tjh.dev / kernel
Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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drm/amd/display: Fix HDCP failing to enable after suspend

[Why]
On resume some displays are not ready for HDCP, so they will fail if we
start the hdcp authentintication too soon.

Add a delay so that the displays can be ready before we start.

NOTE: Previoulsy this delay was set to 3 seconds but it was causing
issues with compliance, 2 seconds should enough for compliance and the
s3 resume case.

[How]
Change the Delay to 2 seconds.

Reviewed-by: Aurabindo Pillai <Aurabindo.Pillai@amd.com>
Acked-by: Qingqing Zhuo <qingqing.zhuo@amd.com>
Signed-off-by: Bhawanpreet Lakha <Bhawanpreet.Lakha@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

authored by

Bhawanpreet Lakha and committed by
Alex Deucher 28f7e897 629fcf0b

+1 -1
+1 -1
drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_hdcp.c
··· 562 562 link->dp.dp2_enabled = config->dp2_enabled; 563 563 link->dp.usb4_enabled = config->usb4_enabled; 564 564 display->adjust.disable = MOD_HDCP_DISPLAY_DISABLE_AUTHENTICATION; 565 - link->adjust.auth_delay = 0; 565 + link->adjust.auth_delay = 2; 566 566 link->adjust.hdcp1.disable = 0; 567 567 conn_state = aconnector->base.state; 568 568