On 2020-10-27 at 22:11:53 +0530, Anshuman Gupta wrote:
> When crtc state need_modeset is true it is not necessary
> it is going to be a real modeset, it can turns to be a
> fastset instead of modeset.
> This turns content protection property to be DESIRED and hdcp
> update_pipe left with property to be in DESIRED state but
> actual hdcp->value was ENABLED.
>
> This issue is caught with DP MST setup, where we have multiple
> connector in same DP_MST topology. When disabling HDCP on one of
> DP MST connector leads to set the crtc state need_modeset to true
> for all other crtc driving the other DP-MST topology connectors.
> This turns up other DP MST connectors CP property to be DESIRED
> despite the actual hdcp->value is ENABLED.
> Above scenario fails the DP MST HDCP IGT test, disabling HDCP on
> one MST stream should not cause to disable HDCP on another MST
> stream on same DP MST topology.
>
> v2:
> Fix WARN_ON(connector->base.registration_state == DRM_CONNECTOR_REGISTERED)
> v3:
> Commit log improvement. [Uma]
> Added a comment before scheduling prop_work. [Uma]
>
> Fixes: 33f9a623bfc6 ("drm/i915/hdcp: Update CP as per the kernel internal
> state")
> Cc: Ramalingam C <ramalinga...@intel.com>
> Signed-off-by: Anshuman Gupta <anshuman.gu...@intel.com>
> ---
> drivers/gpu/drm/i915/display/intel_hdcp.c | 8 ++++++++
> 1 file changed, 8 insertions(+)
>
> diff --git a/drivers/gpu/drm/i915/display/intel_hdcp.c
> b/drivers/gpu/drm/i915/display/intel_hdcp.c
> index b2a4bbcfdcd2..eee8263405b9 100644
> --- a/drivers/gpu/drm/i915/display/intel_hdcp.c
> +++ b/drivers/gpu/drm/i915/display/intel_hdcp.c
> @@ -2221,6 +2221,14 @@ void intel_hdcp_update_pipe(struct intel_atomic_state
> *state,
> desired_and_not_enabled =
> hdcp->value != DRM_MODE_CONTENT_PROTECTION_ENABLED;
> mutex_unlock(&hdcp->mutex);
> + /*
> + * If HDCP already ENABLED and CP property is DESIRED, schedule
> + * prop_work to update correct CP property to user space.
> + */
> + if (!desired_and_not_enabled &&
> !content_protection_type_changed) {
> + drm_connector_get(&connector->base);
Sorry for late review.
why do we need this? and where do we release the connector ref?
-Ram
> + schedule_work(&hdcp->prop_work);
> + }
> }
>
> if (desired_and_not_enabled || content_protection_type_changed)
> --
> 2.26.2
>
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