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drm/amd/display: Fix unstable HPCP compliance on Chrome Barcelo

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[Why]
Intermittently, there presents two occurrences of 0 stream
commits in a single HPD event. Current HDCP sequence does
not consider such scenerio, and will thus disable HDCP.

[How]
Add condition check to include stream remove and re-enable
case for HDCP enable.

Reviewed-by: Bhawanpreet Lakha <bhawanpreet.lakha@amd.com>
Acked-by: Mikita Lipski <mikita.lipski@amd.com>
Signed-off-by: Qingqing Zhuo <qingqing.zhuo@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Qingqing Zhuo 2021-08-27 06:58:38 -04:00 committed by Alex Deucher
parent 90517c9838
commit 4e00a434a0
1 changed files with 20 additions and 2 deletions
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22
drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
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@ -8067,8 +8067,26 @@ static bool is_content_protection_different(struct drm_connector_state *state,
state->content_protection == DRM_MODE_CONTENT_PROTECTION_ENABLED)
state->content_protection = DRM_MODE_CONTENT_PROTECTION_DESIRED;
/* Check if something is connected/enabled, otherwise we start hdcp but nothing is connected/enabled
* hot-plug, headless s3, dpms
/* Stream removed and re-enabled
*
* Can sometimes overlap with the HPD case,
* thus set update_hdcp to false to avoid
* setting HDCP multiple times.
*
* Handles: DESIRED -> DESIRED (Special case)
*/
if (!(old_state->crtc && old_state->crtc->enabled) &&
state->crtc && state->crtc->enabled &&
connector->state->content_protection == DRM_MODE_CONTENT_PROTECTION_DESIRED) {
dm_con_state->update_hdcp = false;
return true;
}
/* Hot-plug, headless s3, dpms
*
* Only start HDCP if the display is connected/enabled.
* update_hdcp flag will be set to false until the next
* HPD comes in.
*
* Handles: DESIRED -> DESIRED (Special case)
*/