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1/*2 * Copyright 2019 Advanced Micro Devices, Inc.3 *4 * Permission is hereby granted, free of charge, to any person obtaining a5 * copy of this software and associated documentation files (the "Software"),6 * to deal in the Software without restriction, including without limitation7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,8 * and/or sell copies of the Software, and to permit persons to whom the9 * Software is furnished to do so, subject to the following conditions:10 *11 * The above copyright notice and this permission notice shall be included in12 * all copies or substantial portions of the Software.13 *14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL17 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR18 * 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 OR20 * OTHER DEALINGS IN THE SOFTWARE.21 *22 * Authors: AMD23 *24 */25 26#ifndef HDCP_H_27#define HDCP_H_28 29#include "mod_hdcp.h"30#include "hdcp_log.h"31 32#include <drm/display/drm_dp_helper.h>33#include <drm/display/drm_hdcp_helper.h>34 35enum mod_hdcp_trans_input_result {36 UNKNOWN = 0,37 PASS,38 FAIL39};40 41struct mod_hdcp_transition_input_hdcp1 {42 uint8_t bksv_read;43 uint8_t bksv_validation;44 uint8_t create_session;45 uint8_t an_write;46 uint8_t aksv_write;47 uint8_t ainfo_write;48 uint8_t bcaps_read;49 uint8_t r0p_read;50 uint8_t rx_validation;51 uint8_t encryption;52 uint8_t link_maintenance;53 uint8_t ready_check;54 uint8_t bstatus_read;55 uint8_t max_cascade_check;56 uint8_t max_devs_check;57 uint8_t device_count_check;58 uint8_t ksvlist_read;59 uint8_t vp_read;60 uint8_t ksvlist_vp_validation;61 62 uint8_t hdcp_capable_dp;63 uint8_t binfo_read_dp;64 uint8_t r0p_available_dp;65 uint8_t link_integrity_check;66 uint8_t reauth_request_check;67 uint8_t stream_encryption_dp;68};69 70struct mod_hdcp_transition_input_hdcp2 {71 uint8_t hdcp2version_read;72 uint8_t hdcp2_capable_check;73 uint8_t create_session;74 uint8_t ake_init_prepare;75 uint8_t ake_init_write;76 uint8_t rxstatus_read;77 uint8_t ake_cert_available;78 uint8_t ake_cert_read;79 uint8_t ake_cert_validation;80 uint8_t stored_km_write;81 uint8_t no_stored_km_write;82 uint8_t h_prime_available;83 uint8_t h_prime_read;84 uint8_t pairing_available;85 uint8_t pairing_info_read;86 uint8_t h_prime_validation;87 uint8_t lc_init_prepare;88 uint8_t lc_init_write;89 uint8_t l_prime_available_poll;90 uint8_t l_prime_read;91 uint8_t l_prime_validation;92 uint8_t eks_prepare;93 uint8_t eks_write;94 uint8_t enable_encryption;95 uint8_t reauth_request_check;96 uint8_t rx_id_list_read;97 uint8_t device_count_check;98 uint8_t rx_id_list_validation;99 uint8_t repeater_auth_ack_write;100 uint8_t prepare_stream_manage;101 uint8_t stream_manage_write;102 uint8_t stream_ready_available;103 uint8_t stream_ready_read;104 uint8_t stream_ready_validation;105 106 uint8_t rx_caps_read_dp;107 uint8_t content_stream_type_write;108 uint8_t link_integrity_check_dp;109 uint8_t stream_encryption_dp;110};111 112union mod_hdcp_transition_input {113 struct mod_hdcp_transition_input_hdcp1 hdcp1;114 struct mod_hdcp_transition_input_hdcp2 hdcp2;115};116 117struct mod_hdcp_message_hdcp1 {118 uint8_t an[8];119 uint8_t aksv[5];120 uint8_t ainfo;121 uint8_t bksv[5];122 uint16_t r0p;123 uint8_t bcaps;124 uint16_t bstatus;125 uint8_t ksvlist[635];126 uint16_t ksvlist_size;127 uint8_t vp[20];128 129 uint16_t binfo_dp;130};131 132struct mod_hdcp_message_hdcp2 {133 uint8_t hdcp2version_hdmi;134 uint8_t rxcaps_dp[3];135 uint8_t rxstatus[2];136 137 uint8_t ake_init[12];138 uint8_t ake_cert[534];139 uint8_t ake_no_stored_km[129];140 uint8_t ake_stored_km[33];141 uint8_t ake_h_prime[33];142 uint8_t ake_pairing_info[17];143 uint8_t lc_init[9];144 uint8_t lc_l_prime[33];145 uint8_t ske_eks[25];146 uint8_t rx_id_list[177]; // 22 + 5 * 31147 uint16_t rx_id_list_size;148 uint8_t repeater_auth_ack[17];149 uint8_t repeater_auth_stream_manage[68]; // 6 + 2 * 31150 uint16_t stream_manage_size;151 uint8_t repeater_auth_stream_ready[33];152 uint8_t rxstatus_dp;153 uint8_t content_stream_type_dp[2];154};155 156union mod_hdcp_message {157 struct mod_hdcp_message_hdcp1 hdcp1;158 struct mod_hdcp_message_hdcp2 hdcp2;159};160 161struct mod_hdcp_auth_counters {162 uint8_t stream_management_retry_count;163};164 165/* contains values per connection */166struct mod_hdcp_connection {167 struct mod_hdcp_link link;168 uint8_t is_repeater;169 uint8_t is_km_stored;170 uint8_t is_hdcp1_revoked;171 uint8_t is_hdcp2_revoked;172 struct mod_hdcp_trace trace;173 uint8_t hdcp1_retry_count;174 uint8_t hdcp2_retry_count;175};176 177/* contains values per authentication cycle */178struct mod_hdcp_authentication {179 uint32_t id;180 union mod_hdcp_message msg;181 union mod_hdcp_transition_input trans_input;182 struct mod_hdcp_auth_counters count;183};184 185/* contains values per state change */186struct mod_hdcp_state {187 uint8_t id;188 uint32_t stay_count;189};190 191/* per event in a state */192struct mod_hdcp_event_context {193 enum mod_hdcp_event event;194 uint8_t rx_id_list_ready;195 uint8_t unexpected_event;196};197 198struct mod_hdcp {199 /* per link */200 struct mod_hdcp_config config;201 /* per connection */202 struct mod_hdcp_connection connection;203 /* per displays */204 struct mod_hdcp_display displays[MAX_NUM_OF_DISPLAYS];205 /* per authentication attempt */206 struct mod_hdcp_authentication auth;207 /* per state in an authentication */208 struct mod_hdcp_state state;209 /* reserved memory buffer */210 uint8_t buf[2025];211};212 213enum mod_hdcp_initial_state_id {214 HDCP_UNINITIALIZED = 0x0,215 HDCP_INITIAL_STATE_START = HDCP_UNINITIALIZED,216 HDCP_INITIALIZED,217 HDCP_CP_NOT_DESIRED,218 HDCP_INITIAL_STATE_END = HDCP_CP_NOT_DESIRED219};220 221enum mod_hdcp_hdcp1_state_id {222 HDCP1_STATE_START = HDCP_INITIAL_STATE_END,223 H1_A0_WAIT_FOR_ACTIVE_RX,224 H1_A1_EXCHANGE_KSVS,225 H1_A2_COMPUTATIONS_A3_VALIDATE_RX_A6_TEST_FOR_REPEATER,226 H1_A45_AUTHENTICATED,227 H1_A8_WAIT_FOR_READY,228 H1_A9_READ_KSV_LIST,229 HDCP1_STATE_END = H1_A9_READ_KSV_LIST230};231 232enum mod_hdcp_hdcp1_dp_state_id {233 HDCP1_DP_STATE_START = HDCP1_STATE_END,234 D1_A0_DETERMINE_RX_HDCP_CAPABLE,235 D1_A1_EXCHANGE_KSVS,236 D1_A23_WAIT_FOR_R0_PRIME,237 D1_A2_COMPUTATIONS_A3_VALIDATE_RX_A5_TEST_FOR_REPEATER,238 D1_A4_AUTHENTICATED,239 D1_A6_WAIT_FOR_READY,240 D1_A7_READ_KSV_LIST,241 HDCP1_DP_STATE_END = D1_A7_READ_KSV_LIST,242};243 244enum mod_hdcp_hdcp2_state_id {245 HDCP2_STATE_START = HDCP1_DP_STATE_END,246 H2_A0_KNOWN_HDCP2_CAPABLE_RX,247 H2_A1_SEND_AKE_INIT,248 H2_A1_VALIDATE_AKE_CERT,249 H2_A1_SEND_NO_STORED_KM,250 H2_A1_READ_H_PRIME,251 H2_A1_READ_PAIRING_INFO_AND_VALIDATE_H_PRIME,252 H2_A1_SEND_STORED_KM,253 H2_A1_VALIDATE_H_PRIME,254 H2_A2_LOCALITY_CHECK,255 H2_A3_EXCHANGE_KS_AND_TEST_FOR_REPEATER,256 H2_ENABLE_ENCRYPTION,257 H2_A5_AUTHENTICATED,258 H2_A6_WAIT_FOR_RX_ID_LIST,259 H2_A78_VERIFY_RX_ID_LIST_AND_SEND_ACK,260 H2_A9_SEND_STREAM_MANAGEMENT,261 H2_A9_VALIDATE_STREAM_READY,262 HDCP2_STATE_END = H2_A9_VALIDATE_STREAM_READY,263};264 265enum mod_hdcp_hdcp2_dp_state_id {266 HDCP2_DP_STATE_START = HDCP2_STATE_END,267 D2_A0_DETERMINE_RX_HDCP_CAPABLE,268 D2_A1_SEND_AKE_INIT,269 D2_A1_VALIDATE_AKE_CERT,270 D2_A1_SEND_NO_STORED_KM,271 D2_A1_READ_H_PRIME,272 D2_A1_READ_PAIRING_INFO_AND_VALIDATE_H_PRIME,273 D2_A1_SEND_STORED_KM,274 D2_A1_VALIDATE_H_PRIME,275 D2_A2_LOCALITY_CHECK,276 D2_A34_EXCHANGE_KS_AND_TEST_FOR_REPEATER,277 D2_SEND_CONTENT_STREAM_TYPE,278 D2_ENABLE_ENCRYPTION,279 D2_A5_AUTHENTICATED,280 D2_A6_WAIT_FOR_RX_ID_LIST,281 D2_A78_VERIFY_RX_ID_LIST_AND_SEND_ACK,282 D2_A9_SEND_STREAM_MANAGEMENT,283 D2_A9_VALIDATE_STREAM_READY,284 HDCP2_DP_STATE_END = D2_A9_VALIDATE_STREAM_READY,285 HDCP_STATE_END = HDCP2_DP_STATE_END,286};287 288/* hdcp1 executions and transitions */289typedef enum mod_hdcp_status (*mod_hdcp_action)(struct mod_hdcp *hdcp);290uint8_t mod_hdcp_execute_and_set(291 mod_hdcp_action func, uint8_t *flag,292 enum mod_hdcp_status *status, struct mod_hdcp *hdcp, char *str);293enum mod_hdcp_status mod_hdcp_hdcp1_execution(struct mod_hdcp *hdcp,294 struct mod_hdcp_event_context *event_ctx,295 struct mod_hdcp_transition_input_hdcp1 *input);296enum mod_hdcp_status mod_hdcp_hdcp1_dp_execution(struct mod_hdcp *hdcp,297 struct mod_hdcp_event_context *event_ctx,298 struct mod_hdcp_transition_input_hdcp1 *input);299enum mod_hdcp_status mod_hdcp_hdcp1_transition(struct mod_hdcp *hdcp,300 struct mod_hdcp_event_context *event_ctx,301 struct mod_hdcp_transition_input_hdcp1 *input,302 struct mod_hdcp_output *output);303enum mod_hdcp_status mod_hdcp_hdcp1_dp_transition(struct mod_hdcp *hdcp,304 struct mod_hdcp_event_context *event_ctx,305 struct mod_hdcp_transition_input_hdcp1 *input,306 struct mod_hdcp_output *output);307 308/* hdcp2 executions and transitions */309enum mod_hdcp_status mod_hdcp_hdcp2_execution(struct mod_hdcp *hdcp,310 struct mod_hdcp_event_context *event_ctx,311 struct mod_hdcp_transition_input_hdcp2 *input);312enum mod_hdcp_status mod_hdcp_hdcp2_dp_execution(struct mod_hdcp *hdcp,313 struct mod_hdcp_event_context *event_ctx,314 struct mod_hdcp_transition_input_hdcp2 *input);315enum mod_hdcp_status mod_hdcp_hdcp2_transition(struct mod_hdcp *hdcp,316 struct mod_hdcp_event_context *event_ctx,317 struct mod_hdcp_transition_input_hdcp2 *input,318 struct mod_hdcp_output *output);319enum mod_hdcp_status mod_hdcp_hdcp2_dp_transition(struct mod_hdcp *hdcp,320 struct mod_hdcp_event_context *event_ctx,321 struct mod_hdcp_transition_input_hdcp2 *input,322 struct mod_hdcp_output *output);323 324/* log functions */325void mod_hdcp_dump_binary_message(uint8_t *msg, uint32_t msg_size,326 uint8_t *buf, uint32_t buf_size);327void mod_hdcp_log_ddc_trace(struct mod_hdcp *hdcp);328/* TODO: add adjustment log */329 330/* psp functions */331enum mod_hdcp_status mod_hdcp_add_display_to_topology(332 struct mod_hdcp *hdcp, struct mod_hdcp_display *display);333enum mod_hdcp_status mod_hdcp_remove_display_from_topology(334 struct mod_hdcp *hdcp, uint8_t index);335enum mod_hdcp_status mod_hdcp_hdcp1_create_session(struct mod_hdcp *hdcp);336enum mod_hdcp_status mod_hdcp_hdcp1_destroy_session(struct mod_hdcp *hdcp);337enum mod_hdcp_status mod_hdcp_hdcp1_validate_rx(struct mod_hdcp *hdcp);338enum mod_hdcp_status mod_hdcp_hdcp1_enable_encryption(struct mod_hdcp *hdcp);339enum mod_hdcp_status mod_hdcp_hdcp1_validate_ksvlist_vp(struct mod_hdcp *hdcp);340enum mod_hdcp_status mod_hdcp_hdcp1_enable_dp_stream_encryption(341 struct mod_hdcp *hdcp);342enum mod_hdcp_status mod_hdcp_hdcp1_link_maintenance(struct mod_hdcp *hdcp);343enum mod_hdcp_status mod_hdcp_hdcp2_create_session(struct mod_hdcp *hdcp);344enum mod_hdcp_status mod_hdcp_hdcp2_destroy_session(struct mod_hdcp *hdcp);345enum mod_hdcp_status mod_hdcp_hdcp2_prepare_ake_init(struct mod_hdcp *hdcp);346enum mod_hdcp_status mod_hdcp_hdcp2_validate_ake_cert(struct mod_hdcp *hdcp);347enum mod_hdcp_status mod_hdcp_hdcp2_validate_h_prime(struct mod_hdcp *hdcp);348enum mod_hdcp_status mod_hdcp_hdcp2_prepare_lc_init(struct mod_hdcp *hdcp);349enum mod_hdcp_status mod_hdcp_hdcp2_validate_l_prime(struct mod_hdcp *hdcp);350enum mod_hdcp_status mod_hdcp_hdcp2_prepare_eks(struct mod_hdcp *hdcp);351enum mod_hdcp_status mod_hdcp_hdcp2_enable_encryption(struct mod_hdcp *hdcp);352enum mod_hdcp_status mod_hdcp_hdcp2_validate_rx_id_list(struct mod_hdcp *hdcp);353enum mod_hdcp_status mod_hdcp_hdcp2_enable_dp_stream_encryption(354 struct mod_hdcp *hdcp);355enum mod_hdcp_status mod_hdcp_hdcp2_prepare_stream_management(356 struct mod_hdcp *hdcp);357enum mod_hdcp_status mod_hdcp_hdcp2_validate_stream_ready(358 struct mod_hdcp *hdcp);359 360/* ddc functions */361enum mod_hdcp_status mod_hdcp_read_bksv(struct mod_hdcp *hdcp);362enum mod_hdcp_status mod_hdcp_read_bcaps(struct mod_hdcp *hdcp);363enum mod_hdcp_status mod_hdcp_read_bstatus(struct mod_hdcp *hdcp);364enum mod_hdcp_status mod_hdcp_read_r0p(struct mod_hdcp *hdcp);365enum mod_hdcp_status mod_hdcp_read_ksvlist(struct mod_hdcp *hdcp);366enum mod_hdcp_status mod_hdcp_read_vp(struct mod_hdcp *hdcp);367enum mod_hdcp_status mod_hdcp_read_binfo(struct mod_hdcp *hdcp);368enum mod_hdcp_status mod_hdcp_write_aksv(struct mod_hdcp *hdcp);369enum mod_hdcp_status mod_hdcp_write_ainfo(struct mod_hdcp *hdcp);370enum mod_hdcp_status mod_hdcp_write_an(struct mod_hdcp *hdcp);371enum mod_hdcp_status mod_hdcp_read_hdcp2version(struct mod_hdcp *hdcp);372enum mod_hdcp_status mod_hdcp_read_rxcaps(struct mod_hdcp *hdcp);373enum mod_hdcp_status mod_hdcp_read_rxstatus(struct mod_hdcp *hdcp);374enum mod_hdcp_status mod_hdcp_read_ake_cert(struct mod_hdcp *hdcp);375enum mod_hdcp_status mod_hdcp_read_h_prime(struct mod_hdcp *hdcp);376enum mod_hdcp_status mod_hdcp_read_pairing_info(struct mod_hdcp *hdcp);377enum mod_hdcp_status mod_hdcp_read_l_prime(struct mod_hdcp *hdcp);378enum mod_hdcp_status mod_hdcp_read_rx_id_list(struct mod_hdcp *hdcp);379enum mod_hdcp_status mod_hdcp_read_stream_ready(struct mod_hdcp *hdcp);380enum mod_hdcp_status mod_hdcp_write_ake_init(struct mod_hdcp *hdcp);381enum mod_hdcp_status mod_hdcp_write_no_stored_km(struct mod_hdcp *hdcp);382enum mod_hdcp_status mod_hdcp_write_stored_km(struct mod_hdcp *hdcp);383enum mod_hdcp_status mod_hdcp_write_lc_init(struct mod_hdcp *hdcp);384enum mod_hdcp_status mod_hdcp_write_eks(struct mod_hdcp *hdcp);385enum mod_hdcp_status mod_hdcp_write_repeater_auth_ack(struct mod_hdcp *hdcp);386enum mod_hdcp_status mod_hdcp_write_stream_manage(struct mod_hdcp *hdcp);387enum mod_hdcp_status mod_hdcp_write_content_type(struct mod_hdcp *hdcp);388enum mod_hdcp_status mod_hdcp_clear_cp_irq_status(struct mod_hdcp *hdcp);389 390/* hdcp version helpers */391static inline uint8_t is_dp_hdcp(struct mod_hdcp *hdcp)392{393 return (hdcp->connection.link.mode == MOD_HDCP_MODE_DP);394}395 396static inline uint8_t is_dp_mst_hdcp(struct mod_hdcp *hdcp)397{398 return (hdcp->connection.link.mode == MOD_HDCP_MODE_DP &&399 hdcp->connection.link.dp.mst_enabled);400}401 402static inline uint8_t is_hdmi_dvi_sl_hdcp(struct mod_hdcp *hdcp)403{404 return (hdcp->connection.link.mode == MOD_HDCP_MODE_DEFAULT);405}406 407/* hdcp state helpers */408static inline uint8_t current_state(struct mod_hdcp *hdcp)409{410 return hdcp->state.id;411}412 413static inline void set_state_id(struct mod_hdcp *hdcp,414 struct mod_hdcp_output *output, uint8_t id)415{416 memset(&hdcp->state, 0, sizeof(hdcp->state));417 hdcp->state.id = id;418 /* callback timer should be reset per state */419 output->callback_stop = 1;420 output->watchdog_timer_stop = 1;421 HDCP_NEXT_STATE_TRACE(hdcp, id, output);422}423 424static inline uint8_t is_in_hdcp1_states(struct mod_hdcp *hdcp)425{426 return (current_state(hdcp) > HDCP1_STATE_START &&427 current_state(hdcp) <= HDCP1_STATE_END);428}429 430static inline uint8_t is_in_hdcp1_dp_states(struct mod_hdcp *hdcp)431{432 return (current_state(hdcp) > HDCP1_DP_STATE_START &&433 current_state(hdcp) <= HDCP1_DP_STATE_END);434}435 436static inline uint8_t is_in_hdcp2_states(struct mod_hdcp *hdcp)437{438 return (current_state(hdcp) > HDCP2_STATE_START &&439 current_state(hdcp) <= HDCP2_STATE_END);440}441 442static inline uint8_t is_in_hdcp2_dp_states(struct mod_hdcp *hdcp)443{444 return (current_state(hdcp) > HDCP2_DP_STATE_START &&445 current_state(hdcp) <= HDCP2_DP_STATE_END);446}447 448static inline uint8_t is_in_authenticated_states(struct mod_hdcp *hdcp)449{450 return (current_state(hdcp) == D1_A4_AUTHENTICATED ||451 current_state(hdcp) == H1_A45_AUTHENTICATED ||452 current_state(hdcp) == D2_A5_AUTHENTICATED ||453 current_state(hdcp) == H2_A5_AUTHENTICATED);454}455 456static inline uint8_t is_hdcp1(struct mod_hdcp *hdcp)457{458 return (is_in_hdcp1_states(hdcp) || is_in_hdcp1_dp_states(hdcp));459}460 461static inline uint8_t is_hdcp2(struct mod_hdcp *hdcp)462{463 return (is_in_hdcp2_states(hdcp) || is_in_hdcp2_dp_states(hdcp));464}465 466static inline uint8_t is_in_cp_not_desired_state(struct mod_hdcp *hdcp)467{468 return current_state(hdcp) == HDCP_CP_NOT_DESIRED;469}470 471static inline uint8_t is_in_initialized_state(struct mod_hdcp *hdcp)472{473 return current_state(hdcp) == HDCP_INITIALIZED;474}475 476/* transition operation helpers */477static inline void increment_stay_counter(struct mod_hdcp *hdcp)478{479 hdcp->state.stay_count++;480}481 482static inline void fail_and_restart_in_ms(uint16_t time,483 enum mod_hdcp_status *status,484 struct mod_hdcp_output *output)485{486 output->callback_needed = 1;487 output->callback_delay = time;488 output->watchdog_timer_needed = 0;489 output->watchdog_timer_delay = 0;490 *status = MOD_HDCP_STATUS_RESET_NEEDED;491}492 493static inline void callback_in_ms(uint16_t time, struct mod_hdcp_output *output)494{495 output->callback_needed = 1;496 output->callback_delay = time;497}498 499static inline void set_watchdog_in_ms(struct mod_hdcp *hdcp, uint16_t time,500 struct mod_hdcp_output *output)501{502 output->watchdog_timer_needed = 1;503 output->watchdog_timer_delay = time;504}505 506static inline void set_auth_complete(struct mod_hdcp *hdcp,507 struct mod_hdcp_output *output)508{509 output->auth_complete = 1;510 mod_hdcp_log_ddc_trace(hdcp);511}512 513/* connection topology helpers */514static inline uint8_t is_display_active(struct mod_hdcp_display *display)515{516 return display->state >= MOD_HDCP_DISPLAY_ACTIVE;517}518 519static inline uint8_t is_display_encryption_enabled(struct mod_hdcp_display *display)520{521 return display->state >= MOD_HDCP_DISPLAY_ENCRYPTION_ENABLED;522}523 524static inline uint8_t get_active_display_count(struct mod_hdcp *hdcp)525{526 uint8_t active_count = 0;527 uint8_t i;528 529 for (i = 0; i < MAX_NUM_OF_DISPLAYS; i++)530 if (is_display_active(&hdcp->displays[i]))531 active_count++;532 return active_count;533}534 535static inline struct mod_hdcp_display *get_first_active_display(536 struct mod_hdcp *hdcp)537{538 uint8_t i;539 struct mod_hdcp_display *display = NULL;540 541 for (i = 0; i < MAX_NUM_OF_DISPLAYS; i++)542 if (is_display_active(&hdcp->displays[i])) {543 display = &hdcp->displays[i];544 break;545 }546 return display;547}548 549static inline struct mod_hdcp_display *get_active_display_at_index(550 struct mod_hdcp *hdcp, uint8_t index)551{552 uint8_t i;553 struct mod_hdcp_display *display = NULL;554 555 for (i = 0; i < MAX_NUM_OF_DISPLAYS; i++)556 if (hdcp->displays[i].index == index &&557 is_display_active(&hdcp->displays[i])) {558 display = &hdcp->displays[i];559 break;560 }561 return display;562}563 564static inline struct mod_hdcp_display *get_empty_display_container(565 struct mod_hdcp *hdcp)566{567 uint8_t i;568 struct mod_hdcp_display *display = NULL;569 570 for (i = 0; i < MAX_NUM_OF_DISPLAYS; i++)571 if (!is_display_active(&hdcp->displays[i])) {572 display = &hdcp->displays[i];573 break;574 }575 return display;576}577 578static inline void reset_retry_counts(struct mod_hdcp *hdcp)579{580 hdcp->connection.hdcp1_retry_count = 0;581 hdcp->connection.hdcp2_retry_count = 0;582}583 584#endif /* HDCP_H_ */585