Re: [Intel-gfx] [PATCH] drm/i915: Avoid modeset when content protection changes

[Anshuman Gupta <anshuman.gupta@intel.com>]

On 2020-07-14 at 21:36:27 +0530, Sean Paul wrote:
> From: Sean Paul <seanpaul@chromium.org>
> 
> Instead of doing a full modeset to enable/disable content protection,
> simply go through the update_pipe flow which was introduced in the
> related patch below. This avoids flashing the screen every time the user
> starts viewing protected content.
> 
> Related: 634852d1f468 ("drm/i915: HDCP state handling in ddi_update_pipe")
> Cc: Ramalingam C <ramalingam.c@intel.com>
> Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
> Cc: Jani Nikula <jani.nikula@linux.intel.com>
> Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
> Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
> Cc: intel-gfx@lists.freedesktop.org
> Signed-off-by: Sean Paul <seanpaul@chromium.org>
> ---
>  drivers/gpu/drm/i915/display/intel_hdcp.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/i915/display/intel_hdcp.c b/drivers/gpu/drm/i915/display/intel_hdcp.c
> index 89a4d294822d..839ce1715253 100644
> --- a/drivers/gpu/drm/i915/display/intel_hdcp.c
> +++ b/drivers/gpu/drm/i915/display/intel_hdcp.c
> @@ -2191,7 +2191,7 @@ void intel_hdcp_atomic_check(struct drm_connector *connector,
>  			return;
>  	}
>  
> -	crtc_state->mode_changed = true;
> +	to_intel_crtc_state(crtc_state)->update_pipe = true;
IMHO intel_crtc_check_fastset() make sure that every crtc_state->mode_changed
will not turn up to a modeset. It seems it is already being taken care.

Thanks,
Anshuman Gupta.

>  }
>  
>  /* Handles the CP_IRQ raised from the DP HDCP sink */
> -- 
> Sean Paul, Software Engineer, Google / Chromium OS
> 
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