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