drivers/gpu/drm/i915/display/intel_crt.c

   1 /*
   2  * Copyright © 2006-2007 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  * Authors:
  24  *      Eric Anholt <eric@anholt.net>
  25  */
  26
  27 #include <linux/dmi.h>
  28 #include <linux/i2c.h>
  29 #include <linux/slab.h>
  30
  31 #include <drm/drm_atomic_helper.h>
  32 #include <drm/drm_crtc.h>
  33 #include <drm/drm_edid.h>
  34 #include <drm/drm_probe_helper.h>
  35
  36 #include "i915_drv.h"
  37 #include "i915_irq.h"
  38 #include "i915_reg.h"
  39 #include "intel_connector.h"
  40 #include "intel_crt.h"
  41 #include "intel_crtc.h"
  42 #include "intel_ddi.h"
  43 #include "intel_ddi_buf_trans.h"
  44 #include "intel_de.h"
  45 #include "intel_display_types.h"
  46 #include "intel_fdi.h"
  47 #include "intel_fdi_regs.h"
  48 #include "intel_fifo_underrun.h"
  49 #include "intel_gmbus.h"
  50 #include "intel_hotplug.h"
  51 #include "intel_hotplug_irq.h"
  52 #include "intel_load_detect.h"
  53 #include "intel_pch_display.h"
  54 #include "intel_pch_refclk.h"
  55
  56 /* Here's the desired hotplug mode */
  57 #define ADPA_HOTPLUG_BITS (ADPA_CRT_HOTPLUG_PERIOD_128 |                \
  58                            ADPA_CRT_HOTPLUG_WARMUP_10MS |               \
  59                            ADPA_CRT_HOTPLUG_SAMPLE_4S |                 \
  60                            ADPA_CRT_HOTPLUG_VOLTAGE_50 |                \
  61                            ADPA_CRT_HOTPLUG_VOLREF_325MV |              \
  62                            ADPA_CRT_HOTPLUG_ENABLE)
  63
  64 struct intel_crt {
  65         struct intel_encoder base;
  66         /* DPMS state is stored in the connector, which we need in the
  67          * encoder's enable/disable callbacks */
  68         struct intel_connector *connector;
  69         bool force_hotplug_required;
  70         i915_reg_t adpa_reg;
  71 };
  72
  73 static struct intel_crt *intel_encoder_to_crt(struct intel_encoder *encoder)
  74 {
  75         return container_of(encoder, struct intel_crt, base);
  76 }
  77
  78 static struct intel_crt *intel_attached_crt(struct intel_connector *connector)
  79 {
  80         return intel_encoder_to_crt(intel_attached_encoder(connector));
  81 }
  82
  83 bool intel_crt_port_enabled(struct drm_i915_private *dev_priv,
  84                             i915_reg_t adpa_reg, enum pipe *pipe)
  85 {
  86         u32 val;
  87
  88         val = intel_de_read(dev_priv, adpa_reg);
  89
  90         /* asserts want to know the pipe even if the port is disabled */
  91         if (HAS_PCH_CPT(dev_priv))
  92                 *pipe = (val & ADPA_PIPE_SEL_MASK_CPT) >> ADPA_PIPE_SEL_SHIFT_CPT;
  93         else
  94                 *pipe = (val & ADPA_PIPE_SEL_MASK) >> ADPA_PIPE_SEL_SHIFT;
  95
  96         return val & ADPA_DAC_ENABLE;
  97 }
  98
  99 static bool intel_crt_get_hw_state(struct intel_encoder *encoder,
 100                                    enum pipe *pipe)
 101 {
 102         struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
 103         struct intel_crt *crt = intel_encoder_to_crt(encoder);
 104         intel_wakeref_t wakeref;
 105         bool ret;
 106
 107         wakeref = intel_display_power_get_if_enabled(dev_priv,
 108                                                      encoder->power_domain);
 109         if (!wakeref)
 110                 return false;
 111
 112         ret = intel_crt_port_enabled(dev_priv, crt->adpa_reg, pipe);
 113
 114         intel_display_power_put(dev_priv, encoder->power_domain, wakeref);
 115
 116         return ret;
 117 }
 118
 119 static unsigned int intel_crt_get_flags(struct intel_encoder *encoder)
 120 {
 121         struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
 122         struct intel_crt *crt = intel_encoder_to_crt(encoder);
 123         u32 tmp, flags = 0;
 124
 125         tmp = intel_de_read(dev_priv, crt->adpa_reg);
 126
 127         if (tmp & ADPA_HSYNC_ACTIVE_HIGH)
 128                 flags |= DRM_MODE_FLAG_PHSYNC;
 129         else
 130                 flags |= DRM_MODE_FLAG_NHSYNC;
 131
 132         if (tmp & ADPA_VSYNC_ACTIVE_HIGH)
 133                 flags |= DRM_MODE_FLAG_PVSYNC;
 134         else
 135                 flags |= DRM_MODE_FLAG_NVSYNC;
 136
 137         return flags;
 138 }
 139
 140 static void intel_crt_get_config(struct intel_encoder *encoder,
 141                                  struct intel_crtc_state *pipe_config)
 142 {
 143         pipe_config->output_types |= BIT(INTEL_OUTPUT_ANALOG);
 144
 145         pipe_config->hw.adjusted_mode.flags |= intel_crt_get_flags(encoder);
 146
 147         pipe_config->hw.adjusted_mode.crtc_clock = pipe_config->port_clock;
 148 }
 149
 150 static void hsw_crt_get_config(struct intel_encoder *encoder,
 151                                struct intel_crtc_state *pipe_config)
 152 {
 153         lpt_pch_get_config(pipe_config);
 154
 155         hsw_ddi_get_config(encoder, pipe_config);
 156
 157         pipe_config->hw.adjusted_mode.flags &= ~(DRM_MODE_FLAG_PHSYNC |
 158                                               DRM_MODE_FLAG_NHSYNC |
 159                                               DRM_MODE_FLAG_PVSYNC |
 160                                               DRM_MODE_FLAG_NVSYNC);
 161         pipe_config->hw.adjusted_mode.flags |= intel_crt_get_flags(encoder);
 162 }
 163
 164 /* Note: The caller is required to filter out dpms modes not supported by the
 165  * platform. */
 166 static void intel_crt_set_dpms(struct intel_encoder *encoder,
 167                                const struct intel_crtc_state *crtc_state,
 168                                int mode)
 169 {
 170         struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
 171         struct intel_crt *crt = intel_encoder_to_crt(encoder);
 172         struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
 173         const struct drm_display_mode *adjusted_mode = &crtc_state->hw.adjusted_mode;
 174         u32 adpa;
 175
 176         if (DISPLAY_VER(dev_priv) >= 5)
 177                 adpa = ADPA_HOTPLUG_BITS;
 178         else
 179                 adpa = 0;
 180
 181         if (adjusted_mode->flags & DRM_MODE_FLAG_PHSYNC)
 182                 adpa |= ADPA_HSYNC_ACTIVE_HIGH;
 183         if (adjusted_mode->flags & DRM_MODE_FLAG_PVSYNC)
 184                 adpa |= ADPA_VSYNC_ACTIVE_HIGH;
 185
 186         /* For CPT allow 3 pipe config, for others just use A or B */
 187         if (HAS_PCH_LPT(dev_priv))
 188                 ; /* Those bits don't exist here */
 189         else if (HAS_PCH_CPT(dev_priv))
 190                 adpa |= ADPA_PIPE_SEL_CPT(crtc->pipe);
 191         else
 192                 adpa |= ADPA_PIPE_SEL(crtc->pipe);
 193
 194         if (!HAS_PCH_SPLIT(dev_priv))
 195                 intel_de_write(dev_priv, BCLRPAT(crtc->pipe), 0);
 196
 197         switch (mode) {
 198         case DRM_MODE_DPMS_ON:
 199                 adpa |= ADPA_DAC_ENABLE;
 200                 break;
 201         case DRM_MODE_DPMS_STANDBY:
 202                 adpa |= ADPA_DAC_ENABLE | ADPA_HSYNC_CNTL_DISABLE;
 203                 break;
 204         case DRM_MODE_DPMS_SUSPEND:
 205                 adpa |= ADPA_DAC_ENABLE | ADPA_VSYNC_CNTL_DISABLE;
 206                 break;
 207         case DRM_MODE_DPMS_OFF:
 208                 adpa |= ADPA_HSYNC_CNTL_DISABLE | ADPA_VSYNC_CNTL_DISABLE;
 209                 break;
 210         }
 211
 212         intel_de_write(dev_priv, crt->adpa_reg, adpa);
 213 }
 214
 215 static void intel_disable_crt(struct intel_atomic_state *state,
 216                               struct intel_encoder *encoder,
 217                               const struct intel_crtc_state *old_crtc_state,
 218                               const struct drm_connector_state *old_conn_state)
 219 {
 220         intel_crt_set_dpms(encoder, old_crtc_state, DRM_MODE_DPMS_OFF);
 221 }
 222
 223 static void pch_disable_crt(struct intel_atomic_state *state,
 224                             struct intel_encoder *encoder,
 225                             const struct intel_crtc_state *old_crtc_state,
 226                             const struct drm_connector_state *old_conn_state)
 227 {
 228 }
 229
 230 static void pch_post_disable_crt(struct intel_atomic_state *state,
 231                                  struct intel_encoder *encoder,
 232                                  const struct intel_crtc_state *old_crtc_state,
 233                                  const struct drm_connector_state *old_conn_state)
 234 {
 235         intel_disable_crt(state, encoder, old_crtc_state, old_conn_state);
 236 }
 237
 238 static void hsw_disable_crt(struct intel_atomic_state *state,
 239                             struct intel_encoder *encoder,
 240                             const struct intel_crtc_state *old_crtc_state,
 241                             const struct drm_connector_state *old_conn_state)
 242 {
 243         struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
 244
 245         drm_WARN_ON(&dev_priv->drm, !old_crtc_state->has_pch_encoder);
 246
 247         intel_set_pch_fifo_underrun_reporting(dev_priv, PIPE_A, false);
 248 }
 249
 250 static void hsw_post_disable_crt(struct intel_atomic_state *state,
 251                                  struct intel_encoder *encoder,
 252                                  const struct intel_crtc_state *old_crtc_state,
 253                                  const struct drm_connector_state *old_conn_state)
 254 {
 255         struct intel_crtc *crtc = to_intel_crtc(old_crtc_state->uapi.crtc);
 256         struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
 257
 258         intel_crtc_vblank_off(old_crtc_state);
 259
 260         intel_disable_transcoder(old_crtc_state);
 261
 262         intel_ddi_disable_transcoder_func(old_crtc_state);
 263
 264         ilk_pfit_disable(old_crtc_state);
 265
 266         intel_ddi_disable_transcoder_clock(old_crtc_state);
 267
 268         pch_post_disable_crt(state, encoder, old_crtc_state, old_conn_state);
 269
 270         lpt_pch_disable(state, crtc);
 271
 272         hsw_fdi_disable(encoder);
 273
 274         drm_WARN_ON(&dev_priv->drm, !old_crtc_state->has_pch_encoder);
 275
 276         intel_set_pch_fifo_underrun_reporting(dev_priv, PIPE_A, true);
 277 }
 278
 279 static void hsw_pre_pll_enable_crt(struct intel_atomic_state *state,
 280                                    struct intel_encoder *encoder,
 281                                    const struct intel_crtc_state *crtc_state,
 282                                    const struct drm_connector_state *conn_state)
 283 {
 284         struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
 285
 286         drm_WARN_ON(&dev_priv->drm, !crtc_state->has_pch_encoder);
 287
 288         intel_set_pch_fifo_underrun_reporting(dev_priv, PIPE_A, false);
 289 }
 290
 291 static void hsw_pre_enable_crt(struct intel_atomic_state *state,
 292                                struct intel_encoder *encoder,
 293                                const struct intel_crtc_state *crtc_state,
 294                                const struct drm_connector_state *conn_state)
 295 {
 296         struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
 297         struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
 298         enum pipe pipe = crtc->pipe;
 299
 300         drm_WARN_ON(&dev_priv->drm, !crtc_state->has_pch_encoder);
 301
 302         intel_set_cpu_fifo_underrun_reporting(dev_priv, pipe, false);
 303
 304         hsw_fdi_link_train(encoder, crtc_state);
 305
 306         intel_ddi_enable_transcoder_clock(encoder, crtc_state);
 307 }
 308
 309 static void hsw_enable_crt(struct intel_atomic_state *state,
 310                            struct intel_encoder *encoder,
 311                            const struct intel_crtc_state *crtc_state,
 312                            const struct drm_connector_state *conn_state)
 313 {
 314         struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
 315         struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc);
 316         enum pipe pipe = crtc->pipe;
 317
 318         drm_WARN_ON(&dev_priv->drm, !crtc_state->has_pch_encoder);
 319
 320         intel_ddi_enable_transcoder_func(encoder, crtc_state);
 321
 322         intel_enable_transcoder(crtc_state);
 323
 324         lpt_pch_enable(state, crtc);
 325
 326         intel_crtc_vblank_on(crtc_state);
 327
 328         intel_crt_set_dpms(encoder, crtc_state, DRM_MODE_DPMS_ON);
 329
 330         intel_crtc_wait_for_next_vblank(crtc);
 331         intel_crtc_wait_for_next_vblank(crtc);
 332         intel_set_cpu_fifo_underrun_reporting(dev_priv, pipe, true);
 333         intel_set_pch_fifo_underrun_reporting(dev_priv, PIPE_A, true);
 334 }
 335
 336 static void intel_enable_crt(struct intel_atomic_state *state,
 337                              struct intel_encoder *encoder,
 338                              const struct intel_crtc_state *crtc_state,
 339                              const struct drm_connector_state *conn_state)
 340 {
 341         intel_crt_set_dpms(encoder, crtc_state, DRM_MODE_DPMS_ON);
 342 }
 343
 344 static enum drm_mode_status
 345 intel_crt_mode_valid(struct drm_connector *connector,
 346                      struct drm_display_mode *mode)
 347 {
 348         struct drm_device *dev = connector->dev;
 349         struct drm_i915_private *dev_priv = to_i915(dev);
 350         int max_dotclk = dev_priv->max_dotclk_freq;
 351         int max_clock;
 352
 353         if (mode->flags & DRM_MODE_FLAG_DBLSCAN)
 354                 return MODE_NO_DBLESCAN;
 355
 356         if (mode->clock < 25000)
 357                 return MODE_CLOCK_LOW;
 358
 359         if (HAS_PCH_LPT(dev_priv))
 360                 max_clock = 180000;
 361         else if (IS_VALLEYVIEW(dev_priv))
 362                 /*
 363                  * 270 MHz due to current DPLL limits,
 364                  * DAC limit supposedly 355 MHz.
 365                  */
 366                 max_clock = 270000;
 367         else if (IS_DISPLAY_VER(dev_priv, 3, 4))
 368                 max_clock = 400000;
 369         else
 370                 max_clock = 350000;
 371         if (mode->clock > max_clock)
 372                 return MODE_CLOCK_HIGH;
 373
 374         if (mode->clock > max_dotclk)
 375                 return MODE_CLOCK_HIGH;
 376
 377         /* The FDI receiver on LPT only supports 8bpc and only has 2 lanes. */
 378         if (HAS_PCH_LPT(dev_priv) &&
 379             ilk_get_lanes_required(mode->clock, 270000, 24) > 2)
 380                 return MODE_CLOCK_HIGH;
 381
 382         /* HSW/BDW FDI limited to 4k */
 383         if (mode->hdisplay > 4096)
 384                 return MODE_H_ILLEGAL;
 385
 386         return MODE_OK;
 387 }
 388
 389 static int intel_crt_compute_config(struct intel_encoder *encoder,
 390                                     struct intel_crtc_state *pipe_config,
 391                                     struct drm_connector_state *conn_state)
 392 {
 393         struct drm_display_mode *adjusted_mode =
 394                 &pipe_config->hw.adjusted_mode;
 395
 396         if (adjusted_mode->flags & DRM_MODE_FLAG_DBLSCAN)
 397                 return -EINVAL;
 398
 399         pipe_config->sink_format = INTEL_OUTPUT_FORMAT_RGB;
 400         pipe_config->output_format = INTEL_OUTPUT_FORMAT_RGB;
 401
 402         return 0;
 403 }
 404
 405 static int pch_crt_compute_config(struct intel_encoder *encoder,
 406                                   struct intel_crtc_state *pipe_config,
 407                                   struct drm_connector_state *conn_state)
 408 {
 409         struct drm_display_mode *adjusted_mode =
 410                 &pipe_config->hw.adjusted_mode;
 411
 412         if (adjusted_mode->flags & DRM_MODE_FLAG_DBLSCAN)
 413                 return -EINVAL;
 414
 415         pipe_config->has_pch_encoder = true;
 416         pipe_config->output_format = INTEL_OUTPUT_FORMAT_RGB;
 417
 418         return 0;
 419 }
 420
 421 static int hsw_crt_compute_config(struct intel_encoder *encoder,
 422                                   struct intel_crtc_state *pipe_config,
 423                                   struct drm_connector_state *conn_state)
 424 {
 425         struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
 426         struct drm_display_mode *adjusted_mode =
 427                 &pipe_config->hw.adjusted_mode;
 428
 429         if (adjusted_mode->flags & DRM_MODE_FLAG_DBLSCAN)
 430                 return -EINVAL;
 431
 432         /* HSW/BDW FDI limited to 4k */
 433         if (adjusted_mode->crtc_hdisplay > 4096 ||
 434             adjusted_mode->crtc_hblank_start > 4096)
 435                 return -EINVAL;
 436
 437         pipe_config->has_pch_encoder = true;
 438         pipe_config->output_format = INTEL_OUTPUT_FORMAT_RGB;
 439
 440         /* LPT FDI RX only supports 8bpc. */
 441         if (HAS_PCH_LPT(dev_priv)) {
 442                 if (pipe_config->bw_constrained && pipe_config->pipe_bpp < 24) {
 443                         drm_dbg_kms(&dev_priv->drm,
 444                                     "LPT only supports 24bpp\n");
 445                         return -EINVAL;
 446                 }
 447
 448                 pipe_config->pipe_bpp = 24;
 449         }
 450
 451         /* FDI must always be 2.7 GHz */
 452         pipe_config->port_clock = 135000 * 2;
 453
 454         adjusted_mode->crtc_clock = lpt_iclkip(pipe_config);
 455
 456         return 0;
 457 }
 458
 459 static bool ilk_crt_detect_hotplug(struct drm_connector *connector)
 460 {
 461         struct drm_device *dev = connector->dev;
 462         struct intel_crt *crt = intel_attached_crt(to_intel_connector(connector));
 463         struct drm_i915_private *dev_priv = to_i915(dev);
 464         u32 adpa;
 465         bool ret;
 466
 467         /* The first time through, trigger an explicit detection cycle */
 468         if (crt->force_hotplug_required) {
 469                 bool turn_off_dac = HAS_PCH_SPLIT(dev_priv);
 470                 u32 save_adpa;
 471
 472                 crt->force_hotplug_required = false;
 473
 474                 save_adpa = adpa = intel_de_read(dev_priv, crt->adpa_reg);
 475                 drm_dbg_kms(&dev_priv->drm,
 476                             "trigger hotplug detect cycle: adpa=0x%x\n", adpa);
 477
 478                 adpa |= ADPA_CRT_HOTPLUG_FORCE_TRIGGER;
 479                 if (turn_off_dac)
 480                         adpa &= ~ADPA_DAC_ENABLE;
 481
 482                 intel_de_write(dev_priv, crt->adpa_reg, adpa);
 483
 484                 if (intel_de_wait_for_clear(dev_priv,
 485                                             crt->adpa_reg,
 486                                             ADPA_CRT_HOTPLUG_FORCE_TRIGGER,
 487                                             1000))
 488                         drm_dbg_kms(&dev_priv->drm,
 489                                     "timed out waiting for FORCE_TRIGGER");
 490
 491                 if (turn_off_dac) {
 492                         intel_de_write(dev_priv, crt->adpa_reg, save_adpa);
 493                         intel_de_posting_read(dev_priv, crt->adpa_reg);
 494                 }
 495         }
 496
 497         /* Check the status to see if both blue and green are on now */
 498         adpa = intel_de_read(dev_priv, crt->adpa_reg);
 499         if ((adpa & ADPA_CRT_HOTPLUG_MONITOR_MASK) != 0)
 500                 ret = true;
 501         else
 502                 ret = false;
 503         drm_dbg_kms(&dev_priv->drm, "ironlake hotplug adpa=0x%x, result %d\n",
 504                     adpa, ret);
 505
 506         return ret;
 507 }
 508
 509 static bool valleyview_crt_detect_hotplug(struct drm_connector *connector)
 510 {
 511         struct drm_device *dev = connector->dev;
 512         struct intel_crt *crt = intel_attached_crt(to_intel_connector(connector));
 513         struct drm_i915_private *dev_priv = to_i915(dev);
 514         bool reenable_hpd;
 515         u32 adpa;
 516         bool ret;
 517         u32 save_adpa;
 518
 519         /*
 520          * Doing a force trigger causes a hpd interrupt to get sent, which can
 521          * get us stuck in a loop if we're polling:
 522          *  - We enable power wells and reset the ADPA
 523          *  - output_poll_exec does force probe on VGA, triggering a hpd
 524          *  - HPD handler waits for poll to unlock dev->mode_config.mutex
 525          *  - output_poll_exec shuts off the ADPA, unlocks
 526          *    dev->mode_config.mutex
 527          *  - HPD handler runs, resets ADPA and brings us back to the start
 528          *
 529          * Just disable HPD interrupts here to prevent this
 530          */
 531         reenable_hpd = intel_hpd_disable(dev_priv, crt->base.hpd_pin);
 532
 533         save_adpa = adpa = intel_de_read(dev_priv, crt->adpa_reg);
 534         drm_dbg_kms(&dev_priv->drm,
 535                     "trigger hotplug detect cycle: adpa=0x%x\n", adpa);
 536
 537         adpa |= ADPA_CRT_HOTPLUG_FORCE_TRIGGER;
 538
 539         intel_de_write(dev_priv, crt->adpa_reg, adpa);
 540
 541         if (intel_de_wait_for_clear(dev_priv, crt->adpa_reg,
 542                                     ADPA_CRT_HOTPLUG_FORCE_TRIGGER, 1000)) {
 543                 drm_dbg_kms(&dev_priv->drm,
 544                             "timed out waiting for FORCE_TRIGGER");
 545                 intel_de_write(dev_priv, crt->adpa_reg, save_adpa);
 546         }
 547
 548         /* Check the status to see if both blue and green are on now */
 549         adpa = intel_de_read(dev_priv, crt->adpa_reg);
 550         if ((adpa & ADPA_CRT_HOTPLUG_MONITOR_MASK) != 0)
 551                 ret = true;
 552         else
 553                 ret = false;
 554
 555         drm_dbg_kms(&dev_priv->drm,
 556                     "valleyview hotplug adpa=0x%x, result %d\n", adpa, ret);
 557
 558         if (reenable_hpd)
 559                 intel_hpd_enable(dev_priv, crt->base.hpd_pin);
 560
 561         return ret;
 562 }
 563
 564 static bool intel_crt_detect_hotplug(struct drm_connector *connector)
 565 {
 566         struct drm_device *dev = connector->dev;
 567         struct drm_i915_private *dev_priv = to_i915(dev);
 568         u32 stat;
 569         bool ret = false;
 570         int i, tries = 0;
 571
 572         if (HAS_PCH_SPLIT(dev_priv))
 573                 return ilk_crt_detect_hotplug(connector);
 574
 575         if (IS_VALLEYVIEW(dev_priv))
 576                 return valleyview_crt_detect_hotplug(connector);
 577
 578         /*
 579          * On 4 series desktop, CRT detect sequence need to be done twice
 580          * to get a reliable result.
 581          */
 582
 583         if (IS_G45(dev_priv))
 584                 tries = 2;
 585         else
 586                 tries = 1;
 587
 588         for (i = 0; i < tries ; i++) {
 589                 /* turn on the FORCE_DETECT */
 590                 i915_hotplug_interrupt_update(dev_priv,
 591                                               CRT_HOTPLUG_FORCE_DETECT,
 592                                               CRT_HOTPLUG_FORCE_DETECT);
 593                 /* wait for FORCE_DETECT to go off */
 594                 if (intel_de_wait_for_clear(dev_priv, PORT_HOTPLUG_EN,
 595                                             CRT_HOTPLUG_FORCE_DETECT, 1000))
 596                         drm_dbg_kms(&dev_priv->drm,
 597                                     "timed out waiting for FORCE_DETECT to go off");
 598         }
 599
 600         stat = intel_de_read(dev_priv, PORT_HOTPLUG_STAT);
 601         if ((stat & CRT_HOTPLUG_MONITOR_MASK) != CRT_HOTPLUG_MONITOR_NONE)
 602                 ret = true;
 603
 604         /* clear the interrupt we just generated, if any */
 605         intel_de_write(dev_priv, PORT_HOTPLUG_STAT, CRT_HOTPLUG_INT_STATUS);
 606
 607         i915_hotplug_interrupt_update(dev_priv, CRT_HOTPLUG_FORCE_DETECT, 0);
 608
 609         return ret;
 610 }
 611
 612 static const struct drm_edid *intel_crt_get_edid(struct drm_connector *connector,
 613                                                  struct i2c_adapter *i2c)
 614 {
 615         const struct drm_edid *drm_edid;
 616
 617         drm_edid = drm_edid_read_ddc(connector, i2c);
 618
 619         if (!drm_edid && !intel_gmbus_is_forced_bit(i2c)) {
 620                 drm_dbg_kms(connector->dev,
 621                             "CRT GMBUS EDID read failed, retry using GPIO bit-banging\n");
 622                 intel_gmbus_force_bit(i2c, true);
 623                 drm_edid = drm_edid_read_ddc(connector, i2c);
 624                 intel_gmbus_force_bit(i2c, false);
 625         }
 626
 627         return drm_edid;
 628 }
 629
 630 /* local version of intel_ddc_get_modes() to use intel_crt_get_edid() */
 631 static int intel_crt_ddc_get_modes(struct drm_connector *connector,
 632                                 struct i2c_adapter *adapter)
 633 {
 634         const struct drm_edid *drm_edid;
 635         int ret;
 636
 637         drm_edid = intel_crt_get_edid(connector, adapter);
 638         if (!drm_edid)
 639                 return 0;
 640
 641         ret = intel_connector_update_modes(connector, drm_edid);
 642
 643         drm_edid_free(drm_edid);
 644
 645         return ret;
 646 }
 647
 648 static bool intel_crt_detect_ddc(struct drm_connector *connector)
 649 {
 650         struct intel_crt *crt = intel_attached_crt(to_intel_connector(connector));
 651         struct drm_i915_private *dev_priv = to_i915(crt->base.base.dev);
 652         const struct drm_edid *drm_edid;
 653         struct i2c_adapter *i2c;
 654         bool ret = false;
 655
 656         i2c = intel_gmbus_get_adapter(dev_priv, dev_priv->display.vbt.crt_ddc_pin);
 657         drm_edid = intel_crt_get_edid(connector, i2c);
 658
 659         if (drm_edid) {
 660                 const struct edid *edid = drm_edid_raw(drm_edid);
 661                 bool is_digital = edid->input & DRM_EDID_INPUT_DIGITAL;
 662
 663                 /*
 664                  * This may be a DVI-I connector with a shared DDC
 665                  * link between analog and digital outputs, so we
 666                  * have to check the EDID input spec of the attached device.
 667                  */
 668                 if (!is_digital) {
 669                         drm_dbg_kms(&dev_priv->drm,
 670                                     "CRT detected via DDC:0x50 [EDID]\n");
 671                         ret = true;
 672                 } else {
 673                         drm_dbg_kms(&dev_priv->drm,
 674                                     "CRT not detected via DDC:0x50 [EDID reports a digital panel]\n");
 675                 }
 676         } else {
 677                 drm_dbg_kms(&dev_priv->drm,
 678                             "CRT not detected via DDC:0x50 [no valid EDID found]\n");
 679         }
 680
 681         drm_edid_free(drm_edid);
 682
 683         return ret;
 684 }
 685
 686 static enum drm_connector_status
 687 intel_crt_load_detect(struct intel_crt *crt, enum pipe pipe)
 688 {
 689         struct drm_device *dev = crt->base.base.dev;
 690         struct drm_i915_private *dev_priv = to_i915(dev);
 691         enum transcoder cpu_transcoder = (enum transcoder)pipe;
 692         u32 save_bclrpat;
 693         u32 save_vtotal;
 694         u32 vtotal, vactive;
 695         u32 vsample;
 696         u32 vblank, vblank_start, vblank_end;
 697         u32 dsl;
 698         u8 st00;
 699         enum drm_connector_status status;
 700
 701         drm_dbg_kms(&dev_priv->drm, "starting load-detect on CRT\n");
 702
 703         save_bclrpat = intel_de_read(dev_priv, BCLRPAT(cpu_transcoder));
 704         save_vtotal = intel_de_read(dev_priv, TRANS_VTOTAL(cpu_transcoder));
 705         vblank = intel_de_read(dev_priv, TRANS_VBLANK(cpu_transcoder));
 706
 707         vtotal = REG_FIELD_GET(VTOTAL_MASK, save_vtotal) + 1;
 708         vactive = REG_FIELD_GET(VACTIVE_MASK, save_vtotal) + 1;
 709
 710         vblank_start = REG_FIELD_GET(VBLANK_START_MASK, vblank) + 1;
 711         vblank_end = REG_FIELD_GET(VBLANK_END_MASK, vblank) + 1;
 712
 713         /* Set the border color to purple. */
 714         intel_de_write(dev_priv, BCLRPAT(cpu_transcoder), 0x500050);
 715
 716         if (DISPLAY_VER(dev_priv) != 2) {
 717                 u32 transconf = intel_de_read(dev_priv, TRANSCONF(cpu_transcoder));
 718
 719                 intel_de_write(dev_priv, TRANSCONF(cpu_transcoder),
 720                                transconf | TRANSCONF_FORCE_BORDER);
 721                 intel_de_posting_read(dev_priv, TRANSCONF(cpu_transcoder));
 722                 /* Wait for next Vblank to substitue
 723                  * border color for Color info */
 724                 intel_crtc_wait_for_next_vblank(intel_crtc_for_pipe(dev_priv, pipe));
 725                 st00 = intel_de_read8(dev_priv, _VGA_MSR_WRITE);
 726                 status = ((st00 & (1 << 4)) != 0) ?
 727                         connector_status_connected :
 728                         connector_status_disconnected;
 729
 730                 intel_de_write(dev_priv, TRANSCONF(cpu_transcoder), transconf);
 731         } else {
 732                 bool restore_vblank = false;
 733                 int count, detect;
 734
 735                 /*
 736                 * If there isn't any border, add some.
 737                 * Yes, this will flicker
 738                 */
 739                 if (vblank_start <= vactive && vblank_end >= vtotal) {
 740                         u32 vsync = intel_de_read(dev_priv, TRANS_VSYNC(cpu_transcoder));
 741                         u32 vsync_start = REG_FIELD_GET(VSYNC_START_MASK, vsync) + 1;
 742
 743                         vblank_start = vsync_start;
 744                         intel_de_write(dev_priv, TRANS_VBLANK(cpu_transcoder),
 745                                        VBLANK_START(vblank_start - 1) |
 746                                        VBLANK_END(vblank_end - 1));
 747                         restore_vblank = true;
 748                 }
 749                 /* sample in the vertical border, selecting the larger one */
 750                 if (vblank_start - vactive >= vtotal - vblank_end)
 751                         vsample = (vblank_start + vactive) >> 1;
 752                 else
 753                         vsample = (vtotal + vblank_end) >> 1;
 754
 755                 /*
 756                  * Wait for the border to be displayed
 757                  */
 758                 while (intel_de_read(dev_priv, PIPEDSL(pipe)) >= vactive)
 759                         ;
 760                 while ((dsl = intel_de_read(dev_priv, PIPEDSL(pipe))) <= vsample)
 761                         ;
 762                 /*
 763                  * Watch ST00 for an entire scanline
 764                  */
 765                 detect = 0;
 766                 count = 0;
 767                 do {
 768                         count++;
 769                         /* Read the ST00 VGA status register */
 770                         st00 = intel_de_read8(dev_priv, _VGA_MSR_WRITE);
 771                         if (st00 & (1 << 4))
 772                                 detect++;
 773                 } while ((intel_de_read(dev_priv, PIPEDSL(pipe)) == dsl));
 774
 775                 /* restore vblank if necessary */
 776                 if (restore_vblank)
 777                         intel_de_write(dev_priv, TRANS_VBLANK(cpu_transcoder), vblank);
 778                 /*
 779                  * If more than 3/4 of the scanline detected a monitor,
 780                  * then it is assumed to be present. This works even on i830,
 781                  * where there isn't any way to force the border color across
 782                  * the screen
 783                  */
 784                 status = detect * 4 > count * 3 ?
 785                          connector_status_connected :
 786                          connector_status_disconnected;
 787         }
 788
 789         /* Restore previous settings */
 790         intel_de_write(dev_priv, BCLRPAT(cpu_transcoder), save_bclrpat);
 791
 792         return status;
 793 }
 794
 795 static int intel_spurious_crt_detect_dmi_callback(const struct dmi_system_id *id)
 796 {
 797         DRM_DEBUG_DRIVER("Skipping CRT detection for %s\n", id->ident);
 798         return 1;
 799 }
 800
 801 static const struct dmi_system_id intel_spurious_crt_detect[] = {
 802         {
 803                 .callback = intel_spurious_crt_detect_dmi_callback,
 804                 .ident = "ACER ZGB",
 805                 .matches = {
 806                         DMI_MATCH(DMI_SYS_VENDOR, "ACER"),
 807                         DMI_MATCH(DMI_PRODUCT_NAME, "ZGB"),
 808                 },
 809         },
 810         {
 811                 .callback = intel_spurious_crt_detect_dmi_callback,
 812                 .ident = "Intel DZ77BH-55K",
 813                 .matches = {
 814                         DMI_MATCH(DMI_BOARD_VENDOR, "Intel Corporation"),
 815                         DMI_MATCH(DMI_BOARD_NAME, "DZ77BH-55K"),
 816                 },
 817         },
 818         { }
 819 };
 820
 821 static int
 822 intel_crt_detect(struct drm_connector *connector,
 823                  struct drm_modeset_acquire_ctx *ctx,
 824                  bool force)
 825 {
 826         struct drm_i915_private *dev_priv = to_i915(connector->dev);
 827         struct intel_crt *crt = intel_attached_crt(to_intel_connector(connector));
 828         struct intel_encoder *intel_encoder = &crt->base;
 829         struct drm_atomic_state *state;
 830         intel_wakeref_t wakeref;
 831         int status;
 832
 833         drm_dbg_kms(&dev_priv->drm, "[CONNECTOR:%d:%s] force=%d\n",
 834                     connector->base.id, connector->name,
 835                     force);
 836
 837         if (!INTEL_DISPLAY_ENABLED(dev_priv))
 838                 return connector_status_disconnected;
 839
 840         if (dev_priv->params.load_detect_test) {
 841                 wakeref = intel_display_power_get(dev_priv,
 842                                                   intel_encoder->power_domain);
 843                 goto load_detect;
 844         }
 845
 846         /* Skip machines without VGA that falsely report hotplug events */
 847         if (dmi_check_system(intel_spurious_crt_detect))
 848                 return connector_status_disconnected;
 849
 850         wakeref = intel_display_power_get(dev_priv,
 851                                           intel_encoder->power_domain);
 852
 853         if (I915_HAS_HOTPLUG(dev_priv)) {
 854                 /* We can not rely on the HPD pin always being correctly wired
 855                  * up, for example many KVM do not pass it through, and so
 856                  * only trust an assertion that the monitor is connected.
 857                  */
 858                 if (intel_crt_detect_hotplug(connector)) {
 859                         drm_dbg_kms(&dev_priv->drm,
 860                                     "CRT detected via hotplug\n");
 861                         status = connector_status_connected;
 862                         goto out;
 863                 } else
 864                         drm_dbg_kms(&dev_priv->drm,
 865                                     "CRT not detected via hotplug\n");
 866         }
 867
 868         if (intel_crt_detect_ddc(connector)) {
 869                 status = connector_status_connected;
 870                 goto out;
 871         }
 872
 873         /* Load detection is broken on HPD capable machines. Whoever wants a
 874          * broken monitor (without edid) to work behind a broken kvm (that fails
 875          * to have the right resistors for HP detection) needs to fix this up.
 876          * For now just bail out. */
 877         if (I915_HAS_HOTPLUG(dev_priv)) {
 878                 status = connector_status_disconnected;
 879                 goto out;
 880         }
 881
 882 load_detect:
 883         if (!force) {
 884                 status = connector->status;
 885                 goto out;
 886         }
 887
 888         /* for pre-945g platforms use load detect */
 889         state = intel_load_detect_get_pipe(connector, ctx);
 890         if (IS_ERR(state)) {
 891                 status = PTR_ERR(state);
 892         } else if (!state) {
 893                 status = connector_status_unknown;
 894         } else {
 895                 if (intel_crt_detect_ddc(connector))
 896                         status = connector_status_connected;
 897                 else if (DISPLAY_VER(dev_priv) < 4)
 898                         status = intel_crt_load_detect(crt,
 899                                 to_intel_crtc(connector->state->crtc)->pipe);
 900                 else if (dev_priv->params.load_detect_test)
 901                         status = connector_status_disconnected;
 902                 else
 903                         status = connector_status_unknown;
 904                 intel_load_detect_release_pipe(connector, state, ctx);
 905         }
 906
 907 out:
 908         intel_display_power_put(dev_priv, intel_encoder->power_domain, wakeref);
 909
 910         /*
 911          * Make sure the refs for power wells enabled during detect are
 912          * dropped to avoid a new detect cycle triggered by HPD polling.
 913          */
 914         intel_display_power_flush_work(dev_priv);
 915
 916         return status;
 917 }
 918
 919 static int intel_crt_get_modes(struct drm_connector *connector)
 920 {
 921         struct drm_device *dev = connector->dev;
 922         struct drm_i915_private *dev_priv = to_i915(dev);
 923         struct intel_crt *crt = intel_attached_crt(to_intel_connector(connector));
 924         struct intel_encoder *intel_encoder = &crt->base;
 925         intel_wakeref_t wakeref;
 926         struct i2c_adapter *i2c;
 927         int ret;
 928
 929         wakeref = intel_display_power_get(dev_priv,
 930                                           intel_encoder->power_domain);
 931
 932         i2c = intel_gmbus_get_adapter(dev_priv, dev_priv->display.vbt.crt_ddc_pin);
 933         ret = intel_crt_ddc_get_modes(connector, i2c);
 934         if (ret || !IS_G4X(dev_priv))
 935                 goto out;
 936
 937         /* Try to probe digital port for output in DVI-I -> VGA mode. */
 938         i2c = intel_gmbus_get_adapter(dev_priv, GMBUS_PIN_DPB);
 939         ret = intel_crt_ddc_get_modes(connector, i2c);
 940
 941 out:
 942         intel_display_power_put(dev_priv, intel_encoder->power_domain, wakeref);
 943
 944         return ret;
 945 }
 946
 947 void intel_crt_reset(struct drm_encoder *encoder)
 948 {
 949         struct drm_i915_private *dev_priv = to_i915(encoder->dev);
 950         struct intel_crt *crt = intel_encoder_to_crt(to_intel_encoder(encoder));
 951
 952         if (DISPLAY_VER(dev_priv) >= 5) {
 953                 u32 adpa;
 954
 955                 adpa = intel_de_read(dev_priv, crt->adpa_reg);
 956                 adpa &= ~ADPA_CRT_HOTPLUG_MASK;
 957                 adpa |= ADPA_HOTPLUG_BITS;
 958                 intel_de_write(dev_priv, crt->adpa_reg, adpa);
 959                 intel_de_posting_read(dev_priv, crt->adpa_reg);
 960
 961                 drm_dbg_kms(&dev_priv->drm, "crt adpa set to 0x%x\n", adpa);
 962                 crt->force_hotplug_required = true;
 963         }
 964
 965 }
 966
 967 /*
 968  * Routines for controlling stuff on the analog port
 969  */
 970
 971 static const struct drm_connector_funcs intel_crt_connector_funcs = {
 972         .fill_modes = drm_helper_probe_single_connector_modes,
 973         .late_register = intel_connector_register,
 974         .early_unregister = intel_connector_unregister,
 975         .destroy = intel_connector_destroy,
 976         .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
 977         .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
 978 };
 979
 980 static const struct drm_connector_helper_funcs intel_crt_connector_helper_funcs = {
 981         .detect_ctx = intel_crt_detect,
 982         .mode_valid = intel_crt_mode_valid,
 983         .get_modes = intel_crt_get_modes,
 984 };
 985
 986 static const struct drm_encoder_funcs intel_crt_enc_funcs = {
 987         .reset = intel_crt_reset,
 988         .destroy = intel_encoder_destroy,
 989 };
 990
 991 void intel_crt_init(struct drm_i915_private *dev_priv)
 992 {
 993         struct drm_connector *connector;
 994         struct intel_crt *crt;
 995         struct intel_connector *intel_connector;
 996         i915_reg_t adpa_reg;
 997         u32 adpa;
 998
 999         if (HAS_PCH_SPLIT(dev_priv))
1000                 adpa_reg = PCH_ADPA;
1001         else if (IS_VALLEYVIEW(dev_priv))
1002                 adpa_reg = VLV_ADPA;
1003         else
1004                 adpa_reg = ADPA;
1005
1006         adpa = intel_de_read(dev_priv, adpa_reg);
1007         if ((adpa & ADPA_DAC_ENABLE) == 0) {
1008                 /*
1009                  * On some machines (some IVB at least) CRT can be
1010                  * fused off, but there's no known fuse bit to
1011                  * indicate that. On these machine the ADPA register
1012                  * works normally, except the DAC enable bit won't
1013                  * take. So the only way to tell is attempt to enable
1014                  * it and see what happens.
1015                  */
1016                 intel_de_write(dev_priv, adpa_reg,
1017                                adpa | ADPA_DAC_ENABLE | ADPA_HSYNC_CNTL_DISABLE | ADPA_VSYNC_CNTL_DISABLE);
1018                 if ((intel_de_read(dev_priv, adpa_reg) & ADPA_DAC_ENABLE) == 0)
1019                         return;
1020                 intel_de_write(dev_priv, adpa_reg, adpa);
1021         }
1022
1023         crt = kzalloc(sizeof(struct intel_crt), GFP_KERNEL);
1024         if (!crt)
1025                 return;
1026
1027         intel_connector = intel_connector_alloc();
1028         if (!intel_connector) {
1029                 kfree(crt);
1030                 return;
1031         }
1032
1033         connector = &intel_connector->base;
1034         crt->connector = intel_connector;
1035         drm_connector_init(&dev_priv->drm, &intel_connector->base,
1036                            &intel_crt_connector_funcs, DRM_MODE_CONNECTOR_VGA);
1037
1038         drm_encoder_init(&dev_priv->drm, &crt->base.base, &intel_crt_enc_funcs,
1039                          DRM_MODE_ENCODER_DAC, "CRT");
1040
1041         intel_connector_attach_encoder(intel_connector, &crt->base);
1042
1043         crt->base.type = INTEL_OUTPUT_ANALOG;
1044         crt->base.cloneable = BIT(INTEL_OUTPUT_DVO) | BIT(INTEL_OUTPUT_HDMI);
1045         if (IS_I830(dev_priv))
1046                 crt->base.pipe_mask = BIT(PIPE_A);
1047         else
1048                 crt->base.pipe_mask = ~0;
1049
1050         if (DISPLAY_VER(dev_priv) != 2)
1051                 connector->interlace_allowed = true;
1052
1053         crt->adpa_reg = adpa_reg;
1054
1055         crt->base.power_domain = POWER_DOMAIN_PORT_CRT;
1056
1057         if (I915_HAS_HOTPLUG(dev_priv) &&
1058             !dmi_check_system(intel_spurious_crt_detect)) {
1059                 crt->base.hpd_pin = HPD_CRT;
1060                 crt->base.hotplug = intel_encoder_hotplug;
1061                 intel_connector->polled = DRM_CONNECTOR_POLL_HPD;
1062         } else {
1063                 intel_connector->polled = DRM_CONNECTOR_POLL_CONNECT;
1064         }
1065
1066         if (HAS_DDI(dev_priv)) {
1067                 crt->base.port = PORT_E;
1068                 crt->base.get_config = hsw_crt_get_config;
1069                 crt->base.get_hw_state = intel_ddi_get_hw_state;
1070                 crt->base.compute_config = hsw_crt_compute_config;
1071                 crt->base.pre_pll_enable = hsw_pre_pll_enable_crt;
1072                 crt->base.pre_enable = hsw_pre_enable_crt;
1073                 crt->base.enable = hsw_enable_crt;
1074                 crt->base.disable = hsw_disable_crt;
1075                 crt->base.post_disable = hsw_post_disable_crt;
1076                 crt->base.enable_clock = hsw_ddi_enable_clock;
1077                 crt->base.disable_clock = hsw_ddi_disable_clock;
1078                 crt->base.is_clock_enabled = hsw_ddi_is_clock_enabled;
1079
1080                 intel_ddi_buf_trans_init(&crt->base);
1081         } else {
1082                 if (HAS_PCH_SPLIT(dev_priv)) {
1083                         crt->base.compute_config = pch_crt_compute_config;
1084                         crt->base.disable = pch_disable_crt;
1085                         crt->base.post_disable = pch_post_disable_crt;
1086                 } else {
1087                         crt->base.compute_config = intel_crt_compute_config;
1088                         crt->base.disable = intel_disable_crt;
1089                 }
1090                 crt->base.port = PORT_NONE;
1091                 crt->base.get_config = intel_crt_get_config;
1092                 crt->base.get_hw_state = intel_crt_get_hw_state;
1093                 crt->base.enable = intel_enable_crt;
1094         }
1095         intel_connector->get_hw_state = intel_connector_get_hw_state;
1096
1097         drm_connector_helper_add(connector, &intel_crt_connector_helper_funcs);
1098
1099         /*
1100          * TODO: find a proper way to discover whether we need to set the the
1101          * polarity and link reversal bits or not, instead of relying on the
1102          * BIOS.
1103          */
1104         if (HAS_PCH_LPT(dev_priv)) {
1105                 u32 fdi_config = FDI_RX_POLARITY_REVERSED_LPT |
1106                                  FDI_RX_LINK_REVERSAL_OVERRIDE;
1107
1108                 dev_priv->display.fdi.rx_config = intel_de_read(dev_priv,
1109                                                                 FDI_RX_CTL(PIPE_A)) & fdi_config;
1110         }
1111
1112         intel_crt_reset(&crt->base.base);
1113 }