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

   1 /* SPDX-License-Identifier: MIT */
   2 /*
   3  * Copyright (C) 2020 Google, Inc.
   4  *
   5  * Authors:
   6  * Sean Paul <seanpaul@chromium.org>
   7  */
   8
   9 #include <drm/display/drm_dp_helper.h>
  10 #include <drm/display/drm_dp_mst_helper.h>
  11 #include <drm/display/drm_hdcp_helper.h>
  12 #include <drm/drm_print.h>
  13
  14 #include "i915_reg.h"
  15 #include "intel_ddi.h"
  16 #include "intel_de.h"
  17 #include "intel_display_types.h"
  18 #include "intel_dp.h"
  19 #include "intel_dp_hdcp.h"
  20 #include "intel_hdcp.h"
  21 #include "intel_hdcp_regs.h"
  22
  23 static u32 transcoder_to_stream_enc_status(enum transcoder cpu_transcoder)
  24 {
  25         switch (cpu_transcoder) {
  26         case TRANSCODER_A:
  27                 return HDCP_STATUS_STREAM_A_ENC;
  28         case TRANSCODER_B:
  29                 return HDCP_STATUS_STREAM_B_ENC;
  30         case TRANSCODER_C:
  31                 return HDCP_STATUS_STREAM_C_ENC;
  32         case TRANSCODER_D:
  33                 return HDCP_STATUS_STREAM_D_ENC;
  34         default:
  35                 return 0;
  36         }
  37 }
  38
  39 static void intel_dp_hdcp_wait_for_cp_irq(struct intel_hdcp *hdcp, int timeout)
  40 {
  41         long ret;
  42
  43 #define C (hdcp->cp_irq_count_cached != atomic_read(&hdcp->cp_irq_count))
  44         ret = wait_event_interruptible_timeout(hdcp->cp_irq_queue, C,
  45                                                msecs_to_jiffies(timeout));
  46
  47         if (!ret)
  48                 DRM_DEBUG_KMS("Timedout at waiting for CP_IRQ\n");
  49 }
  50
  51 static
  52 int intel_dp_hdcp_write_an_aksv(struct intel_digital_port *dig_port,
  53                                 u8 *an)
  54 {
  55         struct drm_i915_private *i915 = to_i915(dig_port->base.base.dev);
  56         u8 aksv[DRM_HDCP_KSV_LEN] = {};
  57         ssize_t dpcd_ret;
  58
  59         /* Output An first, that's easy */
  60         dpcd_ret = drm_dp_dpcd_write(&dig_port->dp.aux, DP_AUX_HDCP_AN,
  61                                      an, DRM_HDCP_AN_LEN);
  62         if (dpcd_ret != DRM_HDCP_AN_LEN) {
  63                 drm_dbg_kms(&i915->drm,
  64                             "Failed to write An over DP/AUX (%zd)\n",
  65                             dpcd_ret);
  66                 return dpcd_ret >= 0 ? -EIO : dpcd_ret;
  67         }
  68
  69         /*
  70          * Since Aksv is Oh-So-Secret, we can't access it in software. So we
  71          * send an empty buffer of the correct length through the DP helpers. On
  72          * the other side, in the transfer hook, we'll generate a flag based on
  73          * the destination address which will tickle the hardware to output the
  74          * Aksv on our behalf after the header is sent.
  75          */
  76         dpcd_ret = drm_dp_dpcd_write(&dig_port->dp.aux, DP_AUX_HDCP_AKSV,
  77                                      aksv, DRM_HDCP_KSV_LEN);
  78         if (dpcd_ret != DRM_HDCP_KSV_LEN) {
  79                 drm_dbg_kms(&i915->drm,
  80                             "Failed to write Aksv over DP/AUX (%zd)\n",
  81                             dpcd_ret);
  82                 return dpcd_ret >= 0 ? -EIO : dpcd_ret;
  83         }
  84         return 0;
  85 }
  86
  87 static int intel_dp_hdcp_read_bksv(struct intel_digital_port *dig_port,
  88                                    u8 *bksv)
  89 {
  90         struct drm_i915_private *i915 = to_i915(dig_port->base.base.dev);
  91         ssize_t ret;
  92
  93         ret = drm_dp_dpcd_read(&dig_port->dp.aux, DP_AUX_HDCP_BKSV, bksv,
  94                                DRM_HDCP_KSV_LEN);
  95         if (ret != DRM_HDCP_KSV_LEN) {
  96                 drm_dbg_kms(&i915->drm,
  97                             "Read Bksv from DP/AUX failed (%zd)\n", ret);
  98                 return ret >= 0 ? -EIO : ret;
  99         }
 100         return 0;
 101 }
 102
 103 static int intel_dp_hdcp_read_bstatus(struct intel_digital_port *dig_port,
 104                                       u8 *bstatus)
 105 {
 106         struct drm_i915_private *i915 = to_i915(dig_port->base.base.dev);
 107         ssize_t ret;
 108
 109         /*
 110          * For some reason the HDMI and DP HDCP specs call this register
 111          * definition by different names. In the HDMI spec, it's called BSTATUS,
 112          * but in DP it's called BINFO.
 113          */
 114         ret = drm_dp_dpcd_read(&dig_port->dp.aux, DP_AUX_HDCP_BINFO,
 115                                bstatus, DRM_HDCP_BSTATUS_LEN);
 116         if (ret != DRM_HDCP_BSTATUS_LEN) {
 117                 drm_dbg_kms(&i915->drm,
 118                             "Read bstatus from DP/AUX failed (%zd)\n", ret);
 119                 return ret >= 0 ? -EIO : ret;
 120         }
 121         return 0;
 122 }
 123
 124 static
 125 int intel_dp_hdcp_read_bcaps(struct intel_digital_port *dig_port,
 126                              u8 *bcaps)
 127 {
 128         struct drm_i915_private *i915 = to_i915(dig_port->base.base.dev);
 129         ssize_t ret;
 130
 131         ret = drm_dp_dpcd_read(&dig_port->dp.aux, DP_AUX_HDCP_BCAPS,
 132                                bcaps, 1);
 133         if (ret != 1) {
 134                 drm_dbg_kms(&i915->drm,
 135                             "Read bcaps from DP/AUX failed (%zd)\n", ret);
 136                 return ret >= 0 ? -EIO : ret;
 137         }
 138
 139         return 0;
 140 }
 141
 142 static
 143 int intel_dp_hdcp_repeater_present(struct intel_digital_port *dig_port,
 144                                    bool *repeater_present)
 145 {
 146         ssize_t ret;
 147         u8 bcaps;
 148
 149         ret = intel_dp_hdcp_read_bcaps(dig_port, &bcaps);
 150         if (ret)
 151                 return ret;
 152
 153         *repeater_present = bcaps & DP_BCAPS_REPEATER_PRESENT;
 154         return 0;
 155 }
 156
 157 static
 158 int intel_dp_hdcp_read_ri_prime(struct intel_digital_port *dig_port,
 159                                 u8 *ri_prime)
 160 {
 161         struct drm_i915_private *i915 = to_i915(dig_port->base.base.dev);
 162         ssize_t ret;
 163
 164         ret = drm_dp_dpcd_read(&dig_port->dp.aux, DP_AUX_HDCP_RI_PRIME,
 165                                ri_prime, DRM_HDCP_RI_LEN);
 166         if (ret != DRM_HDCP_RI_LEN) {
 167                 drm_dbg_kms(&i915->drm, "Read Ri' from DP/AUX failed (%zd)\n",
 168                             ret);
 169                 return ret >= 0 ? -EIO : ret;
 170         }
 171         return 0;
 172 }
 173
 174 static
 175 int intel_dp_hdcp_read_ksv_ready(struct intel_digital_port *dig_port,
 176                                  bool *ksv_ready)
 177 {
 178         struct drm_i915_private *i915 = to_i915(dig_port->base.base.dev);
 179         ssize_t ret;
 180         u8 bstatus;
 181
 182         ret = drm_dp_dpcd_read(&dig_port->dp.aux, DP_AUX_HDCP_BSTATUS,
 183                                &bstatus, 1);
 184         if (ret != 1) {
 185                 drm_dbg_kms(&i915->drm,
 186                             "Read bstatus from DP/AUX failed (%zd)\n", ret);
 187                 return ret >= 0 ? -EIO : ret;
 188         }
 189         *ksv_ready = bstatus & DP_BSTATUS_READY;
 190         return 0;
 191 }
 192
 193 static
 194 int intel_dp_hdcp_read_ksv_fifo(struct intel_digital_port *dig_port,
 195                                 int num_downstream, u8 *ksv_fifo)
 196 {
 197         struct drm_i915_private *i915 = to_i915(dig_port->base.base.dev);
 198         ssize_t ret;
 199         int i;
 200
 201         /* KSV list is read via 15 byte window (3 entries @ 5 bytes each) */
 202         for (i = 0; i < num_downstream; i += 3) {
 203                 size_t len = min(num_downstream - i, 3) * DRM_HDCP_KSV_LEN;
 204                 ret = drm_dp_dpcd_read(&dig_port->dp.aux,
 205                                        DP_AUX_HDCP_KSV_FIFO,
 206                                        ksv_fifo + i * DRM_HDCP_KSV_LEN,
 207                                        len);
 208                 if (ret != len) {
 209                         drm_dbg_kms(&i915->drm,
 210                                     "Read ksv[%d] from DP/AUX failed (%zd)\n",
 211                                     i, ret);
 212                         return ret >= 0 ? -EIO : ret;
 213                 }
 214         }
 215         return 0;
 216 }
 217
 218 static
 219 int intel_dp_hdcp_read_v_prime_part(struct intel_digital_port *dig_port,
 220                                     int i, u32 *part)
 221 {
 222         struct drm_i915_private *i915 = to_i915(dig_port->base.base.dev);
 223         ssize_t ret;
 224
 225         if (i >= DRM_HDCP_V_PRIME_NUM_PARTS)
 226                 return -EINVAL;
 227
 228         ret = drm_dp_dpcd_read(&dig_port->dp.aux,
 229                                DP_AUX_HDCP_V_PRIME(i), part,
 230                                DRM_HDCP_V_PRIME_PART_LEN);
 231         if (ret != DRM_HDCP_V_PRIME_PART_LEN) {
 232                 drm_dbg_kms(&i915->drm,
 233                             "Read v'[%d] from DP/AUX failed (%zd)\n", i, ret);
 234                 return ret >= 0 ? -EIO : ret;
 235         }
 236         return 0;
 237 }
 238
 239 static
 240 int intel_dp_hdcp_toggle_signalling(struct intel_digital_port *dig_port,
 241                                     enum transcoder cpu_transcoder,
 242                                     bool enable)
 243 {
 244         /* Not used for single stream DisplayPort setups */
 245         return 0;
 246 }
 247
 248 static
 249 bool intel_dp_hdcp_check_link(struct intel_digital_port *dig_port,
 250                               struct intel_connector *connector)
 251 {
 252         struct drm_i915_private *i915 = to_i915(dig_port->base.base.dev);
 253         ssize_t ret;
 254         u8 bstatus;
 255
 256         ret = drm_dp_dpcd_read(&dig_port->dp.aux, DP_AUX_HDCP_BSTATUS,
 257                                &bstatus, 1);
 258         if (ret != 1) {
 259                 drm_dbg_kms(&i915->drm,
 260                             "Read bstatus from DP/AUX failed (%zd)\n", ret);
 261                 return false;
 262         }
 263
 264         return !(bstatus & (DP_BSTATUS_LINK_FAILURE | DP_BSTATUS_REAUTH_REQ));
 265 }
 266
 267 static
 268 int intel_dp_hdcp_capable(struct intel_digital_port *dig_port,
 269                           bool *hdcp_capable)
 270 {
 271         ssize_t ret;
 272         u8 bcaps;
 273
 274         ret = intel_dp_hdcp_read_bcaps(dig_port, &bcaps);
 275         if (ret)
 276                 return ret;
 277
 278         *hdcp_capable = bcaps & DP_BCAPS_HDCP_CAPABLE;
 279         return 0;
 280 }
 281
 282 struct hdcp2_dp_errata_stream_type {
 283         u8      msg_id;
 284         u8      stream_type;
 285 } __packed;
 286
 287 struct hdcp2_dp_msg_data {
 288         u8 msg_id;
 289         u32 offset;
 290         bool msg_detectable;
 291         u32 timeout;
 292         u32 timeout2; /* Added for non_paired situation */
 293         /* Timeout to read entire msg */
 294         u32 msg_read_timeout;
 295 };
 296
 297 static const struct hdcp2_dp_msg_data hdcp2_dp_msg_data[] = {
 298         { HDCP_2_2_AKE_INIT, DP_HDCP_2_2_AKE_INIT_OFFSET, false, 0, 0, 0},
 299         { HDCP_2_2_AKE_SEND_CERT, DP_HDCP_2_2_AKE_SEND_CERT_OFFSET,
 300           false, HDCP_2_2_CERT_TIMEOUT_MS, 0, HDCP_2_2_DP_CERT_READ_TIMEOUT_MS},
 301         { HDCP_2_2_AKE_NO_STORED_KM, DP_HDCP_2_2_AKE_NO_STORED_KM_OFFSET,
 302           false, 0, 0, 0 },
 303         { HDCP_2_2_AKE_STORED_KM, DP_HDCP_2_2_AKE_STORED_KM_OFFSET,
 304           false, 0, 0, 0 },
 305         { HDCP_2_2_AKE_SEND_HPRIME, DP_HDCP_2_2_AKE_SEND_HPRIME_OFFSET,
 306           true, HDCP_2_2_HPRIME_PAIRED_TIMEOUT_MS,
 307           HDCP_2_2_HPRIME_NO_PAIRED_TIMEOUT_MS, HDCP_2_2_DP_HPRIME_READ_TIMEOUT_MS},
 308         { HDCP_2_2_AKE_SEND_PAIRING_INFO,
 309           DP_HDCP_2_2_AKE_SEND_PAIRING_INFO_OFFSET, true,
 310           HDCP_2_2_PAIRING_TIMEOUT_MS, 0, HDCP_2_2_DP_PAIRING_READ_TIMEOUT_MS },
 311         { HDCP_2_2_LC_INIT, DP_HDCP_2_2_LC_INIT_OFFSET, false, 0, 0, 0 },
 312         { HDCP_2_2_LC_SEND_LPRIME, DP_HDCP_2_2_LC_SEND_LPRIME_OFFSET,
 313           false, HDCP_2_2_DP_LPRIME_TIMEOUT_MS, 0, 0 },
 314         { HDCP_2_2_SKE_SEND_EKS, DP_HDCP_2_2_SKE_SEND_EKS_OFFSET, false,
 315           0, 0, 0 },
 316         { HDCP_2_2_REP_SEND_RECVID_LIST,
 317           DP_HDCP_2_2_REP_SEND_RECVID_LIST_OFFSET, true,
 318           HDCP_2_2_RECVID_LIST_TIMEOUT_MS, 0, 0 },
 319         { HDCP_2_2_REP_SEND_ACK, DP_HDCP_2_2_REP_SEND_ACK_OFFSET, false,
 320           0, 0, 0 },
 321         { HDCP_2_2_REP_STREAM_MANAGE,
 322           DP_HDCP_2_2_REP_STREAM_MANAGE_OFFSET, false,
 323           0, 0, 0},
 324         { HDCP_2_2_REP_STREAM_READY, DP_HDCP_2_2_REP_STREAM_READY_OFFSET,
 325           false, HDCP_2_2_STREAM_READY_TIMEOUT_MS, 0, 0 },
 326 /* local define to shovel this through the write_2_2 interface */
 327 #define HDCP_2_2_ERRATA_DP_STREAM_TYPE  50
 328         { HDCP_2_2_ERRATA_DP_STREAM_TYPE,
 329           DP_HDCP_2_2_REG_STREAM_TYPE_OFFSET, false,
 330           0, 0 },
 331 };
 332
 333 static struct drm_dp_aux *
 334 intel_dp_hdcp_get_aux(struct intel_connector *connector)
 335 {
 336         struct intel_digital_port *dig_port = intel_attached_dig_port(connector);
 337
 338         if (intel_encoder_is_mst(connector->encoder))
 339                 return &connector->port->aux;
 340         else
 341                 return &dig_port->dp.aux;
 342 }
 343
 344 static int
 345 intel_dp_hdcp2_read_rx_status(struct intel_connector *connector,
 346                               u8 *rx_status)
 347 {
 348         struct drm_i915_private *i915 = to_i915(connector->base.dev);
 349         struct drm_dp_aux *aux = intel_dp_hdcp_get_aux(connector);
 350         ssize_t ret;
 351
 352         ret = drm_dp_dpcd_read(aux,
 353                                DP_HDCP_2_2_REG_RXSTATUS_OFFSET, rx_status,
 354                                HDCP_2_2_DP_RXSTATUS_LEN);
 355         if (ret != HDCP_2_2_DP_RXSTATUS_LEN) {
 356                 drm_dbg_kms(&i915->drm,
 357                             "Read bstatus from DP/AUX failed (%zd)\n", ret);
 358                 return ret >= 0 ? -EIO : ret;
 359         }
 360
 361         return 0;
 362 }
 363
 364 static
 365 int hdcp2_detect_msg_availability(struct intel_connector *connector,
 366                                   u8 msg_id, bool *msg_ready)
 367 {
 368         u8 rx_status;
 369         int ret;
 370
 371         *msg_ready = false;
 372         ret = intel_dp_hdcp2_read_rx_status(connector, &rx_status);
 373         if (ret < 0)
 374                 return ret;
 375
 376         switch (msg_id) {
 377         case HDCP_2_2_AKE_SEND_HPRIME:
 378                 if (HDCP_2_2_DP_RXSTATUS_H_PRIME(rx_status))
 379                         *msg_ready = true;
 380                 break;
 381         case HDCP_2_2_AKE_SEND_PAIRING_INFO:
 382                 if (HDCP_2_2_DP_RXSTATUS_PAIRING(rx_status))
 383                         *msg_ready = true;
 384                 break;
 385         case HDCP_2_2_REP_SEND_RECVID_LIST:
 386                 if (HDCP_2_2_DP_RXSTATUS_READY(rx_status))
 387                         *msg_ready = true;
 388                 break;
 389         default:
 390                 DRM_ERROR("Unidentified msg_id: %d\n", msg_id);
 391                 return -EINVAL;
 392         }
 393
 394         return 0;
 395 }
 396
 397 static ssize_t
 398 intel_dp_hdcp2_wait_for_msg(struct intel_connector *connector,
 399                             const struct hdcp2_dp_msg_data *hdcp2_msg_data)
 400 {
 401         struct drm_i915_private *i915 = to_i915(connector->base.dev);
 402         struct intel_hdcp *hdcp = &connector->hdcp;
 403         u8 msg_id = hdcp2_msg_data->msg_id;
 404         int ret, timeout;
 405         bool msg_ready = false;
 406
 407         if (msg_id == HDCP_2_2_AKE_SEND_HPRIME && !hdcp->is_paired)
 408                 timeout = hdcp2_msg_data->timeout2;
 409         else
 410                 timeout = hdcp2_msg_data->timeout;
 411
 412         /*
 413          * There is no way to detect the CERT, LPRIME and STREAM_READY
 414          * availability. So Wait for timeout and read the msg.
 415          */
 416         if (!hdcp2_msg_data->msg_detectable) {
 417                 mdelay(timeout);
 418                 ret = 0;
 419         } else {
 420                 /*
 421                  * As we want to check the msg availability at timeout, Ignoring
 422                  * the timeout at wait for CP_IRQ.
 423                  */
 424                 intel_dp_hdcp_wait_for_cp_irq(hdcp, timeout);
 425                 ret = hdcp2_detect_msg_availability(connector, msg_id,
 426                                                     &msg_ready);
 427                 if (!msg_ready)
 428                         ret = -ETIMEDOUT;
 429         }
 430
 431         if (ret)
 432                 drm_dbg_kms(&i915->drm,
 433                             "msg_id %d, ret %d, timeout(mSec): %d\n",
 434                             hdcp2_msg_data->msg_id, ret, timeout);
 435
 436         return ret;
 437 }
 438
 439 static const struct hdcp2_dp_msg_data *get_hdcp2_dp_msg_data(u8 msg_id)
 440 {
 441         int i;
 442
 443         for (i = 0; i < ARRAY_SIZE(hdcp2_dp_msg_data); i++)
 444                 if (hdcp2_dp_msg_data[i].msg_id == msg_id)
 445                         return &hdcp2_dp_msg_data[i];
 446
 447         return NULL;
 448 }
 449
 450 static
 451 int intel_dp_hdcp2_write_msg(struct intel_connector *connector,
 452                              void *buf, size_t size)
 453 {
 454         unsigned int offset;
 455         u8 *byte = buf;
 456         ssize_t ret, bytes_to_write, len;
 457         const struct hdcp2_dp_msg_data *hdcp2_msg_data;
 458         struct drm_dp_aux *aux;
 459
 460         hdcp2_msg_data = get_hdcp2_dp_msg_data(*byte);
 461         if (!hdcp2_msg_data)
 462                 return -EINVAL;
 463
 464         offset = hdcp2_msg_data->offset;
 465
 466         aux = intel_dp_hdcp_get_aux(connector);
 467
 468         /* No msg_id in DP HDCP2.2 msgs */
 469         bytes_to_write = size - 1;
 470         byte++;
 471
 472         while (bytes_to_write) {
 473                 len = bytes_to_write > DP_AUX_MAX_PAYLOAD_BYTES ?
 474                                 DP_AUX_MAX_PAYLOAD_BYTES : bytes_to_write;
 475
 476                 ret = drm_dp_dpcd_write(aux,
 477                                         offset, (void *)byte, len);
 478                 if (ret < 0)
 479                         return ret;
 480
 481                 bytes_to_write -= ret;
 482                 byte += ret;
 483                 offset += ret;
 484         }
 485
 486         return size;
 487 }
 488
 489 static
 490 ssize_t get_receiver_id_list_rx_info(struct intel_connector *connector,
 491                                      u32 *dev_cnt, u8 *byte)
 492 {
 493         struct drm_dp_aux *aux = intel_dp_hdcp_get_aux(connector);
 494         ssize_t ret;
 495         u8 *rx_info = byte;
 496
 497         ret = drm_dp_dpcd_read(aux,
 498                                DP_HDCP_2_2_REG_RXINFO_OFFSET,
 499                                (void *)rx_info, HDCP_2_2_RXINFO_LEN);
 500         if (ret != HDCP_2_2_RXINFO_LEN)
 501                 return ret >= 0 ? -EIO : ret;
 502
 503         *dev_cnt = (HDCP_2_2_DEV_COUNT_HI(rx_info[0]) << 4 |
 504                    HDCP_2_2_DEV_COUNT_LO(rx_info[1]));
 505
 506         if (*dev_cnt > HDCP_2_2_MAX_DEVICE_COUNT)
 507                 *dev_cnt = HDCP_2_2_MAX_DEVICE_COUNT;
 508
 509         return ret;
 510 }
 511
 512 static
 513 int intel_dp_hdcp2_read_msg(struct intel_connector *connector,
 514                             u8 msg_id, void *buf, size_t size)
 515 {
 516         struct intel_digital_port *dig_port = intel_attached_dig_port(connector);
 517         struct drm_i915_private *i915 = to_i915(dig_port->base.base.dev);
 518         struct intel_hdcp *hdcp = &connector->hdcp;
 519         struct drm_dp_aux *aux;
 520         unsigned int offset;
 521         u8 *byte = buf;
 522         ssize_t ret, bytes_to_recv, len;
 523         const struct hdcp2_dp_msg_data *hdcp2_msg_data;
 524         ktime_t msg_end = ktime_set(0, 0);
 525         bool msg_expired;
 526         u32 dev_cnt;
 527
 528         hdcp2_msg_data = get_hdcp2_dp_msg_data(msg_id);
 529         if (!hdcp2_msg_data)
 530                 return -EINVAL;
 531         offset = hdcp2_msg_data->offset;
 532
 533         aux = intel_dp_hdcp_get_aux(connector);
 534
 535         ret = intel_dp_hdcp2_wait_for_msg(connector, hdcp2_msg_data);
 536         if (ret < 0)
 537                 return ret;
 538
 539         hdcp->cp_irq_count_cached = atomic_read(&hdcp->cp_irq_count);
 540
 541         /* DP adaptation msgs has no msg_id */
 542         byte++;
 543
 544         if (msg_id == HDCP_2_2_REP_SEND_RECVID_LIST) {
 545                 ret = get_receiver_id_list_rx_info(connector, &dev_cnt, byte);
 546                 if (ret < 0)
 547                         return ret;
 548
 549                 byte += ret;
 550                 size = sizeof(struct hdcp2_rep_send_receiverid_list) -
 551                 HDCP_2_2_RXINFO_LEN - HDCP_2_2_RECEIVER_IDS_MAX_LEN +
 552                 (dev_cnt * HDCP_2_2_RECEIVER_ID_LEN);
 553                 offset += HDCP_2_2_RXINFO_LEN;
 554         }
 555
 556         bytes_to_recv = size - 1;
 557
 558         while (bytes_to_recv) {
 559                 len = bytes_to_recv > DP_AUX_MAX_PAYLOAD_BYTES ?
 560                       DP_AUX_MAX_PAYLOAD_BYTES : bytes_to_recv;
 561
 562                 /* Entire msg read timeout since initiate of msg read */
 563                 if (bytes_to_recv == size - 1 && hdcp2_msg_data->msg_read_timeout > 0) {
 564                         if (intel_encoder_is_mst(connector->encoder))
 565                                 msg_end = ktime_add_ms(ktime_get_raw(),
 566                                                        hdcp2_msg_data->msg_read_timeout *
 567                                                        connector->port->parent->num_ports);
 568                         else
 569                                 msg_end = ktime_add_ms(ktime_get_raw(),
 570                                                        hdcp2_msg_data->msg_read_timeout);
 571                 }
 572
 573                 ret = drm_dp_dpcd_read(aux, offset,
 574                                        (void *)byte, len);
 575                 if (ret < 0) {
 576                         drm_dbg_kms(&i915->drm, "msg_id %d, ret %zd\n",
 577                                     msg_id, ret);
 578                         return ret;
 579                 }
 580
 581                 bytes_to_recv -= ret;
 582                 byte += ret;
 583                 offset += ret;
 584         }
 585
 586         if (hdcp2_msg_data->msg_read_timeout > 0) {
 587                 msg_expired = ktime_after(ktime_get_raw(), msg_end);
 588                 if (msg_expired) {
 589                         drm_dbg_kms(&i915->drm, "msg_id %d, entire msg read timeout(mSec): %d\n",
 590                                     msg_id, hdcp2_msg_data->msg_read_timeout);
 591                         return -ETIMEDOUT;
 592                 }
 593         }
 594
 595         byte = buf;
 596         *byte = msg_id;
 597
 598         return size;
 599 }
 600
 601 static
 602 int intel_dp_hdcp2_config_stream_type(struct intel_connector *connector,
 603                                       bool is_repeater, u8 content_type)
 604 {
 605         int ret;
 606         struct hdcp2_dp_errata_stream_type stream_type_msg;
 607
 608         if (is_repeater)
 609                 return 0;
 610
 611         /*
 612          * Errata for DP: As Stream type is used for encryption, Receiver
 613          * should be communicated with stream type for the decryption of the
 614          * content.
 615          * Repeater will be communicated with stream type as a part of it's
 616          * auth later in time.
 617          */
 618         stream_type_msg.msg_id = HDCP_2_2_ERRATA_DP_STREAM_TYPE;
 619         stream_type_msg.stream_type = content_type;
 620
 621         ret =  intel_dp_hdcp2_write_msg(connector, &stream_type_msg,
 622                                         sizeof(stream_type_msg));
 623
 624         return ret < 0 ? ret : 0;
 625
 626 }
 627
 628 static
 629 int intel_dp_hdcp2_check_link(struct intel_digital_port *dig_port,
 630                               struct intel_connector *connector)
 631 {
 632         u8 rx_status;
 633         int ret;
 634
 635         ret = intel_dp_hdcp2_read_rx_status(connector,
 636                                             &rx_status);
 637         if (ret)
 638                 return ret;
 639
 640         if (HDCP_2_2_DP_RXSTATUS_REAUTH_REQ(rx_status))
 641                 ret = HDCP_REAUTH_REQUEST;
 642         else if (HDCP_2_2_DP_RXSTATUS_LINK_FAILED(rx_status))
 643                 ret = HDCP_LINK_INTEGRITY_FAILURE;
 644         else if (HDCP_2_2_DP_RXSTATUS_READY(rx_status))
 645                 ret = HDCP_TOPOLOGY_CHANGE;
 646
 647         return ret;
 648 }
 649
 650 static
 651 int intel_dp_hdcp2_capable(struct intel_connector *connector,
 652                            bool *capable)
 653 {
 654         struct drm_dp_aux *aux;
 655         u8 rx_caps[3];
 656         int ret;
 657
 658         aux = intel_dp_hdcp_get_aux(connector);
 659
 660         *capable = false;
 661         ret = drm_dp_dpcd_read(aux,
 662                                DP_HDCP_2_2_REG_RX_CAPS_OFFSET,
 663                                rx_caps, HDCP_2_2_RXCAPS_LEN);
 664         if (ret != HDCP_2_2_RXCAPS_LEN)
 665                 return ret >= 0 ? -EIO : ret;
 666
 667         if (rx_caps[0] == HDCP_2_2_RX_CAPS_VERSION_VAL &&
 668             HDCP_2_2_DP_HDCP_CAPABLE(rx_caps[2]))
 669                 *capable = true;
 670
 671         return 0;
 672 }
 673
 674 static const struct intel_hdcp_shim intel_dp_hdcp_shim = {
 675         .write_an_aksv = intel_dp_hdcp_write_an_aksv,
 676         .read_bksv = intel_dp_hdcp_read_bksv,
 677         .read_bstatus = intel_dp_hdcp_read_bstatus,
 678         .repeater_present = intel_dp_hdcp_repeater_present,
 679         .read_ri_prime = intel_dp_hdcp_read_ri_prime,
 680         .read_ksv_ready = intel_dp_hdcp_read_ksv_ready,
 681         .read_ksv_fifo = intel_dp_hdcp_read_ksv_fifo,
 682         .read_v_prime_part = intel_dp_hdcp_read_v_prime_part,
 683         .toggle_signalling = intel_dp_hdcp_toggle_signalling,
 684         .check_link = intel_dp_hdcp_check_link,
 685         .hdcp_capable = intel_dp_hdcp_capable,
 686         .write_2_2_msg = intel_dp_hdcp2_write_msg,
 687         .read_2_2_msg = intel_dp_hdcp2_read_msg,
 688         .config_stream_type = intel_dp_hdcp2_config_stream_type,
 689         .check_2_2_link = intel_dp_hdcp2_check_link,
 690         .hdcp_2_2_capable = intel_dp_hdcp2_capable,
 691         .protocol = HDCP_PROTOCOL_DP,
 692 };
 693
 694 static int
 695 intel_dp_mst_toggle_hdcp_stream_select(struct intel_connector *connector,
 696                                        bool enable)
 697 {
 698         struct intel_digital_port *dig_port = intel_attached_dig_port(connector);
 699         struct drm_i915_private *i915 = to_i915(connector->base.dev);
 700         struct intel_hdcp *hdcp = &connector->hdcp;
 701         int ret;
 702
 703         ret = intel_ddi_toggle_hdcp_bits(&dig_port->base,
 704                                          hdcp->stream_transcoder, enable,
 705                                          TRANS_DDI_HDCP_SELECT);
 706         if (ret)
 707                 drm_err(&i915->drm, "%s HDCP stream select failed (%d)\n",
 708                         enable ? "Enable" : "Disable", ret);
 709         return ret;
 710 }
 711
 712 static int
 713 intel_dp_mst_hdcp_stream_encryption(struct intel_connector *connector,
 714                                     bool enable)
 715 {
 716         struct intel_digital_port *dig_port = intel_attached_dig_port(connector);
 717         struct drm_i915_private *i915 = to_i915(connector->base.dev);
 718         struct intel_hdcp *hdcp = &connector->hdcp;
 719         enum port port = dig_port->base.port;
 720         enum transcoder cpu_transcoder = hdcp->stream_transcoder;
 721         u32 stream_enc_status;
 722         int ret;
 723
 724         ret = intel_dp_mst_toggle_hdcp_stream_select(connector, enable);
 725         if (ret)
 726                 return ret;
 727
 728         stream_enc_status =  transcoder_to_stream_enc_status(cpu_transcoder);
 729         if (!stream_enc_status)
 730                 return -EINVAL;
 731
 732         /* Wait for encryption confirmation */
 733         if (intel_de_wait_for_register(i915,
 734                                        HDCP_STATUS(i915, cpu_transcoder, port),
 735                                        stream_enc_status,
 736                                        enable ? stream_enc_status : 0,
 737                                        HDCP_ENCRYPT_STATUS_CHANGE_TIMEOUT_MS)) {
 738                 drm_err(&i915->drm, "Timed out waiting for transcoder: %s stream encryption %s\n",
 739                         transcoder_name(cpu_transcoder), enable ? "enabled" : "disabled");
 740                 return -ETIMEDOUT;
 741         }
 742
 743         return 0;
 744 }
 745
 746 static int
 747 intel_dp_mst_hdcp2_stream_encryption(struct intel_connector *connector,
 748                                      bool enable)
 749 {
 750         struct intel_digital_port *dig_port = intel_attached_dig_port(connector);
 751         struct drm_i915_private *i915 = to_i915(connector->base.dev);
 752         struct hdcp_port_data *data = &dig_port->hdcp_port_data;
 753         struct intel_hdcp *hdcp = &connector->hdcp;
 754         enum transcoder cpu_transcoder = hdcp->stream_transcoder;
 755         enum pipe pipe = (enum pipe)cpu_transcoder;
 756         enum port port = dig_port->base.port;
 757         int ret;
 758
 759         drm_WARN_ON(&i915->drm, enable &&
 760                     !!(intel_de_read(i915, HDCP2_AUTH_STREAM(i915, cpu_transcoder, port))
 761                     & AUTH_STREAM_TYPE) != data->streams[0].stream_type);
 762
 763         ret = intel_dp_mst_toggle_hdcp_stream_select(connector, enable);
 764         if (ret)
 765                 return ret;
 766
 767         /* Wait for encryption confirmation */
 768         if (intel_de_wait_for_register(i915,
 769                                        HDCP2_STREAM_STATUS(i915, cpu_transcoder, pipe),
 770                                        STREAM_ENCRYPTION_STATUS,
 771                                        enable ? STREAM_ENCRYPTION_STATUS : 0,
 772                                        HDCP_ENCRYPT_STATUS_CHANGE_TIMEOUT_MS)) {
 773                 drm_err(&i915->drm, "Timed out waiting for transcoder: %s stream encryption %s\n",
 774                         transcoder_name(cpu_transcoder), enable ? "enabled" : "disabled");
 775                 return -ETIMEDOUT;
 776         }
 777
 778         return 0;
 779 }
 780
 781 static
 782 int intel_dp_mst_hdcp2_check_link(struct intel_digital_port *dig_port,
 783                                   struct intel_connector *connector)
 784 {
 785         struct intel_hdcp *hdcp = &connector->hdcp;
 786         int ret;
 787
 788         /*
 789          * We do need to do the Link Check only for the connector involved with
 790          * HDCP port authentication and encryption.
 791          * We can re-use the hdcp->is_repeater flag to know that the connector
 792          * involved with HDCP port authentication and encryption.
 793          */
 794         if (hdcp->is_repeater) {
 795                 ret = intel_dp_hdcp2_check_link(dig_port, connector);
 796                 if (ret)
 797                         return ret;
 798         }
 799
 800         return 0;
 801 }
 802
 803 static const struct intel_hdcp_shim intel_dp_mst_hdcp_shim = {
 804         .write_an_aksv = intel_dp_hdcp_write_an_aksv,
 805         .read_bksv = intel_dp_hdcp_read_bksv,
 806         .read_bstatus = intel_dp_hdcp_read_bstatus,
 807         .repeater_present = intel_dp_hdcp_repeater_present,
 808         .read_ri_prime = intel_dp_hdcp_read_ri_prime,
 809         .read_ksv_ready = intel_dp_hdcp_read_ksv_ready,
 810         .read_ksv_fifo = intel_dp_hdcp_read_ksv_fifo,
 811         .read_v_prime_part = intel_dp_hdcp_read_v_prime_part,
 812         .toggle_signalling = intel_dp_hdcp_toggle_signalling,
 813         .stream_encryption = intel_dp_mst_hdcp_stream_encryption,
 814         .check_link = intel_dp_hdcp_check_link,
 815         .hdcp_capable = intel_dp_hdcp_capable,
 816         .write_2_2_msg = intel_dp_hdcp2_write_msg,
 817         .read_2_2_msg = intel_dp_hdcp2_read_msg,
 818         .config_stream_type = intel_dp_hdcp2_config_stream_type,
 819         .stream_2_2_encryption = intel_dp_mst_hdcp2_stream_encryption,
 820         .check_2_2_link = intel_dp_mst_hdcp2_check_link,
 821         .hdcp_2_2_capable = intel_dp_hdcp2_capable,
 822         .protocol = HDCP_PROTOCOL_DP,
 823 };
 824
 825 int intel_dp_hdcp_init(struct intel_digital_port *dig_port,
 826                        struct intel_connector *intel_connector)
 827 {
 828         struct drm_device *dev = intel_connector->base.dev;
 829         struct drm_i915_private *dev_priv = to_i915(dev);
 830         struct intel_encoder *intel_encoder = &dig_port->base;
 831         enum port port = intel_encoder->port;
 832         struct intel_dp *intel_dp = &dig_port->dp;
 833
 834         if (!is_hdcp_supported(dev_priv, port))
 835                 return 0;
 836
 837         if (intel_connector->mst_port)
 838                 return intel_hdcp_init(intel_connector, dig_port,
 839                                        &intel_dp_mst_hdcp_shim);
 840         else if (!intel_dp_is_edp(intel_dp))
 841                 return intel_hdcp_init(intel_connector, dig_port,
 842                                        &intel_dp_hdcp_shim);
 843
 844         return 0;
 845 }