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 container_of(intel_attached_encoder(connector),
 111                             struct intel_dvo, base);
 112 }
 113
 114 static bool intel_dvo_connector_get_hw_state(struct intel_connector *connector)
 115 {
 116         struct intel_dvo *intel_dvo = intel_attached_dvo(&connector->base);
 117
 118         return intel_dvo->dev.dev_ops->get_hw_state(&intel_dvo->dev);
 119 }
 120
 121 static bool intel_dvo_get_hw_state(struct intel_encoder *encoder,
 122                                    enum pipe *pipe)
 123 {
 124         struct drm_device *dev = encoder->base.dev;
 125         struct drm_i915_private *dev_priv = dev->dev_private;
 126         struct intel_dvo *intel_dvo = enc_to_dvo(encoder);
 127         u32 tmp;
 128
 129         tmp = I915_READ(intel_dvo->dev.dvo_reg);
 130
 131         if (!(tmp & DVO_ENABLE))
 132                 return false;
 133
 134         *pipe = PORT_TO_PIPE(tmp);
 135
 136         return true;
 137 }
 138
 139 static void intel_dvo_get_config(struct intel_encoder *encoder,
 140                                  struct intel_crtc_config *pipe_config)
 141 {
 142         struct drm_i915_private *dev_priv = encoder->base.dev->dev_private;
 143         struct intel_dvo *intel_dvo = enc_to_dvo(encoder);
 144         u32 tmp, flags = 0;
 145
 146         tmp = I915_READ(intel_dvo->dev.dvo_reg);
 147         if (tmp & DVO_HSYNC_ACTIVE_HIGH)
 148                 flags |= DRM_MODE_FLAG_PHSYNC;
 149         else
 150                 flags |= DRM_MODE_FLAG_NHSYNC;
 151         if (tmp & DVO_VSYNC_ACTIVE_HIGH)
 152                 flags |= DRM_MODE_FLAG_PVSYNC;
 153         else
 154                 flags |= DRM_MODE_FLAG_NVSYNC;
 155
 156         pipe_config->adjusted_mode.flags |= flags;
 157 }
 158
 159 static void intel_disable_dvo(struct intel_encoder *encoder)
 160 {
 161         struct drm_i915_private *dev_priv = encoder->base.dev->dev_private;
 162         struct intel_dvo *intel_dvo = enc_to_dvo(encoder);
 163         u32 dvo_reg = intel_dvo->dev.dvo_reg;
 164         u32 temp = I915_READ(dvo_reg);
 165
 166         intel_dvo->dev.dev_ops->dpms(&intel_dvo->dev, false);
 167         I915_WRITE(dvo_reg, temp & ~DVO_ENABLE);
 168         I915_READ(dvo_reg);
 169 }
 170
 171 static void intel_enable_dvo(struct intel_encoder *encoder)
 172 {
 173         struct drm_i915_private *dev_priv = encoder->base.dev->dev_private;
 174         struct intel_dvo *intel_dvo = enc_to_dvo(encoder);
 175         u32 dvo_reg = intel_dvo->dev.dvo_reg;
 176         u32 temp = I915_READ(dvo_reg);
 177
 178         I915_WRITE(dvo_reg, temp | DVO_ENABLE);
 179         I915_READ(dvo_reg);
 180         intel_dvo->dev.dev_ops->dpms(&intel_dvo->dev, true);
 181 }
 182
 183 /* Special dpms function to support cloning between dvo/sdvo/crt. */
 184 static void intel_dvo_dpms(struct drm_connector *connector, int mode)
 185 {
 186         struct intel_dvo *intel_dvo = intel_attached_dvo(connector);
 187         struct drm_crtc *crtc;
 188
 189         /* dvo supports only 2 dpms states. */
 190         if (mode != DRM_MODE_DPMS_ON)
 191                 mode = DRM_MODE_DPMS_OFF;
 192
 193         if (mode == connector->dpms)
 194                 return;
 195
 196         connector->dpms = mode;
 197
 198         /* Only need to change hw state when actually enabled */
 199         crtc = intel_dvo->base.base.crtc;
 200         if (!crtc) {
 201                 intel_dvo->base.connectors_active = false;
 202                 return;
 203         }
 204
 205         /* We call connector dpms manually below in case pipe dpms doesn't
 206          * change due to cloning. */
 207         if (mode == DRM_MODE_DPMS_ON) {
 208                 intel_dvo->base.connectors_active = true;
 209
 210                 intel_crtc_update_dpms(crtc);
 211
 212                 intel_dvo->dev.dev_ops->dpms(&intel_dvo->dev, true);
 213         } else {
 214                 intel_dvo->dev.dev_ops->dpms(&intel_dvo->dev, false);
 215
 216                 intel_dvo->base.connectors_active = false;
 217
 218                 intel_crtc_update_dpms(crtc);
 219         }
 220
 221         intel_modeset_check_state(connector->dev);
 222 }
 223
 224 static int intel_dvo_mode_valid(struct drm_connector *connector,
 225                                 struct drm_display_mode *mode)
 226 {
 227         struct intel_dvo *intel_dvo = intel_attached_dvo(connector);
 228
 229         if (mode->flags & DRM_MODE_FLAG_DBLSCAN)
 230                 return MODE_NO_DBLESCAN;
 231
 232         /* XXX: Validate clock range */
 233
 234         if (intel_dvo->panel_fixed_mode) {
 235                 if (mode->hdisplay > intel_dvo->panel_fixed_mode->hdisplay)
 236                         return MODE_PANEL;
 237                 if (mode->vdisplay > intel_dvo->panel_fixed_mode->vdisplay)
 238                         return MODE_PANEL;
 239         }
 240
 241         return intel_dvo->dev.dev_ops->mode_valid(&intel_dvo->dev, mode);
 242 }
 243
 244 static bool intel_dvo_mode_fixup(struct drm_encoder *encoder,
 245                                  const struct drm_display_mode *mode,
 246                                  struct drm_display_mode *adjusted_mode)
 247 {
 248         struct intel_dvo *intel_dvo = enc_to_dvo(to_intel_encoder(encoder));
 249
 250         /* If we have timings from the BIOS for the panel, put them in
 251          * to the adjusted mode.  The CRTC will be set up for this mode,
 252          * with the panel scaling set up to source from the H/VDisplay
 253          * of the original mode.
 254          */
 255         if (intel_dvo->panel_fixed_mode != NULL) {
 256 #define C(x) adjusted_mode->x = intel_dvo->panel_fixed_mode->x
 257                 C(hdisplay);
 258                 C(hsync_start);
 259                 C(hsync_end);
 260                 C(htotal);
 261                 C(vdisplay);
 262                 C(vsync_start);
 263                 C(vsync_end);
 264                 C(vtotal);
 265                 C(clock);
 266 #undef C
 267         }
 268
 269         if (intel_dvo->dev.dev_ops->mode_fixup)
 270                 return intel_dvo->dev.dev_ops->mode_fixup(&intel_dvo->dev, mode, adjusted_mode);
 271
 272         return true;
 273 }
 274
 275 static void intel_dvo_mode_set(struct drm_encoder *encoder,
 276                                struct drm_display_mode *mode,
 277                                struct drm_display_mode *adjusted_mode)
 278 {
 279         struct drm_device *dev = encoder->dev;
 280         struct drm_i915_private *dev_priv = dev->dev_private;
 281         struct intel_crtc *intel_crtc = to_intel_crtc(encoder->crtc);
 282         struct intel_dvo *intel_dvo = enc_to_dvo(to_intel_encoder(encoder));
 283         int pipe = intel_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, mode, adjusted_mode);
 301
 302         /* Save the data order, since I don't know what it should be set to. */
 303         dvo_val = I915_READ(dvo_reg) &
 304                   (DVO_PRESERVE_MASK | DVO_DATA_ORDER_GBRG);
 305         dvo_val |= DVO_DATA_ORDER_FP | DVO_BORDER_ENABLE |
 306                    DVO_BLANK_ACTIVE_HIGH;
 307
 308         if (pipe == 1)
 309                 dvo_val |= DVO_PIPE_B_SELECT;
 310         dvo_val |= DVO_PIPE_STALL;
 311         if (adjusted_mode->flags & DRM_MODE_FLAG_PHSYNC)
 312                 dvo_val |= DVO_HSYNC_ACTIVE_HIGH;
 313         if (adjusted_mode->flags & DRM_MODE_FLAG_PVSYNC)
 314                 dvo_val |= DVO_VSYNC_ACTIVE_HIGH;
 315
 316         /*I915_WRITE(DVOB_SRCDIM,
 317           (adjusted_mode->hdisplay << DVO_SRCDIM_HORIZONTAL_SHIFT) |
 318           (adjusted_mode->VDisplay << DVO_SRCDIM_VERTICAL_SHIFT));*/
 319         I915_WRITE(dvo_srcdim_reg,
 320                    (adjusted_mode->hdisplay << DVO_SRCDIM_HORIZONTAL_SHIFT) |
 321                    (adjusted_mode->vdisplay << DVO_SRCDIM_VERTICAL_SHIFT));
 322         /*I915_WRITE(DVOB, dvo_val);*/
 323         I915_WRITE(dvo_reg, dvo_val);
 324 }
 325
 326 /**
 327  * Detect the output connection on our DVO device.
 328  *
 329  * Unimplemented.
 330  */
 331 static enum drm_connector_status
 332 intel_dvo_detect(struct drm_connector *connector, bool force)
 333 {
 334         struct intel_dvo *intel_dvo = intel_attached_dvo(connector);
 335         DRM_DEBUG_KMS("[CONNECTOR:%d:%s]\n",
 336                       connector->base.id, drm_get_connector_name(connector));
 337         return intel_dvo->dev.dev_ops->detect(&intel_dvo->dev);
 338 }
 339
 340 static int intel_dvo_get_modes(struct drm_connector *connector)
 341 {
 342         struct intel_dvo *intel_dvo = intel_attached_dvo(connector);
 343         struct drm_i915_private *dev_priv = connector->dev->dev_private;
 344
 345         /* We should probably have an i2c driver get_modes function for those
 346          * devices which will have a fixed set of modes determined by the chip
 347          * (TV-out, for example), but for now with just TMDS and LVDS,
 348          * that's not the case.
 349          */
 350         intel_ddc_get_modes(connector,
 351                             intel_gmbus_get_adapter(dev_priv, GMBUS_PORT_DPC));
 352         if (!list_empty(&connector->probed_modes))
 353                 return 1;
 354
 355         if (intel_dvo->panel_fixed_mode != NULL) {
 356                 struct drm_display_mode *mode;
 357                 mode = drm_mode_duplicate(connector->dev, intel_dvo->panel_fixed_mode);
 358                 if (mode) {
 359                         drm_mode_probed_add(connector, mode);
 360                         return 1;
 361                 }
 362         }
 363
 364         return 0;
 365 }
 366
 367 static void intel_dvo_destroy(struct drm_connector *connector)
 368 {
 369         drm_sysfs_connector_remove(connector);
 370         drm_connector_cleanup(connector);
 371         kfree(connector);
 372 }
 373
 374 static const struct drm_encoder_helper_funcs intel_dvo_helper_funcs = {
 375         .mode_fixup = intel_dvo_mode_fixup,
 376         .mode_set = intel_dvo_mode_set,
 377 };
 378
 379 static const struct drm_connector_funcs intel_dvo_connector_funcs = {
 380         .dpms = intel_dvo_dpms,
 381         .detect = intel_dvo_detect,
 382         .destroy = intel_dvo_destroy,
 383         .fill_modes = drm_helper_probe_single_connector_modes,
 384 };
 385
 386 static const struct drm_connector_helper_funcs intel_dvo_connector_helper_funcs = {
 387         .mode_valid = intel_dvo_mode_valid,
 388         .get_modes = intel_dvo_get_modes,
 389         .best_encoder = intel_best_encoder,
 390 };
 391
 392 static void intel_dvo_enc_destroy(struct drm_encoder *encoder)
 393 {
 394         struct intel_dvo *intel_dvo = enc_to_dvo(to_intel_encoder(encoder));
 395
 396         if (intel_dvo->dev.dev_ops->destroy)
 397                 intel_dvo->dev.dev_ops->destroy(&intel_dvo->dev);
 398
 399         kfree(intel_dvo->panel_fixed_mode);
 400
 401         intel_encoder_destroy(encoder);
 402 }
 403
 404 static const struct drm_encoder_funcs intel_dvo_enc_funcs = {
 405         .destroy = intel_dvo_enc_destroy,
 406 };
 407
 408 /**
 409  * Attempts to get a fixed panel timing for LVDS (currently only the i830).
 410  *
 411  * Other chips with DVO LVDS will need to extend this to deal with the LVDS
 412  * chip being on DVOB/C and having multiple pipes.
 413  */
 414 static struct drm_display_mode *
 415 intel_dvo_get_current_mode(struct drm_connector *connector)
 416 {
 417         struct drm_device *dev = connector->dev;
 418         struct drm_i915_private *dev_priv = dev->dev_private;
 419         struct intel_dvo *intel_dvo = intel_attached_dvo(connector);
 420         uint32_t dvo_val = I915_READ(intel_dvo->dev.dvo_reg);
 421         struct drm_display_mode *mode = NULL;
 422
 423         /* If the DVO port is active, that'll be the LVDS, so we can pull out
 424          * its timings to get how the BIOS set up the panel.
 425          */
 426         if (dvo_val & DVO_ENABLE) {
 427                 struct drm_crtc *crtc;
 428                 int pipe = (dvo_val & DVO_PIPE_B_SELECT) ? 1 : 0;
 429
 430                 crtc = intel_get_crtc_for_pipe(dev, pipe);
 431                 if (crtc) {
 432                         mode = intel_crtc_mode_get(dev, crtc);
 433                         if (mode) {
 434                                 mode->type |= DRM_MODE_TYPE_PREFERRED;
 435                                 if (dvo_val & DVO_HSYNC_ACTIVE_HIGH)
 436                                         mode->flags |= DRM_MODE_FLAG_PHSYNC;
 437                                 if (dvo_val & DVO_VSYNC_ACTIVE_HIGH)
 438                                         mode->flags |= DRM_MODE_FLAG_PVSYNC;
 439                         }
 440                 }
 441         }
 442
 443         return mode;
 444 }
 445
 446 void intel_dvo_init(struct drm_device *dev)
 447 {
 448         struct drm_i915_private *dev_priv = dev->dev_private;
 449         struct intel_encoder *intel_encoder;
 450         struct intel_dvo *intel_dvo;
 451         struct intel_connector *intel_connector;
 452         int i;
 453         int encoder_type = DRM_MODE_ENCODER_NONE;
 454
 455         intel_dvo = kzalloc(sizeof(struct intel_dvo), GFP_KERNEL);
 456         if (!intel_dvo)
 457                 return;
 458
 459         intel_connector = kzalloc(sizeof(struct intel_connector), GFP_KERNEL);
 460         if (!intel_connector) {
 461                 kfree(intel_dvo);
 462                 return;
 463         }
 464
 465         intel_encoder = &intel_dvo->base;
 466         drm_encoder_init(dev, &intel_encoder->base,
 467                          &intel_dvo_enc_funcs, encoder_type);
 468
 469         intel_encoder->disable = intel_disable_dvo;
 470         intel_encoder->enable = intel_enable_dvo;
 471         intel_encoder->get_hw_state = intel_dvo_get_hw_state;
 472         intel_encoder->get_config = intel_dvo_get_config;
 473         intel_connector->get_hw_state = intel_dvo_connector_get_hw_state;
 474
 475         /* Now, try to find a controller */
 476         for (i = 0; i < ARRAY_SIZE(intel_dvo_devices); i++) {
 477                 struct drm_connector *connector = &intel_connector->base;
 478                 const struct intel_dvo_device *dvo = &intel_dvo_devices[i];
 479                 struct i2c_adapter *i2c;
 480                 int gpio;
 481                 bool dvoinit;
 482
 483                 /* Allow the I2C driver info to specify the GPIO to be used in
 484                  * special cases, but otherwise default to what's defined
 485                  * in the spec.
 486                  */
 487                 if (intel_gmbus_is_port_valid(dvo->gpio))
 488                         gpio = dvo->gpio;
 489                 else if (dvo->type == INTEL_DVO_CHIP_LVDS)
 490                         gpio = GMBUS_PORT_SSC;
 491                 else
 492                         gpio = GMBUS_PORT_DPB;
 493
 494                 /* Set up the I2C bus necessary for the chip we're probing.
 495                  * It appears that everything is on GPIOE except for panels
 496                  * on i830 laptops, which are on GPIOB (DVOA).
 497                  */
 498                 i2c = intel_gmbus_get_adapter(dev_priv, gpio);
 499
 500                 intel_dvo->dev = *dvo;
 501
 502                 /* GMBUS NAK handling seems to be unstable, hence let the
 503                  * transmitter detection run in bit banging mode for now.
 504                  */
 505                 intel_gmbus_force_bit(i2c, true);
 506
 507                 dvoinit = dvo->dev_ops->init(&intel_dvo->dev, i2c);
 508
 509                 intel_gmbus_force_bit(i2c, false);
 510
 511                 if (!dvoinit)
 512                         continue;
 513
 514                 intel_encoder->type = INTEL_OUTPUT_DVO;
 515                 intel_encoder->crtc_mask = (1 << 0) | (1 << 1);
 516                 switch (dvo->type) {
 517                 case INTEL_DVO_CHIP_TMDS:
 518                         intel_encoder->cloneable = true;
 519                         drm_connector_init(dev, connector,
 520                                            &intel_dvo_connector_funcs,
 521                                            DRM_MODE_CONNECTOR_DVII);
 522                         encoder_type = DRM_MODE_ENCODER_TMDS;
 523                         break;
 524                 case INTEL_DVO_CHIP_LVDS:
 525                         intel_encoder->cloneable = false;
 526                         drm_connector_init(dev, connector,
 527                                            &intel_dvo_connector_funcs,
 528                                            DRM_MODE_CONNECTOR_LVDS);
 529                         encoder_type = DRM_MODE_ENCODER_LVDS;
 530                         break;
 531                 }
 532
 533                 drm_connector_helper_add(connector,
 534                                          &intel_dvo_connector_helper_funcs);
 535                 connector->display_info.subpixel_order = SubPixelHorizontalRGB;
 536                 connector->interlace_allowed = false;
 537                 connector->doublescan_allowed = false;
 538
 539                 drm_encoder_helper_add(&intel_encoder->base,
 540                                        &intel_dvo_helper_funcs);
 541
 542                 intel_connector_attach_encoder(intel_connector, intel_encoder);
 543                 if (dvo->type == INTEL_DVO_CHIP_LVDS) {
 544                         /* For our LVDS chipsets, we should hopefully be able
 545                          * to dig the fixed panel mode out of the BIOS data.
 546                          * However, it's in a different format from the BIOS
 547                          * data on chipsets with integrated LVDS (stored in AIM
 548                          * headers, likely), so for now, just get the current
 549                          * mode being output through DVO.
 550                          */
 551                         intel_dvo->panel_fixed_mode =
 552                                 intel_dvo_get_current_mode(connector);
 553                         intel_dvo->panel_wants_dither = true;
 554                 }
 555
 556                 drm_sysfs_connector_add(connector);
 557                 return;
 558         }
 559
 560         drm_encoder_cleanup(&intel_encoder->base);
 561         kfree(intel_dvo);
 562         kfree(intel_connector);
 563 }