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drm/amd/display: Workaround to do HDCP authentication twice on certain displays

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[Why]
When transitioning from SST to MST, the HDCP repeater in some MST
displays will enter a bad state. The HDCP repeater is recovered after
failing and performing authentication again.

[How]
Add monitor patch to trigger HDCP authentication failure after
encryption is enabled and re-authenticate.

Signed-off-by: George Shen <george.shen@amd.com>
Reviewed-by: Wenjing Liu <Wenjing.Liu@amd.com>
Acked-by: Rodrigo Siqueira <Rodrigo.Siqueira@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
George Shen 2020-02-18 19:15:55 -05:00 committed by Alex Deucher
parent df8e34ac27
commit 7bc3807fe1
2 changed files with 5 additions and 1 deletions
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3
drivers/gpu/drm/amd/display/modules/hdcp/hdcp1_transition.c
View File

@ -230,6 +230,9 @@ enum mod_hdcp_status mod_hdcp_hdcp1_dp_transition(struct mod_hdcp *hdcp,
(!conn->is_repeater && is_dp_mst_hdcp(hdcp) && input->stream_encryption_dp != PASS)) {
fail_and_restart_in_ms(0, &status, output);
break;
} else if (conn->hdcp1_retry_count < conn->link.adjust.hdcp1.min_auth_retries_wa) {
fail_and_restart_in_ms(0, &status, output);
break;
}
if (conn->is_repeater) {
set_watchdog_in_ms(hdcp, 5000, output);

3
drivers/gpu/drm/amd/display/modules/inc/mod_hdcp.h
View File

@ -157,7 +157,8 @@ struct mod_hdcp_display_adjustment {
struct mod_hdcp_link_adjustment_hdcp1 {
uint8_t disable : 1;
uint8_t postpone_encryption : 1;
uint8_t reserved : 6;
uint8_t min_auth_retries_wa : 1;
uint8_t reserved : 5;
};
enum mod_hdcp_force_hdcp_type {