drivers/gpu/drm/i915/intel_dvo.c

   1 /*
   2  * Copyright 2006 Dave Airlie <airlied@linux.ie>
   3  * Copyright © 2006-2007 Intel Corporation
   4  *
   5  * Permission is hereby granted, free of charge, to any person obtaining a
   6  * copy of this software and associated documentation files (the "Software"),
   7  * to deal in the Software without restriction, including without limitation
   8  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   9  * and/or sell copies of the Software, and to permit persons to whom the
  10  * Software is furnished to do so, subject to the following conditions:
  11  *
  12  * The above copyright notice and this permission notice (including the next
  13  * paragraph) shall be included in all copies or substantial portions of the
  14  * Software.
  15  *
  16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  19  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  20  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  21  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
  22  * DEALINGS IN THE SOFTWARE.
  23  *
  24  * Authors:
  25  *      Eric Anholt <eric@anholt.net>
  26  */
  27 #include <linux/i2c.h>
  28 #include <linux/slab.h>
  29 #include "drmP.h"
  30 #include "drm.h"
  31 #include "drm_crtc.h"
  32 #include "intel_drv.h"
  33 #include "i915_drm.h"
  34 #include "i915_drv.h"
  35 #include "dvo.h"
  36
  37 #define SIL164_ADDR     0x38
  38 #define CH7xxx_ADDR     0x76
  39 #define TFP410_ADDR     0x38
  40
  41 static struct intel_dvo_device intel_dvo_devices[] = {
  42         {
  43                 .type = INTEL_DVO_CHIP_TMDS,
  44                 .name = "sil164",
  45                 .dvo_reg = DVOC,
  46                 .slave_addr = SIL164_ADDR,
  47                 .dev_ops = &sil164_ops,
  48         },
  49         {
  50                 .type = INTEL_DVO_CHIP_TMDS,
  51                 .name = "ch7xxx",
  52                 .dvo_reg = DVOC,
  53                 .slave_addr = CH7xxx_ADDR,
  54                 .dev_ops = &ch7xxx_ops,
  55         },
  56         {
  57                 .type = INTEL_DVO_CHIP_LVDS,
  58                 .name = "ivch",
  59                 .dvo_reg = DVOA,
  60                 .slave_addr = 0x02, /* Might also be 0x44, 0x84, 0xc4 */
  61                 .dev_ops = &ivch_ops,
  62         },
  63         {
  64                 .type = INTEL_DVO_CHIP_TMDS,
  65                 .name = "tfp410",
  66                 .dvo_reg = DVOC,
  67                 .slave_addr = TFP410_ADDR,
  68                 .dev_ops = &tfp410_ops,
  69         },
  70         {
  71                 .type = INTEL_DVO_CHIP_LVDS,
  72                 .name = "ch7017",
  73                 .dvo_reg = DVOC,
  74                 .slave_addr = 0x75,
  75                 .gpio = GPIOE,
  76                 .dev_ops = &ch7017_ops,
  77         }
  78 };
  79
  80 static void intel_dvo_dpms(struct drm_encoder *encoder, int mode)
  81 {
  82         struct drm_i915_private *dev_priv = encoder->dev->dev_private;
  83         struct intel_encoder *intel_encoder = enc_to_intel_encoder(encoder);
  84         struct intel_dvo_device *dvo = intel_encoder->dev_priv;
  85         u32 dvo_reg = dvo->dvo_reg;
  86         u32 temp = I915_READ(dvo_reg);
  87
  88         if (mode == DRM_MODE_DPMS_ON) {
  89                 I915_WRITE(dvo_reg, temp | DVO_ENABLE);
  90                 I915_READ(dvo_reg);
  91                 dvo->dev_ops->dpms(dvo, mode);
  92         } else {
  93                 dvo->dev_ops->dpms(dvo, mode);
  94                 I915_WRITE(dvo_reg, temp & ~DVO_ENABLE);
  95                 I915_READ(dvo_reg);
  96         }
  97 }
  98
  99 static int intel_dvo_mode_valid(struct drm_connector *connector,
 100                                 struct drm_display_mode *mode)
 101 {
 102         struct drm_encoder *encoder = intel_attached_encoder(connector);
 103         struct intel_encoder *intel_encoder = enc_to_intel_encoder(encoder);
 104         struct intel_dvo_device *dvo = intel_encoder->dev_priv;
 105
 106         if (mode->flags & DRM_MODE_FLAG_DBLSCAN)
 107                 return MODE_NO_DBLESCAN;
 108
 109         /* XXX: Validate clock range */
 110
 111         if (dvo->panel_fixed_mode) {
 112                 if (mode->hdisplay > dvo->panel_fixed_mode->hdisplay)
 113                         return MODE_PANEL;
 114                 if (mode->vdisplay > dvo->panel_fixed_mode->vdisplay)
 115                         return MODE_PANEL;
 116         }
 117
 118         return dvo->dev_ops->mode_valid(dvo, mode);
 119 }
 120
 121 static bool intel_dvo_mode_fixup(struct drm_encoder *encoder,
 122                                  struct drm_display_mode *mode,
 123                                  struct drm_display_mode *adjusted_mode)
 124 {
 125         struct intel_encoder *intel_encoder = enc_to_intel_encoder(encoder);
 126         struct intel_dvo_device *dvo = intel_encoder->dev_priv;
 127
 128         /* If we have timings from the BIOS for the panel, put them in
 129          * to the adjusted mode.  The CRTC will be set up for this mode,
 130          * with the panel scaling set up to source from the H/VDisplay
 131          * of the original mode.
 132          */
 133         if (dvo->panel_fixed_mode != NULL) {
 134 #define C(x) adjusted_mode->x = dvo->panel_fixed_mode->x
 135                 C(hdisplay);
 136                 C(hsync_start);
 137                 C(hsync_end);
 138                 C(htotal);
 139                 C(vdisplay);
 140                 C(vsync_start);
 141                 C(vsync_end);
 142                 C(vtotal);
 143                 C(clock);
 144                 drm_mode_set_crtcinfo(adjusted_mode, CRTC_INTERLACE_HALVE_V);
 145 #undef C
 146         }
 147
 148         if (dvo->dev_ops->mode_fixup)
 149                 return dvo->dev_ops->mode_fixup(dvo, mode, adjusted_mode);
 150
 151         return true;
 152 }
 153
 154 static void intel_dvo_mode_set(struct drm_encoder *encoder,
 155                                struct drm_display_mode *mode,
 156                                struct drm_display_mode *adjusted_mode)
 157 {
 158         struct drm_device *dev = encoder->dev;
 159         struct drm_i915_private *dev_priv = dev->dev_private;
 160         struct intel_crtc *intel_crtc = to_intel_crtc(encoder->crtc);
 161         struct intel_encoder *intel_encoder = enc_to_intel_encoder(encoder);
 162         struct intel_dvo_device *dvo = intel_encoder->dev_priv;
 163         int pipe = intel_crtc->pipe;
 164         u32 dvo_val;
 165         u32 dvo_reg = dvo->dvo_reg, dvo_srcdim_reg;
 166         int dpll_reg = (pipe == 0) ? DPLL_A : DPLL_B;
 167
 168         switch (dvo_reg) {
 169         case DVOA:
 170         default:
 171                 dvo_srcdim_reg = DVOA_SRCDIM;
 172                 break;
 173         case DVOB:
 174                 dvo_srcdim_reg = DVOB_SRCDIM;
 175                 break;
 176         case DVOC:
 177                 dvo_srcdim_reg = DVOC_SRCDIM;
 178                 break;
 179         }
 180
 181         dvo->dev_ops->mode_set(dvo, mode, adjusted_mode);
 182
 183         /* Save the data order, since I don't know what it should be set to. */
 184         dvo_val = I915_READ(dvo_reg) &
 185                   (DVO_PRESERVE_MASK | DVO_DATA_ORDER_GBRG);
 186         dvo_val |= DVO_DATA_ORDER_FP | DVO_BORDER_ENABLE |
 187                    DVO_BLANK_ACTIVE_HIGH;
 188
 189         if (pipe == 1)
 190                 dvo_val |= DVO_PIPE_B_SELECT;
 191         dvo_val |= DVO_PIPE_STALL;
 192         if (adjusted_mode->flags & DRM_MODE_FLAG_PHSYNC)
 193                 dvo_val |= DVO_HSYNC_ACTIVE_HIGH;
 194         if (adjusted_mode->flags & DRM_MODE_FLAG_PVSYNC)
 195                 dvo_val |= DVO_VSYNC_ACTIVE_HIGH;
 196
 197         I915_WRITE(dpll_reg, I915_READ(dpll_reg) | DPLL_DVO_HIGH_SPEED);
 198
 199         /*I915_WRITE(DVOB_SRCDIM,
 200           (adjusted_mode->hdisplay << DVO_SRCDIM_HORIZONTAL_SHIFT) |
 201           (adjusted_mode->VDisplay << DVO_SRCDIM_VERTICAL_SHIFT));*/
 202         I915_WRITE(dvo_srcdim_reg,
 203                    (adjusted_mode->hdisplay << DVO_SRCDIM_HORIZONTAL_SHIFT) |
 204                    (adjusted_mode->vdisplay << DVO_SRCDIM_VERTICAL_SHIFT));
 205         /*I915_WRITE(DVOB, dvo_val);*/
 206         I915_WRITE(dvo_reg, dvo_val);
 207 }
 208
 209 /**
 210  * Detect the output connection on our DVO device.
 211  *
 212  * Unimplemented.
 213  */
 214 static enum drm_connector_status intel_dvo_detect(struct drm_connector *connector)
 215 {
 216         struct drm_encoder *encoder = intel_attached_encoder(connector);
 217         struct intel_encoder *intel_encoder = enc_to_intel_encoder(encoder);
 218         struct intel_dvo_device *dvo = intel_encoder->dev_priv;
 219
 220         return dvo->dev_ops->detect(dvo);
 221 }
 222
 223 static int intel_dvo_get_modes(struct drm_connector *connector)
 224 {
 225         struct drm_encoder *encoder = intel_attached_encoder(connector);
 226         struct intel_encoder *intel_encoder = enc_to_intel_encoder(encoder);
 227         struct intel_dvo_device *dvo = intel_encoder->dev_priv;
 228
 229         /* We should probably have an i2c driver get_modes function for those
 230          * devices which will have a fixed set of modes determined by the chip
 231          * (TV-out, for example), but for now with just TMDS and LVDS,
 232          * that's not the case.
 233          */
 234         intel_ddc_get_modes(connector, intel_encoder->ddc_bus);
 235         if (!list_empty(&connector->probed_modes))
 236                 return 1;
 237
 238
 239         if (dvo->panel_fixed_mode != NULL) {
 240                 struct drm_display_mode *mode;
 241                 mode = drm_mode_duplicate(connector->dev, dvo->panel_fixed_mode);
 242                 if (mode) {
 243                         drm_mode_probed_add(connector, mode);
 244                         return 1;
 245                 }
 246         }
 247         return 0;
 248 }
 249
 250 static void intel_dvo_destroy (struct drm_connector *connector)
 251 {
 252         drm_sysfs_connector_remove(connector);
 253         drm_connector_cleanup(connector);
 254         kfree(connector);
 255 }
 256
 257 static const struct drm_encoder_helper_funcs intel_dvo_helper_funcs = {
 258         .dpms = intel_dvo_dpms,
 259         .mode_fixup = intel_dvo_mode_fixup,
 260         .prepare = intel_encoder_prepare,
 261         .mode_set = intel_dvo_mode_set,
 262         .commit = intel_encoder_commit,
 263 };
 264
 265 static const struct drm_connector_funcs intel_dvo_connector_funcs = {
 266         .dpms = drm_helper_connector_dpms,
 267         .detect = intel_dvo_detect,
 268         .destroy = intel_dvo_destroy,
 269         .fill_modes = drm_helper_probe_single_connector_modes,
 270 };
 271
 272 static const struct drm_connector_helper_funcs intel_dvo_connector_helper_funcs = {
 273         .mode_valid = intel_dvo_mode_valid,
 274         .get_modes = intel_dvo_get_modes,
 275         .best_encoder = intel_attached_encoder,
 276 };
 277
 278 static void intel_dvo_enc_destroy(struct drm_encoder *encoder)
 279 {
 280         struct intel_encoder *intel_encoder = enc_to_intel_encoder(encoder);
 281         struct intel_dvo_device *dvo = intel_encoder->dev_priv;
 282
 283         if (dvo) {
 284                 if (dvo->dev_ops->destroy)
 285                         dvo->dev_ops->destroy(dvo);
 286                 if (dvo->panel_fixed_mode)
 287                         kfree(dvo->panel_fixed_mode);
 288         }
 289         if (intel_encoder->i2c_bus)
 290                 intel_i2c_destroy(intel_encoder->i2c_bus);
 291         if (intel_encoder->ddc_bus)
 292                 intel_i2c_destroy(intel_encoder->ddc_bus);
 293         drm_encoder_cleanup(encoder);
 294         kfree(intel_encoder);
 295 }
 296
 297 static const struct drm_encoder_funcs intel_dvo_enc_funcs = {
 298         .destroy = intel_dvo_enc_destroy,
 299 };
 300
 301
 302 /**
 303  * Attempts to get a fixed panel timing for LVDS (currently only the i830).
 304  *
 305  * Other chips with DVO LVDS will need to extend this to deal with the LVDS
 306  * chip being on DVOB/C and having multiple pipes.
 307  */
 308 static struct drm_display_mode *
 309 intel_dvo_get_current_mode (struct drm_connector *connector)
 310 {
 311         struct drm_device *dev = connector->dev;
 312         struct drm_i915_private *dev_priv = dev->dev_private;
 313         struct drm_encoder *encoder = intel_attached_encoder(connector);
 314         struct intel_encoder *intel_encoder = enc_to_intel_encoder(encoder);
 315         struct intel_dvo_device *dvo = intel_encoder->dev_priv;
 316         uint32_t dvo_reg = dvo->dvo_reg;
 317         uint32_t dvo_val = I915_READ(dvo_reg);
 318         struct drm_display_mode *mode = NULL;
 319
 320         /* If the DVO port is active, that'll be the LVDS, so we can pull out
 321          * its timings to get how the BIOS set up the panel.
 322          */
 323         if (dvo_val & DVO_ENABLE) {
 324                 struct drm_crtc *crtc;
 325                 int pipe = (dvo_val & DVO_PIPE_B_SELECT) ? 1 : 0;
 326
 327                 crtc = intel_get_crtc_from_pipe(dev, pipe);
 328                 if (crtc) {
 329                         mode = intel_crtc_mode_get(dev, crtc);
 330
 331                         if (mode) {
 332                                 mode->type |= DRM_MODE_TYPE_PREFERRED;
 333                                 if (dvo_val & DVO_HSYNC_ACTIVE_HIGH)
 334                                         mode->flags |= DRM_MODE_FLAG_PHSYNC;
 335                                 if (dvo_val & DVO_VSYNC_ACTIVE_HIGH)
 336                                         mode->flags |= DRM_MODE_FLAG_PVSYNC;
 337                         }
 338                 }
 339         }
 340         return mode;
 341 }
 342
 343 void intel_dvo_init(struct drm_device *dev)
 344 {
 345         struct intel_encoder *intel_encoder;
 346         struct intel_connector *intel_connector;
 347         struct intel_dvo_device *dvo;
 348         struct i2c_adapter *i2cbus = NULL;
 349         int ret = 0;
 350         int i;
 351         int encoder_type = DRM_MODE_ENCODER_NONE;
 352         intel_encoder = kzalloc (sizeof(struct intel_encoder), GFP_KERNEL);
 353         if (!intel_encoder)
 354                 return;
 355
 356         intel_connector = kzalloc(sizeof(struct intel_connector), GFP_KERNEL);
 357         if (!intel_connector) {
 358                 kfree(intel_encoder);
 359                 return;
 360         }
 361
 362         /* Set up the DDC bus */
 363         intel_encoder->ddc_bus = intel_i2c_create(dev, GPIOD, "DVODDC_D");
 364         if (!intel_encoder->ddc_bus)
 365                 goto free_intel;
 366
 367         /* Now, try to find a controller */
 368         for (i = 0; i < ARRAY_SIZE(intel_dvo_devices); i++) {
 369                 struct drm_connector *connector = &intel_connector->base;
 370                 int gpio;
 371
 372                 dvo = &intel_dvo_devices[i];
 373
 374                 /* Allow the I2C driver info to specify the GPIO to be used in
 375                  * special cases, but otherwise default to what's defined
 376                  * in the spec.
 377                  */
 378                 if (dvo->gpio != 0)
 379                         gpio = dvo->gpio;
 380                 else if (dvo->type == INTEL_DVO_CHIP_LVDS)
 381                         gpio = GPIOB;
 382                 else
 383                         gpio = GPIOE;
 384
 385                 /* Set up the I2C bus necessary for the chip we're probing.
 386                  * It appears that everything is on GPIOE except for panels
 387                  * on i830 laptops, which are on GPIOB (DVOA).
 388                  */
 389                 if (i2cbus != NULL)
 390                         intel_i2c_destroy(i2cbus);
 391                 if (!(i2cbus = intel_i2c_create(dev, gpio,
 392                         gpio == GPIOB ? "DVOI2C_B" : "DVOI2C_E"))) {
 393                         continue;
 394                 }
 395
 396                 if (dvo->dev_ops!= NULL)
 397                         ret = dvo->dev_ops->init(dvo, i2cbus);
 398                 else
 399                         ret = false;
 400
 401                 if (!ret)
 402                         continue;
 403
 404                 intel_encoder->type = INTEL_OUTPUT_DVO;
 405                 intel_encoder->crtc_mask = (1 << 0) | (1 << 1);
 406                 switch (dvo->type) {
 407                 case INTEL_DVO_CHIP_TMDS:
 408                         intel_encoder->clone_mask =
 409                                 (1 << INTEL_DVO_TMDS_CLONE_BIT) |
 410                                 (1 << INTEL_ANALOG_CLONE_BIT);
 411                         drm_connector_init(dev, connector,
 412                                            &intel_dvo_connector_funcs,
 413                                            DRM_MODE_CONNECTOR_DVII);
 414                         encoder_type = DRM_MODE_ENCODER_TMDS;
 415                         break;
 416                 case INTEL_DVO_CHIP_LVDS:
 417                         intel_encoder->clone_mask =
 418                                 (1 << INTEL_DVO_LVDS_CLONE_BIT);
 419                         drm_connector_init(dev, connector,
 420                                            &intel_dvo_connector_funcs,
 421                                            DRM_MODE_CONNECTOR_LVDS);
 422                         encoder_type = DRM_MODE_ENCODER_LVDS;
 423                         break;
 424                 }
 425
 426                 drm_connector_helper_add(connector,
 427                                          &intel_dvo_connector_helper_funcs);
 428                 connector->display_info.subpixel_order = SubPixelHorizontalRGB;
 429                 connector->interlace_allowed = false;
 430                 connector->doublescan_allowed = false;
 431
 432                 intel_encoder->dev_priv = dvo;
 433                 intel_encoder->i2c_bus = i2cbus;
 434
 435                 drm_encoder_init(dev, &intel_encoder->enc,
 436                                  &intel_dvo_enc_funcs, encoder_type);
 437                 drm_encoder_helper_add(&intel_encoder->enc,
 438                                        &intel_dvo_helper_funcs);
 439
 440                 drm_mode_connector_attach_encoder(&intel_connector->base,
 441                                                   &intel_encoder->enc);
 442                 if (dvo->type == INTEL_DVO_CHIP_LVDS) {
 443                         /* For our LVDS chipsets, we should hopefully be able
 444                          * to dig the fixed panel mode out of the BIOS data.
 445                          * However, it's in a different format from the BIOS
 446                          * data on chipsets with integrated LVDS (stored in AIM
 447                          * headers, likely), so for now, just get the current
 448                          * mode being output through DVO.
 449                          */
 450                         dvo->panel_fixed_mode =
 451                                 intel_dvo_get_current_mode(connector);
 452                         dvo->panel_wants_dither = true;
 453                 }
 454
 455                 drm_sysfs_connector_add(connector);
 456                 return;
 457         }
 458
 459         intel_i2c_destroy(intel_encoder->ddc_bus);
 460         /* Didn't find a chip, so tear down. */
 461         if (i2cbus != NULL)
 462                 intel_i2c_destroy(i2cbus);
 463 free_intel:
 464         kfree(intel_encoder);
 465         kfree(intel_connector);
 466 }