[Intel-gfx] [PATCH 4/4] drm/i915/display/psr2: Force a PSR exit in the frontbuffer modification flushes

[Srivatsa, Anusha]

> -----Original Message-----
> From: Intel-gfx <intel-gfx-bounces at lists.freedesktop.org> On Behalf Of José
> Roberto de Souza
> Sent: Friday, July 16, 2021 6:12 PM
> To: intel-gfx at lists.freedesktop.org
> Subject: [Intel-gfx] [PATCH 4/4] drm/i915/display/psr2: Force a PSR exit in
> the frontbuffer modification flushes
> 
> The CURSURFLIVE() write do not works with PSR2 selective fetch, the only
> way to update screen is to program PSR2 plane and transcoder registers
> during the vblank.
> 
> We could use the frontbuffer dirty areas set by userspace with
> drmModeDirtyFB() but we would still need to wait for the vblank to properly
> update the PSR2 registers.
> What I think is not worthy the development time considering that there is so
> few userspace applications that makes use of this old method.
> 
> So here forcing a PSR exit in this case, this will guaratee that panel will be
s/ guaratee/ guarantee

> properly updated.
> 
> Cc: Gwan-gyeong Mun <gwan-gyeong.mun at intel.com>
> Signed-off-by: José Roberto de Souza <jose.souza at intel.com>
Reviewed-by: Anusha Srivatsa <anusha.srivatsa at intel.com>

> ---
>  drivers/gpu/drm/i915/display/intel_psr.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/i915/display/intel_psr.c
> b/drivers/gpu/drm/i915/display/intel_psr.c
> index 1c41042841fb1..7316967aba94b 100644
> --- a/drivers/gpu/drm/i915/display/intel_psr.c
> +++ b/drivers/gpu/drm/i915/display/intel_psr.c
> @@ -1448,7 +1448,7 @@ static void psr_force_hw_tracking_exit(struct
> intel_dp *intel_dp)  {
>  	struct drm_i915_private *dev_priv = dp_to_i915(intel_dp);
> 
> -	if (DISPLAY_VER(dev_priv) >= 9)
> +	if (DISPLAY_VER(dev_priv) >= 9 &&
> +!intel_dp->psr.psr2_sel_fetch_enabled)
>  		/*
>  		 * Display WA #0884: skl+
>  		 * This documented WA for bxt can be safely applied
> --
> 2.32.0
> 
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