[Intel-gfx] [PATCH 2/2] drm/i915/psr: Disable PSR before disable pipe

[Hogander, Jouni]

On Thu, 2022-07-14 at 08:07 -0700, José Roberto de Souza wrote:
> The issue here was on for_each_intel_encoder_mask_with_psr() over the
> new_crtc_state encoder mask, so if the CRTC was being disabled mask
> would be zero and it would not have any chance to disable PSR.
> 
> So here doing for_each_intel_encoder_mask_with_psr() over the
> old_crtc_state encoder mask and then using the new_crtc_state to
> check if PSR needs to be disabled.
> 
> Cc: Jouni Högander <jouni.hogander at intel.com>
> Cc: Stanislav Lisovskiy <stanislav.lisovskiy at intel.com>
> Signed-off-by: José Roberto de Souza <jose.souza at intel.com>
> ---
>  drivers/gpu/drm/i915/display/intel_psr.c | 14 ++++++++------
>  1 file changed, 8 insertions(+), 6 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/display/intel_psr.c
> b/drivers/gpu/drm/i915/display/intel_psr.c
> index e6a870641cd25..98c3c8015a5c4 100644
> --- a/drivers/gpu/drm/i915/display/intel_psr.c
> +++ b/drivers/gpu/drm/i915/display/intel_psr.c
> @@ -1863,7 +1863,9 @@ void intel_psr_pre_plane_update(struct
> intel_atomic_state *state,
>  				struct intel_crtc *crtc)
>  {
>  	struct drm_i915_private *i915 = to_i915(state->base.dev);
> -	const struct intel_crtc_state *crtc_state =
> +	const struct intel_crtc_state *old_crtc_state =
> +		intel_atomic_get_old_crtc_state(state, crtc);
> +	const struct intel_crtc_state *new_crtc_state =
>  		intel_atomic_get_new_crtc_state(state, crtc);
>  	struct intel_encoder *encoder;
>  
> @@ -1871,7 +1873,7 @@ void intel_psr_pre_plane_update(struct
> intel_atomic_state *state,
>  		return;
>  
>  	for_each_intel_encoder_mask_with_psr(state->base.dev, encoder,
> -					     crtc_state-
> >uapi.encoder_mask) {
> +					     old_crtc_state-
> >uapi.encoder_mask) {

I would add comment here explaining why using encoder mask from
old_crtc_state, but using new_crtc_state inside the loop. It's up to
you:

Reviewed-by: Jouni Högander <jouni.hogander at intel.com>

>  		struct intel_dp *intel_dp = enc_to_intel_dp(encoder);
>  		struct intel_psr *psr = &intel_dp->psr;
>  		bool needs_to_disable = false;
> @@ -1884,10 +1886,10 @@ void intel_psr_pre_plane_update(struct
> intel_atomic_state *state,
>  		 * - All planes will go inactive
>  		 * - Changing between PSR versions
>  		 */
> -		needs_to_disable |=
> intel_crtc_needs_modeset(crtc_state);
> -		needs_to_disable |= !crtc_state->has_psr;
> -		needs_to_disable |= !crtc_state->active_planes;
> -		needs_to_disable |= crtc_state->has_psr2 != psr-
> >psr2_enabled;
> +		needs_to_disable |=
> intel_crtc_needs_modeset(new_crtc_state);
> +		needs_to_disable |= !new_crtc_state->has_psr;
> +		needs_to_disable |= !new_crtc_state->active_planes;
> +		needs_to_disable |= new_crtc_state->has_psr2 != psr-
> >psr2_enabled;
>  
>  		if (psr->enabled && needs_to_disable)
>  			intel_psr_disable_locked(intel_dp);