drm/amd/display: Workaround to do HDCP authentication twice on certain displays (7bc3807f) · Commits · 戴 / test

[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>

drivers/gpu/drm/amd/display/modules/hdcp/hdcp1_transition.c

+3 −0

Original line number	Diff line number	Diff line
		@@ -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);

drivers/gpu/drm/amd/display/modules/inc/mod_hdcp.h

+2 −1

Original line number	Diff line number	Diff line
		@@ -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 {

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