drivers/gpu/drm/i915/intel_dp.c

   1 /*
   2  * Copyright © 2008 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 DEALINGS
  21  * IN THE SOFTWARE.
  22  *
  23  * Authors:
  24  *    Keith Packard <keithp@keithp.com>
  25  *
  26  */
  27
  28 #include <linux/i2c.h>
  29 #include <linux/slab.h>
  30 #include "drmP.h"
  31 #include "drm.h"
  32 #include "drm_crtc.h"
  33 #include "drm_crtc_helper.h"
  34 #include "intel_drv.h"
  35 #include "i915_drm.h"
  36 #include "i915_drv.h"
  37 #include "drm_dp_helper.h"
  38
  39
  40 #define DP_LINK_STATUS_SIZE     6
  41 #define DP_LINK_CHECK_TIMEOUT   (10 * 1000)
  42
  43 #define DP_LINK_CONFIGURATION_SIZE      9
  44
  45 #define IS_eDP(i) ((i)->type == INTEL_OUTPUT_EDP)
  46
  47 struct intel_dp_priv {
  48         uint32_t output_reg;
  49         uint32_t DP;
  50         uint8_t  link_configuration[DP_LINK_CONFIGURATION_SIZE];
  51         uint32_t save_DP;
  52         uint8_t  save_link_configuration[DP_LINK_CONFIGURATION_SIZE];
  53         bool has_audio;
  54         int dpms_mode;
  55         uint8_t link_bw;
  56         uint8_t lane_count;
  57         uint8_t dpcd[4];
  58         struct intel_encoder *intel_encoder;
  59         struct i2c_adapter adapter;
  60         struct i2c_algo_dp_aux_data algo;
  61 };
  62
  63 static void
  64 intel_dp_link_train(struct intel_encoder *intel_encoder, uint32_t DP,
  65                     uint8_t link_configuration[DP_LINK_CONFIGURATION_SIZE]);
  66
  67 static void
  68 intel_dp_link_down(struct intel_encoder *intel_encoder, uint32_t DP);
  69
  70 void
  71 intel_edp_link_config (struct intel_encoder *intel_encoder,
  72                 int *lane_num, int *link_bw)
  73 {
  74         struct intel_dp_priv   *dp_priv = intel_encoder->dev_priv;
  75
  76         *lane_num = dp_priv->lane_count;
  77         if (dp_priv->link_bw == DP_LINK_BW_1_62)
  78                 *link_bw = 162000;
  79         else if (dp_priv->link_bw == DP_LINK_BW_2_7)
  80                 *link_bw = 270000;
  81 }
  82
  83 static int
  84 intel_dp_max_lane_count(struct intel_encoder *intel_encoder)
  85 {
  86         struct intel_dp_priv   *dp_priv = intel_encoder->dev_priv;
  87         int max_lane_count = 4;
  88
  89         if (dp_priv->dpcd[0] >= 0x11) {
  90                 max_lane_count = dp_priv->dpcd[2] & 0x1f;
  91                 switch (max_lane_count) {
  92                 case 1: case 2: case 4:
  93                         break;
  94                 default:
  95                         max_lane_count = 4;
  96                 }
  97         }
  98         return max_lane_count;
  99 }
 100
 101 static int
 102 intel_dp_max_link_bw(struct intel_encoder *intel_encoder)
 103 {
 104         struct intel_dp_priv   *dp_priv = intel_encoder->dev_priv;
 105         int max_link_bw = dp_priv->dpcd[1];
 106
 107         switch (max_link_bw) {
 108         case DP_LINK_BW_1_62:
 109         case DP_LINK_BW_2_7:
 110                 break;
 111         default:
 112                 max_link_bw = DP_LINK_BW_1_62;
 113                 break;
 114         }
 115         return max_link_bw;
 116 }
 117
 118 static int
 119 intel_dp_link_clock(uint8_t link_bw)
 120 {
 121         if (link_bw == DP_LINK_BW_2_7)
 122                 return 270000;
 123         else
 124                 return 162000;
 125 }
 126
 127 /* I think this is a fiction */
 128 static int
 129 intel_dp_link_required(struct drm_device *dev,
 130                        struct intel_encoder *intel_encoder, int pixel_clock)
 131 {
 132         struct drm_i915_private *dev_priv = dev->dev_private;
 133
 134         if (IS_eDP(intel_encoder))
 135                 return (pixel_clock * dev_priv->edp_bpp) / 8;
 136         else
 137                 return pixel_clock * 3;
 138 }
 139
 140 static int
 141 intel_dp_mode_valid(struct drm_connector *connector,
 142                     struct drm_display_mode *mode)
 143 {
 144         struct intel_encoder *intel_encoder = to_intel_encoder(connector);
 145         int max_link_clock = intel_dp_link_clock(intel_dp_max_link_bw(intel_encoder));
 146         int max_lanes = intel_dp_max_lane_count(intel_encoder);
 147
 148         if (intel_dp_link_required(connector->dev, intel_encoder, mode->clock)
 149                         > max_link_clock * max_lanes)
 150                 return MODE_CLOCK_HIGH;
 151
 152         if (mode->clock < 10000)
 153                 return MODE_CLOCK_LOW;
 154
 155         return MODE_OK;
 156 }
 157
 158 static uint32_t
 159 pack_aux(uint8_t *src, int src_bytes)
 160 {
 161         int     i;
 162         uint32_t v = 0;
 163
 164         if (src_bytes > 4)
 165                 src_bytes = 4;
 166         for (i = 0; i < src_bytes; i++)
 167                 v |= ((uint32_t) src[i]) << ((3-i) * 8);
 168         return v;
 169 }
 170
 171 static void
 172 unpack_aux(uint32_t src, uint8_t *dst, int dst_bytes)
 173 {
 174         int i;
 175         if (dst_bytes > 4)
 176                 dst_bytes = 4;
 177         for (i = 0; i < dst_bytes; i++)
 178                 dst[i] = src >> ((3-i) * 8);
 179 }
 180
 181 /* hrawclock is 1/4 the FSB frequency */
 182 static int
 183 intel_hrawclk(struct drm_device *dev)
 184 {
 185         struct drm_i915_private *dev_priv = dev->dev_private;
 186         uint32_t clkcfg;
 187
 188         clkcfg = I915_READ(CLKCFG);
 189         switch (clkcfg & CLKCFG_FSB_MASK) {
 190         case CLKCFG_FSB_400:
 191                 return 100;
 192         case CLKCFG_FSB_533:
 193                 return 133;
 194         case CLKCFG_FSB_667:
 195                 return 166;
 196         case CLKCFG_FSB_800:
 197                 return 200;
 198         case CLKCFG_FSB_1067:
 199                 return 266;
 200         case CLKCFG_FSB_1333:
 201                 return 333;
 202         /* these two are just a guess; one of them might be right */
 203         case CLKCFG_FSB_1600:
 204         case CLKCFG_FSB_1600_ALT:
 205                 return 400;
 206         default:
 207                 return 133;
 208         }
 209 }
 210
 211 static int
 212 intel_dp_aux_ch(struct intel_encoder *intel_encoder,
 213                 uint8_t *send, int send_bytes,
 214                 uint8_t *recv, int recv_size)
 215 {
 216         struct intel_dp_priv *dp_priv = intel_encoder->dev_priv;
 217         uint32_t output_reg = dp_priv->output_reg;
 218         struct drm_device *dev = intel_encoder->base.dev;
 219         struct drm_i915_private *dev_priv = dev->dev_private;
 220         uint32_t ch_ctl = output_reg + 0x10;
 221         uint32_t ch_data = ch_ctl + 4;
 222         int i;
 223         int recv_bytes;
 224         uint32_t ctl;
 225         uint32_t status;
 226         uint32_t aux_clock_divider;
 227         int try;
 228
 229         /* The clock divider is based off the hrawclk,
 230          * and would like to run at 2MHz. So, take the
 231          * hrawclk value and divide by 2 and use that
 232          */
 233         if (IS_eDP(intel_encoder))
 234                 aux_clock_divider = 225; /* eDP input clock at 450Mhz */
 235         else if (HAS_PCH_SPLIT(dev))
 236                 aux_clock_divider = 62; /* IRL input clock fixed at 125Mhz */
 237         else
 238                 aux_clock_divider = intel_hrawclk(dev) / 2;
 239
 240         /* Must try at least 3 times according to DP spec */
 241         for (try = 0; try < 5; try++) {
 242                 /* Load the send data into the aux channel data registers */
 243                 for (i = 0; i < send_bytes; i += 4) {
 244                         uint32_t    d = pack_aux(send + i, send_bytes - i);
 245
 246                         I915_WRITE(ch_data + i, d);
 247                 }
 248
 249                 ctl = (DP_AUX_CH_CTL_SEND_BUSY |
 250                        DP_AUX_CH_CTL_TIME_OUT_400us |
 251                        (send_bytes << DP_AUX_CH_CTL_MESSAGE_SIZE_SHIFT) |
 252                        (5 << DP_AUX_CH_CTL_PRECHARGE_2US_SHIFT) |
 253                        (aux_clock_divider << DP_AUX_CH_CTL_BIT_CLOCK_2X_SHIFT) |
 254                        DP_AUX_CH_CTL_DONE |
 255                        DP_AUX_CH_CTL_TIME_OUT_ERROR |
 256                        DP_AUX_CH_CTL_RECEIVE_ERROR);
 257
 258                 /* Send the command and wait for it to complete */
 259                 I915_WRITE(ch_ctl, ctl);
 260                 (void) I915_READ(ch_ctl);
 261                 for (;;) {
 262                         udelay(100);
 263                         status = I915_READ(ch_ctl);
 264                         if ((status & DP_AUX_CH_CTL_SEND_BUSY) == 0)
 265                                 break;
 266                 }
 267
 268                 /* Clear done status and any errors */
 269                 I915_WRITE(ch_ctl, (status |
 270                                 DP_AUX_CH_CTL_DONE |
 271                                 DP_AUX_CH_CTL_TIME_OUT_ERROR |
 272                                 DP_AUX_CH_CTL_RECEIVE_ERROR));
 273                 (void) I915_READ(ch_ctl);
 274                 if ((status & DP_AUX_CH_CTL_TIME_OUT_ERROR) == 0)
 275                         break;
 276         }
 277
 278         if ((status & DP_AUX_CH_CTL_DONE) == 0) {
 279                 DRM_ERROR("dp_aux_ch not done status 0x%08x\n", status);
 280                 return -EBUSY;
 281         }
 282
 283         /* Check for timeout or receive error.
 284          * Timeouts occur when the sink is not connected
 285          */
 286         if (status & DP_AUX_CH_CTL_RECEIVE_ERROR) {
 287                 DRM_ERROR("dp_aux_ch receive error status 0x%08x\n", status);
 288                 return -EIO;
 289         }
 290
 291         /* Timeouts occur when the device isn't connected, so they're
 292          * "normal" -- don't fill the kernel log with these */
 293         if (status & DP_AUX_CH_CTL_TIME_OUT_ERROR) {
 294                 DRM_DEBUG_KMS("dp_aux_ch timeout status 0x%08x\n", status);
 295                 return -ETIMEDOUT;
 296         }
 297
 298         /* Unload any bytes sent back from the other side */
 299         recv_bytes = ((status & DP_AUX_CH_CTL_MESSAGE_SIZE_MASK) >>
 300                       DP_AUX_CH_CTL_MESSAGE_SIZE_SHIFT);
 301
 302         if (recv_bytes > recv_size)
 303                 recv_bytes = recv_size;
 304
 305         for (i = 0; i < recv_bytes; i += 4) {
 306                 uint32_t    d = I915_READ(ch_data + i);
 307
 308                 unpack_aux(d, recv + i, recv_bytes - i);
 309         }
 310
 311         return recv_bytes;
 312 }
 313
 314 /* Write data to the aux channel in native mode */
 315 static int
 316 intel_dp_aux_native_write(struct intel_encoder *intel_encoder,
 317                           uint16_t address, uint8_t *send, int send_bytes)
 318 {
 319         int ret;
 320         uint8_t msg[20];
 321         int msg_bytes;
 322         uint8_t ack;
 323
 324         if (send_bytes > 16)
 325                 return -1;
 326         msg[0] = AUX_NATIVE_WRITE << 4;
 327         msg[1] = address >> 8;
 328         msg[2] = address & 0xff;
 329         msg[3] = send_bytes - 1;
 330         memcpy(&msg[4], send, send_bytes);
 331         msg_bytes = send_bytes + 4;
 332         for (;;) {
 333                 ret = intel_dp_aux_ch(intel_encoder, msg, msg_bytes, &ack, 1);
 334                 if (ret < 0)
 335                         return ret;
 336                 if ((ack & AUX_NATIVE_REPLY_MASK) == AUX_NATIVE_REPLY_ACK)
 337                         break;
 338                 else if ((ack & AUX_NATIVE_REPLY_MASK) == AUX_NATIVE_REPLY_DEFER)
 339                         udelay(100);
 340                 else
 341                         return -EIO;
 342         }
 343         return send_bytes;
 344 }
 345
 346 /* Write a single byte to the aux channel in native mode */
 347 static int
 348 intel_dp_aux_native_write_1(struct intel_encoder *intel_encoder,
 349                             uint16_t address, uint8_t byte)
 350 {
 351         return intel_dp_aux_native_write(intel_encoder, address, &byte, 1);
 352 }
 353
 354 /* read bytes from a native aux channel */
 355 static int
 356 intel_dp_aux_native_read(struct intel_encoder *intel_encoder,
 357                          uint16_t address, uint8_t *recv, int recv_bytes)
 358 {
 359         uint8_t msg[4];
 360         int msg_bytes;
 361         uint8_t reply[20];
 362         int reply_bytes;
 363         uint8_t ack;
 364         int ret;
 365
 366         msg[0] = AUX_NATIVE_READ << 4;
 367         msg[1] = address >> 8;
 368         msg[2] = address & 0xff;
 369         msg[3] = recv_bytes - 1;
 370
 371         msg_bytes = 4;
 372         reply_bytes = recv_bytes + 1;
 373
 374         for (;;) {
 375                 ret = intel_dp_aux_ch(intel_encoder, msg, msg_bytes,
 376                                       reply, reply_bytes);
 377                 if (ret == 0)
 378                         return -EPROTO;
 379                 if (ret < 0)
 380                         return ret;
 381                 ack = reply[0];
 382                 if ((ack & AUX_NATIVE_REPLY_MASK) == AUX_NATIVE_REPLY_ACK) {
 383                         memcpy(recv, reply + 1, ret - 1);
 384                         return ret - 1;
 385                 }
 386                 else if ((ack & AUX_NATIVE_REPLY_MASK) == AUX_NATIVE_REPLY_DEFER)
 387                         udelay(100);
 388                 else
 389                         return -EIO;
 390         }
 391 }
 392
 393 static int
 394 intel_dp_i2c_aux_ch(struct i2c_adapter *adapter, int mode,
 395                     uint8_t write_byte, uint8_t *read_byte)
 396 {
 397         struct i2c_algo_dp_aux_data *algo_data = adapter->algo_data;
 398         struct intel_dp_priv *dp_priv = container_of(adapter,
 399                                                      struct intel_dp_priv,
 400                                                      adapter);
 401         struct intel_encoder *intel_encoder = dp_priv->intel_encoder;
 402         uint16_t address = algo_data->address;
 403         uint8_t msg[5];
 404         uint8_t reply[2];
 405         int msg_bytes;
 406         int reply_bytes;
 407         int ret;
 408
 409         /* Set up the command byte */
 410         if (mode & MODE_I2C_READ)
 411                 msg[0] = AUX_I2C_READ << 4;
 412         else
 413                 msg[0] = AUX_I2C_WRITE << 4;
 414
 415         if (!(mode & MODE_I2C_STOP))
 416                 msg[0] |= AUX_I2C_MOT << 4;
 417
 418         msg[1] = address >> 8;
 419         msg[2] = address;
 420
 421         switch (mode) {
 422         case MODE_I2C_WRITE:
 423                 msg[3] = 0;
 424                 msg[4] = write_byte;
 425                 msg_bytes = 5;
 426                 reply_bytes = 1;
 427                 break;
 428         case MODE_I2C_READ:
 429                 msg[3] = 0;
 430                 msg_bytes = 4;
 431                 reply_bytes = 2;
 432                 break;
 433         default:
 434                 msg_bytes = 3;
 435                 reply_bytes = 1;
 436                 break;
 437         }
 438
 439         for (;;) {
 440           ret = intel_dp_aux_ch(intel_encoder,
 441                                 msg, msg_bytes,
 442                                 reply, reply_bytes);
 443                 if (ret < 0) {
 444                         DRM_DEBUG_KMS("aux_ch failed %d\n", ret);
 445                         return ret;
 446                 }
 447                 switch (reply[0] & AUX_I2C_REPLY_MASK) {
 448                 case AUX_I2C_REPLY_ACK:
 449                         if (mode == MODE_I2C_READ) {
 450                                 *read_byte = reply[1];
 451                         }
 452                         return reply_bytes - 1;
 453                 case AUX_I2C_REPLY_NACK:
 454                         DRM_DEBUG_KMS("aux_ch nack\n");
 455                         return -EREMOTEIO;
 456                 case AUX_I2C_REPLY_DEFER:
 457                         DRM_DEBUG_KMS("aux_ch defer\n");
 458                         udelay(100);
 459                         break;
 460                 default:
 461                         DRM_ERROR("aux_ch invalid reply 0x%02x\n", reply[0]);
 462                         return -EREMOTEIO;
 463                 }
 464         }
 465 }
 466
 467 static int
 468 intel_dp_i2c_init(struct intel_encoder *intel_encoder, const char *name)
 469 {
 470         struct intel_dp_priv   *dp_priv = intel_encoder->dev_priv;
 471
 472         DRM_DEBUG_KMS("i2c_init %s\n", name);
 473         dp_priv->algo.running = false;
 474         dp_priv->algo.address = 0;
 475         dp_priv->algo.aux_ch = intel_dp_i2c_aux_ch;
 476
 477         memset(&dp_priv->adapter, '\0', sizeof (dp_priv->adapter));
 478         dp_priv->adapter.owner = THIS_MODULE;
 479         dp_priv->adapter.class = I2C_CLASS_DDC;
 480         strncpy (dp_priv->adapter.name, name, sizeof(dp_priv->adapter.name) - 1);
 481         dp_priv->adapter.name[sizeof(dp_priv->adapter.name) - 1] = '\0';
 482         dp_priv->adapter.algo_data = &dp_priv->algo;
 483         dp_priv->adapter.dev.parent = &intel_encoder->base.kdev;
 484
 485         return i2c_dp_aux_add_bus(&dp_priv->adapter);
 486 }
 487
 488 static bool
 489 intel_dp_mode_fixup(struct drm_encoder *encoder, struct drm_display_mode *mode,
 490                     struct drm_display_mode *adjusted_mode)
 491 {
 492         struct intel_encoder *intel_encoder = enc_to_intel_encoder(encoder);
 493         struct intel_dp_priv   *dp_priv = intel_encoder->dev_priv;
 494         int lane_count, clock;
 495         int max_lane_count = intel_dp_max_lane_count(intel_encoder);
 496         int max_clock = intel_dp_max_link_bw(intel_encoder) == DP_LINK_BW_2_7 ? 1 : 0;
 497         static int bws[2] = { DP_LINK_BW_1_62, DP_LINK_BW_2_7 };
 498
 499         for (lane_count = 1; lane_count <= max_lane_count; lane_count <<= 1) {
 500                 for (clock = 0; clock <= max_clock; clock++) {
 501                         int link_avail = intel_dp_link_clock(bws[clock]) * lane_count;
 502
 503                         if (intel_dp_link_required(encoder->dev, intel_encoder, mode->clock)
 504                                         <= link_avail) {
 505                                 dp_priv->link_bw = bws[clock];
 506                                 dp_priv->lane_count = lane_count;
 507                                 adjusted_mode->clock = intel_dp_link_clock(dp_priv->link_bw);
 508                                 DRM_DEBUG_KMS("Display port link bw %02x lane "
 509                                                 "count %d clock %d\n",
 510                                        dp_priv->link_bw, dp_priv->lane_count,
 511                                        adjusted_mode->clock);
 512                                 return true;
 513                         }
 514                 }
 515         }
 516         return false;
 517 }
 518
 519 struct intel_dp_m_n {
 520         uint32_t        tu;
 521         uint32_t        gmch_m;
 522         uint32_t        gmch_n;
 523         uint32_t        link_m;
 524         uint32_t        link_n;
 525 };
 526
 527 static void
 528 intel_reduce_ratio(uint32_t *num, uint32_t *den)
 529 {
 530         while (*num > 0xffffff || *den > 0xffffff) {
 531                 *num >>= 1;
 532                 *den >>= 1;
 533         }
 534 }
 535
 536 static void
 537 intel_dp_compute_m_n(int bytes_per_pixel,
 538                      int nlanes,
 539                      int pixel_clock,
 540                      int link_clock,
 541                      struct intel_dp_m_n *m_n)
 542 {
 543         m_n->tu = 64;
 544         m_n->gmch_m = pixel_clock * bytes_per_pixel;
 545         m_n->gmch_n = link_clock * nlanes;
 546         intel_reduce_ratio(&m_n->gmch_m, &m_n->gmch_n);
 547         m_n->link_m = pixel_clock;
 548         m_n->link_n = link_clock;
 549         intel_reduce_ratio(&m_n->link_m, &m_n->link_n);
 550 }
 551
 552 void
 553 intel_dp_set_m_n(struct drm_crtc *crtc, struct drm_display_mode *mode,
 554                  struct drm_display_mode *adjusted_mode)
 555 {
 556         struct drm_device *dev = crtc->dev;
 557         struct drm_mode_config *mode_config = &dev->mode_config;
 558         struct drm_connector *connector;
 559         struct drm_i915_private *dev_priv = dev->dev_private;
 560         struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
 561         int lane_count = 4;
 562         struct intel_dp_m_n m_n;
 563
 564         /*
 565          * Find the lane count in the intel_encoder private
 566          */
 567         list_for_each_entry(connector, &mode_config->connector_list, head) {
 568                 struct intel_encoder *intel_encoder = to_intel_encoder(connector);
 569                 struct intel_dp_priv *dp_priv = intel_encoder->dev_priv;
 570
 571                 if (!connector->encoder || connector->encoder->crtc != crtc)
 572                         continue;
 573
 574                 if (intel_encoder->type == INTEL_OUTPUT_DISPLAYPORT) {
 575                         lane_count = dp_priv->lane_count;
 576                         break;
 577                 }
 578         }
 579
 580         /*
 581          * Compute the GMCH and Link ratios. The '3' here is
 582          * the number of bytes_per_pixel post-LUT, which we always
 583          * set up for 8-bits of R/G/B, or 3 bytes total.
 584          */
 585         intel_dp_compute_m_n(3, lane_count,
 586                              mode->clock, adjusted_mode->clock, &m_n);
 587
 588         if (HAS_PCH_SPLIT(dev)) {
 589                 if (intel_crtc->pipe == 0) {
 590                         I915_WRITE(TRANSA_DATA_M1,
 591                                    ((m_n.tu - 1) << PIPE_GMCH_DATA_M_TU_SIZE_SHIFT) |
 592                                    m_n.gmch_m);
 593                         I915_WRITE(TRANSA_DATA_N1, m_n.gmch_n);
 594                         I915_WRITE(TRANSA_DP_LINK_M1, m_n.link_m);
 595                         I915_WRITE(TRANSA_DP_LINK_N1, m_n.link_n);
 596                 } else {
 597                         I915_WRITE(TRANSB_DATA_M1,
 598                                    ((m_n.tu - 1) << PIPE_GMCH_DATA_M_TU_SIZE_SHIFT) |
 599                                    m_n.gmch_m);
 600                         I915_WRITE(TRANSB_DATA_N1, m_n.gmch_n);
 601                         I915_WRITE(TRANSB_DP_LINK_M1, m_n.link_m);
 602                         I915_WRITE(TRANSB_DP_LINK_N1, m_n.link_n);
 603                 }
 604         } else {
 605                 if (intel_crtc->pipe == 0) {
 606                         I915_WRITE(PIPEA_GMCH_DATA_M,
 607                                    ((m_n.tu - 1) << PIPE_GMCH_DATA_M_TU_SIZE_SHIFT) |
 608                                    m_n.gmch_m);
 609                         I915_WRITE(PIPEA_GMCH_DATA_N,
 610                                    m_n.gmch_n);
 611                         I915_WRITE(PIPEA_DP_LINK_M, m_n.link_m);
 612                         I915_WRITE(PIPEA_DP_LINK_N, m_n.link_n);
 613                 } else {
 614                         I915_WRITE(PIPEB_GMCH_DATA_M,
 615                                    ((m_n.tu - 1) << PIPE_GMCH_DATA_M_TU_SIZE_SHIFT) |
 616                                    m_n.gmch_m);
 617                         I915_WRITE(PIPEB_GMCH_DATA_N,
 618                                         m_n.gmch_n);
 619                         I915_WRITE(PIPEB_DP_LINK_M, m_n.link_m);
 620                         I915_WRITE(PIPEB_DP_LINK_N, m_n.link_n);
 621                 }
 622         }
 623 }
 624
 625 static void
 626 intel_dp_mode_set(struct drm_encoder *encoder, struct drm_display_mode *mode,
 627                   struct drm_display_mode *adjusted_mode)
 628 {
 629         struct intel_encoder *intel_encoder = enc_to_intel_encoder(encoder);
 630         struct intel_dp_priv *dp_priv = intel_encoder->dev_priv;
 631         struct drm_crtc *crtc = intel_encoder->enc.crtc;
 632         struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
 633
 634         dp_priv->DP = (DP_LINK_TRAIN_OFF |
 635                         DP_VOLTAGE_0_4 |
 636                         DP_PRE_EMPHASIS_0 |
 637                         DP_SYNC_VS_HIGH |
 638                         DP_SYNC_HS_HIGH);
 639
 640         switch (dp_priv->lane_count) {
 641         case 1:
 642                 dp_priv->DP |= DP_PORT_WIDTH_1;
 643                 break;
 644         case 2:
 645                 dp_priv->DP |= DP_PORT_WIDTH_2;
 646                 break;
 647         case 4:
 648                 dp_priv->DP |= DP_PORT_WIDTH_4;
 649                 break;
 650         }
 651         if (dp_priv->has_audio)
 652                 dp_priv->DP |= DP_AUDIO_OUTPUT_ENABLE;
 653
 654         memset(dp_priv->link_configuration, 0, DP_LINK_CONFIGURATION_SIZE);
 655         dp_priv->link_configuration[0] = dp_priv->link_bw;
 656         dp_priv->link_configuration[1] = dp_priv->lane_count;
 657
 658         /*
 659          * Check for DPCD version > 1.1,
 660          * enable enahanced frame stuff in that case
 661          */
 662         if (dp_priv->dpcd[0] >= 0x11) {
 663                 dp_priv->link_configuration[1] |= DP_LANE_COUNT_ENHANCED_FRAME_EN;
 664                 dp_priv->DP |= DP_ENHANCED_FRAMING;
 665         }
 666
 667         if (intel_crtc->pipe == 1)
 668                 dp_priv->DP |= DP_PIPEB_SELECT;
 669
 670         if (IS_eDP(intel_encoder)) {
 671                 /* don't miss out required setting for eDP */
 672                 dp_priv->DP |= DP_PLL_ENABLE;
 673                 if (adjusted_mode->clock < 200000)
 674                         dp_priv->DP |= DP_PLL_FREQ_160MHZ;
 675                 else
 676                         dp_priv->DP |= DP_PLL_FREQ_270MHZ;
 677         }
 678 }
 679
 680 static void ironlake_edp_panel_on (struct drm_device *dev)
 681 {
 682         struct drm_i915_private *dev_priv = dev->dev_private;
 683         unsigned long timeout = jiffies + msecs_to_jiffies(5000);
 684         u32 pp, pp_status;
 685
 686         pp_status = I915_READ(PCH_PP_STATUS);
 687         if (pp_status & PP_ON)
 688                 return;
 689
 690         pp = I915_READ(PCH_PP_CONTROL);
 691         pp |= PANEL_UNLOCK_REGS | POWER_TARGET_ON;
 692         I915_WRITE(PCH_PP_CONTROL, pp);
 693         do {
 694                 pp_status = I915_READ(PCH_PP_STATUS);
 695         } while (((pp_status & PP_ON) == 0) && !time_after(jiffies, timeout));
 696
 697         if (time_after(jiffies, timeout))
 698                 DRM_DEBUG_KMS("panel on wait timed out: 0x%08x\n", pp_status);
 699
 700         pp &= ~(PANEL_UNLOCK_REGS | EDP_FORCE_VDD);
 701         I915_WRITE(PCH_PP_CONTROL, pp);
 702 }
 703
 704 static void ironlake_edp_panel_off (struct drm_device *dev)
 705 {
 706         struct drm_i915_private *dev_priv = dev->dev_private;
 707         unsigned long timeout = jiffies + msecs_to_jiffies(5000);
 708         u32 pp, pp_status;
 709
 710         pp = I915_READ(PCH_PP_CONTROL);
 711         pp &= ~POWER_TARGET_ON;
 712         I915_WRITE(PCH_PP_CONTROL, pp);
 713         do {
 714                 pp_status = I915_READ(PCH_PP_STATUS);
 715         } while ((pp_status & PP_ON) && !time_after(jiffies, timeout));
 716
 717         if (time_after(jiffies, timeout))
 718                 DRM_DEBUG_KMS("panel off wait timed out\n");
 719
 720         /* Make sure VDD is enabled so DP AUX will work */
 721         pp |= EDP_FORCE_VDD;
 722         I915_WRITE(PCH_PP_CONTROL, pp);
 723 }
 724
 725 static void ironlake_edp_backlight_on (struct drm_device *dev)
 726 {
 727         struct drm_i915_private *dev_priv = dev->dev_private;
 728         u32 pp;
 729
 730         DRM_DEBUG_KMS("\n");
 731         pp = I915_READ(PCH_PP_CONTROL);
 732         pp |= EDP_BLC_ENABLE;
 733         I915_WRITE(PCH_PP_CONTROL, pp);
 734 }
 735
 736 static void ironlake_edp_backlight_off (struct drm_device *dev)
 737 {
 738         struct drm_i915_private *dev_priv = dev->dev_private;
 739         u32 pp;
 740
 741         DRM_DEBUG_KMS("\n");
 742         pp = I915_READ(PCH_PP_CONTROL);
 743         pp &= ~EDP_BLC_ENABLE;
 744         I915_WRITE(PCH_PP_CONTROL, pp);
 745 }
 746
 747 static void
 748 intel_dp_dpms(struct drm_encoder *encoder, int mode)
 749 {
 750         struct intel_encoder *intel_encoder = enc_to_intel_encoder(encoder);
 751         struct intel_dp_priv *dp_priv = intel_encoder->dev_priv;
 752         struct drm_device *dev = intel_encoder->base.dev;
 753         struct drm_i915_private *dev_priv = dev->dev_private;
 754         uint32_t dp_reg = I915_READ(dp_priv->output_reg);
 755
 756         if (mode != DRM_MODE_DPMS_ON) {
 757                 if (dp_reg & DP_PORT_EN) {
 758                         intel_dp_link_down(intel_encoder, dp_priv->DP);
 759                         if (IS_eDP(intel_encoder)) {
 760                                 ironlake_edp_backlight_off(dev);
 761                                 ironlake_edp_backlight_off(dev);
 762                         }
 763                 }
 764         } else {
 765                 if (!(dp_reg & DP_PORT_EN)) {
 766                         intel_dp_link_train(intel_encoder, dp_priv->DP, dp_priv->link_configuration);
 767                         if (IS_eDP(intel_encoder)) {
 768                                 ironlake_edp_panel_on(dev);
 769                                 ironlake_edp_backlight_on(dev);
 770                         }
 771                 }
 772         }
 773         dp_priv->dpms_mode = mode;
 774 }
 775
 776 /*
 777  * Fetch AUX CH registers 0x202 - 0x207 which contain
 778  * link status information
 779  */
 780 static bool
 781 intel_dp_get_link_status(struct intel_encoder *intel_encoder,
 782                          uint8_t link_status[DP_LINK_STATUS_SIZE])
 783 {
 784         int ret;
 785
 786         ret = intel_dp_aux_native_read(intel_encoder,
 787                                        DP_LANE0_1_STATUS,
 788                                        link_status, DP_LINK_STATUS_SIZE);
 789         if (ret != DP_LINK_STATUS_SIZE)
 790                 return false;
 791         return true;
 792 }
 793
 794 static uint8_t
 795 intel_dp_link_status(uint8_t link_status[DP_LINK_STATUS_SIZE],
 796                      int r)
 797 {
 798         return link_status[r - DP_LANE0_1_STATUS];
 799 }
 800
 801 static void
 802 intel_dp_save(struct drm_connector *connector)
 803 {
 804         struct intel_encoder *intel_encoder = to_intel_encoder(connector);
 805         struct drm_device *dev = intel_encoder->base.dev;
 806         struct drm_i915_private *dev_priv = dev->dev_private;
 807         struct intel_dp_priv *dp_priv = intel_encoder->dev_priv;
 808
 809         dp_priv->save_DP = I915_READ(dp_priv->output_reg);
 810         intel_dp_aux_native_read(intel_encoder, DP_LINK_BW_SET,
 811                                  dp_priv->save_link_configuration,
 812                                  sizeof (dp_priv->save_link_configuration));
 813 }
 814
 815 static uint8_t
 816 intel_get_adjust_request_voltage(uint8_t link_status[DP_LINK_STATUS_SIZE],
 817                                  int lane)
 818 {
 819         int         i = DP_ADJUST_REQUEST_LANE0_1 + (lane >> 1);
 820         int         s = ((lane & 1) ?
 821                          DP_ADJUST_VOLTAGE_SWING_LANE1_SHIFT :
 822                          DP_ADJUST_VOLTAGE_SWING_LANE0_SHIFT);
 823         uint8_t l = intel_dp_link_status(link_status, i);
 824
 825         return ((l >> s) & 3) << DP_TRAIN_VOLTAGE_SWING_SHIFT;
 826 }
 827
 828 static uint8_t
 829 intel_get_adjust_request_pre_emphasis(uint8_t link_status[DP_LINK_STATUS_SIZE],
 830                                       int lane)
 831 {
 832         int         i = DP_ADJUST_REQUEST_LANE0_1 + (lane >> 1);
 833         int         s = ((lane & 1) ?
 834                          DP_ADJUST_PRE_EMPHASIS_LANE1_SHIFT :
 835                          DP_ADJUST_PRE_EMPHASIS_LANE0_SHIFT);
 836         uint8_t l = intel_dp_link_status(link_status, i);
 837
 838         return ((l >> s) & 3) << DP_TRAIN_PRE_EMPHASIS_SHIFT;
 839 }
 840
 841
 842 #if 0
 843 static char     *voltage_names[] = {
 844         "0.4V", "0.6V", "0.8V", "1.2V"
 845 };
 846 static char     *pre_emph_names[] = {
 847         "0dB", "3.5dB", "6dB", "9.5dB"
 848 };
 849 static char     *link_train_names[] = {
 850         "pattern 1", "pattern 2", "idle", "off"
 851 };
 852 #endif
 853
 854 /*
 855  * These are source-specific values; current Intel hardware supports
 856  * a maximum voltage of 800mV and a maximum pre-emphasis of 6dB
 857  */
 858 #define I830_DP_VOLTAGE_MAX         DP_TRAIN_VOLTAGE_SWING_800
 859
 860 static uint8_t
 861 intel_dp_pre_emphasis_max(uint8_t voltage_swing)
 862 {
 863         switch (voltage_swing & DP_TRAIN_VOLTAGE_SWING_MASK) {
 864         case DP_TRAIN_VOLTAGE_SWING_400:
 865                 return DP_TRAIN_PRE_EMPHASIS_6;
 866         case DP_TRAIN_VOLTAGE_SWING_600:
 867                 return DP_TRAIN_PRE_EMPHASIS_6;
 868         case DP_TRAIN_VOLTAGE_SWING_800:
 869                 return DP_TRAIN_PRE_EMPHASIS_3_5;
 870         case DP_TRAIN_VOLTAGE_SWING_1200:
 871         default:
 872                 return DP_TRAIN_PRE_EMPHASIS_0;
 873         }
 874 }
 875
 876 static void
 877 intel_get_adjust_train(struct intel_encoder *intel_encoder,
 878                        uint8_t link_status[DP_LINK_STATUS_SIZE],
 879                        int lane_count,
 880                        uint8_t train_set[4])
 881 {
 882         uint8_t v = 0;
 883         uint8_t p = 0;
 884         int lane;
 885
 886         for (lane = 0; lane < lane_count; lane++) {
 887                 uint8_t this_v = intel_get_adjust_request_voltage(link_status, lane);
 888                 uint8_t this_p = intel_get_adjust_request_pre_emphasis(link_status, lane);
 889
 890                 if (this_v > v)
 891                         v = this_v;
 892                 if (this_p > p)
 893                         p = this_p;
 894         }
 895
 896         if (v >= I830_DP_VOLTAGE_MAX)
 897                 v = I830_DP_VOLTAGE_MAX | DP_TRAIN_MAX_SWING_REACHED;
 898
 899         if (p >= intel_dp_pre_emphasis_max(v))
 900                 p = intel_dp_pre_emphasis_max(v) | DP_TRAIN_MAX_PRE_EMPHASIS_REACHED;
 901
 902         for (lane = 0; lane < 4; lane++)
 903                 train_set[lane] = v | p;
 904 }
 905
 906 static uint32_t
 907 intel_dp_signal_levels(uint8_t train_set, int lane_count)
 908 {
 909         uint32_t        signal_levels = 0;
 910
 911         switch (train_set & DP_TRAIN_VOLTAGE_SWING_MASK) {
 912         case DP_TRAIN_VOLTAGE_SWING_400:
 913         default:
 914                 signal_levels |= DP_VOLTAGE_0_4;
 915                 break;
 916         case DP_TRAIN_VOLTAGE_SWING_600:
 917                 signal_levels |= DP_VOLTAGE_0_6;
 918                 break;
 919         case DP_TRAIN_VOLTAGE_SWING_800:
 920                 signal_levels |= DP_VOLTAGE_0_8;
 921                 break;
 922         case DP_TRAIN_VOLTAGE_SWING_1200:
 923                 signal_levels |= DP_VOLTAGE_1_2;
 924                 break;
 925         }
 926         switch (train_set & DP_TRAIN_PRE_EMPHASIS_MASK) {
 927         case DP_TRAIN_PRE_EMPHASIS_0:
 928         default:
 929                 signal_levels |= DP_PRE_EMPHASIS_0;
 930                 break;
 931         case DP_TRAIN_PRE_EMPHASIS_3_5:
 932                 signal_levels |= DP_PRE_EMPHASIS_3_5;
 933                 break;
 934         case DP_TRAIN_PRE_EMPHASIS_6:
 935                 signal_levels |= DP_PRE_EMPHASIS_6;
 936                 break;
 937         case DP_TRAIN_PRE_EMPHASIS_9_5:
 938                 signal_levels |= DP_PRE_EMPHASIS_9_5;
 939                 break;
 940         }
 941         return signal_levels;
 942 }
 943
 944 static uint8_t
 945 intel_get_lane_status(uint8_t link_status[DP_LINK_STATUS_SIZE],
 946                       int lane)
 947 {
 948         int i = DP_LANE0_1_STATUS + (lane >> 1);
 949         int s = (lane & 1) * 4;
 950         uint8_t l = intel_dp_link_status(link_status, i);
 951
 952         return (l >> s) & 0xf;
 953 }
 954
 955 /* Check for clock recovery is done on all channels */
 956 static bool
 957 intel_clock_recovery_ok(uint8_t link_status[DP_LINK_STATUS_SIZE], int lane_count)
 958 {
 959         int lane;
 960         uint8_t lane_status;
 961
 962         for (lane = 0; lane < lane_count; lane++) {
 963                 lane_status = intel_get_lane_status(link_status, lane);
 964                 if ((lane_status & DP_LANE_CR_DONE) == 0)
 965                         return false;
 966         }
 967         return true;
 968 }
 969
 970 /* Check to see if channel eq is done on all channels */
 971 #define CHANNEL_EQ_BITS (DP_LANE_CR_DONE|\
 972                          DP_LANE_CHANNEL_EQ_DONE|\
 973                          DP_LANE_SYMBOL_LOCKED)
 974 static bool
 975 intel_channel_eq_ok(uint8_t link_status[DP_LINK_STATUS_SIZE], int lane_count)
 976 {
 977         uint8_t lane_align;
 978         uint8_t lane_status;
 979         int lane;
 980
 981         lane_align = intel_dp_link_status(link_status,
 982                                           DP_LANE_ALIGN_STATUS_UPDATED);
 983         if ((lane_align & DP_INTERLANE_ALIGN_DONE) == 0)
 984                 return false;
 985         for (lane = 0; lane < lane_count; lane++) {
 986                 lane_status = intel_get_lane_status(link_status, lane);
 987                 if ((lane_status & CHANNEL_EQ_BITS) != CHANNEL_EQ_BITS)
 988                         return false;
 989         }
 990         return true;
 991 }
 992
 993 static bool
 994 intel_dp_set_link_train(struct intel_encoder *intel_encoder,
 995                         uint32_t dp_reg_value,
 996                         uint8_t dp_train_pat,
 997                         uint8_t train_set[4],
 998                         bool first)
 999 {
1000         struct drm_device *dev = intel_encoder->base.dev;
1001         struct drm_i915_private *dev_priv = dev->dev_private;
1002         struct intel_dp_priv *dp_priv = intel_encoder->dev_priv;
1003         int ret;
1004
1005         I915_WRITE(dp_priv->output_reg, dp_reg_value);
1006         POSTING_READ(dp_priv->output_reg);
1007         if (first)
1008                 intel_wait_for_vblank(dev);
1009
1010         intel_dp_aux_native_write_1(intel_encoder,
1011                                     DP_TRAINING_PATTERN_SET,
1012                                     dp_train_pat);
1013
1014         ret = intel_dp_aux_native_write(intel_encoder,
1015                                         DP_TRAINING_LANE0_SET, train_set, 4);
1016         if (ret != 4)
1017                 return false;
1018
1019         return true;
1020 }
1021
1022 static void
1023 intel_dp_link_train(struct intel_encoder *intel_encoder, uint32_t DP,
1024                     uint8_t link_configuration[DP_LINK_CONFIGURATION_SIZE])
1025 {
1026         struct drm_device *dev = intel_encoder->base.dev;
1027         struct drm_i915_private *dev_priv = dev->dev_private;
1028         struct intel_dp_priv *dp_priv = intel_encoder->dev_priv;
1029         uint8_t train_set[4];
1030         uint8_t link_status[DP_LINK_STATUS_SIZE];
1031         int i;
1032         uint8_t voltage;
1033         bool clock_recovery = false;
1034         bool channel_eq = false;
1035         bool first = true;
1036         int tries;
1037
1038         /* Write the link configuration data */
1039         intel_dp_aux_native_write(intel_encoder, 0x100,
1040                                   link_configuration, DP_LINK_CONFIGURATION_SIZE);
1041
1042         DP |= DP_PORT_EN;
1043         DP &= ~DP_LINK_TRAIN_MASK;
1044         memset(train_set, 0, 4);
1045         voltage = 0xff;
1046         tries = 0;
1047         clock_recovery = false;
1048         for (;;) {
1049                 /* Use train_set[0] to set the voltage and pre emphasis values */
1050                 uint32_t    signal_levels = intel_dp_signal_levels(train_set[0], dp_priv->lane_count);
1051                 DP = (DP & ~(DP_VOLTAGE_MASK|DP_PRE_EMPHASIS_MASK)) | signal_levels;
1052
1053                 if (!intel_dp_set_link_train(intel_encoder, DP | DP_LINK_TRAIN_PAT_1,
1054                                              DP_TRAINING_PATTERN_1, train_set, first))
1055                         break;
1056                 first = false;
1057                 /* Set training pattern 1 */
1058
1059                 udelay(100);
1060                 if (!intel_dp_get_link_status(intel_encoder, link_status))
1061                         break;
1062
1063                 if (intel_clock_recovery_ok(link_status, dp_priv->lane_count)) {
1064                         clock_recovery = true;
1065                         break;
1066                 }
1067
1068                 /* Check to see if we've tried the max voltage */
1069                 for (i = 0; i < dp_priv->lane_count; i++)
1070                         if ((train_set[i] & DP_TRAIN_MAX_SWING_REACHED) == 0)
1071                                 break;
1072                 if (i == dp_priv->lane_count)
1073                         break;
1074
1075                 /* Check to see if we've tried the same voltage 5 times */
1076                 if ((train_set[0] & DP_TRAIN_VOLTAGE_SWING_MASK) == voltage) {
1077                         ++tries;
1078                         if (tries == 5)
1079                                 break;
1080                 } else
1081                         tries = 0;
1082                 voltage = train_set[0] & DP_TRAIN_VOLTAGE_SWING_MASK;
1083
1084                 /* Compute new train_set as requested by target */
1085                 intel_get_adjust_train(intel_encoder, link_status, dp_priv->lane_count, train_set);
1086         }
1087
1088         /* channel equalization */
1089         tries = 0;
1090         channel_eq = false;
1091         for (;;) {
1092                 /* Use train_set[0] to set the voltage and pre emphasis values */
1093                 uint32_t    signal_levels = intel_dp_signal_levels(train_set[0], dp_priv->lane_count);
1094                 DP = (DP & ~(DP_VOLTAGE_MASK|DP_PRE_EMPHASIS_MASK)) | signal_levels;
1095
1096                 /* channel eq pattern */
1097                 if (!intel_dp_set_link_train(intel_encoder, DP | DP_LINK_TRAIN_PAT_2,
1098                                              DP_TRAINING_PATTERN_2, train_set,
1099                                              false))
1100                         break;
1101
1102                 udelay(400);
1103                 if (!intel_dp_get_link_status(intel_encoder, link_status))
1104                         break;
1105
1106                 if (intel_channel_eq_ok(link_status, dp_priv->lane_count)) {
1107                         channel_eq = true;
1108                         break;
1109                 }
1110
1111                 /* Try 5 times */
1112                 if (tries > 5)
1113                         break;
1114
1115                 /* Compute new train_set as requested by target */
1116                 intel_get_adjust_train(intel_encoder, link_status, dp_priv->lane_count, train_set);
1117                 ++tries;
1118         }
1119
1120         I915_WRITE(dp_priv->output_reg, DP | DP_LINK_TRAIN_OFF);
1121         POSTING_READ(dp_priv->output_reg);
1122         intel_dp_aux_native_write_1(intel_encoder,
1123                                     DP_TRAINING_PATTERN_SET, DP_TRAINING_PATTERN_DISABLE);
1124 }
1125
1126 static void
1127 intel_dp_link_down(struct intel_encoder *intel_encoder, uint32_t DP)
1128 {
1129         struct drm_device *dev = intel_encoder->base.dev;
1130         struct drm_i915_private *dev_priv = dev->dev_private;
1131         struct intel_dp_priv *dp_priv = intel_encoder->dev_priv;
1132
1133         DRM_DEBUG_KMS("\n");
1134
1135         if (IS_eDP(intel_encoder)) {
1136                 DP &= ~DP_PLL_ENABLE;
1137                 I915_WRITE(dp_priv->output_reg, DP);
1138                 POSTING_READ(dp_priv->output_reg);
1139                 udelay(100);
1140         }
1141
1142         DP &= ~DP_LINK_TRAIN_MASK;
1143         I915_WRITE(dp_priv->output_reg, DP | DP_LINK_TRAIN_PAT_IDLE);
1144         POSTING_READ(dp_priv->output_reg);
1145
1146         udelay(17000);
1147
1148         if (IS_eDP(intel_encoder))
1149                 DP |= DP_LINK_TRAIN_OFF;
1150         I915_WRITE(dp_priv->output_reg, DP & ~DP_PORT_EN);
1151         POSTING_READ(dp_priv->output_reg);
1152 }
1153
1154 static void
1155 intel_dp_restore(struct drm_connector *connector)
1156 {
1157         struct intel_encoder *intel_encoder = to_intel_encoder(connector);
1158         struct intel_dp_priv *dp_priv = intel_encoder->dev_priv;
1159
1160         if (dp_priv->save_DP & DP_PORT_EN)
1161                 intel_dp_link_train(intel_encoder, dp_priv->save_DP, dp_priv->save_link_configuration);
1162         else
1163                 intel_dp_link_down(intel_encoder,  dp_priv->save_DP);
1164 }
1165
1166 /*
1167  * According to DP spec
1168  * 5.1.2:
1169  *  1. Read DPCD
1170  *  2. Configure link according to Receiver Capabilities
1171  *  3. Use Link Training from 2.5.3.3 and 3.5.1.3
1172  *  4. Check link status on receipt of hot-plug interrupt
1173  */
1174
1175 static void
1176 intel_dp_check_link_status(struct intel_encoder *intel_encoder)
1177 {
1178         struct intel_dp_priv *dp_priv = intel_encoder->dev_priv;
1179         uint8_t link_status[DP_LINK_STATUS_SIZE];
1180
1181         if (!intel_encoder->enc.crtc)
1182                 return;
1183
1184         if (!intel_dp_get_link_status(intel_encoder, link_status)) {
1185                 intel_dp_link_down(intel_encoder, dp_priv->DP);
1186                 return;
1187         }
1188
1189         if (!intel_channel_eq_ok(link_status, dp_priv->lane_count))
1190                 intel_dp_link_train(intel_encoder, dp_priv->DP, dp_priv->link_configuration);
1191 }
1192
1193 static enum drm_connector_status
1194 ironlake_dp_detect(struct drm_connector *connector)
1195 {
1196         struct intel_encoder *intel_encoder = to_intel_encoder(connector);
1197         struct intel_dp_priv *dp_priv = intel_encoder->dev_priv;
1198         enum drm_connector_status status;
1199
1200         status = connector_status_disconnected;
1201         if (intel_dp_aux_native_read(intel_encoder,
1202                                      0x000, dp_priv->dpcd,
1203                                      sizeof (dp_priv->dpcd)) == sizeof (dp_priv->dpcd))
1204         {
1205                 if (dp_priv->dpcd[0] != 0)
1206                         status = connector_status_connected;
1207         }
1208         return status;
1209 }
1210
1211 /**
1212  * Uses CRT_HOTPLUG_EN and CRT_HOTPLUG_STAT to detect DP connection.
1213  *
1214  * \return true if DP port is connected.
1215  * \return false if DP port is disconnected.
1216  */
1217 static enum drm_connector_status
1218 intel_dp_detect(struct drm_connector *connector)
1219 {
1220         struct intel_encoder *intel_encoder = to_intel_encoder(connector);
1221         struct drm_device *dev = intel_encoder->base.dev;
1222         struct drm_i915_private *dev_priv = dev->dev_private;
1223         struct intel_dp_priv *dp_priv = intel_encoder->dev_priv;
1224         uint32_t temp, bit;
1225         enum drm_connector_status status;
1226
1227         dp_priv->has_audio = false;
1228
1229         if (HAS_PCH_SPLIT(dev))
1230                 return ironlake_dp_detect(connector);
1231
1232         switch (dp_priv->output_reg) {
1233         case DP_B:
1234                 bit = DPB_HOTPLUG_INT_STATUS;
1235                 break;
1236         case DP_C:
1237                 bit = DPC_HOTPLUG_INT_STATUS;
1238                 break;
1239         case DP_D:
1240                 bit = DPD_HOTPLUG_INT_STATUS;
1241                 break;
1242         default:
1243                 return connector_status_unknown;
1244         }
1245
1246         temp = I915_READ(PORT_HOTPLUG_STAT);
1247
1248         if ((temp & bit) == 0)
1249                 return connector_status_disconnected;
1250
1251         status = connector_status_disconnected;
1252         if (intel_dp_aux_native_read(intel_encoder,
1253                                      0x000, dp_priv->dpcd,
1254                                      sizeof (dp_priv->dpcd)) == sizeof (dp_priv->dpcd))
1255         {
1256                 if (dp_priv->dpcd[0] != 0)
1257                         status = connector_status_connected;
1258         }
1259         return status;
1260 }
1261
1262 static int intel_dp_get_modes(struct drm_connector *connector)
1263 {
1264         struct intel_encoder *intel_encoder = to_intel_encoder(connector);
1265         struct drm_device *dev = intel_encoder->base.dev;
1266         struct drm_i915_private *dev_priv = dev->dev_private;
1267         int ret;
1268
1269         /* We should parse the EDID data and find out if it has an audio sink
1270          */
1271
1272         ret = intel_ddc_get_modes(intel_encoder);
1273         if (ret)
1274                 return ret;
1275
1276         /* if eDP has no EDID, try to use fixed panel mode from VBT */
1277         if (IS_eDP(intel_encoder)) {
1278                 if (dev_priv->panel_fixed_mode != NULL) {
1279                         struct drm_display_mode *mode;
1280                         mode = drm_mode_duplicate(dev, dev_priv->panel_fixed_mode);
1281                         drm_mode_probed_add(connector, mode);
1282                         return 1;
1283                 }
1284         }
1285         return 0;
1286 }
1287
1288 static void
1289 intel_dp_destroy (struct drm_connector *connector)
1290 {
1291         struct intel_encoder *intel_encoder = to_intel_encoder(connector);
1292
1293         if (intel_encoder->i2c_bus)
1294                 intel_i2c_destroy(intel_encoder->i2c_bus);
1295         drm_sysfs_connector_remove(connector);
1296         drm_connector_cleanup(connector);
1297         kfree(intel_encoder);
1298 }
1299
1300 static const struct drm_encoder_helper_funcs intel_dp_helper_funcs = {
1301         .dpms = intel_dp_dpms,
1302         .mode_fixup = intel_dp_mode_fixup,
1303         .prepare = intel_encoder_prepare,
1304         .mode_set = intel_dp_mode_set,
1305         .commit = intel_encoder_commit,
1306 };
1307
1308 static const struct drm_connector_funcs intel_dp_connector_funcs = {
1309         .dpms = drm_helper_connector_dpms,
1310         .save = intel_dp_save,
1311         .restore = intel_dp_restore,
1312         .detect = intel_dp_detect,
1313         .fill_modes = drm_helper_probe_single_connector_modes,
1314         .destroy = intel_dp_destroy,
1315 };
1316
1317 static const struct drm_connector_helper_funcs intel_dp_connector_helper_funcs = {
1318         .get_modes = intel_dp_get_modes,
1319         .mode_valid = intel_dp_mode_valid,
1320         .best_encoder = intel_best_encoder,
1321 };
1322
1323 static void intel_dp_enc_destroy(struct drm_encoder *encoder)
1324 {
1325         drm_encoder_cleanup(encoder);
1326 }
1327
1328 static const struct drm_encoder_funcs intel_dp_enc_funcs = {
1329         .destroy = intel_dp_enc_destroy,
1330 };
1331
1332 void
1333 intel_dp_hot_plug(struct intel_encoder *intel_encoder)
1334 {
1335         struct intel_dp_priv *dp_priv = intel_encoder->dev_priv;
1336
1337         if (dp_priv->dpms_mode == DRM_MODE_DPMS_ON)
1338                 intel_dp_check_link_status(intel_encoder);
1339 }
1340
1341 void
1342 intel_dp_init(struct drm_device *dev, int output_reg)
1343 {
1344         struct drm_i915_private *dev_priv = dev->dev_private;
1345         struct drm_connector *connector;
1346         struct intel_encoder *intel_encoder;
1347         struct intel_dp_priv *dp_priv;
1348         const char *name = NULL;
1349
1350         intel_encoder = kcalloc(sizeof(struct intel_encoder) +
1351                                sizeof(struct intel_dp_priv), 1, GFP_KERNEL);
1352         if (!intel_encoder)
1353                 return;
1354
1355         dp_priv = (struct intel_dp_priv *)(intel_encoder + 1);
1356
1357         connector = &intel_encoder->base;
1358         drm_connector_init(dev, connector, &intel_dp_connector_funcs,
1359                            DRM_MODE_CONNECTOR_DisplayPort);
1360         drm_connector_helper_add(connector, &intel_dp_connector_helper_funcs);
1361
1362         if (output_reg == DP_A)
1363                 intel_encoder->type = INTEL_OUTPUT_EDP;
1364         else
1365                 intel_encoder->type = INTEL_OUTPUT_DISPLAYPORT;
1366
1367         if (output_reg == DP_B || output_reg == PCH_DP_B)
1368                 intel_encoder->clone_mask = (1 << INTEL_DP_B_CLONE_BIT);
1369         else if (output_reg == DP_C || output_reg == PCH_DP_C)
1370                 intel_encoder->clone_mask = (1 << INTEL_DP_C_CLONE_BIT);
1371         else if (output_reg == DP_D || output_reg == PCH_DP_D)
1372                 intel_encoder->clone_mask = (1 << INTEL_DP_D_CLONE_BIT);
1373
1374         if (IS_eDP(intel_encoder))
1375                 intel_encoder->clone_mask = (1 << INTEL_EDP_CLONE_BIT);
1376
1377         intel_encoder->crtc_mask = (1 << 0) | (1 << 1);
1378         connector->interlace_allowed = true;
1379         connector->doublescan_allowed = 0;
1380
1381         dp_priv->intel_encoder = intel_encoder;
1382         dp_priv->output_reg = output_reg;
1383         dp_priv->has_audio = false;
1384         dp_priv->dpms_mode = DRM_MODE_DPMS_ON;
1385         intel_encoder->dev_priv = dp_priv;
1386
1387         drm_encoder_init(dev, &intel_encoder->enc, &intel_dp_enc_funcs,
1388                          DRM_MODE_ENCODER_TMDS);
1389         drm_encoder_helper_add(&intel_encoder->enc, &intel_dp_helper_funcs);
1390
1391         drm_mode_connector_attach_encoder(&intel_encoder->base,
1392                                           &intel_encoder->enc);
1393         drm_sysfs_connector_add(connector);
1394
1395         /* Set up the DDC bus. */
1396         switch (output_reg) {
1397                 case DP_A:
1398                         name = "DPDDC-A";
1399                         break;
1400                 case DP_B:
1401                 case PCH_DP_B:
1402                         dev_priv->hotplug_supported_mask |=
1403                                 HDMIB_HOTPLUG_INT_STATUS;
1404                         name = "DPDDC-B";
1405                         break;
1406                 case DP_C:
1407                 case PCH_DP_C:
1408                         dev_priv->hotplug_supported_mask |=
1409                                 HDMIC_HOTPLUG_INT_STATUS;
1410                         name = "DPDDC-C";
1411                         break;
1412                 case DP_D:
1413                 case PCH_DP_D:
1414                         dev_priv->hotplug_supported_mask |=
1415                                 HDMID_HOTPLUG_INT_STATUS;
1416                         name = "DPDDC-D";
1417                         break;
1418         }
1419
1420         intel_dp_i2c_init(intel_encoder, name);
1421
1422         intel_encoder->ddc_bus = &dp_priv->adapter;
1423         intel_encoder->hot_plug = intel_dp_hot_plug;
1424
1425         if (output_reg == DP_A) {
1426                 /* initialize panel mode from VBT if available for eDP */
1427                 if (dev_priv->lfp_lvds_vbt_mode) {
1428                         dev_priv->panel_fixed_mode =
1429                                 drm_mode_duplicate(dev, dev_priv->lfp_lvds_vbt_mode);
1430                         if (dev_priv->panel_fixed_mode) {
1431                                 dev_priv->panel_fixed_mode->type |=
1432                                         DRM_MODE_TYPE_PREFERRED;
1433                         }
1434                 }
1435         }
1436
1437         /* For G4X desktop chip, PEG_BAND_GAP_DATA 3:0 must first be written
1438          * 0xd.  Failure to do so will result in spurious interrupts being
1439          * generated on the port when a cable is not attached.
1440          */
1441         if (IS_G4X(dev) && !IS_GM45(dev)) {
1442                 u32 temp = I915_READ(PEG_BAND_GAP_DATA);
1443                 I915_WRITE(PEG_BAND_GAP_DATA, (temp & ~0xf) | 0xd);
1444         }
1445 }