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_atomic_helper.h>
  31 #include <drm/drm_crtc.h>
  32 #include "intel_drv.h"
  33 #include <drm/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 #define NS2501_ADDR     0x38
  41
  42 static const struct intel_dvo_device intel_dvo_devices[] = {
  43         {
  44                 .type = INTEL_DVO_CHIP_TMDS,
  45                 .name = "sil164",
  46                 .dvo_reg = DVOC,
  47                 .dvo_srcdim_reg = DVOC_SRCDIM,
  48                 .slave_addr = SIL164_ADDR,
  49                 .dev_ops = &sil164_ops,
  50         },
  51         {
  52                 .type = INTEL_DVO_CHIP_TMDS,
  53                 .name = "ch7xxx",
  54                 .dvo_reg = DVOC,
  55                 .dvo_srcdim_reg = DVOC_SRCDIM,
  56                 .slave_addr = CH7xxx_ADDR,
  57                 .dev_ops = &ch7xxx_ops,
  58         },
  59         {
  60                 .type = INTEL_DVO_CHIP_TMDS,
  61                 .name = "ch7xxx",
  62                 .dvo_reg = DVOC,
  63                 .dvo_srcdim_reg = DVOC_SRCDIM,
  64                 .slave_addr = 0x75, /* For some ch7010 */
  65                 .dev_ops = &ch7xxx_ops,
  66         },
  67         {
  68                 .type = INTEL_DVO_CHIP_LVDS,
  69                 .name = "ivch",
  70                 .dvo_reg = DVOA,
  71                 .dvo_srcdim_reg = DVOA_SRCDIM,
  72                 .slave_addr = 0x02, /* Might also be 0x44, 0x84, 0xc4 */
  73                 .dev_ops = &ivch_ops,
  74         },
  75         {
  76                 .type = INTEL_DVO_CHIP_TMDS,
  77                 .name = "tfp410",
  78                 .dvo_reg = DVOC,
  79                 .dvo_srcdim_reg = DVOC_SRCDIM,
  80                 .slave_addr = TFP410_ADDR,
  81                 .dev_ops = &tfp410_ops,
  82         },
  83         {
  84                 .type = INTEL_DVO_CHIP_LVDS,
  85                 .name = "ch7017",
  86                 .dvo_reg = DVOC,
  87                 .dvo_srcdim_reg = DVOC_SRCDIM,
  88                 .slave_addr = 0x75,
  89                 .gpio = GMBUS_PIN_DPB,
  90                 .dev_ops = &ch7017_ops,
  91         },
  92         {
  93                 .type = INTEL_DVO_CHIP_TMDS,
  94                 .name = "ns2501",
  95                 .dvo_reg = DVOB,
  96                 .dvo_srcdim_reg = DVOB_SRCDIM,
  97                 .slave_addr = NS2501_ADDR,
  98                 .dev_ops = &ns2501_ops,
  99        }
 100 };
 101
 102 struct intel_dvo {
 103         struct intel_encoder base;
 104
 105         struct intel_dvo_device dev;
 106
 107         struct intel_connector *attached_connector;
 108
 109         bool panel_wants_dither;
 110 };
 111
 112 static struct intel_dvo *enc_to_dvo(struct intel_encoder *encoder)
 113 {
 114         return container_of(encoder, struct intel_dvo, base);
 115 }
 116
 117 static struct intel_dvo *intel_attached_dvo(struct drm_connector *connector)
 118 {
 119         return enc_to_dvo(intel_attached_encoder(connector));
 120 }
 121
 122 static bool intel_dvo_connector_get_hw_state(struct intel_connector *connector)
 123 {
 124         struct drm_device *dev = connector->base.dev;
 125         struct drm_i915_private *dev_priv = to_i915(dev);
 126         struct intel_dvo *intel_dvo = intel_attached_dvo(&connector->base);
 127         u32 tmp;
 128
 129         tmp = I915_READ(intel_dvo->dev.dvo_reg);
 130
 131         if (!(tmp & DVO_ENABLE))
 132                 return false;
 133
 134         return intel_dvo->dev.dev_ops->get_hw_state(&intel_dvo->dev);
 135 }
 136
 137 static bool intel_dvo_get_hw_state(struct intel_encoder *encoder,
 138                                    enum pipe *pipe)
 139 {
 140         struct drm_device *dev = encoder->base.dev;
 141         struct drm_i915_private *dev_priv = to_i915(dev);
 142         struct intel_dvo *intel_dvo = enc_to_dvo(encoder);
 143         u32 tmp;
 144
 145         tmp = I915_READ(intel_dvo->dev.dvo_reg);
 146
 147         if (!(tmp & DVO_ENABLE))
 148                 return false;
 149
 150         *pipe = PORT_TO_PIPE(tmp);
 151
 152         return true;
 153 }
 154
 155 static void intel_dvo_get_config(struct intel_encoder *encoder,
 156                                  struct intel_crtc_state *pipe_config)
 157 {
 158         struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
 159         struct intel_dvo *intel_dvo = enc_to_dvo(encoder);
 160         u32 tmp, flags = 0;
 161
 162         pipe_config->output_types |= BIT(INTEL_OUTPUT_DVO);
 163
 164         tmp = I915_READ(intel_dvo->dev.dvo_reg);
 165         if (tmp & DVO_HSYNC_ACTIVE_HIGH)
 166                 flags |= DRM_MODE_FLAG_PHSYNC;
 167         else
 168                 flags |= DRM_MODE_FLAG_NHSYNC;
 169         if (tmp & DVO_VSYNC_ACTIVE_HIGH)
 170                 flags |= DRM_MODE_FLAG_PVSYNC;
 171         else
 172                 flags |= DRM_MODE_FLAG_NVSYNC;
 173
 174         pipe_config->base.adjusted_mode.flags |= flags;
 175
 176         pipe_config->base.adjusted_mode.crtc_clock = pipe_config->port_clock;
 177 }
 178
 179 static void intel_disable_dvo(struct intel_encoder *encoder,
 180                               const struct intel_crtc_state *old_crtc_state,
 181                               const struct drm_connector_state *old_conn_state)
 182 {
 183         struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
 184         struct intel_dvo *intel_dvo = enc_to_dvo(encoder);
 185         i915_reg_t dvo_reg = intel_dvo->dev.dvo_reg;
 186         u32 temp = I915_READ(dvo_reg);
 187
 188         intel_dvo->dev.dev_ops->dpms(&intel_dvo->dev, false);
 189         I915_WRITE(dvo_reg, temp & ~DVO_ENABLE);
 190         I915_READ(dvo_reg);
 191 }
 192
 193 static void intel_enable_dvo(struct intel_encoder *encoder,
 194                              const struct intel_crtc_state *pipe_config,
 195                              const struct drm_connector_state *conn_state)
 196 {
 197         struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
 198         struct intel_dvo *intel_dvo = enc_to_dvo(encoder);
 199         i915_reg_t dvo_reg = intel_dvo->dev.dvo_reg;
 200         u32 temp = I915_READ(dvo_reg);
 201
 202         intel_dvo->dev.dev_ops->mode_set(&intel_dvo->dev,
 203                                          &pipe_config->base.mode,
 204                                          &pipe_config->base.adjusted_mode);
 205
 206         I915_WRITE(dvo_reg, temp | DVO_ENABLE);
 207         I915_READ(dvo_reg);
 208
 209         intel_dvo->dev.dev_ops->dpms(&intel_dvo->dev, true);
 210 }
 211
 212 static enum drm_mode_status
 213 intel_dvo_mode_valid(struct drm_connector *connector,
 214                      struct drm_display_mode *mode)
 215 {
 216         struct intel_dvo *intel_dvo = intel_attached_dvo(connector);
 217         const struct drm_display_mode *fixed_mode =
 218                 to_intel_connector(connector)->panel.fixed_mode;
 219         int max_dotclk = to_i915(connector->dev)->max_dotclk_freq;
 220         int target_clock = mode->clock;
 221
 222         if (mode->flags & DRM_MODE_FLAG_DBLSCAN)
 223                 return MODE_NO_DBLESCAN;
 224
 225         /* XXX: Validate clock range */
 226
 227         if (fixed_mode) {
 228                 if (mode->hdisplay > fixed_mode->hdisplay)
 229                         return MODE_PANEL;
 230                 if (mode->vdisplay > fixed_mode->vdisplay)
 231                         return MODE_PANEL;
 232
 233                 target_clock = fixed_mode->clock;
 234         }
 235
 236         if (target_clock > max_dotclk)
 237                 return MODE_CLOCK_HIGH;
 238
 239         return intel_dvo->dev.dev_ops->mode_valid(&intel_dvo->dev, mode);
 240 }
 241
 242 static bool intel_dvo_compute_config(struct intel_encoder *encoder,
 243                                      struct intel_crtc_state *pipe_config,
 244                                      struct drm_connector_state *conn_state)
 245 {
 246         struct intel_dvo *intel_dvo = enc_to_dvo(encoder);
 247         const struct drm_display_mode *fixed_mode =
 248                 intel_dvo->attached_connector->panel.fixed_mode;
 249         struct drm_display_mode *adjusted_mode = &pipe_config->base.adjusted_mode;
 250
 251         /* If we have timings from the BIOS for the panel, put them in
 252          * to the adjusted mode.  The CRTC will be set up for this mode,
 253          * with the panel scaling set up to source from the H/VDisplay
 254          * of the original mode.
 255          */
 256         if (fixed_mode)
 257                 intel_fixed_panel_mode(fixed_mode, adjusted_mode);
 258
 259         return true;
 260 }
 261
 262 static void intel_dvo_pre_enable(struct intel_encoder *encoder,
 263                                  const struct intel_crtc_state *pipe_config,
 264                                  const struct drm_connector_state *conn_state)
 265 {
 266         struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
 267         struct intel_crtc *crtc = to_intel_crtc(pipe_config->base.crtc);
 268         const struct drm_display_mode *adjusted_mode = &pipe_config->base.adjusted_mode;
 269         struct intel_dvo *intel_dvo = enc_to_dvo(encoder);
 270         int pipe = crtc->pipe;
 271         u32 dvo_val;
 272         i915_reg_t dvo_reg = intel_dvo->dev.dvo_reg;
 273         i915_reg_t dvo_srcdim_reg = intel_dvo->dev.dvo_srcdim_reg;
 274
 275         /* Save the data order, since I don't know what it should be set to. */
 276         dvo_val = I915_READ(dvo_reg) &
 277                   (DVO_PRESERVE_MASK | DVO_DATA_ORDER_GBRG);
 278         dvo_val |= DVO_DATA_ORDER_FP | DVO_BORDER_ENABLE |
 279                    DVO_BLANK_ACTIVE_HIGH;
 280
 281         if (pipe == 1)
 282                 dvo_val |= DVO_PIPE_B_SELECT;
 283         dvo_val |= DVO_PIPE_STALL;
 284         if (adjusted_mode->flags & DRM_MODE_FLAG_PHSYNC)
 285                 dvo_val |= DVO_HSYNC_ACTIVE_HIGH;
 286         if (adjusted_mode->flags & DRM_MODE_FLAG_PVSYNC)
 287                 dvo_val |= DVO_VSYNC_ACTIVE_HIGH;
 288
 289         /*I915_WRITE(DVOB_SRCDIM,
 290           (adjusted_mode->crtc_hdisplay << DVO_SRCDIM_HORIZONTAL_SHIFT) |
 291           (adjusted_mode->crtc_vdisplay << DVO_SRCDIM_VERTICAL_SHIFT));*/
 292         I915_WRITE(dvo_srcdim_reg,
 293                    (adjusted_mode->crtc_hdisplay << DVO_SRCDIM_HORIZONTAL_SHIFT) |
 294                    (adjusted_mode->crtc_vdisplay << DVO_SRCDIM_VERTICAL_SHIFT));
 295         /*I915_WRITE(DVOB, dvo_val);*/
 296         I915_WRITE(dvo_reg, dvo_val);
 297 }
 298
 299 /**
 300  * Detect the output connection on our DVO device.
 301  *
 302  * Unimplemented.
 303  */
 304 static enum drm_connector_status
 305 intel_dvo_detect(struct drm_connector *connector, bool force)
 306 {
 307         struct intel_dvo *intel_dvo = intel_attached_dvo(connector);
 308         DRM_DEBUG_KMS("[CONNECTOR:%d:%s]\n",
 309                       connector->base.id, connector->name);
 310         return intel_dvo->dev.dev_ops->detect(&intel_dvo->dev);
 311 }
 312
 313 static int intel_dvo_get_modes(struct drm_connector *connector)
 314 {
 315         struct drm_i915_private *dev_priv = to_i915(connector->dev);
 316         const struct drm_display_mode *fixed_mode =
 317                 to_intel_connector(connector)->panel.fixed_mode;
 318
 319         /* We should probably have an i2c driver get_modes function for those
 320          * devices which will have a fixed set of modes determined by the chip
 321          * (TV-out, for example), but for now with just TMDS and LVDS,
 322          * that's not the case.
 323          */
 324         intel_ddc_get_modes(connector,
 325                             intel_gmbus_get_adapter(dev_priv, GMBUS_PIN_DPC));
 326         if (!list_empty(&connector->probed_modes))
 327                 return 1;
 328
 329         if (fixed_mode) {
 330                 struct drm_display_mode *mode;
 331                 mode = drm_mode_duplicate(connector->dev, fixed_mode);
 332                 if (mode) {
 333                         drm_mode_probed_add(connector, mode);
 334                         return 1;
 335                 }
 336         }
 337
 338         return 0;
 339 }
 340
 341 static void intel_dvo_destroy(struct drm_connector *connector)
 342 {
 343         drm_connector_cleanup(connector);
 344         intel_panel_fini(&to_intel_connector(connector)->panel);
 345         kfree(connector);
 346 }
 347
 348 static const struct drm_connector_funcs intel_dvo_connector_funcs = {
 349         .detect = intel_dvo_detect,
 350         .late_register = intel_connector_register,
 351         .early_unregister = intel_connector_unregister,
 352         .destroy = intel_dvo_destroy,
 353         .fill_modes = drm_helper_probe_single_connector_modes,
 354         .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
 355         .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
 356 };
 357
 358 static const struct drm_connector_helper_funcs intel_dvo_connector_helper_funcs = {
 359         .mode_valid = intel_dvo_mode_valid,
 360         .get_modes = intel_dvo_get_modes,
 361 };
 362
 363 static void intel_dvo_enc_destroy(struct drm_encoder *encoder)
 364 {
 365         struct intel_dvo *intel_dvo = enc_to_dvo(to_intel_encoder(encoder));
 366
 367         if (intel_dvo->dev.dev_ops->destroy)
 368                 intel_dvo->dev.dev_ops->destroy(&intel_dvo->dev);
 369
 370         intel_encoder_destroy(encoder);
 371 }
 372
 373 static const struct drm_encoder_funcs intel_dvo_enc_funcs = {
 374         .destroy = intel_dvo_enc_destroy,
 375 };
 376
 377 /**
 378  * Attempts to get a fixed panel timing for LVDS (currently only the i830).
 379  *
 380  * Other chips with DVO LVDS will need to extend this to deal with the LVDS
 381  * chip being on DVOB/C and having multiple pipes.
 382  */
 383 static struct drm_display_mode *
 384 intel_dvo_get_current_mode(struct intel_encoder *encoder)
 385 {
 386         struct drm_display_mode *mode;
 387
 388         mode = intel_encoder_current_mode(encoder);
 389         if (mode) {
 390                 DRM_DEBUG_KMS("using current (BIOS) mode: ");
 391                 drm_mode_debug_printmodeline(mode);
 392                 mode->type |= DRM_MODE_TYPE_PREFERRED;
 393         }
 394
 395         return mode;
 396 }
 397
 398 static enum port intel_dvo_port(i915_reg_t dvo_reg)
 399 {
 400         if (i915_mmio_reg_equal(dvo_reg, DVOA))
 401                 return PORT_A;
 402         else if (i915_mmio_reg_equal(dvo_reg, DVOB))
 403                 return PORT_B;
 404         else
 405                 return PORT_C;
 406 }
 407
 408 void intel_dvo_init(struct drm_i915_private *dev_priv)
 409 {
 410         struct intel_encoder *intel_encoder;
 411         struct intel_dvo *intel_dvo;
 412         struct intel_connector *intel_connector;
 413         int i;
 414         int encoder_type = DRM_MODE_ENCODER_NONE;
 415
 416         intel_dvo = kzalloc(sizeof(*intel_dvo), GFP_KERNEL);
 417         if (!intel_dvo)
 418                 return;
 419
 420         intel_connector = intel_connector_alloc();
 421         if (!intel_connector) {
 422                 kfree(intel_dvo);
 423                 return;
 424         }
 425
 426         intel_dvo->attached_connector = intel_connector;
 427
 428         intel_encoder = &intel_dvo->base;
 429
 430         intel_encoder->disable = intel_disable_dvo;
 431         intel_encoder->enable = intel_enable_dvo;
 432         intel_encoder->get_hw_state = intel_dvo_get_hw_state;
 433         intel_encoder->get_config = intel_dvo_get_config;
 434         intel_encoder->compute_config = intel_dvo_compute_config;
 435         intel_encoder->pre_enable = intel_dvo_pre_enable;
 436         intel_connector->get_hw_state = intel_dvo_connector_get_hw_state;
 437
 438         /* Now, try to find a controller */
 439         for (i = 0; i < ARRAY_SIZE(intel_dvo_devices); i++) {
 440                 struct drm_connector *connector = &intel_connector->base;
 441                 const struct intel_dvo_device *dvo = &intel_dvo_devices[i];
 442                 struct i2c_adapter *i2c;
 443                 int gpio;
 444                 bool dvoinit;
 445                 enum pipe pipe;
 446                 uint32_t dpll[I915_MAX_PIPES];
 447                 enum port port;
 448
 449                 /* Allow the I2C driver info to specify the GPIO to be used in
 450                  * special cases, but otherwise default to what's defined
 451                  * in the spec.
 452                  */
 453                 if (intel_gmbus_is_valid_pin(dev_priv, dvo->gpio))
 454                         gpio = dvo->gpio;
 455                 else if (dvo->type == INTEL_DVO_CHIP_LVDS)
 456                         gpio = GMBUS_PIN_SSC;
 457                 else
 458                         gpio = GMBUS_PIN_DPB;
 459
 460                 /* Set up the I2C bus necessary for the chip we're probing.
 461                  * It appears that everything is on GPIOE except for panels
 462                  * on i830 laptops, which are on GPIOB (DVOA).
 463                  */
 464                 i2c = intel_gmbus_get_adapter(dev_priv, gpio);
 465
 466                 intel_dvo->dev = *dvo;
 467
 468                 /* GMBUS NAK handling seems to be unstable, hence let the
 469                  * transmitter detection run in bit banging mode for now.
 470                  */
 471                 intel_gmbus_force_bit(i2c, true);
 472
 473                 /* ns2501 requires the DVO 2x clock before it will
 474                  * respond to i2c accesses, so make sure we have
 475                  * have the clock enabled before we attempt to
 476                  * initialize the device.
 477                  */
 478                 for_each_pipe(dev_priv, pipe) {
 479                         dpll[pipe] = I915_READ(DPLL(pipe));
 480                         I915_WRITE(DPLL(pipe), dpll[pipe] | DPLL_DVO_2X_MODE);
 481                 }
 482
 483                 dvoinit = dvo->dev_ops->init(&intel_dvo->dev, i2c);
 484
 485                 /* restore the DVO 2x clock state to original */
 486                 for_each_pipe(dev_priv, pipe) {
 487                         I915_WRITE(DPLL(pipe), dpll[pipe]);
 488                 }
 489
 490                 intel_gmbus_force_bit(i2c, false);
 491
 492                 if (!dvoinit)
 493                         continue;
 494
 495                 port = intel_dvo_port(dvo->dvo_reg);
 496                 drm_encoder_init(&dev_priv->drm, &intel_encoder->base,
 497                                  &intel_dvo_enc_funcs, encoder_type,
 498                                  "DVO %c", port_name(port));
 499
 500                 intel_encoder->type = INTEL_OUTPUT_DVO;
 501                 intel_encoder->power_domain = POWER_DOMAIN_PORT_OTHER;
 502                 intel_encoder->port = port;
 503                 intel_encoder->crtc_mask = (1 << 0) | (1 << 1);
 504
 505                 switch (dvo->type) {
 506                 case INTEL_DVO_CHIP_TMDS:
 507                         intel_encoder->cloneable = (1 << INTEL_OUTPUT_ANALOG) |
 508                                 (1 << INTEL_OUTPUT_DVO);
 509                         drm_connector_init(&dev_priv->drm, connector,
 510                                            &intel_dvo_connector_funcs,
 511                                            DRM_MODE_CONNECTOR_DVII);
 512                         encoder_type = DRM_MODE_ENCODER_TMDS;
 513                         break;
 514                 case INTEL_DVO_CHIP_LVDS:
 515                         intel_encoder->cloneable = 0;
 516                         drm_connector_init(&dev_priv->drm, connector,
 517                                            &intel_dvo_connector_funcs,
 518                                            DRM_MODE_CONNECTOR_LVDS);
 519                         encoder_type = DRM_MODE_ENCODER_LVDS;
 520                         break;
 521                 }
 522
 523                 drm_connector_helper_add(connector,
 524                                          &intel_dvo_connector_helper_funcs);
 525                 connector->display_info.subpixel_order = SubPixelHorizontalRGB;
 526                 connector->interlace_allowed = false;
 527                 connector->doublescan_allowed = false;
 528
 529                 intel_connector_attach_encoder(intel_connector, intel_encoder);
 530                 if (dvo->type == INTEL_DVO_CHIP_LVDS) {
 531                         /* For our LVDS chipsets, we should hopefully be able
 532                          * to dig the fixed panel mode out of the BIOS data.
 533                          * However, it's in a different format from the BIOS
 534                          * data on chipsets with integrated LVDS (stored in AIM
 535                          * headers, likely), so for now, just get the current
 536                          * mode being output through DVO.
 537                          */
 538                         intel_panel_init(&intel_connector->panel,
 539                                          intel_dvo_get_current_mode(intel_encoder),
 540                                          NULL, NULL);
 541                         intel_dvo->panel_wants_dither = true;
 542                 }
 543
 544                 return;
 545         }
 546
 547         kfree(intel_dvo);
 548         kfree(intel_connector);
 549 }