drivers/gpu/drm/amd/display/dc/hdcp/hdcp_msg.c

   1 /*
   2  * Copyright 2019 Advanced Micro Devices, Inc.
   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 shall be included in
  12  * all copies or substantial portions of the Software.
  13  *
  14  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  15  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  16  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  17  * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
  18  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
  19  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
  20  * OTHER DEALINGS IN THE SOFTWARE.
  21  *
  22  * Authors: AMD
  23  *
  24  */
  25
  26 #include <linux/slab.h>
  27
  28 #include "dm_services.h"
  29 #include "dm_helpers.h"
  30 #include "include/hdcp_types.h"
  31 #include "include/i2caux_interface.h"
  32 #include "include/signal_types.h"
  33 #include "core_types.h"
  34 #include "dc_link_ddc.h"
  35 #include "link_hwss.h"
  36
  37 #define DC_LOGGER \
  38         link->ctx->logger
  39 #define HDCP14_KSV_SIZE 5
  40 #define HDCP14_MAX_KSV_FIFO_SIZE 127*HDCP14_KSV_SIZE
  41
  42 static const bool hdcp_cmd_is_read[] = {
  43         [HDCP_MESSAGE_ID_READ_BKSV] = true,
  44         [HDCP_MESSAGE_ID_READ_RI_R0] = true,
  45         [HDCP_MESSAGE_ID_READ_PJ] = true,
  46         [HDCP_MESSAGE_ID_WRITE_AKSV] = false,
  47         [HDCP_MESSAGE_ID_WRITE_AINFO] = false,
  48         [HDCP_MESSAGE_ID_WRITE_AN] = false,
  49         [HDCP_MESSAGE_ID_READ_VH_X] = true,
  50         [HDCP_MESSAGE_ID_READ_VH_0] = true,
  51         [HDCP_MESSAGE_ID_READ_VH_1] = true,
  52         [HDCP_MESSAGE_ID_READ_VH_2] = true,
  53         [HDCP_MESSAGE_ID_READ_VH_3] = true,
  54         [HDCP_MESSAGE_ID_READ_VH_4] = true,
  55         [HDCP_MESSAGE_ID_READ_BCAPS] = true,
  56         [HDCP_MESSAGE_ID_READ_BSTATUS] = true,
  57         [HDCP_MESSAGE_ID_READ_KSV_FIFO] = true,
  58         [HDCP_MESSAGE_ID_READ_BINFO] = true,
  59         [HDCP_MESSAGE_ID_HDCP2VERSION] = true,
  60         [HDCP_MESSAGE_ID_RX_CAPS] = true,
  61         [HDCP_MESSAGE_ID_WRITE_AKE_INIT] = false,
  62         [HDCP_MESSAGE_ID_READ_AKE_SEND_CERT] = true,
  63         [HDCP_MESSAGE_ID_WRITE_AKE_NO_STORED_KM] = false,
  64         [HDCP_MESSAGE_ID_WRITE_AKE_STORED_KM] = false,
  65         [HDCP_MESSAGE_ID_READ_AKE_SEND_H_PRIME] = true,
  66         [HDCP_MESSAGE_ID_READ_AKE_SEND_PAIRING_INFO] = true,
  67         [HDCP_MESSAGE_ID_WRITE_LC_INIT] = false,
  68         [HDCP_MESSAGE_ID_READ_LC_SEND_L_PRIME] = true,
  69         [HDCP_MESSAGE_ID_WRITE_SKE_SEND_EKS] = false,
  70         [HDCP_MESSAGE_ID_READ_REPEATER_AUTH_SEND_RECEIVERID_LIST] = true,
  71         [HDCP_MESSAGE_ID_WRITE_REPEATER_AUTH_SEND_ACK] = false,
  72         [HDCP_MESSAGE_ID_WRITE_REPEATER_AUTH_STREAM_MANAGE] = false,
  73         [HDCP_MESSAGE_ID_READ_REPEATER_AUTH_STREAM_READY] = true,
  74         [HDCP_MESSAGE_ID_READ_RXSTATUS] = true,
  75         [HDCP_MESSAGE_ID_WRITE_CONTENT_STREAM_TYPE] = false
  76 };
  77
  78 static const uint8_t hdcp_i2c_offsets[] = {
  79         [HDCP_MESSAGE_ID_READ_BKSV] = 0x0,
  80         [HDCP_MESSAGE_ID_READ_RI_R0] = 0x8,
  81         [HDCP_MESSAGE_ID_READ_PJ] = 0xA,
  82         [HDCP_MESSAGE_ID_WRITE_AKSV] = 0x10,
  83         [HDCP_MESSAGE_ID_WRITE_AINFO] = 0x15,
  84         [HDCP_MESSAGE_ID_WRITE_AN] = 0x18,
  85         [HDCP_MESSAGE_ID_READ_VH_X] = 0x20,
  86         [HDCP_MESSAGE_ID_READ_VH_0] = 0x20,
  87         [HDCP_MESSAGE_ID_READ_VH_1] = 0x24,
  88         [HDCP_MESSAGE_ID_READ_VH_2] = 0x28,
  89         [HDCP_MESSAGE_ID_READ_VH_3] = 0x2C,
  90         [HDCP_MESSAGE_ID_READ_VH_4] = 0x30,
  91         [HDCP_MESSAGE_ID_READ_BCAPS] = 0x40,
  92         [HDCP_MESSAGE_ID_READ_BSTATUS] = 0x41,
  93         [HDCP_MESSAGE_ID_READ_KSV_FIFO] = 0x43,
  94         [HDCP_MESSAGE_ID_READ_BINFO] = 0xFF,
  95         [HDCP_MESSAGE_ID_HDCP2VERSION] = 0x50,
  96         [HDCP_MESSAGE_ID_WRITE_AKE_INIT] = 0x60,
  97         [HDCP_MESSAGE_ID_READ_AKE_SEND_CERT] = 0x80,
  98         [HDCP_MESSAGE_ID_WRITE_AKE_NO_STORED_KM] = 0x60,
  99         [HDCP_MESSAGE_ID_WRITE_AKE_STORED_KM] = 0x60,
 100         [HDCP_MESSAGE_ID_READ_AKE_SEND_H_PRIME] = 0x80,
 101         [HDCP_MESSAGE_ID_READ_AKE_SEND_PAIRING_INFO] = 0x80,
 102         [HDCP_MESSAGE_ID_WRITE_LC_INIT] = 0x60,
 103         [HDCP_MESSAGE_ID_READ_LC_SEND_L_PRIME] = 0x80,
 104         [HDCP_MESSAGE_ID_WRITE_SKE_SEND_EKS] = 0x60,
 105         [HDCP_MESSAGE_ID_READ_REPEATER_AUTH_SEND_RECEIVERID_LIST] = 0x80,
 106         [HDCP_MESSAGE_ID_WRITE_REPEATER_AUTH_SEND_ACK] = 0x60,
 107         [HDCP_MESSAGE_ID_WRITE_REPEATER_AUTH_STREAM_MANAGE] = 0x60,
 108         [HDCP_MESSAGE_ID_READ_REPEATER_AUTH_STREAM_READY] = 0x80,
 109         [HDCP_MESSAGE_ID_READ_RXSTATUS] = 0x70
 110 };
 111
 112 struct protection_properties {
 113         bool supported;
 114         bool (*process_transaction)(
 115                 struct dc_link *link,
 116                 struct hdcp_protection_message *message_info);
 117 };
 118
 119 static const struct protection_properties non_supported_protection = {
 120         .supported = false
 121 };
 122
 123 static bool hdmi_14_process_transaction(
 124         struct dc_link *link,
 125         struct hdcp_protection_message *message_info)
 126 {
 127         uint8_t *buff = NULL;
 128         bool result;
 129         const uint8_t hdcp_i2c_addr_link_primary = 0x3a; /* 0x74 >> 1*/
 130         const uint8_t hdcp_i2c_addr_link_secondary = 0x3b; /* 0x76 >> 1*/
 131         struct i2c_command i2c_command;
 132         uint8_t offset = hdcp_i2c_offsets[message_info->msg_id];
 133         struct i2c_payload i2c_payloads[] = {
 134                 { true, 0, 1, &offset },
 135                 /* actual hdcp payload, will be filled later, zeroed for now*/
 136                 { 0 }
 137         };
 138
 139         switch (message_info->link) {
 140         case HDCP_LINK_SECONDARY:
 141                 i2c_payloads[0].address = hdcp_i2c_addr_link_secondary;
 142                 i2c_payloads[1].address = hdcp_i2c_addr_link_secondary;
 143                 break;
 144         case HDCP_LINK_PRIMARY:
 145         default:
 146                 i2c_payloads[0].address = hdcp_i2c_addr_link_primary;
 147                 i2c_payloads[1].address = hdcp_i2c_addr_link_primary;
 148                 break;
 149         }
 150
 151         if (hdcp_cmd_is_read[message_info->msg_id]) {
 152                 i2c_payloads[1].write = false;
 153                 i2c_command.number_of_payloads = ARRAY_SIZE(i2c_payloads);
 154                 i2c_payloads[1].length = message_info->length;
 155                 i2c_payloads[1].data = message_info->data;
 156         } else {
 157                 i2c_command.number_of_payloads = 1;
 158                 buff = kzalloc(message_info->length + 1, GFP_KERNEL);
 159
 160                 if (!buff)
 161                         return false;
 162
 163                 buff[0] = offset;
 164                 memmove(&buff[1], message_info->data, message_info->length);
 165                 i2c_payloads[0].length = message_info->length + 1;
 166                 i2c_payloads[0].data = buff;
 167         }
 168
 169         i2c_command.payloads = i2c_payloads;
 170         i2c_command.engine = I2C_COMMAND_ENGINE_HW;//only HW
 171         i2c_command.speed = link->ddc->ctx->dc->caps.i2c_speed_in_khz;
 172
 173         result = dm_helpers_submit_i2c(
 174                         link->ctx,
 175                         link,
 176                         &i2c_command);
 177         kfree(buff);
 178
 179         return result;
 180 }
 181
 182 static const struct protection_properties hdmi_14_protection = {
 183         .supported = true,
 184         .process_transaction = hdmi_14_process_transaction
 185 };
 186
 187 static const uint32_t hdcp_dpcd_addrs[] = {
 188         [HDCP_MESSAGE_ID_READ_BKSV] = 0x68000,
 189         [HDCP_MESSAGE_ID_READ_RI_R0] = 0x68005,
 190         [HDCP_MESSAGE_ID_READ_PJ] = 0xFFFFFFFF,
 191         [HDCP_MESSAGE_ID_WRITE_AKSV] = 0x68007,
 192         [HDCP_MESSAGE_ID_WRITE_AINFO] = 0x6803B,
 193         [HDCP_MESSAGE_ID_WRITE_AN] = 0x6800c,
 194         [HDCP_MESSAGE_ID_READ_VH_X] = 0x68014,
 195         [HDCP_MESSAGE_ID_READ_VH_0] = 0x68014,
 196         [HDCP_MESSAGE_ID_READ_VH_1] = 0x68018,
 197         [HDCP_MESSAGE_ID_READ_VH_2] = 0x6801c,
 198         [HDCP_MESSAGE_ID_READ_VH_3] = 0x68020,
 199         [HDCP_MESSAGE_ID_READ_VH_4] = 0x68024,
 200         [HDCP_MESSAGE_ID_READ_BCAPS] = 0x68028,
 201         [HDCP_MESSAGE_ID_READ_BSTATUS] = 0x68029,
 202         [HDCP_MESSAGE_ID_READ_KSV_FIFO] = 0x6802c,
 203         [HDCP_MESSAGE_ID_READ_BINFO] = 0x6802a,
 204         [HDCP_MESSAGE_ID_RX_CAPS] = 0x6921d,
 205         [HDCP_MESSAGE_ID_WRITE_AKE_INIT] = 0x69000,
 206         [HDCP_MESSAGE_ID_READ_AKE_SEND_CERT] = 0x6900b,
 207         [HDCP_MESSAGE_ID_WRITE_AKE_NO_STORED_KM] = 0x69220,
 208         [HDCP_MESSAGE_ID_WRITE_AKE_STORED_KM] = 0x692a0,
 209         [HDCP_MESSAGE_ID_READ_AKE_SEND_H_PRIME] = 0x692c0,
 210         [HDCP_MESSAGE_ID_READ_AKE_SEND_PAIRING_INFO] = 0x692e0,
 211         [HDCP_MESSAGE_ID_WRITE_LC_INIT] = 0x692f0,
 212         [HDCP_MESSAGE_ID_READ_LC_SEND_L_PRIME] = 0x692f8,
 213         [HDCP_MESSAGE_ID_WRITE_SKE_SEND_EKS] = 0x69318,
 214         [HDCP_MESSAGE_ID_READ_REPEATER_AUTH_SEND_RECEIVERID_LIST] = 0x69330,
 215         [HDCP_MESSAGE_ID_WRITE_REPEATER_AUTH_SEND_ACK] = 0x693e0,
 216         [HDCP_MESSAGE_ID_WRITE_REPEATER_AUTH_STREAM_MANAGE] = 0x693f0,
 217         [HDCP_MESSAGE_ID_READ_REPEATER_AUTH_STREAM_READY] = 0x69473,
 218         [HDCP_MESSAGE_ID_READ_RXSTATUS] = 0x69493,
 219         [HDCP_MESSAGE_ID_WRITE_CONTENT_STREAM_TYPE] = 0x69494
 220 };
 221
 222 static bool dpcd_access_helper(
 223         struct dc_link *link,
 224         uint32_t length,
 225         uint8_t *data,
 226         uint32_t dpcd_addr,
 227         bool is_read)
 228 {
 229         enum dc_status status;
 230         uint32_t cur_length = 0;
 231         uint32_t offset = 0;
 232         uint32_t ksv_read_size = 0x6803b - 0x6802c;
 233
 234         /* Read KSV, need repeatedly handle */
 235         if (dpcd_addr == 0x6802c) {
 236                 if (length % HDCP14_KSV_SIZE) {
 237                         DC_LOG_ERROR("%s: KsvFifo Size(%d) is not a multiple of HDCP14_KSV_SIZE(%d)\n",
 238                                 __func__,
 239                                 length,
 240                                 HDCP14_KSV_SIZE);
 241                 }
 242                 if (length > HDCP14_MAX_KSV_FIFO_SIZE) {
 243                         DC_LOG_ERROR("%s: KsvFifo Size(%d) is greater than HDCP14_MAX_KSV_FIFO_SIZE(%d)\n",
 244                                 __func__,
 245                                 length,
 246                                 HDCP14_MAX_KSV_FIFO_SIZE);
 247                 }
 248
 249                 DC_LOG_ERROR("%s: Reading %d Ksv(s) from KsvFifo\n",
 250                         __func__,
 251                         length / HDCP14_KSV_SIZE);
 252
 253                 while (length > 0) {
 254                         if (length > ksv_read_size) {
 255                                 status = core_link_read_dpcd(
 256                                         link,
 257                                         dpcd_addr + offset,
 258                                         data + offset,
 259                                         ksv_read_size);
 260
 261                                 data += ksv_read_size;
 262                                 length -= ksv_read_size;
 263                         } else {
 264                                 status = core_link_read_dpcd(
 265                                         link,
 266                                         dpcd_addr + offset,
 267                                         data + offset,
 268                                         length);
 269
 270                                 data += length;
 271                                 length = 0;
 272                         }
 273
 274                         if (status != DC_OK)
 275                                 return false;
 276                 }
 277         } else {
 278                 while (length > 0) {
 279                         if (length > DEFAULT_AUX_MAX_DATA_SIZE)
 280                                 cur_length = DEFAULT_AUX_MAX_DATA_SIZE;
 281                         else
 282                                 cur_length = length;
 283
 284                         if (is_read) {
 285                                 status = core_link_read_dpcd(
 286                                         link,
 287                                         dpcd_addr + offset,
 288                                         data + offset,
 289                                         cur_length);
 290                         } else {
 291                                 status = core_link_write_dpcd(
 292                                         link,
 293                                         dpcd_addr + offset,
 294                                         data + offset,
 295                                         cur_length);
 296                         }
 297
 298                         if (status != DC_OK)
 299                                 return false;
 300
 301                         length -= cur_length;
 302                         offset += cur_length;
 303                 }
 304         }
 305         return true;
 306 }
 307
 308 static bool dp_11_process_transaction(
 309         struct dc_link *link,
 310         struct hdcp_protection_message *message_info)
 311 {
 312         return dpcd_access_helper(
 313                 link,
 314                 message_info->length,
 315                 message_info->data,
 316                 hdcp_dpcd_addrs[message_info->msg_id],
 317                 hdcp_cmd_is_read[message_info->msg_id]);
 318 }
 319
 320 static const struct protection_properties dp_11_protection = {
 321         .supported = true,
 322         .process_transaction = dp_11_process_transaction
 323 };
 324
 325 static const struct protection_properties *get_protection_properties_by_signal(
 326         struct dc_link *link,
 327         enum signal_type st,
 328         enum hdcp_version version)
 329 {
 330         switch (version) {
 331         case HDCP_VERSION_14:
 332                 switch (st) {
 333                 case SIGNAL_TYPE_DVI_SINGLE_LINK:
 334                 case SIGNAL_TYPE_DVI_DUAL_LINK:
 335                 case SIGNAL_TYPE_HDMI_TYPE_A:
 336                         return &hdmi_14_protection;
 337                 case SIGNAL_TYPE_DISPLAY_PORT:
 338                         if (link &&
 339                                 (link->dpcd_caps.dongle_type == DISPLAY_DONGLE_DP_VGA_CONVERTER ||
 340                                 link->dpcd_caps.dongle_caps.dongle_type == DISPLAY_DONGLE_DP_VGA_CONVERTER)) {
 341                                 return &non_supported_protection;
 342                         }
 343                         return &dp_11_protection;
 344                 case SIGNAL_TYPE_DISPLAY_PORT_MST:
 345                 case SIGNAL_TYPE_EDP:
 346                         return &dp_11_protection;
 347                 default:
 348                         return &non_supported_protection;
 349                 }
 350                 break;
 351         case HDCP_VERSION_22:
 352                 switch (st) {
 353                 case SIGNAL_TYPE_DVI_SINGLE_LINK:
 354                 case SIGNAL_TYPE_DVI_DUAL_LINK:
 355                 case SIGNAL_TYPE_HDMI_TYPE_A:
 356                         return &hdmi_14_protection; //todo version2.2
 357                 case SIGNAL_TYPE_DISPLAY_PORT:
 358                 case SIGNAL_TYPE_DISPLAY_PORT_MST:
 359                 case SIGNAL_TYPE_EDP:
 360                         return &dp_11_protection;  //todo version2.2
 361                 default:
 362                         return &non_supported_protection;
 363                 }
 364                 break;
 365         default:
 366                 return &non_supported_protection;
 367         }
 368 }
 369
 370 enum hdcp_message_status dc_process_hdcp_msg(
 371         enum signal_type signal,
 372         struct dc_link *link,
 373         struct hdcp_protection_message *message_info)
 374 {
 375         enum hdcp_message_status status = HDCP_MESSAGE_FAILURE;
 376         uint32_t i = 0;
 377
 378         const struct protection_properties *protection_props;
 379
 380         if (!message_info)
 381                 return HDCP_MESSAGE_UNSUPPORTED;
 382
 383         if (message_info->msg_id < HDCP_MESSAGE_ID_READ_BKSV ||
 384                 message_info->msg_id >= HDCP_MESSAGE_ID_MAX)
 385                 return HDCP_MESSAGE_UNSUPPORTED;
 386
 387         protection_props =
 388                 get_protection_properties_by_signal(
 389                         link,
 390                         signal,
 391                         message_info->version);
 392
 393         if (!protection_props->supported)
 394                 return HDCP_MESSAGE_UNSUPPORTED;
 395
 396         if (protection_props->process_transaction(
 397                 link,
 398                 message_info)) {
 399                 status = HDCP_MESSAGE_SUCCESS;
 400         } else {
 401                 for (i = 0; i < message_info->max_retries; i++) {
 402                         if (protection_props->process_transaction(
 403                                                 link,
 404                                                 message_info)) {
 405                                 status = HDCP_MESSAGE_SUCCESS;
 406                                 break;
 407                         }
 408                 }
 409         }
 410
 411         return status;
 412 }
 413