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 <drm/drmP.h>
  30 #include <drm/drm_crtc.h>
  31 #include "intel_drv.h"
  32 #include <drm/i915_drm.h>
  33 #include "i915_drv.h"
  34 #include "dvo.h"
  35
  36 #define SIL164_ADDR     0x38
  37 #define CH7xxx_ADDR     0x76
  38 #define TFP410_ADDR     0x38
  39 #define NS2501_ADDR     0x38
  40
  41 static const 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_TMDS,
  58                 .name = "ch7xxx",
  59                 .dvo_reg = DVOC,
  60                 .slave_addr = 0x75, /* For some ch7010 */
  61                 .dev_ops = &ch7xxx_ops,
  62         },
  63         {
  64                 .type = INTEL_DVO_CHIP_LVDS,
  65                 .name = "ivch",
  66                 .dvo_reg = DVOA,
  67                 .slave_addr = 0x02, /* Might also be 0x44, 0x84, 0xc4 */
  68                 .dev_ops = &ivch_ops,
  69         },
  70         {
  71                 .type = INTEL_DVO_CHIP_TMDS,
  72                 .name = "tfp410",
  73                 .dvo_reg = DVOC,
  74                 .slave_addr = TFP410_ADDR,
  75                 .dev_ops = &tfp410_ops,
  76         },
  77         {
  78                 .type = INTEL_DVO_CHIP_LVDS,
  79                 .name = "ch7017",
  80                 .dvo_reg = DVOC,
  81                 .slave_addr = 0x75,
  82                 .gpio = GMBUS_PORT_DPB,
  83                 .dev_ops = &ch7017_ops,
  84         },
  85         {
  86                 .type = INTEL_DVO_CHIP_TMDS,
  87                 .name = "ns2501",
  88                 .dvo_reg = DVOC,
  89                 .slave_addr = NS2501_ADDR,
  90                 .dev_ops = &ns2501_ops,
  91        }
  92 };
  93
  94 struct intel_dvo {
  95         struct intel_encoder base;
  96
  97         struct intel_dvo_device dev;
  98
  99         struct drm_display_mode *panel_fixed_mode;
 100         bool panel_wants_dither;
 101 };
 102
 103 static struct intel_dvo *enc_to_dvo(struct intel_encoder *encoder)
 104 {
 105         return container_of(encoder, struct intel_dvo, base);
 106 }
 107
 108 static struct intel_dvo *intel_attached_dvo(struct drm_connector *connector)
 109 {
 110         return enc_to_dvo(intel_attached_encoder(connector));
 111 }
 112
 113 static bool intel_dvo_connector_get_hw_state(struct intel_connector *connector)
 114 {
 115         struct intel_dvo *intel_dvo = intel_attached_dvo(&connector->base);
 116
 117         return intel_dvo->dev.dev_ops->get_hw_state(&intel_dvo->dev);
 118 }
 119
 120 static bool intel_dvo_get_hw_state(struct intel_encoder *encoder,
 121                                    enum pipe *pipe)
 122 {
 123         struct drm_device *dev = encoder->base.dev;
 124         struct drm_i915_private *dev_priv = dev->dev_private;
 125         struct intel_dvo *intel_dvo = enc_to_dvo(encoder);
 126         u32 tmp;
 127
 128         tmp = I915_READ(intel_dvo->dev.dvo_reg);
 129
 130         if (!(tmp & DVO_ENABLE))
 131                 return false;
 132
 133         *pipe = PORT_TO_PIPE(tmp);
 134
 135         return true;
 136 }
 137
 138 static void intel_dvo_get_config(struct intel_encoder *encoder,
 139                                  struct intel_crtc_config *pipe_config)
 140 {
 141         struct drm_i915_private *dev_priv = encoder->base.dev->dev_private;
 142         struct intel_dvo *intel_dvo = enc_to_dvo(encoder);
 143         u32 tmp, flags = 0;
 144
 145         tmp = I915_READ(intel_dvo->dev.dvo_reg);
 146         if (tmp & DVO_HSYNC_ACTIVE_HIGH)
 147                 flags |= DRM_MODE_FLAG_PHSYNC;
 148         else
 149                 flags |= DRM_MODE_FLAG_NHSYNC;
 150         if (tmp & DVO_VSYNC_ACTIVE_HIGH)
 151                 flags |= DRM_MODE_FLAG_PVSYNC;
 152         else
 153                 flags |= DRM_MODE_FLAG_NVSYNC;
 154
 155         pipe_config->adjusted_mode.flags |= flags;
 156 }
 157
 158 static void intel_disable_dvo(struct intel_encoder *encoder)
 159 {
 160         struct drm_i915_private *dev_priv = encoder->base.dev->dev_private;
 161         struct intel_dvo *intel_dvo = enc_to_dvo(encoder);
 162         u32 dvo_reg = intel_dvo->dev.dvo_reg;
 163         u32 temp = I915_READ(dvo_reg);
 164
 165         intel_dvo->dev.dev_ops->dpms(&intel_dvo->dev, false);
 166         I915_WRITE(dvo_reg, temp & ~DVO_ENABLE);
 167         I915_READ(dvo_reg);
 168 }
 169
 170 static void intel_enable_dvo(struct intel_encoder *encoder)
 171 {
 172         struct drm_i915_private *dev_priv = encoder->base.dev->dev_private;
 173         struct intel_dvo *intel_dvo = enc_to_dvo(encoder);
 174         u32 dvo_reg = intel_dvo->dev.dvo_reg;
 175         u32 temp = I915_READ(dvo_reg);
 176
 177         I915_WRITE(dvo_reg, temp | DVO_ENABLE);
 178         I915_READ(dvo_reg);
 179         intel_dvo->dev.dev_ops->dpms(&intel_dvo->dev, true);
 180 }
 181
 182 /* Special dpms function to support cloning between dvo/sdvo/crt. */
 183 static void intel_dvo_dpms(struct drm_connector *connector, int mode)
 184 {
 185         struct intel_dvo *intel_dvo = intel_attached_dvo(connector);
 186         struct drm_crtc *crtc;
 187
 188         /* dvo supports only 2 dpms states. */
 189         if (mode != DRM_MODE_DPMS_ON)
 190                 mode = DRM_MODE_DPMS_OFF;
 191
 192         if (mode == connector->dpms)
 193                 return;
 194
 195         connector->dpms = mode;
 196
 197         /* Only need to change hw state when actually enabled */
 198         crtc = intel_dvo->base.base.crtc;
 199         if (!crtc) {
 200                 intel_dvo->base.connectors_active = false;
 201                 return;
 202         }
 203
 204         /* We call connector dpms manually below in case pipe dpms doesn't
 205          * change due to cloning. */
 206         if (mode == DRM_MODE_DPMS_ON) {
 207                 intel_dvo->base.connectors_active = true;
 208
 209                 intel_crtc_update_dpms(crtc);
 210
 211                 intel_dvo->dev.dev_ops->dpms(&intel_dvo->dev, true);
 212         } else {
 213                 intel_dvo->dev.dev_ops->dpms(&intel_dvo->dev, false);
 214
 215                 intel_dvo->base.connectors_active = false;
 216
 217                 intel_crtc_update_dpms(crtc);
 218         }
 219
 220         intel_modeset_check_state(connector->dev);
 221 }
 222
 223 static int intel_dvo_mode_valid(struct drm_connector *connector,
 224                                 struct drm_display_mode *mode)
 225 {
 226         struct intel_dvo *intel_dvo = intel_attached_dvo(connector);
 227
 228         if (mode->flags & DRM_MODE_FLAG_DBLSCAN)
 229                 return MODE_NO_DBLESCAN;
 230
 231         /* XXX: Validate clock range */
 232
 233         if (intel_dvo->panel_fixed_mode) {
 234                 if (mode->hdisplay > intel_dvo->panel_fixed_mode->hdisplay)
 235                         return MODE_PANEL;
 236                 if (mode->vdisplay > intel_dvo->panel_fixed_mode->vdisplay)
 237                         return MODE_PANEL;
 238         }
 239
 240         return intel_dvo->dev.dev_ops->mode_valid(&intel_dvo->dev, mode);
 241 }
 242
 243 static bool intel_dvo_compute_config(struct intel_encoder *encoder,
 244                                      struct intel_crtc_config *pipe_config)
 245 {
 246         struct intel_dvo *intel_dvo = enc_to_dvo(encoder);
 247         struct drm_display_mode *adjusted_mode = &pipe_config->adjusted_mode;
 248
 249         /* If we have timings from the BIOS for the panel, put them in
 250          * to the adjusted mode.  The CRTC will be set up for this mode,
 251          * with the panel scaling set up to source from the H/VDisplay
 252          * of the original mode.
 253          */
 254         if (intel_dvo->panel_fixed_mode != NULL) {
 255 #define C(x) adjusted_mode->x = intel_dvo->panel_fixed_mode->x
 256                 C(hdisplay);
 257                 C(hsync_start);
 258                 C(hsync_end);
 259                 C(htotal);
 260                 C(vdisplay);
 261                 C(vsync_start);
 262                 C(vsync_end);
 263                 C(vtotal);
 264                 C(clock);
 265 #undef C
 266         }
 267
 268         if (intel_dvo->dev.dev_ops->mode_fixup)
 269                 return intel_dvo->dev.dev_ops->mode_fixup(&intel_dvo->dev,
 270                                                           &pipe_config->requested_mode,
 271                                                           adjusted_mode);
 272
 273         return true;
 274 }
 275
 276 static void intel_dvo_mode_set(struct intel_encoder *encoder)
 277 {
 278         struct drm_device *dev = encoder->base.dev;
 279         struct drm_i915_private *dev_priv = dev->dev_private;
 280         struct intel_crtc *crtc = to_intel_crtc(encoder->base.crtc);
 281         struct drm_display_mode *adjusted_mode = &crtc->config.adjusted_mode;
 282         struct intel_dvo *intel_dvo = enc_to_dvo(encoder);
 283         int pipe = crtc->pipe;
 284         u32 dvo_val;
 285         u32 dvo_reg = intel_dvo->dev.dvo_reg, dvo_srcdim_reg;
 286
 287         switch (dvo_reg) {
 288         case DVOA:
 289         default:
 290                 dvo_srcdim_reg = DVOA_SRCDIM;
 291                 break;
 292         case DVOB:
 293                 dvo_srcdim_reg = DVOB_SRCDIM;
 294                 break;
 295         case DVOC:
 296                 dvo_srcdim_reg = DVOC_SRCDIM;
 297                 break;
 298         }
 299
 300         intel_dvo->dev.dev_ops->mode_set(&intel_dvo->dev,
 301                                          &crtc->config.requested_mode,
 302                                          adjusted_mode);
 303
 304         /* Save the data order, since I don't know what it should be set to. */
 305         dvo_val = I915_READ(dvo_reg) &
 306                   (DVO_PRESERVE_MASK | DVO_DATA_ORDER_GBRG);
 307         dvo_val |= DVO_DATA_ORDER_FP | DVO_BORDER_ENABLE |
 308                    DVO_BLANK_ACTIVE_HIGH;
 309
 310         if (pipe == 1)
 311                 dvo_val |= DVO_PIPE_B_SELECT;
 312         dvo_val |= DVO_PIPE_STALL;
 313         if (adjusted_mode->flags & DRM_MODE_FLAG_PHSYNC)
 314                 dvo_val |= DVO_HSYNC_ACTIVE_HIGH;
 315         if (adjusted_mode->flags & DRM_MODE_FLAG_PVSYNC)
 316                 dvo_val |= DVO_VSYNC_ACTIVE_HIGH;
 317
 318         /*I915_WRITE(DVOB_SRCDIM,
 319           (adjusted_mode->hdisplay << DVO_SRCDIM_HORIZONTAL_SHIFT) |
 320           (adjusted_mode->VDisplay << DVO_SRCDIM_VERTICAL_SHIFT));*/
 321         I915_WRITE(dvo_srcdim_reg,
 322                    (adjusted_mode->hdisplay << DVO_SRCDIM_HORIZONTAL_SHIFT) |
 323                    (adjusted_mode->vdisplay << DVO_SRCDIM_VERTICAL_SHIFT));
 324         /*I915_WRITE(DVOB, dvo_val);*/
 325         I915_WRITE(dvo_reg, dvo_val);
 326 }
 327
 328 /**
 329  * Detect the output connection on our DVO device.
 330  *
 331  * Unimplemented.
 332  */
 333 static enum drm_connector_status
 334 intel_dvo_detect(struct drm_connector *connector, bool force)
 335 {
 336         struct intel_dvo *intel_dvo = intel_attached_dvo(connector);
 337         DRM_DEBUG_KMS("[CONNECTOR:%d:%s]\n",
 338                       connector->base.id, drm_get_connector_name(connector));
 339         return intel_dvo->dev.dev_ops->detect(&intel_dvo->dev);
 340 }
 341
 342 static int intel_dvo_get_modes(struct drm_connector *connector)
 343 {
 344         struct intel_dvo *intel_dvo = intel_attached_dvo(connector);
 345         struct drm_i915_private *dev_priv = connector->dev->dev_private;
 346
 347         /* We should probably have an i2c driver get_modes function for those
 348          * devices which will have a fixed set of modes determined by the chip
 349          * (TV-out, for example), but for now with just TMDS and LVDS,
 350          * that's not the case.
 351          */
 352         intel_ddc_get_modes(connector,
 353                             intel_gmbus_get_adapter(dev_priv, GMBUS_PORT_DPC));
 354         if (!list_empty(&connector->probed_modes))
 355                 return 1;
 356
 357         if (intel_dvo->panel_fixed_mode != NULL) {
 358                 struct drm_display_mode *mode;
 359                 mode = drm_mode_duplicate(connector->dev, intel_dvo->panel_fixed_mode);
 360                 if (mode) {
 361                         drm_mode_probed_add(connector, mode);
 362                         return 1;
 363                 }
 364         }
 365
 366         return 0;
 367 }
 368
 369 static void intel_dvo_destroy(struct drm_connector *connector)
 370 {
 371         drm_sysfs_connector_remove(connector);
 372         drm_connector_cleanup(connector);
 373         kfree(connector);
 374 }
 375
 376 static const struct drm_connector_funcs intel_dvo_connector_funcs = {
 377         .dpms = intel_dvo_dpms,
 378         .detect = intel_dvo_detect,
 379         .destroy = intel_dvo_destroy,
 380         .fill_modes = drm_helper_probe_single_connector_modes,
 381 };
 382
 383 static const struct drm_connector_helper_funcs intel_dvo_connector_helper_funcs = {
 384         .mode_valid = intel_dvo_mode_valid,
 385         .get_modes = intel_dvo_get_modes,
 386         .best_encoder = intel_best_encoder,
 387 };
 388
 389 static void intel_dvo_enc_destroy(struct drm_encoder *encoder)
 390 {
 391         struct intel_dvo *intel_dvo = enc_to_dvo(to_intel_encoder(encoder));
 392
 393         if (intel_dvo->dev.dev_ops->destroy)
 394                 intel_dvo->dev.dev_ops->destroy(&intel_dvo->dev);
 395
 396         kfree(intel_dvo->panel_fixed_mode);
 397
 398         intel_encoder_destroy(encoder);
 399 }
 400
 401 static const struct drm_encoder_funcs intel_dvo_enc_funcs = {
 402         .destroy = intel_dvo_enc_destroy,
 403 };
 404
 405 /**
 406  * Attempts to get a fixed panel timing for LVDS (currently only the i830).
 407  *
 408  * Other chips with DVO LVDS will need to extend this to deal with the LVDS
 409  * chip being on DVOB/C and having multiple pipes.
 410  */
 411 static struct drm_display_mode *
 412 intel_dvo_get_current_mode(struct drm_connector *connector)
 413 {
 414         struct drm_device *dev = connector->dev;
 415         struct drm_i915_private *dev_priv = dev->dev_private;
 416         struct intel_dvo *intel_dvo = intel_attached_dvo(connector);
 417         uint32_t dvo_val = I915_READ(intel_dvo->dev.dvo_reg);
 418         struct drm_display_mode *mode = NULL;
 419
 420         /* If the DVO port is active, that'll be the LVDS, so we can pull out
 421          * its timings to get how the BIOS set up the panel.
 422          */
 423         if (dvo_val & DVO_ENABLE) {
 424                 struct drm_crtc *crtc;
 425                 int pipe = (dvo_val & DVO_PIPE_B_SELECT) ? 1 : 0;
 426
 427                 crtc = intel_get_crtc_for_pipe(dev, pipe);
 428                 if (crtc) {
 429                         mode = intel_crtc_mode_get(dev, crtc);
 430                         if (mode) {
 431                                 mode->type |= DRM_MODE_TYPE_PREFERRED;
 432                                 if (dvo_val & DVO_HSYNC_ACTIVE_HIGH)
 433                                         mode->flags |= DRM_MODE_FLAG_PHSYNC;
 434                                 if (dvo_val & DVO_VSYNC_ACTIVE_HIGH)
 435                                         mode->flags |= DRM_MODE_FLAG_PVSYNC;
 436                         }
 437                 }
 438         }
 439
 440         return mode;
 441 }
 442
 443 void intel_dvo_init(struct drm_device *dev)
 444 {
 445         struct drm_i915_private *dev_priv = dev->dev_private;
 446         struct intel_encoder *intel_encoder;
 447         struct intel_dvo *intel_dvo;
 448         struct intel_connector *intel_connector;
 449         int i;
 450         int encoder_type = DRM_MODE_ENCODER_NONE;
 451
 452         intel_dvo = kzalloc(sizeof(struct intel_dvo), GFP_KERNEL);
 453         if (!intel_dvo)
 454                 return;
 455
 456         intel_connector = kzalloc(sizeof(struct intel_connector), GFP_KERNEL);
 457         if (!intel_connector) {
 458                 kfree(intel_dvo);
 459                 return;
 460         }
 461
 462         intel_encoder = &intel_dvo->base;
 463         drm_encoder_init(dev, &intel_encoder->base,
 464                          &intel_dvo_enc_funcs, encoder_type);
 465
 466         intel_encoder->disable = intel_disable_dvo;
 467         intel_encoder->enable = intel_enable_dvo;
 468         intel_encoder->get_hw_state = intel_dvo_get_hw_state;
 469         intel_encoder->get_config = intel_dvo_get_config;
 470         intel_encoder->compute_config = intel_dvo_compute_config;
 471         intel_encoder->mode_set = intel_dvo_mode_set;
 472         intel_connector->get_hw_state = intel_dvo_connector_get_hw_state;
 473
 474         /* Now, try to find a controller */
 475         for (i = 0; i < ARRAY_SIZE(intel_dvo_devices); i++) {
 476                 struct drm_connector *connector = &intel_connector->base;
 477                 const struct intel_dvo_device *dvo = &intel_dvo_devices[i];
 478                 struct i2c_adapter *i2c;
 479                 int gpio;
 480                 bool dvoinit;
 481
 482                 /* Allow the I2C driver info to specify the GPIO to be used in
 483                  * special cases, but otherwise default to what's defined
 484                  * in the spec.
 485                  */
 486                 if (intel_gmbus_is_port_valid(dvo->gpio))
 487                         gpio = dvo->gpio;
 488                 else if (dvo->type == INTEL_DVO_CHIP_LVDS)
 489                         gpio = GMBUS_PORT_SSC;
 490                 else
 491                         gpio = GMBUS_PORT_DPB;
 492
 493                 /* Set up the I2C bus necessary for the chip we're probing.
 494                  * It appears that everything is on GPIOE except for panels
 495                  * on i830 laptops, which are on GPIOB (DVOA).
 496                  */
 497                 i2c = intel_gmbus_get_adapter(dev_priv, gpio);
 498
 499                 intel_dvo->dev = *dvo;
 500
 501                 /* GMBUS NAK handling seems to be unstable, hence let the
 502                  * transmitter detection run in bit banging mode for now.
 503                  */
 504                 intel_gmbus_force_bit(i2c, true);
 505
 506                 dvoinit = dvo->dev_ops->init(&intel_dvo->dev, i2c);
 507
 508                 intel_gmbus_force_bit(i2c, false);
 509
 510                 if (!dvoinit)
 511                         continue;
 512
 513                 intel_encoder->type = INTEL_OUTPUT_DVO;
 514                 intel_encoder->crtc_mask = (1 << 0) | (1 << 1);
 515                 switch (dvo->type) {
 516                 case INTEL_DVO_CHIP_TMDS:
 517                         intel_encoder->cloneable = true;
 518                         drm_connector_init(dev, connector,
 519                                            &intel_dvo_connector_funcs,
 520                                            DRM_MODE_CONNECTOR_DVII);
 521                         encoder_type = DRM_MODE_ENCODER_TMDS;
 522                         break;
 523                 case INTEL_DVO_CHIP_LVDS:
 524                         intel_encoder->cloneable = false;
 525                         drm_connector_init(dev, connector,
 526                                            &intel_dvo_connector_funcs,
 527                                            DRM_MODE_CONNECTOR_LVDS);
 528                         encoder_type = DRM_MODE_ENCODER_LVDS;
 529                         break;
 530                 }
 531
 532                 drm_connector_helper_add(connector,
 533                                          &intel_dvo_connector_helper_funcs);
 534                 connector->display_info.subpixel_order = SubPixelHorizontalRGB;
 535                 connector->interlace_allowed = false;
 536                 connector->doublescan_allowed = false;
 537
 538                 intel_connector_attach_encoder(intel_connector, intel_encoder);
 539                 if (dvo->type == INTEL_DVO_CHIP_LVDS) {
 540                         /* For our LVDS chipsets, we should hopefully be able
 541                          * to dig the fixed panel mode out of the BIOS data.
 542                          * However, it's in a different format from the BIOS
 543                          * data on chipsets with integrated LVDS (stored in AIM
 544                          * headers, likely), so for now, just get the current
 545                          * mode being output through DVO.
 546                          */
 547                         intel_dvo->panel_fixed_mode =
 548                                 intel_dvo_get_current_mode(connector);
 549                         intel_dvo->panel_wants_dither = true;
 550                 }
 551
 552                 drm_sysfs_connector_add(connector);
 553                 return;
 554         }
 555
 556         drm_encoder_cleanup(&intel_encoder->base);
 557         kfree(intel_dvo);
 558         kfree(intel_connector);
 559 }