drivers/gpu/drm/amd/display/modules/hdcp/hdcp1_transition.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 "hdcp.h"
  27
  28 enum mod_hdcp_status mod_hdcp_hdcp1_transition(struct mod_hdcp *hdcp,
  29                 struct mod_hdcp_event_context *event_ctx,
  30                 struct mod_hdcp_transition_input_hdcp1 *input,
  31                 struct mod_hdcp_output *output)
  32 {
  33         enum mod_hdcp_status status = MOD_HDCP_STATUS_SUCCESS;
  34         struct mod_hdcp_connection *conn = &hdcp->connection;
  35         struct mod_hdcp_link_adjustment *adjust = &hdcp->connection.link.adjust;
  36
  37         switch (current_state(hdcp)) {
  38         case H1_A0_WAIT_FOR_ACTIVE_RX:
  39                 if (input->bksv_read != PASS || input->bcaps_read != PASS) {
  40                         /* 1A-04: repeatedly attempts on port access failure */
  41                         callback_in_ms(500, output);
  42                         increment_stay_counter(hdcp);
  43                         break;
  44                 }
  45                 callback_in_ms(0, output);
  46                 set_state_id(hdcp, output, H1_A1_EXCHANGE_KSVS);
  47                 break;
  48         case H1_A1_EXCHANGE_KSVS:
  49                 if (input->add_topology != PASS ||
  50                                 input->create_session != PASS) {
  51                         /* out of sync with psp state */
  52                         adjust->hdcp1.disable = 1;
  53                         fail_and_restart_in_ms(0, &status, output);
  54                         break;
  55                 } else if (input->an_write != PASS ||
  56                                 input->aksv_write != PASS ||
  57                                 input->bksv_read != PASS ||
  58                                 input->bksv_validation != PASS ||
  59                                 input->ainfo_write == FAIL) {
  60                         /* 1A-05: consider invalid bksv a failure */
  61                         fail_and_restart_in_ms(0, &status, output);
  62                         break;
  63                 }
  64                 callback_in_ms(300, output);
  65                 set_state_id(hdcp, output,
  66                         H1_A2_COMPUTATIONS_A3_VALIDATE_RX_A6_TEST_FOR_REPEATER);
  67                 break;
  68         case H1_A2_COMPUTATIONS_A3_VALIDATE_RX_A6_TEST_FOR_REPEATER:
  69                 if (input->bcaps_read != PASS ||
  70                                 input->r0p_read != PASS) {
  71                         fail_and_restart_in_ms(0, &status, output);
  72                         break;
  73                 } else if (input->rx_validation != PASS) {
  74                         /* 1A-06: consider invalid r0' a failure */
  75                         /* 1A-08: consider bksv listed in SRM a failure */
  76                         /*
  77                          * some slow RX will fail rx validation when it is
  78                          * not ready. give it more time to react before retry.
  79                          */
  80                         fail_and_restart_in_ms(1000, &status, output);
  81                         break;
  82                 } else if (!conn->is_repeater && input->encryption != PASS) {
  83                         fail_and_restart_in_ms(0, &status, output);
  84                         break;
  85                 }
  86                 if (conn->is_repeater) {
  87                         callback_in_ms(0, output);
  88                         set_watchdog_in_ms(hdcp, 5000, output);
  89                         set_state_id(hdcp, output, H1_A8_WAIT_FOR_READY);
  90                 } else {
  91                         callback_in_ms(0, output);
  92                         set_state_id(hdcp, output, H1_A45_AUTHENTICATED);
  93                         HDCP_FULL_DDC_TRACE(hdcp);
  94                 }
  95                 break;
  96         case H1_A45_AUTHENTICATED:
  97                 if (input->link_maintenance != PASS) {
  98                         /* 1A-07: consider invalid ri' a failure */
  99                         /* 1A-07a: consider read ri' not returned a failure */
 100                         fail_and_restart_in_ms(0, &status, output);
 101                         break;
 102                 }
 103                 callback_in_ms(500, output);
 104                 increment_stay_counter(hdcp);
 105                 break;
 106         case H1_A8_WAIT_FOR_READY:
 107                 if (input->ready_check != PASS) {
 108                         if (event_ctx->event ==
 109                                         MOD_HDCP_EVENT_WATCHDOG_TIMEOUT) {
 110                                 /* 1B-03: fail hdcp on ksv list READY timeout */
 111                                 /* prevent black screen in next attempt */
 112                                 adjust->hdcp1.postpone_encryption = 1;
 113                                 fail_and_restart_in_ms(0, &status, output);
 114                         } else {
 115                                 /* continue ksv list READY polling*/
 116                                 callback_in_ms(500, output);
 117                                 increment_stay_counter(hdcp);
 118                         }
 119                         break;
 120                 }
 121                 callback_in_ms(0, output);
 122                 set_state_id(hdcp, output, H1_A9_READ_KSV_LIST);
 123                 break;
 124         case H1_A9_READ_KSV_LIST:
 125                 if (input->bstatus_read != PASS ||
 126                                 input->max_cascade_check != PASS ||
 127                                 input->max_devs_check != PASS ||
 128                                 input->device_count_check != PASS ||
 129                                 input->ksvlist_read != PASS ||
 130                                 input->vp_read != PASS ||
 131                                 input->ksvlist_vp_validation != PASS ||
 132                                 input->encryption != PASS) {
 133                         /* 1B-06: consider MAX_CASCADE_EXCEEDED a failure */
 134                         /* 1B-05: consider MAX_DEVS_EXCEEDED a failure */
 135                         /* 1B-04: consider invalid v' a failure */
 136                         fail_and_restart_in_ms(0, &status, output);
 137                         break;
 138                 }
 139                 callback_in_ms(0, output);
 140                 set_state_id(hdcp, output, H1_A45_AUTHENTICATED);
 141                 HDCP_FULL_DDC_TRACE(hdcp);
 142                 break;
 143         default:
 144                 status = MOD_HDCP_STATUS_INVALID_STATE;
 145                 fail_and_restart_in_ms(0, &status, output);
 146                 break;
 147         }
 148
 149         return status;
 150 }
 151
 152 enum mod_hdcp_status mod_hdcp_hdcp1_dp_transition(struct mod_hdcp *hdcp,
 153                 struct mod_hdcp_event_context *event_ctx,
 154                 struct mod_hdcp_transition_input_hdcp1 *input,
 155                 struct mod_hdcp_output *output)
 156 {
 157         enum mod_hdcp_status status = MOD_HDCP_STATUS_SUCCESS;
 158         struct mod_hdcp_connection *conn = &hdcp->connection;
 159         struct mod_hdcp_link_adjustment *adjust = &hdcp->connection.link.adjust;
 160
 161         switch (current_state(hdcp)) {
 162         case D1_A0_DETERMINE_RX_HDCP_CAPABLE:
 163                 if (input->bcaps_read != PASS) {
 164                         /* 1A-04: no authentication on bcaps read failure */
 165                         fail_and_restart_in_ms(0, &status, output);
 166                         break;
 167                 } else if (input->hdcp_capable_dp != PASS) {
 168                         adjust->hdcp1.disable = 1;
 169                         fail_and_restart_in_ms(0, &status, output);
 170                         break;
 171                 }
 172                 callback_in_ms(0, output);
 173                 set_state_id(hdcp, output, D1_A1_EXCHANGE_KSVS);
 174                 break;
 175         case D1_A1_EXCHANGE_KSVS:
 176                 if (input->add_topology != PASS ||
 177                                 input->create_session != PASS) {
 178                         /* out of sync with psp state */
 179                         adjust->hdcp1.disable = 1;
 180                         fail_and_restart_in_ms(0, &status, output);
 181                         break;
 182                 } else if (input->an_write != PASS ||
 183                                 input->aksv_write != PASS ||
 184                                 input->bksv_read != PASS ||
 185                                 input->bksv_validation != PASS ||
 186                                 input->ainfo_write == FAIL) {
 187                         /* 1A-05: consider invalid bksv a failure */
 188                         fail_and_restart_in_ms(0, &status, output);
 189                         break;
 190                 }
 191                 set_watchdog_in_ms(hdcp, 100, output);
 192                 set_state_id(hdcp, output, D1_A23_WAIT_FOR_R0_PRIME);
 193                 break;
 194         case D1_A23_WAIT_FOR_R0_PRIME:
 195                 if (input->bstatus_read != PASS) {
 196                         fail_and_restart_in_ms(0, &status, output);
 197                         break;
 198                 } else if (input->r0p_available_dp != PASS) {
 199                         if (event_ctx->event == MOD_HDCP_EVENT_WATCHDOG_TIMEOUT)
 200                                 fail_and_restart_in_ms(0, &status, output);
 201                         else
 202                                 increment_stay_counter(hdcp);
 203                         break;
 204                 }
 205                 callback_in_ms(0, output);
 206                 set_state_id(hdcp, output, D1_A2_COMPUTATIONS_A3_VALIDATE_RX_A5_TEST_FOR_REPEATER);
 207                 break;
 208         case D1_A2_COMPUTATIONS_A3_VALIDATE_RX_A5_TEST_FOR_REPEATER:
 209                 if (input->r0p_read != PASS) {
 210                         fail_and_restart_in_ms(0, &status, output);
 211                         break;
 212                 } else if (input->rx_validation != PASS) {
 213                         if (hdcp->state.stay_count < 2) {
 214                                 /* allow 2 additional retries */
 215                                 callback_in_ms(0, output);
 216                                 increment_stay_counter(hdcp);
 217                         } else {
 218                                 /*
 219                                  * 1A-06: consider invalid r0' a failure
 220                                  * after 3 attempts.
 221                                  * 1A-08: consider bksv listed in SRM a failure
 222                                  */
 223                                 /*
 224                                  * some slow RX will fail rx validation when it is
 225                                  * not ready. give it more time to react before retry.
 226                                  */
 227                                 fail_and_restart_in_ms(1000, &status, output);
 228                         }
 229                         break;
 230                 } else if ((!conn->is_repeater && input->encryption != PASS) ||
 231                                 (!conn->is_repeater && is_dp_mst_hdcp(hdcp) && input->stream_encryption_dp != PASS)) {
 232                         fail_and_restart_in_ms(0, &status, output);
 233                         break;
 234                 }
 235                 if (conn->is_repeater) {
 236                         set_watchdog_in_ms(hdcp, 5000, output);
 237                         set_state_id(hdcp, output, D1_A6_WAIT_FOR_READY);
 238                 } else {
 239                         set_state_id(hdcp, output, D1_A4_AUTHENTICATED);
 240                         HDCP_FULL_DDC_TRACE(hdcp);
 241                 }
 242                 break;
 243         case D1_A4_AUTHENTICATED:
 244                 if (input->link_integiry_check != PASS ||
 245                                 input->reauth_request_check != PASS) {
 246                         /* 1A-07: restart hdcp on a link integrity failure */
 247                         fail_and_restart_in_ms(0, &status, output);
 248                         break;
 249                 }
 250                 break;
 251         case D1_A6_WAIT_FOR_READY:
 252                 if (input->link_integiry_check == FAIL ||
 253                                 input->reauth_request_check == FAIL) {
 254                         fail_and_restart_in_ms(0, &status, output);
 255                         break;
 256                 } else if (input->ready_check != PASS) {
 257                         if (event_ctx->event ==
 258                                         MOD_HDCP_EVENT_WATCHDOG_TIMEOUT) {
 259                                 /* 1B-04: fail hdcp on ksv list READY timeout */
 260                                 /* prevent black screen in next attempt */
 261                                 adjust->hdcp1.postpone_encryption = 1;
 262                                 fail_and_restart_in_ms(0, &status, output);
 263                         } else {
 264                                 increment_stay_counter(hdcp);
 265                         }
 266                         break;
 267                 }
 268                 callback_in_ms(0, output);
 269                 set_state_id(hdcp, output, D1_A7_READ_KSV_LIST);
 270                 break;
 271         case D1_A7_READ_KSV_LIST:
 272                 if (input->binfo_read_dp != PASS ||
 273                                 input->max_cascade_check != PASS ||
 274                                 input->max_devs_check != PASS) {
 275                         /* 1B-06: consider MAX_DEVS_EXCEEDED a failure */
 276                         /* 1B-07: consider MAX_CASCADE_EXCEEDED a failure */
 277                         fail_and_restart_in_ms(0, &status, output);
 278                         break;
 279                 } else if (input->device_count_check != PASS) {
 280                         /*
 281                          * some slow dongle doesn't update
 282                          * device count as soon as downstream is connected.
 283                          * give it more time to react.
 284                          */
 285                         adjust->hdcp1.postpone_encryption = 1;
 286                         fail_and_restart_in_ms(1000, &status, output);
 287                         break;
 288                 } else if (input->ksvlist_read != PASS ||
 289                                 input->vp_read != PASS) {
 290                         fail_and_restart_in_ms(0, &status, output);
 291                         break;
 292                 } else if (input->ksvlist_vp_validation != PASS) {
 293                         if (hdcp->state.stay_count < 2) {
 294                                 /* allow 2 additional retries */
 295                                 callback_in_ms(0, output);
 296                                 increment_stay_counter(hdcp);
 297                         } else {
 298                                 /*
 299                                  * 1B-05: consider invalid v' a failure
 300                                  * after 3 attempts.
 301                                  */
 302                                 fail_and_restart_in_ms(0, &status, output);
 303                         }
 304                         break;
 305                 } else if (input->encryption != PASS ||
 306                                 (is_dp_mst_hdcp(hdcp) && input->stream_encryption_dp != PASS)) {
 307                         fail_and_restart_in_ms(0, &status, output);
 308                         break;
 309                 }
 310                 set_state_id(hdcp, output, D1_A4_AUTHENTICATED);
 311                 HDCP_FULL_DDC_TRACE(hdcp);
 312                 break;
 313         default:
 314                 fail_and_restart_in_ms(0, &status, output);
 315                 break;
 316         }
 317
 318         return status;
 319 }