/*
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* Copyright 2019 Advanced Micro Devices, Inc.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
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* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
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* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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* OTHER DEALINGS IN THE SOFTWARE.
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*
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* Authors: AMD
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*
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*/
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#include "hdcp.h"
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enum mod_hdcp_status mod_hdcp_hdcp1_transition(struct mod_hdcp *hdcp,
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struct mod_hdcp_event_context *event_ctx,
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struct mod_hdcp_transition_input_hdcp1 *input,
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struct mod_hdcp_output *output)
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{
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enum mod_hdcp_status status = MOD_HDCP_STATUS_SUCCESS;
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struct mod_hdcp_connection *conn = &hdcp->connection;
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struct mod_hdcp_link_adjustment *adjust = &hdcp->connection.link.adjust;
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switch (current_state(hdcp)) {
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case H1_A0_WAIT_FOR_ACTIVE_RX:
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if (input->bksv_read != PASS || input->bcaps_read != PASS) {
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/* 1A-04: repeatedly attempts on port access failure */
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callback_in_ms(500, output);
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increment_stay_counter(hdcp);
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break;
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}
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callback_in_ms(0, output);
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set_state_id(hdcp, output, H1_A1_EXCHANGE_KSVS);
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break;
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case H1_A1_EXCHANGE_KSVS:
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if (input->create_session != PASS) {
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/* out of sync with psp state */
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adjust->hdcp1.disable = 1;
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fail_and_restart_in_ms(0, &status, output);
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break;
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} else if (input->an_write != PASS ||
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input->aksv_write != PASS ||
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input->bksv_read != PASS ||
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input->bksv_validation != PASS ||
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input->ainfo_write == FAIL) {
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/* 1A-05: consider invalid bksv a failure */
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fail_and_restart_in_ms(0, &status, output);
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break;
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}
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callback_in_ms(300, output);
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set_state_id(hdcp, output,
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H1_A2_COMPUTATIONS_A3_VALIDATE_RX_A6_TEST_FOR_REPEATER);
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break;
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case H1_A2_COMPUTATIONS_A3_VALIDATE_RX_A6_TEST_FOR_REPEATER:
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if (input->bcaps_read != PASS ||
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input->r0p_read != PASS) {
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fail_and_restart_in_ms(0, &status, output);
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break;
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} else if (input->rx_validation != PASS) {
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/* 1A-06: consider invalid r0' a failure */
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/* 1A-08: consider bksv listed in SRM a failure */
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/*
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* some slow RX will fail rx validation when it is
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* not ready. give it more time to react before retry.
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*/
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fail_and_restart_in_ms(1000, &status, output);
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break;
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} else if (!conn->is_repeater && input->encryption != PASS) {
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fail_and_restart_in_ms(0, &status, output);
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break;
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}
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if (conn->is_repeater) {
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callback_in_ms(0, output);
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set_watchdog_in_ms(hdcp, 5000, output);
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set_state_id(hdcp, output, H1_A8_WAIT_FOR_READY);
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} else {
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callback_in_ms(0, output);
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set_state_id(hdcp, output, H1_A45_AUTHENTICATED);
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HDCP_FULL_DDC_TRACE(hdcp);
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}
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break;
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case H1_A45_AUTHENTICATED:
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if (input->link_maintenance != PASS) {
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/* 1A-07: consider invalid ri' a failure */
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/* 1A-07a: consider read ri' not returned a failure */
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fail_and_restart_in_ms(0, &status, output);
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break;
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}
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callback_in_ms(500, output);
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increment_stay_counter(hdcp);
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break;
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case H1_A8_WAIT_FOR_READY:
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if (input->ready_check != PASS) {
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if (event_ctx->event ==
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MOD_HDCP_EVENT_WATCHDOG_TIMEOUT) {
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/* 1B-03: fail hdcp on ksv list READY timeout */
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/* prevent black screen in next attempt */
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adjust->hdcp1.postpone_encryption = 1;
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fail_and_restart_in_ms(0, &status, output);
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} else {
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/* continue ksv list READY polling*/
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callback_in_ms(500, output);
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increment_stay_counter(hdcp);
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}
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break;
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}
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callback_in_ms(0, output);
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set_state_id(hdcp, output, H1_A9_READ_KSV_LIST);
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break;
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case H1_A9_READ_KSV_LIST:
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if (input->bstatus_read != PASS ||
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input->max_cascade_check != PASS ||
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input->max_devs_check != PASS ||
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input->device_count_check != PASS ||
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input->ksvlist_read != PASS ||
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input->vp_read != PASS ||
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input->ksvlist_vp_validation != PASS ||
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input->encryption != PASS) {
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/* 1B-06: consider MAX_CASCADE_EXCEEDED a failure */
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/* 1B-05: consider MAX_DEVS_EXCEEDED a failure */
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/* 1B-04: consider invalid v' a failure */
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fail_and_restart_in_ms(0, &status, output);
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break;
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}
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callback_in_ms(0, output);
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set_state_id(hdcp, output, H1_A45_AUTHENTICATED);
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HDCP_FULL_DDC_TRACE(hdcp);
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break;
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default:
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status = MOD_HDCP_STATUS_INVALID_STATE;
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fail_and_restart_in_ms(0, &status, output);
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break;
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}
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return status;
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}
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enum mod_hdcp_status mod_hdcp_hdcp1_dp_transition(struct mod_hdcp *hdcp,
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struct mod_hdcp_event_context *event_ctx,
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struct mod_hdcp_transition_input_hdcp1 *input,
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struct mod_hdcp_output *output)
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{
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enum mod_hdcp_status status = MOD_HDCP_STATUS_SUCCESS;
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struct mod_hdcp_connection *conn = &hdcp->connection;
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struct mod_hdcp_link_adjustment *adjust = &hdcp->connection.link.adjust;
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switch (current_state(hdcp)) {
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case D1_A0_DETERMINE_RX_HDCP_CAPABLE:
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if (input->bcaps_read != PASS) {
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/* 1A-04: no authentication on bcaps read failure */
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fail_and_restart_in_ms(0, &status, output);
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break;
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} else if (input->hdcp_capable_dp != PASS) {
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adjust->hdcp1.disable = 1;
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fail_and_restart_in_ms(0, &status, output);
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break;
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}
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callback_in_ms(0, output);
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set_state_id(hdcp, output, D1_A1_EXCHANGE_KSVS);
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break;
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case D1_A1_EXCHANGE_KSVS:
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if (input->create_session != PASS) {
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/* out of sync with psp state */
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adjust->hdcp1.disable = 1;
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fail_and_restart_in_ms(0, &status, output);
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break;
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} else if (input->an_write != PASS ||
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input->aksv_write != PASS ||
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input->bksv_read != PASS ||
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input->bksv_validation != PASS ||
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input->ainfo_write == FAIL) {
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/* 1A-05: consider invalid bksv a failure */
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fail_and_restart_in_ms(0, &status, output);
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break;
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}
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set_watchdog_in_ms(hdcp, 100, output);
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set_state_id(hdcp, output, D1_A23_WAIT_FOR_R0_PRIME);
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break;
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case D1_A23_WAIT_FOR_R0_PRIME:
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if (input->bstatus_read != PASS) {
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fail_and_restart_in_ms(0, &status, output);
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break;
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} else if (input->r0p_available_dp != PASS) {
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if (event_ctx->event == MOD_HDCP_EVENT_WATCHDOG_TIMEOUT)
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fail_and_restart_in_ms(0, &status, output);
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else
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increment_stay_counter(hdcp);
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break;
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}
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callback_in_ms(0, output);
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set_state_id(hdcp, output, D1_A2_COMPUTATIONS_A3_VALIDATE_RX_A5_TEST_FOR_REPEATER);
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break;
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case D1_A2_COMPUTATIONS_A3_VALIDATE_RX_A5_TEST_FOR_REPEATER:
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if (input->r0p_read != PASS) {
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fail_and_restart_in_ms(0, &status, output);
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break;
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} else if (input->rx_validation != PASS) {
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if (hdcp->state.stay_count < 2 &&
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!hdcp->connection.is_hdcp1_revoked) {
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/* allow 2 additional retries */
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callback_in_ms(0, output);
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increment_stay_counter(hdcp);
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} else {
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/*
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* 1A-06: consider invalid r0' a failure
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* after 3 attempts.
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* 1A-08: consider bksv listed in SRM a failure
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*/
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/*
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* some slow RX will fail rx validation when it is
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* not ready. give it more time to react before retry.
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*/
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fail_and_restart_in_ms(1000, &status, output);
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}
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break;
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} else if ((!conn->is_repeater && input->encryption != PASS) ||
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(!conn->is_repeater && is_dp_mst_hdcp(hdcp) && input->stream_encryption_dp != PASS)) {
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fail_and_restart_in_ms(0, &status, output);
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break;
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} else if (conn->hdcp1_retry_count < conn->link.adjust.hdcp1.min_auth_retries_wa) {
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fail_and_restart_in_ms(0, &status, output);
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break;
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}
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if (conn->is_repeater) {
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set_watchdog_in_ms(hdcp, 5000, output);
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set_state_id(hdcp, output, D1_A6_WAIT_FOR_READY);
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} else {
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set_state_id(hdcp, output, D1_A4_AUTHENTICATED);
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HDCP_FULL_DDC_TRACE(hdcp);
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}
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break;
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case D1_A4_AUTHENTICATED:
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if (input->link_integrity_check != PASS ||
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input->reauth_request_check != PASS) {
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/* 1A-07: restart hdcp on a link integrity failure */
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fail_and_restart_in_ms(0, &status, output);
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break;
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}
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break;
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case D1_A6_WAIT_FOR_READY:
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if (input->link_integrity_check == FAIL ||
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input->reauth_request_check == FAIL) {
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fail_and_restart_in_ms(0, &status, output);
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break;
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} else if (input->ready_check != PASS) {
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if (event_ctx->event ==
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MOD_HDCP_EVENT_WATCHDOG_TIMEOUT) {
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/* 1B-04: fail hdcp on ksv list READY timeout */
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/* prevent black screen in next attempt */
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adjust->hdcp1.postpone_encryption = 1;
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fail_and_restart_in_ms(0, &status, output);
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} else {
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increment_stay_counter(hdcp);
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}
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break;
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}
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callback_in_ms(0, output);
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set_state_id(hdcp, output, D1_A7_READ_KSV_LIST);
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break;
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case D1_A7_READ_KSV_LIST:
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if (input->binfo_read_dp != PASS ||
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input->max_cascade_check != PASS ||
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input->max_devs_check != PASS) {
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/* 1B-06: consider MAX_DEVS_EXCEEDED a failure */
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/* 1B-07: consider MAX_CASCADE_EXCEEDED a failure */
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fail_and_restart_in_ms(0, &status, output);
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break;
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} else if (input->device_count_check != PASS) {
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/*
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* some slow dongle doesn't update
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* device count as soon as downstream is connected.
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* give it more time to react.
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*/
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adjust->hdcp1.postpone_encryption = 1;
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fail_and_restart_in_ms(1000, &status, output);
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break;
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} else if (input->ksvlist_read != PASS ||
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input->vp_read != PASS) {
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fail_and_restart_in_ms(0, &status, output);
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break;
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} else if (input->ksvlist_vp_validation != PASS) {
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if (hdcp->state.stay_count < 2 &&
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!hdcp->connection.is_hdcp1_revoked) {
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/* allow 2 additional retries */
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callback_in_ms(0, output);
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increment_stay_counter(hdcp);
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} else {
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/*
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* 1B-05: consider invalid v' a failure
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* after 3 attempts.
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*/
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fail_and_restart_in_ms(0, &status, output);
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}
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break;
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} else if (input->encryption != PASS ||
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(is_dp_mst_hdcp(hdcp) && input->stream_encryption_dp != PASS)) {
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fail_and_restart_in_ms(0, &status, output);
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break;
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}
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set_state_id(hdcp, output, D1_A4_AUTHENTICATED);
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HDCP_FULL_DDC_TRACE(hdcp);
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break;
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default:
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fail_and_restart_in_ms(0, &status, output);
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break;
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}
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return status;
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}
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