Re: [Intel-gfx] [PATCH] drm/i915/display: Check async flip state of every crtc and plane once

["Ville Syrjälä" <ville.syrjala@linux.intel.com>]

On Thu, Oct 28, 2021 at 01:34:18PM -0700, José Roberto de Souza wrote:
> For every crtc in state, intel_atomic_check_async() was checking all
> the crtc and plane states again.
> 
> Cc: Karthik B S <karthik.b.s@intel.com>
> Cc: Vandita Kulkarni <vandita.kulkarni@intel.com>
> Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
> Signed-off-by: José Roberto de Souza <jose.souza@intel.com>
> ---
>  drivers/gpu/drm/i915/display/intel_display.c | 38 ++++++++++----------
>  1 file changed, 20 insertions(+), 18 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/display/intel_display.c b/drivers/gpu/drm/i915/display/intel_display.c
> index 79cd158503b37..3b5a8e971343f 100644
> --- a/drivers/gpu/drm/i915/display/intel_display.c
> +++ b/drivers/gpu/drm/i915/display/intel_display.c
> @@ -7707,35 +7707,37 @@ static void kill_bigjoiner_slave(struct intel_atomic_state *state,
>   * correspond to the last vblank and have no relation to the actual time when
>   * the flip done event was sent.
>   */
> -static int intel_atomic_check_async(struct intel_atomic_state *state)
> +static int intel_atomic_check_async(struct intel_atomic_state *state, struct intel_crtc *crtc)
>  {
>  	struct drm_i915_private *i915 = to_i915(state->base.dev);
>  	const struct intel_crtc_state *old_crtc_state, *new_crtc_state;
>  	const struct intel_plane_state *new_plane_state, *old_plane_state;
> -	struct intel_crtc *crtc;
>  	struct intel_plane *plane;
>  	int i;
>  
> -	for_each_oldnew_intel_crtc_in_state(state, crtc, old_crtc_state,
> -					    new_crtc_state, i) {
> -		if (intel_crtc_needs_modeset(new_crtc_state)) {
> -			drm_dbg_kms(&i915->drm, "Modeset Required. Async flip not supported\n");
> -			return -EINVAL;
> -		}
> +	old_crtc_state = intel_atomic_get_old_crtc_state(state, crtc);
> +	new_crtc_state = intel_atomic_get_new_crtc_state(state, crtc);
>  
> -		if (!new_crtc_state->hw.active) {
> -			drm_dbg_kms(&i915->drm, "CRTC inactive\n");
> -			return -EINVAL;
> -		}
> -		if (old_crtc_state->active_planes != new_crtc_state->active_planes) {
> -			drm_dbg_kms(&i915->drm,
> -				    "Active planes cannot be changed during async flip\n");
> -			return -EINVAL;
> -		}
> +	if (intel_crtc_needs_modeset(new_crtc_state)) {
> +		drm_dbg_kms(&i915->drm, "Modeset Required. Async flip not supported\n");
> +		return -EINVAL;
> +	}
> +
> +	if (!new_crtc_state->hw.active) {
> +		drm_dbg_kms(&i915->drm, "CRTC inactive\n");
> +		return -EINVAL;
> +	}
> +	if (old_crtc_state->active_planes != new_crtc_state->active_planes) {
> +		drm_dbg_kms(&i915->drm,
> +			    "Active planes cannot be changed during async flip\n");
> +		return -EINVAL;
>  	}
>  
>  	for_each_oldnew_intel_plane_in_state(state, plane, old_plane_state,
>  					     new_plane_state, i) {
> +		if (plane->base.crtc != &crtc->base)
> +			continue;

Not the pointer you want to be looking at.

> +
>  		/*
>  		 * TODO: Async flip is only supported through the page flip IOCTL
>  		 * as of now. So support currently added for primary plane only.
> @@ -8054,7 +8056,7 @@ static int intel_atomic_check(struct drm_device *dev,
>  	for_each_oldnew_intel_crtc_in_state(state, crtc, old_crtc_state,
>  					    new_crtc_state, i) {
>  		if (new_crtc_state->uapi.async_flip) {
> -			ret = intel_atomic_check_async(state);
> +			ret = intel_atomic_check_async(state, crtc);
>  			if (ret)
>  				goto fail;
>  		}
> -- 
> 2.33.1

-- 
Ville Syrjälä
Intel