usleep_range(2000, 2500);
 662         }
 663 }
 664
 665 static void intel_dsi_port_enable(struct intel_encoder *encoder,
 666                                   const struct intel_crtc_state *crtc_state)
 667 {
 668         struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
 669         struct intel_crtc *crtc = to_intel_crtc(crtc_state->base.crtc);
 670         struct intel_dsi *intel_dsi = enc_to_intel_dsi(&encoder->base);
 671         enum port port;
 672
 673         if (intel_dsi->dual_link == DSI_DUAL_LINK_FRONT_BACK) {
 674                 u32 temp;
 675                 if (IS_GEN9_LP(dev_priv)) {
 676                         for_each_dsi_port(port, intel_dsi->ports) {
 677                                 temp = I915_READ(MIPI_CTRL(port));
 678                                 temp &= ~BXT_PIXEL_OVERLAP_CNT_MASK |
 679                                         intel_dsi->pixel_overlap <<
 680                                         BXT_PIXEL_OVERLAP_CNT_SHIFT;
 681                                 I915_WRITE(MIPI_CTRL(port), temp);
 682                         }
 683                 } else {
 684                         temp = I915_READ(VLV_CHICKEN_3);
 685                         temp &= ~PIXEL_OVERLAP_CNT_MASK |
 686                                         intel_dsi->pixel_overlap <<
 687                                         PIXEL_OVERLAP_CNT_SHIFT;
 688                         I915_WRITE(VLV_CHICKEN_3, temp);
 689                 }
 690         }
 691
 692         for_each_dsi_port(port, intel_dsi->ports) {
 693                 i915_reg_t port_ctrl = IS_GEN9_LP(dev_priv) ?
 694                         BXT_MIPI_PORT_CTRL(port) : MIPI_PORT_CTRL(port);
 695                 u32 temp;
 696
 697                 temp = I915_READ(port_ctrl);
 698
 699                 temp &= ~LANE_CONFIGURATION_MASK;
 700                 temp &= ~DUAL_LINK_MODE_MASK;
 701
 702                 if (intel_dsi->ports == (BIT(PORT_A) | BIT(PORT_C))) {
 703                         temp |= (intel_dsi->dual_link - 1)
 704                                                 << DUAL_LINK_MODE_SHIFT;
 705                         if (IS_BROXTON(dev_priv))
 706                                 temp |= LANE_CONFIGURATION_DUAL_LINK_A;
 707                         else
 708                                 temp |= crtc->pipe ?
 709                                         LANE_CONFIGURATION_DUAL_LINK_B :
 710                                         LANE_CONFIGURATION_DUAL_LINK_A;
 711                 }
 712                 /* assert ip_tg_enable signal */
 713                 I915_WRITE(port_ctrl, temp | DPI_ENABLE);
 714                 POSTING_READ(port_ctrl);
 715         }
 716 }
 717
 718 static void intel_dsi_port_disable(struct intel_encoder *encoder)
 719 {
 720         struct drm_device *dev = encoder->base.dev;
 721         struct drm_i915_private *dev_priv = to_i915(dev);
 722         struct intel_dsi *intel_dsi = enc_to_intel_dsi(&encoder->base);
 723         enum port port;
 724
 725         for_each_dsi_port(port, intel_dsi->ports) {
 726                 i915_reg_t port_ctrl = IS_GEN9_LP(dev_priv) ?
 727                         BXT_MIPI_PORT_CTRL(port) : MIPI_PORT_CTRL(port);
 728                 u32 temp;
 729
 730                 /* de-assert ip_tg_enable signal */
 731                 temp = I915_READ(port_ctrl);
 732                 I915_WRITE(port_ctrl, temp & ~DPI_ENABLE);
 733                 POSTING_READ(port_ctrl);
 734         }
 735 }
 736
 737 static void intel_dsi_prepare(struct intel_encoder *intel_encoder,
 738                               const struct intel_crtc_state *pipe_config);
 739 static void intel_dsi_unprepare(struct intel_encoder *encoder);
 740
 741 static void intel_dsi_msleep(struct intel_dsi *intel_dsi, int msec)
 742 {
 743         struct drm_i915_private *dev_priv = to_i915(intel_dsi->base.base.dev);
 744
 745         /* For v3 VBTs in vid-mode the delays are part of the VBT sequences */
 746         if (is_vid_mode(intel_dsi) && dev_priv->vbt.dsi.seq_version >= 3)
 747                 return;
 748
 749         msleep(msec);
 750 }
 751
 752 /*
 753  * Panel enable/disable sequences from the VBT spec.
 754  *
 755  * Note the spec has AssertReset / DeassertReset swapped from their
 756  * usual naming. We use the normal names to avoid confusion (so below
 757  * they are swapped compared to the spec).
 758  *
 759  * Steps starting with MIPI refer to VBT sequences, note that for v2
 760  * VBTs several steps which have a VBT in v2 are expected to be handled
 761  * directly by the driver, by directly driving gpios for example.
 762  *
 763  * v2 video mode seq         v3 video mode seq         command mode seq
 764  * - power on                - MIPIPanelPowerOn        - power on
 765  * - wait t1+t2                                        - wait t1+t2
 766  * - MIPIDeassertResetPin    - MIPIDeassertResetPin    - MIPIDeassertResetPin
 767  * - io lines to lp-11       - io lines to lp-11       - io lines to lp-11
 768  * - MIPISendInitialDcsCmds  - MIPISendInitialDcsCmds  - MIPISendInitialDcsCmds
 769  *                                                     - MIPITearOn
 770  *                                                     - MIPIDisplayOn
 771  * - turn on DPI             - turn on DPI             - set pipe to dsr mode
 772  * - MIPIDisplayOn           - MIPIDisplayOn
 773  * - wait t5                                           - wait t5
 774  * - backlight on            - MIPIBacklightOn         - backlight on
 775  * ...                       ...                       ... issue mem cmds ...
 776  * - backlight off           - MIPIBacklightOff        - backlight off
 777  * - wait t6                                           - wait t6
 778  * - MIPIDisplayOff
 779  * - turn off DPI            - turn off DPI            - disable pipe dsr mode
 780  *                                                     - MIPITearOff
 781  *                           - MIPIDisplayOff          - MIPIDisplayOff
 782  * - io lines to lp-00       - io lines to lp-00       - io lines to lp-00
 783  * - MIPIAssertResetPin      - MIPIAssertResetPin      - MIPIAssertResetPin
 784  * - wait t3                                           - wait t3
 785  * - power off               - MIPIPanelPowerOff       - power off
 786  * - wait t4                                           - wait t4
 787  */
 788
 789 static void intel_dsi_pre_enable(struct intel_encoder *encoder,
 790                                  const struct intel_crtc_state *pipe_config,
 791                                  const struct drm_connector_state *conn_state)
 792 {
 793         struct intel_dsi *intel_dsi = enc_to_intel_dsi(&encoder->base);
 794         struct drm_crtc *crtc = pipe_config->base.crtc;
 795         struct drm_i915_private *dev_priv = to_i915(crtc->dev);
 796         struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
 797         int pipe = intel_crtc->pipe;
 798         enum port port;
 799         u32 val;
 800         bool glk_cold_boot = false;
 801
 802         DRM_DEBUG_KMS("\n");
 803
 804         intel_set_cpu_fifo_underrun_reporting(dev_priv, pipe, true);
 805
 806         /*
 807          * The BIOS may leave the PLL in a wonky state where it doesn't
 808          * lock. It needs to be fully powered down to fix it.
 809          */
 810         intel_disable_dsi_pll(encoder);
 811         intel_enable_dsi_pll(encoder, pipe_config);
 812
 813         if (IS_BROXTON(dev_priv)) {
 814                 /* Add MIPI IO reset programming for modeset */
 815                 val = I915_READ(BXT_P_CR_GT_DISP_PWRON);
 816                 I915_WRITE(BXT_P_CR_GT_DISP_PWRON,
 817                                         val | MIPIO_RST_CTRL);
 818
 819                 /* Power up DSI regulator */
 820                 I915_WRITE(BXT_P_DSI_REGULATOR_CFG, STAP_SELECT);
 821                 I915_WRITE(BXT_P_DSI_REGULATOR_TX_CTRL, 0);
 822         }
 823
 824         if (IS_VALLEYVIEW(dev_priv) || IS_CHERRYVIEW(dev_priv)) {
 825                 u32 val;
 826
 827                 /* Disable DPOunit clock gating, can stall pipe */
 828                 val = I915_READ(DSPCLK_GATE_D);
 829                 val |= DPOUNIT_CLOCK_GATE_DISABLE;
 830                 I915_WRITE(DSPCLK_GATE_D, val);
 831         }
 832
 833         if (!IS_GEMINILAKE(dev_priv))
 834                 intel_dsi_prepare(encoder, pipe_config);
 835
 836         /* Power on, try both CRC pmic gpio and VBT */
 837         if (intel_dsi->gpio_panel)
 838                 gpiod_set_value_cansleep(intel_dsi->gpio_panel, 1);
 839         intel_dsi_vbt_exec_sequence(intel_dsi, MIPI_SEQ_POWER_ON);
 840         intel_dsi_msleep(intel_dsi, intel_dsi->panel_on_delay);
 841
 842         /* Deassert reset */
 843         intel_dsi_vbt_exec_sequence(intel_dsi, MIPI_SEQ_DEASSERT_RESET);
 844
 845         if (IS_GEMINILAKE(dev_priv)) {
 846                 glk_cold_boot = glk_dsi_enable_io(encoder);
 847
 848                 /* Prepare port in cold boot(s3/s4) scenario */
 849                 if (glk_cold_boot)
 850                         intel_dsi_prepare(encoder, pipe_config);
 851         }
 852
 853         /* Put device in ready state (LP-11) */
 854         intel_dsi_device_ready(encoder);
 855
 856         /* Prepare port in normal boot scenario */
 857         if (IS_GEMINILAKE(dev_priv) && !glk_cold_boot)
 858                 intel_dsi_prepare(encoder, pipe_config);
 859
 860         /* Send initialization commands in LP mode */
 861         intel_dsi_vbt_exec_sequence(intel_dsi, MIPI_SEQ_INIT_OTP);
 862
 863         /* Enable port in pre-enable phase itself because as per hw team
 864          * recommendation, port should be enabled befor plane & pipe */
 865         if (is_cmd_mode(intel_dsi)) {
 866                 for_each_dsi_port(port, intel_dsi->ports)
 867                         I915_WRITE(MIPI_MAX_RETURN_PKT_SIZE(port), 8 * 4);
 868                 intel_dsi_vbt_exec_sequence(intel_dsi, MIPI_SEQ_TEAR_ON);
 869                 intel_dsi_vbt_exec_sequence(intel_dsi, MIPI_SEQ_DISPLAY_ON);
 870         } else {
 871                 msleep(20); /* XXX */
 872                 for_each_dsi_port(port, intel_dsi->ports)
 873                         dpi_send_cmd(intel_dsi, TURN_ON, false, port);
 874                 intel_dsi_msleep(intel_dsi, 100);
 875
 876                 intel_dsi_vbt_exec_sequence(intel_dsi, MIPI_SEQ_DISPLAY_ON);
 877
 878                 intel_dsi_port_enable(encoder, pipe_config);
 879         }
 880
 881         intel_panel_enable_backlight(pipe_config, conn_state);
 882         intel_dsi_vbt_exec_sequence(intel_dsi, MIPI_SEQ_BACKLIGHT_ON);
 883 }
 884
 885 /*
 886  * DSI port enable has to be done before pipe and plane enable, so we do it in
 887  * the pre_enable hook.
 888  */
 889 static void intel_dsi_enable_nop(struct intel_encoder *encoder,
 890                                  const struct intel_crtc_state *pipe_config,
 891                                  const struct drm_connector_state *conn_state)
 892 {
 893         DRM_DEBUG_KMS("\n");
 894 }
 895
 896 /*
 897  * DSI port disable has to be done after pipe and plane disable, so we do it in
 898  * the post_disable hook.
 899  */
 900 static void intel_dsi_disable(struct intel_encoder *encoder,
 901                               const struct intel_crtc_state *old_crtc_state,
 902                               const struct drm_connector_state *old_conn_state)
 903 {
 904         struct intel_dsi *intel_dsi = enc_to_intel_dsi(&encoder->base);
 905         enum port port;
 906
 907         DRM_DEBUG_KMS("\n");
 908
 909         intel_dsi_vbt_exec_sequence(intel_dsi, MIPI_SEQ_BACKLIGHT_OFF);
 910         intel_panel_disable_backlight(old_conn_state);
 911
 912         /*
 913          * According to the spec we should send SHUTDOWN before
 914          * MIPI_SEQ_DISPLAY_OFF only for v3+ VBTs, but field testing
 915          * has shown that the v3 sequence works for v2 VBTs too
 916          */
 917         if (is_vid_mode(intel_dsi)) {
 918                 /* Send Shutdown command to the panel in LP mode */
 919                 for_each_dsi_port(port, intel_dsi->ports)
 920                         dpi_send_cmd(intel_dsi, SHUTDOWN, false, port);
 921                 msleep(10);
 922         }
 923 }
 924
 925 static void intel_dsi_clear_device_ready(struct intel_encoder *encoder)
 926 {
 927         struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
 928
 929         if (IS_VALLEYVIEW(dev_priv) || IS_CHERRYVIEW(dev_priv) ||
 930             IS_BROXTON(dev_priv))
 931                 vlv_dsi_clear_device_ready(encoder);
 932         else if (IS_GEMINILAKE(dev_priv))
 933                 glk_dsi_clear_device_ready(encoder);
 934 }
 935
 936 static void intel_dsi_post_disable(struct intel_encoder *encoder,
 937                                    const struct intel_crtc_state *pipe_config,
 938                                    const struct drm_connector_state *conn_state)
 939 {
 940         struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
 941         struct intel_dsi *intel_dsi = enc_to_intel_dsi(&encoder->base);
 942         enum port port;
 943         u32 val;
 944
 945         DRM_DEBUG_KMS("\n");
 946
 947         if (is_vid_mode(intel_dsi)) {
 948                 for_each_dsi_port(port, intel_dsi->ports)
 949                         wait_for_dsi_fifo_empty(intel_dsi, port);
 950
 951                 intel_dsi_port_disable(encoder);
 952                 usleep_range(2000, 5000);
 953         }
 954
 955         intel_dsi_unprepare(encoder);
 956
 957         /*
 958          * if disable packets are sent before sending shutdown packet then in
 959          * some next enable sequence send turn on packet error is observed
 960          */
 961         if (is_cmd_mode(intel_dsi))
 962                 intel_dsi_vbt_exec_sequence(intel_dsi, MIPI_SEQ_TEAR_OFF);
 963         intel_dsi_vbt_exec_sequence(intel_dsi, MIPI_SEQ_DISPLAY_OFF);
 964
 965         /* Transition to LP-00 */
 966         intel_dsi_clear_device_ready(encoder);
 967
 968         if (IS_BROXTON(dev_priv)) {
 969                 /* Power down DSI regulator to save power */
 970                 I915_WRITE(BXT_P_DSI_REGULATOR_CFG, STAP_SELECT);
 971                 I915_WRITE(BXT_P_DSI_REGULATOR_TX_CTRL, HS_IO_CTRL_SELECT);
 972
 973                 /* Add MIPI IO reset programming for modeset */
 974                 val = I915_READ(BXT_P_CR_GT_DISP_PWRON);
 975                 I915_WRITE(BXT_P_CR_GT_DISP_PWRON,
 976                                 val & ~MIPIO_RST_CTRL);
 977         }
 978
 979         intel_disable_dsi_pll(encoder);
 980
 981         if (IS_VALLEYVIEW(dev_priv) || IS_CHERRYVIEW(dev_priv)) {
 982                 u32 val;
 983
 984                 val = I915_READ(DSPCLK_GATE_D);
 985                 val &= ~DPOUNIT_CLOCK_GATE_DISABLE;
 986                 I915_WRITE(DSPCLK_GATE_D, val);
 987         }
 988
 989         /* Assert reset */
 990         intel_dsi_vbt_exec_sequence(intel_dsi, MIPI_SEQ_ASSERT_RESET);
 991
 992         /* Power off, try both CRC pmic gpio and VBT */
 993         intel_dsi_msleep(intel_dsi, intel_dsi->panel_off_delay);
 994         intel_dsi_vbt_exec_sequence(intel_dsi, MIPI_SEQ_POWER_OFF);
 995         if (intel_dsi->gpio_panel)
 996                 gpiod_set_value_cansleep(intel_dsi->gpio_panel, 0);
 997
 998         /*
 999          * FIXME As we do with eDP, just make a note of the time here
1000          * and perform the wait before the next panel power on.
1001          */
1002         intel_dsi_msleep(intel_dsi, 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->base);
1010         enum port port;
1011         bool active = false;
1012
1013         DRM_DEBUG_KMS("\n");
1014
1015         if (!intel_display_power_get_if_enabled(dev_priv,
1016                                                 encoder->power_domain))
1017                 return false;
1018
1019         /*
1020          * On Broxton the PLL needs to be enabled with a valid divider
1021          * configuration, otherwise accessing DSI registers will hang the
1022          * machine. See BSpec North Display Engine registers/MIPI[BXT].
1023          */
1024         if (IS_GEN9_LP(dev_priv) && !intel_dsi_pll_is_enabled(dev_priv))
1025                 goto out_put_power;
1026
1027         /* XXX: this only works for one DSI output */
1028         for_each_dsi_port(port, intel_dsi->ports) {
1029                 i915_reg_t ctrl_reg = IS_GEN9_LP(dev_priv) ?
1030                         BXT_MIPI_PORT_CTRL(port) : MIPI_PORT_CTRL(port);
1031                 bool enabled = I915_READ(ctrl_reg) & DPI_ENABLE;
1032
1033                 /*
1034                  * Due to some hardware limitations on VLV/CHV, the DPI enable
1035                  * bit in port C control register does not get set. As a
1036                  * workaround, check pipe B conf instead.
1037                  */
1038                 if ((IS_VALLEYVIEW(dev_priv) || IS_CHERRYVIEW(dev_priv)) &&
1039                     port == PORT_C)
1040                         enabled = I915_READ(PIPECONF(PIPE_B)) & PIPECONF_ENABLE;
1041
1042                 /* Try command mode if video mode not enabled */
1043                 if (!enabled) {
1044                         u32 tmp = I915_READ(MIPI_DSI_FUNC_PRG(port));
1045                         enabled = tmp & CMD_MODE_DATA_WIDTH_MASK;
1046                 }
1047
1048                 if (!enabled)
1049                         continue;
1050
1051                 if (!(I915_READ(MIPI_DEVICE_READY(port)) & DEVICE_READY))
1052                         continue;
1053
1054                 if (IS_GEN9_LP(dev_priv)) {
1055                         u32 tmp = I915_READ(MIPI_CTRL(port));
1056                         tmp &= BXT_PIPE_SELECT_MASK;
1057                         tmp >>= BXT_PIPE_SELECT_SHIFT;
1058
1059                         if (WARN_ON(tmp > PIPE_C))
1060                                 continue;
1061
1062                         *pipe = tmp;
1063                 } else {
1064                         *pipe = port == PORT_A ? PIPE_A : PIPE_B;
1065                 }
1066
1067                 active = true;
1068                 break;
1069         }
1070
1071 out_put_power:
1072         intel_display_power_put(dev_priv, encoder->power_domain);
1073
1074         return active;
1075 }
1076
1077 static void bxt_dsi_get_pipe_config(struct intel_encoder *encoder,
1078                                     struct intel_crtc_state *pipe_config)
1079 {
1080         struct drm_device *dev = encoder->base.dev;
1081         struct drm_i915_private *dev_priv = to_i915(dev);
1082         struct drm_display_mode *adjusted_mode =
1083                                         &pipe_config->base.adjusted_mode;
1084         struct drm_display_mode *adjusted_mode_sw;
1085         struct intel_crtc *crtc = to_intel_crtc(pipe_config->base.crtc);
1086         struct intel_dsi *intel_dsi = enc_to_intel_dsi(&encoder->base);
1087         unsigned int lane_count = intel_dsi->lane_count;
1088         unsigned int bpp, fmt;
1089         enum port port;
1090         u16 hactive, hfp, hsync, hbp, vfp, vsync, vbp;
1091         u16 hfp_sw, hsync_sw, hbp_sw;
1092         u16 crtc_htotal_sw, crtc_hsync_start_sw, crtc_hsync_end_sw,
1093                                 crtc_hblank_start_sw, crtc_hblank_end_sw;
1094
1095         /* FIXME: hw readout should not depend on SW state */
1096         adjusted_mode_sw = &crtc->config->base.adjusted_mode;
1097
1098         /*
1099          * Atleast one port is active as encoder->get_config called only if
1100          * encoder->get_hw_state() returns true.
1101          */
1102         for_each_dsi_port(port, intel_dsi->ports) {
1103                 if (I915_READ(BXT_MIPI_PORT_CTRL(port)) & DPI_ENABLE)
1104                         break;
1105         }
1106
1107         fmt = I915_READ(MIPI_DSI_FUNC_PRG(port)) & VID_MODE_FORMAT_MASK;
1108         pipe_config->pipe_bpp =
1109                         mipi_dsi_pixel_format_to_bpp(
1110                                 pixel_format_from_register_bits(fmt));
1111         bpp = pipe_config->pipe_bpp;
1112
1113         /* Enable Frame time stamo based scanline reporting */
1114         adjusted_mode->private_flags |=
1115                         I915_MODE_FLAG_GET_SCANLINE_FROM_TIMESTAMP;
1116
1117         /* In terms of pixels */
1118         adjusted_mode->crtc_hdisplay =
1119                                 I915_READ(BXT_MIPI_TRANS_HACTIVE(port));
1120         adjusted_mode->crtc_vdisplay =
1121                                 I915_READ(BXT_MIPI_TRANS_VACTIVE(port));
1122         adjusted_mode->crtc_vtotal =
1123                                 I915_READ(BXT_MIPI_TRANS_VTOTAL(port));
1124
1125         hactive = adjusted_mode->crtc_hdisplay;
1126         hfp = I915_READ(MIPI_HFP_COUNT(port));
1127
1128         /*
1129          * Meaningful for video mode non-burst sync pulse mode only,
1130          * can be zero for non-burst sync events and burst modes
1131          */
1132         hsync = I915_READ(MIPI_HSYNC_PADDING_COUNT(port));
1133         hbp = I915_READ(MIPI_HBP_COUNT(port));
1134
1135         /* harizontal values are in terms of high speed byte clock */
1136         hfp = pixels_from_txbyteclkhs(hfp, bpp, lane_count,
1137                                                 intel_dsi->burst_mode_ratio);
1138         hsync = pixels_from_txbyteclkhs(hsync, bpp, lane_count,
1139                                                 intel_dsi->burst_mode_ratio);
1140         hbp = pixels_from_txbyteclkhs(hbp, bpp, lane_count,
1141                                                 intel_dsi->burst_mode_ratio);
1142
1143         if (intel_dsi->dual_link) {
1144                 hfp *= 2;
1145                 hsync *= 2;
1146                 hbp *= 2;
1147         }
1148
1149         /* vertical values are in terms of lines */
1150         vfp = I915_READ(MIPI_VFP_COUNT(port));
1151         vsync = I915_READ(MIPI_VSYNC_PADDING_COUNT(port));
1152         vbp = I915_READ(MIPI_VBP_COUNT(port));
1153
1154         adjusted_mode->crtc_htotal = hactive + hfp + hsync + hbp;
1155         adjusted_mode->crtc_hsync_start = hfp + adjusted_mode->crtc_hdisplay;
1156         adjusted_mode->crtc_hsync_end = hsync + adjusted_mode->crtc_hsync_start;
1157         adjusted_mode->crtc_hblank_start = adjusted_mode->crtc_hdisplay;
1158         adjusted_mode->crtc_hblank_end = adjusted_mode->crtc_htotal;
1159
1160         adjusted_mode->crtc_vsync_start = vfp + adjusted_mode->crtc_vdisplay;
1161         adjusted_mode->crtc_vsync_end = vsync + adjusted_mode->crtc_vsync_start;
1162         adjusted_mode->crtc_vblank_start = adjusted_mode->crtc_vdisplay;
1163         adjusted_mode->crtc_vblank_end = adjusted_mode->crtc_vtotal;
1164
1165         /*
1166          * In BXT DSI there is no regs programmed with few horizontal timings
1167          * in Pixels but txbyteclkhs.. So retrieval process adds some
1168          * ROUND_UP ERRORS in the process of PIXELS<==>txbyteclkhs.
1169          * Actually here for the given adjusted_mode, we are calculating the
1170          * value programmed to the port and then back to the horizontal timing
1171          * param in pixels. This is the expected value, including roundup errors
1172          * And if that is same as retrieved value from port, then
1173          * (HW state) adjusted_mode's horizontal timings are corrected to
1174          * match with SW state to nullify the errors.
1175          */
1176         /* Calculating the value programmed to the Port register */
1177         hfp_sw = adjusted_mode_sw->crtc_hsync_start -
1178                                         adjusted_mode_sw->crtc_hdisplay;
1179         hsync_sw = adjusted_mode_sw->crtc_hsync_end -
1180                                         adjusted_mode_sw->crtc_hsync_start;
1181         hbp_sw = adjusted_mode_sw->crtc_htotal -
1182                                         adjusted_mode_sw->crtc_hsync_end;
1183
1184         if (intel_dsi->dual_link) {
1185                 hfp_sw /= 2;
1186                 hsync_sw /= 2;
1187                 hbp_sw /= 2;
1188         }
1189
1190         hfp_sw = txbyteclkhs(hfp_sw, bpp, lane_count,
1191                                                 intel_dsi->burst_mode_ratio);
1192         hsync_sw = txbyteclkhs(hsync_sw, bpp, lane_count,
1193                             intel_dsi->burst_mode_ratio);
1194         hbp_sw = txbyteclkhs(hbp_sw, bpp, lane_count,
1195                                                 intel_dsi->burst_mode_ratio);
1196
1197         /* Reverse calculating the adjusted mode parameters from port reg vals*/
1198         hfp_sw = pixels_from_txbyteclkhs(hfp_sw, bpp, lane_count,
1199                                                 intel_dsi->burst_mode_ratio);
1200         hsync_sw = pixels_from_txbyteclkhs(hsync_sw, bpp, lane_count,
1201                                                 intel_dsi->burst_mode_ratio);
1202         hbp_sw = pixels_from_txbyteclkhs(hbp_sw, bpp, lane_count,
1203                                                 intel_dsi->burst_mode_ratio);
1204
1205         if (intel_dsi->dual_link) {
1206                 hfp_sw *= 2;
1207                 hsync_sw *= 2;
1208                 hbp_sw *= 2;
1209         }
1210
1211         crtc_htotal_sw = adjusted_mode_sw->crtc_hdisplay + hfp_sw +
1212                                                         hsync_sw + hbp_sw;
1213         crtc_hsync_start_sw = hfp_sw + adjusted_mode_sw->crtc_hdisplay;
1214         crtc_hsync_end_sw = hsync_sw + crtc_hsync_start_sw;
1215         crtc_hblank_start_sw = adjusted_mode_sw->crtc_hdisplay;
1216         crtc_hblank_end_sw = crtc_htotal_sw;
1217
1218         if (adjusted_mode->crtc_htotal == crtc_htotal_sw)
1219                 adjusted_mode->crtc_htotal = adjusted_mode_sw->crtc_htotal;
1220
1221         if (adjusted_mode->crtc_hsync_start == crtc_hsync_start_sw)
1222                 adjusted_mode->crtc_hsync_start =
1223                                         adjusted_mode_sw->crtc_hsync_start;
1224
1225         if (adjusted_mode->crtc_hsync_end == crtc_hsync_end_sw)
1226                 adjusted_mode->crtc_hsync_end =
1227                                         adjusted_mode_sw->crtc_hsync_end;
1228
1229         if (adjusted_mode->crtc_hblank_start == crtc_hblank_start_sw)
1230                 adjusted_mode->crtc_hblank_start =
1231                                         adjusted_mode_sw->crtc_hblank_start;
1232
1233         if (adjusted_mode->crtc_hblank_end == crtc_hblank_end_sw)
1234                 adjusted_mode->crtc_hblank_end =
1235                                         adjusted_mode_sw->crtc_hblank_end;
1236 }
1237
1238 static void intel_dsi_get_config(struct intel_encoder *encoder,
1239                                  struct intel_crtc_state *pipe_config)
1240 {
1241         struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
1242         u32 pclk;
1243         DRM_DEBUG_KMS("\n");
1244
1245         pipe_config->output_types |= BIT(INTEL_OUTPUT_DSI);
1246
1247         if (IS_GEN9_LP(dev_priv))
1248                 bxt_dsi_get_pipe_config(encoder, pipe_config);
1249
1250         pclk = intel_dsi_get_pclk(encoder, pipe_config->pipe_bpp,
1251                                   pipe_config);
1252         if (!pclk)
1253                 return;
1254
1255         pipe_config->base.adjusted_mode.crtc_clock = pclk;
1256         pipe_config->port_clock = pclk;
1257 }
1258
1259 static enum drm_mode_status
1260 intel_dsi_mode_valid(struct drm_connector *connector,
1261                      struct drm_display_mode *mode)
1262 {
1263         struct intel_connector *intel_connector = to_intel_connector(connector);
1264         const struct drm_display_mode *fixed_mode = intel_connector->panel.fixed_mode;
1265         int max_dotclk = to_i915(connector->dev)->max_dotclk_freq;
1266
1267         DRM_DEBUG_KMS("\n");
1268
1269         if (mode->flags & DRM_MODE_FLAG_DBLSCAN) {
1270                 DRM_DEBUG_KMS("MODE_NO_DBLESCAN\n");
1271                 return MODE_NO_DBLESCAN;
1272         }
1273
1274         if (fixed_mode) {
1275                 if (mode->hdisplay > fixed_mode->hdisplay)
1276                         return MODE_PANEL;
1277                 if (mode->vdisplay > fixed_mode->vdisplay)
1278                         return MODE_PANEL;
1279                 if (fixed_mode->clock > max_dotclk)
1280                         return MODE_CLOCK_HIGH;
1281         }
1282
1283         return MODE_OK;
1284 }
1285
1286 /* return txclkesc cycles in terms of divider and duration in us */
1287 static u16 txclkesc(u32 divider, unsigned int us)
1288 {
1289         switch (divider) {
1290         case ESCAPE_CLOCK_DIVIDER_1:
1291         default:
1292                 return 20 * us;
1293         case ESCAPE_CLOCK_DIVIDER_2:
1294                 return 10 * us;
1295         case ESCAPE_CLOCK_DIVIDER_4:
1296                 return 5 * us;
1297         }
1298 }
1299
1300 static void set_dsi_timings(struct drm_encoder *encoder,
1301                             const struct drm_display_mode *adjusted_mode)
1302 {
1303         struct drm_device *dev = encoder->dev;
1304         struct drm_i915_private *dev_priv = to_i915(dev);
1305         struct intel_dsi *intel_dsi = enc_to_intel_dsi(encoder);
1306         enum port port;
1307         unsigned int bpp = mipi_dsi_pixel_format_to_bpp(intel_dsi->pixel_format);
1308         unsigned int lane_count = intel_dsi->lane_count;
1309
1310         u16 hactive, hfp, hsync, hbp, vfp, vsync, vbp;
1311
1312         hactive = adjusted_mode->crtc_hdisplay;
1313         hfp = adjusted_mode->crtc_hsync_start - adjusted_mode->crtc_hdisplay;
1314         hsync = adjusted_mode->crtc_hsync_end - adjusted_mode->crtc_hsync_start;
1315         hbp = adjusted_mode->crtc_htotal - adjusted_mode->crtc_hsync_end;
1316
1317         if (intel_dsi->dual_link) {
1318                 hactive /= 2;
1319                 if (intel_dsi->dual_link == DSI_DUAL_LINK_FRONT_BACK)
1320                         hactive += intel_dsi->pixel_overlap;
1321                 hfp /= 2;
1322                 hsync /= 2;
1323                 hbp /= 2;
1324         }
1325
1326         vfp = adjusted_mode->crtc_vsync_start - adjusted_mode->crtc_vdisplay;
1327         vsync = adjusted_mode->crtc_vsync_end - adjusted_mode->crtc_vsync_start;
1328         vbp = adjusted_mode->crtc_vtotal - adjusted_mode->crtc_vsync_end;
1329
1330         /* horizontal values are in terms of high speed byte clock */
1331         hactive = txbyteclkhs(hactive, bpp, lane_count,
1332                               intel_dsi->burst_mode_ratio);
1333         hfp = txbyteclkhs(hfp, bpp, lane_count, intel_dsi->burst_mode_ratio);
1334         hsync = txbyteclkhs(hsync, bpp, lane_count,
1335                             intel_dsi->burst_mode_ratio);
1336         hbp = txbyteclkhs(hbp, bpp, lane_count, intel_dsi->burst_mode_ratio);
1337
1338         for_each_dsi_port(port, intel_dsi->ports) {
1339                 if (IS_GEN9_LP(dev_priv)) {
1340                         /*
1341                          * Program hdisplay and vdisplay on MIPI transcoder.
1342                          * This is different from calculated hactive and
1343                          * vactive, as they are calculated per channel basis,
1344                          * whereas these values should be based on resolution.
1345                          */
1346                         I915_WRITE(BXT_MIPI_TRANS_HACTIVE(port),
1347                                    adjusted_mode->crtc_hdisplay);
1348                         I915_WRITE(BXT_MIPI_TRANS_VACTIVE(port),
1349                                    adjusted_mode->crtc_vdisplay);
1350                         I915_WRITE(BXT_MIPI_TRANS_VTOTAL(port),
1351                                    adjusted_mode->crtc_vtotal);
1352                 }
1353
1354                 I915_WRITE(MIPI_HACTIVE_AREA_COUNT(port), hactive);
1355                 I915_WRITE(MIPI_HFP_COUNT(port), hfp);
1356
1357                 /* meaningful for video mode non-burst sync pulse mode only,
1358                  * can be zero for non-burst sync events and burst modes */
1359                 I915_WRITE(MIPI_HSYNC_PADDING_COUNT(port), hsync);
1360                 I915_WRITE(MIPI_HBP_COUNT(port), hbp);
1361
1362                 /* vertical values are in terms of lines */
1363                 I915_WRITE(MIPI_VFP_COUNT(port), vfp);
1364                 I915_WRITE(MIPI_VSYNC_PADDING_COUNT(port), vsync);
1365                 I915_WRITE(MIPI_VBP_COUNT(port), vbp);
1366         }
1367 }
1368
1369 static u32 pixel_format_to_reg(enum mipi_dsi_pixel_format fmt)
1370 {
1371         switch (fmt) {
1372         case MIPI_DSI_FMT_RGB888:
1373                 return VID_MODE_FORMAT_RGB888;
1374         case MIPI_DSI_FMT_RGB666:
1375                 return VID_MODE_FORMAT_RGB666;
1376         case MIPI_DSI_FMT_RGB666_PACKED:
1377                 return VID_MODE_FORMAT_RGB666_PACKED;
1378         case MIPI_DSI_FMT_RGB565:
1379                 return VID_MODE_FORMAT_RGB565;
1380         default:
1381                 MISSING_CASE(fmt);
1382                 return VID_MODE_FORMAT_RGB666;
1383         }
1384 }
1385
1386 static void intel_dsi_prepare(struct intel_encoder *intel_encoder,
1387                               const struct intel_crtc_state *pipe_config)
1388 {
1389         struct drm_encoder *encoder = &intel_encoder->base;
1390         struct drm_device *dev = encoder->dev;
1391         struct drm_i915_private *dev_priv = to_i915(dev);
1392         struct intel_crtc *intel_crtc = to_intel_crtc(pipe_config->base.crtc);
1393         struct intel_dsi *intel_dsi = enc_to_intel_dsi(encoder);
1394         const struct drm_display_mode *adjusted_mode = &pipe_config->base.adjusted_mode;
1395         enum port port;
1396         unsigned int bpp = mipi_dsi_pixel_format_to_bpp(intel_dsi->pixel_format);
1397         u32 val, tmp;
1398         u16 mode_hdisplay;
1399
1400         DRM_DEBUG_KMS("pipe %c\n", pipe_name(intel_crtc->pipe));
1401
1402         mode_hdisplay = adjusted_mode->crtc_hdisplay;
1403
1404         if (intel_dsi->dual_link) {
1405                 mode_hdisplay /= 2;
1406                 if (intel_dsi->dual_link == DSI_DUAL_LINK_FRONT_BACK)
1407                         mode_hdisplay += intel_dsi->pixel_overlap;
1408         }
1409
1410         for_each_dsi_port(port, intel_dsi->ports) {
1411                 if (IS_VALLEYVIEW(dev_priv) || IS_CHERRYVIEW(dev_priv)) {
1412                         /*
1413                          * escape clock divider, 20MHz, shared for A and C.
1414                          * device ready must be off when doing this! txclkesc?
1415                          */
1416                         tmp = I915_READ(MIPI_CTRL(PORT_A));
1417                         tmp &= ~ESCAPE_CLOCK_DIVIDER_MASK;
1418                         I915_WRITE(MIPI_CTRL(PORT_A), tmp |
1419                                         ESCAPE_CLOCK_DIVIDER_1);
1420
1421                         /* read request priority is per pipe */
1422                         tmp = I915_READ(MIPI_CTRL(port));
1423                         tmp &= ~READ_REQUEST_PRIORITY_MASK;
1424                         I915_WRITE(MIPI_CTRL(port), tmp |
1425                                         READ_REQUEST_PRIORITY_HIGH);
1426                 } else if (IS_GEN9_LP(dev_priv)) {
1427                         enum pipe pipe = intel_crtc->pipe;
1428
1429                         tmp = I915_READ(MIPI_CTRL(port));
1430                         tmp &= ~BXT_PIPE_SELECT_MASK;
1431
1432                         tmp |= BXT_PIPE_SELECT(pipe);
1433                         I915_WRITE(MIPI_CTRL(port), tmp);
1434                 }
1435
1436                 /* XXX: why here, why like this? handling in irq handler?! */
1437                 I915_WRITE(MIPI_INTR_STAT(port), 0xffffffff);
1438                 I915_WRITE(MIPI_INTR_EN(port), 0xffffffff);
1439
1440                 I915_WRITE(MIPI_DPHY_PARAM(port), intel_dsi->dphy_reg);
1441
1442                 I915_WRITE(MIPI_DPI_RESOLUTION(port),
1443                         adjusted_mode->crtc_vdisplay << VERTICAL_ADDRESS_SHIFT |
1444                         mode_hdisplay << HORIZONTAL_ADDRESS_SHIFT);
1445         }
1446
1447         set_dsi_timings(encoder, adjusted_mode);
1448
1449         val = intel_dsi->lane_count << DATA_LANES_PRG_REG_SHIFT;
1450         if (is_cmd_mode(intel_dsi)) {
1451                 val |= intel_dsi->channel << CMD_MODE_CHANNEL_NUMBER_SHIFT;
1452                 val |= CMD_MODE_DATA_WIDTH_8_BIT; /* XXX */
1453         } else {
1454                 val |= intel_dsi->channel << VID_MODE_CHANNEL_NUMBER_SHIFT;
1455                 val |= pixel_format_to_reg(intel_dsi->pixel_format);
1456         }
1457
1458         tmp = 0;
1459         if (intel_dsi->eotp_pkt == 0)
1460                 tmp |= EOT_DISABLE;
1461         if (intel_dsi->clock_stop)
1462                 tmp |= CLOCKSTOP;
1463
1464         if (IS_GEN9_LP(dev_priv)) {
1465                 tmp |= BXT_DPHY_DEFEATURE_EN;
1466                 if (!is_cmd_mode(intel_dsi))
1467                         tmp |= BXT_DEFEATURE_DPI_FIFO_CTR;
1468         }
1469
1470         for_each_dsi_port(port, intel_dsi->ports) {
1471                 I915_WRITE(MIPI_DSI_FUNC_PRG(port), val);
1472
1473                 /* timeouts for recovery. one frame IIUC. if counter expires,
1474                  * EOT and stop state. */
1475
1476                 /*
1477                  * In burst mode, value greater than one DPI line Time in byte
1478                  * clock (txbyteclkhs) To timeout this timer 1+ of the above
1479                  * said value is recommended.
1480                  *
1481                  * In non-burst mode, Value greater than one DPI frame time in
1482                  * byte clock(txbyteclkhs) To timeout this timer 1+ of the above
1483                  * said value is recommended.
1484                  *
1485                  * In DBI only mode, value greater than one DBI frame time in
1486                  * byte clock(txbyteclkhs) To timeout this timer 1+ of the above
1487                  * said value is recommended.
1488                  */
1489
1490                 if (is_vid_mode(intel_dsi) &&
1491                         intel_dsi->video_mode_format == VIDEO_MODE_BURST) {
1492                         I915_WRITE(MIPI_HS_TX_TIMEOUT(port),
1493                                 txbyteclkhs(adjusted_mode->crtc_htotal, bpp,
1494                                             intel_dsi->lane_count,
1495                                             intel_dsi->burst_mode_ratio) + 1);
1496                 } else {
1497                         I915_WRITE(MIPI_HS_TX_TIMEOUT(port),
1498                                 txbyteclkhs(adjusted_mode->crtc_vtotal *
1499                                             adjusted_mode->crtc_htotal,
1500                                             bpp, intel_dsi->lane_count,
1501                                             intel_dsi->burst_mode_ratio) + 1);
1502                 }
1503                 I915_WRITE(MIPI_LP_RX_TIMEOUT(port), intel_dsi->lp_rx_timeout);
1504                 I915_WRITE(MIPI_TURN_AROUND_TIMEOUT(port),
1505                                                 intel_dsi->turn_arnd_val);
1506                 I915_WRITE(MIPI_DEVICE_RESET_TIMER(port),
1507                                                 intel_dsi->rst_timer_val);
1508
1509                 /* dphy stuff */
1510
1511                 /* in terms of low power clock */
1512                 I915_WRITE(MIPI_INIT_COUNT(port),
1513                                 txclkesc(intel_dsi->escape_clk_div, 100));
1514
1515                 if (IS_GEN9_LP(dev_priv) && (!intel_dsi->dual_link)) {
1516                         /*
1517                          * BXT spec says write MIPI_INIT_COUNT for
1518                          * both the ports, even if only one is
1519                          * getting used. So write the other port
1520                          * if not in dual link mode.
1521                          */
1522                         I915_WRITE(MIPI_INIT_COUNT(port ==
1523                                                 PORT_A ? PORT_C : PORT_A),
1524                                         intel_dsi->init_count);
1525                 }
1526
1527                 /* recovery disables */
1528                 I915_WRITE(MIPI_EOT_DISABLE(port), tmp);
1529
1530                 /* in terms of low power clock */
1531                 I915_WRITE(MIPI_INIT_COUNT(port), intel_dsi->init_count);
1532
1533                 /* in terms of txbyteclkhs. actual high to low switch +
1534                  * MIPI_STOP_STATE_STALL * MIPI_LP_BYTECLK.
1535                  *
1536                  * XXX: write MIPI_STOP_STATE_STALL?
1537                  */
1538                 I915_WRITE(MIPI_HIGH_LOW_SWITCH_COUNT(port),
1539                                                 intel_dsi->hs_to_lp_count);
1540
1541                 /* XXX: low power clock equivalence in terms of byte clock.
1542                  * the number of byte clocks occupied in one low power clock.
1543                  * based on txbyteclkhs and txclkesc.
1544                  * txclkesc time / txbyteclk time * (105 + MIPI_STOP_STATE_STALL
1545                  * ) / 105.???
1546                  */
1547                 I915_WRITE(MIPI_LP_BYTECLK(port), intel_dsi->lp_byte_clk);
1548
1549                 if (IS_GEMINILAKE(dev_priv)) {
1550                         I915_WRITE(MIPI_TLPX_TIME_COUNT(port),
1551                                         intel_dsi->lp_byte_clk);
1552                         /* Shadow of DPHY reg */
1553                         I915_WRITE(MIPI_CLK_LANE_TIMING(port),
1554                                         intel_dsi->dphy_reg);
1555                 }
1556
1557                 /* the bw essential for transmitting 16 long packets containing
1558                  * 252 bytes meant for dcs write memory command is programmed in
1559                  * this register in terms of byte clocks. based on dsi transfer
1560                  * rate and the number of lanes configured the time taken to
1561                  * transmit 16 long packets in a dsi stream varies. */
1562                 I915_WRITE(MIPI_DBI_BW_CTRL(port), intel_dsi->bw_timer);
1563
1564                 I915_WRITE(MIPI_CLK_LANE_SWITCH_TIME_CNT(port),
1565                 intel_dsi->clk_lp_to_hs_count << LP_HS_SSW_CNT_SHIFT |
1566                 intel_dsi->clk_hs_to_lp_count << HS_LP_PWR_SW_CNT_SHIFT);
1567
1568                 if (is_vid_mode(intel_dsi))
1569                         /* Some panels might have resolution which is not a
1570                          * multiple of 64 like 1366 x 768. Enable RANDOM
1571                          * resolution support for such panels by default */
1572                         I915_WRITE(MIPI_VIDEO_MODE_FORMAT(port),
1573                                 intel_dsi->video_frmt_cfg_bits |
1574                                 intel_dsi->video_mode_format |
1575                                 IP_TG_CONFIG |
1576                                 RANDOM_DPI_DISPLAY_RESOLUTION);
1577         }
1578 }
1579
1580 static void intel_dsi_unprepare(struct intel_encoder *encoder)
1581 {
1582         struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
1583         struct intel_dsi *intel_dsi = enc_to_intel_dsi(&encoder->base);
1584         enum port port;
1585         u32 val;
1586
1587         if (!IS_GEMINILAKE(dev_priv)) {
1588                 for_each_dsi_port(port, intel_dsi->ports) {
1589                         /* Panel commands can be sent when clock is in LP11 */
1590                         I915_WRITE(MIPI_DEVICE_READY(port), 0x0);
1591
1592                         intel_dsi_reset_clocks(encoder, port);
1593                         I915_WRITE(MIPI_EOT_DISABLE(port), CLOCKSTOP);
1594
1595                         val = I915_READ(MIPI_DSI_FUNC_PRG(port));
1596                         val &= ~VID_MODE_FORMAT_MASK;
1597                         I915_WRITE(MIPI_DSI_FUNC_PRG(port), val);
1598
1599                         I915_WRITE(MIPI_DEVICE_READY(port), 0x1);
1600                 }
1601         }
1602 }
1603
1604 static int intel_dsi_get_modes(struct drm_connector *connector)
1605 {
1606         struct intel_connector *intel_connector = to_intel_connector(connector);
1607         struct drm_display_mode *mode;
1608
1609         DRM_DEBUG_KMS("\n");
1610
1611         if (!intel_connector->panel.fixed_mode) {
1612                 DRM_DEBUG_KMS("no fixed mode\n");
1613                 return 0;
1614         }
1615
1616         mode = drm_mode_duplicate(connector->dev,
1617                                   intel_connector->panel.fixed_mode);
1618         if (!mode) {
1619                 DRM_DEBUG_KMS("drm_mode_duplicate failed\n");
1620                 return 0;
1621         }
1622
1623         drm_mode_probed_add(connector, mode);
1624         return 1;
1625 }
1626
1627 static void intel_dsi_connector_destroy(struct drm_connector *connector)
1628 {
1629         struct intel_connector *intel_connector = to_intel_connector(connector);
1630
1631         DRM_DEBUG_KMS("\n");
1632         intel_panel_fini(&intel_connector->panel);
1633         drm_connector_cleanup(connector);
1634         kfree(connector);
1635 }
1636
1637 static void intel_dsi_encoder_destroy(struct drm_encoder *encoder)
1638 {
1639         struct intel_dsi *intel_dsi = enc_to_intel_dsi(encoder);
1640
1641         /* dispose of the gpios */
1642         if (intel_dsi->gpio_panel)
1643                 gpiod_put(intel_dsi->gpio_panel);
1644
1645         intel_encoder_destroy(encoder);
1646 }
1647
1648 static const struct drm_encoder_funcs intel_dsi_funcs = {
1649         .destroy = intel_dsi_encoder_destroy,
1650 };
1651
1652 static const struct drm_connector_helper_funcs intel_dsi_connector_helper_funcs = {
1653         .get_modes = intel_dsi_get_modes,
1654         .mode_valid = intel_dsi_mode_valid,
1655         .atomic_check = intel_digital_connector_atomic_check,
1656 };
1657
1658 static const struct drm_connector_funcs intel_dsi_connector_funcs = {
1659         .late_register = intel_connector_register,
1660         .early_unregister = intel_connector_unregister,
1661         .destroy = intel_dsi_connector_destroy,
1662         .fill_modes = drm_helper_probe_single_connector_modes,
1663         .atomic_get_property = intel_digital_connector_atomic_get_property,
1664         .atomic_set_property = intel_digital_connector_atomic_set_property,
1665         .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
1666         .atomic_duplicate_state = intel_digital_connector_duplicate_state,
1667 };
1668
1669 static int intel_dsi_get_panel_orientation(struct intel_connector *connector)
1670 {
1671         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1672         int orientation = DRM_MODE_PANEL_ORIENTATION_NORMAL;
1673         enum plane plane;
1674         u32 val;
1675
1676         if (IS_VALLEYVIEW(dev_priv) || IS_CHERRYVIEW(dev_priv)) {
1677                 if (connector->encoder->crtc_mask == BIT(PIPE_B))
1678                         plane = PLANE_B;
1679                 else
1680                         plane = PLANE_A;
1681
1682                 val = I915_READ(DSPCNTR(plane));
1683                 if (val & DISPPLANE_ROTATE_180)
1684                         orientation = DRM_MODE_PANEL_ORIENTATION_BOTTOM_UP;
1685         }
1686
1687         return orientation;
1688 }
1689
1690 static void intel_dsi_add_properties(struct intel_connector *connector)
1691 {
1692         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
1693
1694         if (connector->panel.fixed_mode) {
1695                 u32 allowed_scalers;
1696
1697                 allowed_scalers = BIT(DRM_MODE_SCALE_ASPECT) | BIT(DRM_MODE_SCALE_FULLSCREEN);
1698                 if (!HAS_GMCH_DISPLAY(dev_priv))
1699                         allowed_scalers |= BIT(DRM_MODE_SCALE_CENTER);
1700
1701                 drm_connector_attach_scaling_mode_property(&connector->base,
1702                                                                 allowed_scalers);
1703
1704                 connector->base.state->scaling_mode = DRM_MODE_SCALE_ASPECT;
1705
1706                 connector->base.display_info.panel_orientation =
1707                         intel_dsi_get_panel_orientation(connector);
1708                 drm_connector_init_panel_orientation_property(
1709                                 &connector->base,
1710                                 connector->panel.fixed_mode->hdisplay,
1711                                 connector->panel.fixed_mode->vdisplay);
1712         }
1713 }
1714
1715 void intel_dsi_init(struct drm_i915_private *dev_priv)
1716 {
1717         struct drm_device *dev = &dev_priv->drm;
1718         struct intel_dsi *intel_dsi;
1719         struct intel_encoder *intel_encoder;
1720         struct drm_encoder *encoder;
1721         struct intel_connector *intel_connector;
1722         struct drm_connector *connector;
1723         struct drm_display_mode *scan, *fixed_mode = NULL;
1724         enum port port;
1725
1726         DRM_DEBUG_KMS("\n");
1727
1728         /* There is no detection method for MIPI so rely on VBT */
1729         if (!intel_bios_is_dsi_present(dev_priv, &port))
1730                 return;
1731
1732         if (IS_VALLEYVIEW(dev_priv) || IS_CHERRYVIEW(dev_priv)) {
1733                 dev_priv->mipi_mmio_base = VLV_MIPI_BASE;
1734         } else if (IS_GEN9_LP(dev_priv)) {
1735                 dev_priv->mipi_mmio_base = BXT_MIPI_BASE;
1736         } else {
1737                 DRM_ERROR("Unsupported Mipi device to reg base");
1738                 return;
1739         }
1740
1741         intel_dsi = kzalloc(sizeof(*intel_dsi), GFP_KERNEL);
1742         if (!intel_dsi)
1743                 return;
1744
1745         intel_connector = intel_connector_alloc();
1746         if (!intel_connector) {
1747                 kfree(intel_dsi);
1748                 return;
1749         }
1750
1751         intel_encoder = &intel_dsi->base;
1752         encoder = &intel_encoder->base;
1753         intel_dsi->attached_connector = intel_connector;
1754
1755         connector = &intel_connector->base;
1756
1757         drm_encoder_init(dev, encoder, &intel_dsi_funcs, DRM_MODE_ENCODER_DSI,
1758                          "DSI %c", port_name(port));
1759
1760         intel_encoder->compute_config = intel_dsi_compute_config;
1761         intel_encoder->pre_enable = intel_dsi_pre_enable;
1762         intel_encoder->enable = intel_dsi_enable_nop;
1763         intel_encoder->disable = intel_dsi_disable;
1764         intel_encoder->post_disable = intel_dsi_post_disable;
1765         intel_encoder->get_hw_state = intel_dsi_get_hw_state;
1766         intel_encoder->get_config = intel_dsi_get_config;
1767
1768         intel_connector->get_hw_state = intel_connector_get_hw_state;
1769
1770         intel_encoder->port = port;
1771
1772         /*
1773          * On BYT/CHV, pipe A maps to MIPI DSI port A, pipe B maps to MIPI DSI
1774          * port C. BXT isn't limited like this.
1775          */
1776         if (IS_GEN9_LP(dev_priv))
1777                 intel_encoder->crtc_mask = BIT(PIPE_A) | BIT(PIPE_B) | BIT(PIPE_C);
1778         else if (port == PORT_A)
1779                 intel_encoder->crtc_mask = BIT(PIPE_A);
1780         else
1781                 intel_encoder->crtc_mask = BIT(PIPE_B);
1782
1783         if (dev_priv->vbt.dsi.config->dual_link)
1784                 intel_dsi->ports = BIT(PORT_A) | BIT(PORT_C);
1785         else
1786                 intel_dsi->ports = BIT(port);
1787
1788         intel_dsi->dcs_backlight_ports = dev_priv->vbt.dsi.bl_ports;
1789         intel_dsi->dcs_cabc_ports = dev_priv->vbt.dsi.cabc_ports;
1790
1791         /* Create a DSI host (and a device) for each port. */
1792         for_each_dsi_port(port, intel_dsi->ports) {
1793                 struct intel_dsi_host *host;
1794
1795                 host = intel_dsi_host_init(intel_dsi, port);
1796                 if (!host)
1797                         goto err;
1798
1799                 intel_dsi->dsi_hosts[port] = host;
1800         }
1801
1802         if (!intel_dsi_vbt_init(intel_dsi, MIPI_DSI_GENERIC_PANEL_ID)) {
1803                 DRM_DEBUG_KMS("no device found\n");
1804                 goto err;
1805         }
1806
1807         /*
1808          * In case of BYT with CRC PMIC, we need to use GPIO for
1809          * Panel control.
1810          */
1811         if ((IS_VALLEYVIEW(dev_priv) || IS_CHERRYVIEW(dev_priv)) &&
1812             (dev_priv->vbt.dsi.config->pwm_blc == PPS_BLC_PMIC)) {
1813                 intel_dsi->gpio_panel =
1814                         gpiod_get(dev->dev, "panel", GPIOD_OUT_HIGH);
1815
1816                 if (IS_ERR(intel_dsi->gpio_panel)) {
1817                         DRM_ERROR("Failed to own gpio for panel control\n");
1818                         intel_dsi->gpio_panel = NULL;
1819                 }
1820         }
1821
1822         intel_encoder->type = INTEL_OUTPUT_DSI;
1823         intel_encoder->power_domain = POWER_DOMAIN_PORT_DSI;
1824         intel_encoder->cloneable = 0;
1825         drm_connector_init(dev, connector, &intel_dsi_connector_funcs,
1826                            DRM_MODE_CONNECTOR_DSI);
1827
1828         drm_connector_helper_add(connector, &intel_dsi_connector_helper_funcs);
1829
1830         connector->display_info.subpixel_order = SubPixelHorizontalRGB; /*XXX*/
1831         connector->interlace_allowed = false;
1832         connector->doublescan_allowed = false;
1833
1834         intel_connector_attach_encoder(intel_connector, intel_encoder);
1835
1836         mutex_lock(&dev->mode_config.mutex);
1837         intel_dsi_vbt_get_modes(intel_dsi);
1838         list_for_each_entry(scan, &connector->probed_modes, head) {
1839                 if ((scan->type & DRM_MODE_TYPE_PREFERRED)) {
1840                         fixed_mode = drm_mode_duplicate(dev, scan);
1841                         break;
1842                 }
1843         }
1844         mutex_unlock(&dev->mode_config.mutex);
1845
1846         if (!fixed_mode) {
1847                 DRM_DEBUG_KMS("no fixed mode\n");
1848                 goto err;
1849         }
1850
1851         connector->display_info.width_mm = fixed_mode->width_mm;
1852         connector->display_info.height_mm = fixed_mode->height_mm;
1853
1854         intel_panel_init(&intel_connector->panel, fixed_mode, NULL, NULL);
1855         intel_panel_setup_backlight(connector, INVALID_PIPE);
1856
1857         intel_dsi_add_properties(intel_connector);
1858
1859         return;
1860
1861 err:
1862         drm_encoder_cleanup(&intel_encoder->base);
1863         kfree(intel_dsi);
1864         kfree(intel_connector);
1865 }