[Intel-gfx] [PATCH] drm/i915/display: Disable PSR2 if TGL Display stepping is B1 from A0

[Mun, Gwan-gyeong]

On Thu, 2021-04-22 at 07:39 -0700, Souza, Jose wrote:
> On Thu, 2021-04-22 at 12:54 +0300, Gwan-gyeong Mun wrote:
> > TGL PSR2 hardware tracking shows momentary flicker and screen shift
> > if
> > TGL Display stepping is B1 from A0.
> > It has been fixed from TGL Display stepping C0.
> > 
> > HSDES: 18015970021
> > HSDES: 2209313811
> > BSpec: 55378
> > 
> > Cc: José Roberto de Souza <jose.souza at intel.com>
> > Signed-off-by: Gwan-gyeong Mun <gwan-gyeong.mun at intel.com>
> > ---
> >  drivers/gpu/drm/i915/display/intel_psr.c | 6 ++++++
> >  1 file changed, 6 insertions(+)
> > 
> > diff --git a/drivers/gpu/drm/i915/display/intel_psr.c
> > b/drivers/gpu/drm/i915/display/intel_psr.c
> > index 4ad756e238c5..2cc9eeab4baf 100644
> > --- a/drivers/gpu/drm/i915/display/intel_psr.c
> > +++ b/drivers/gpu/drm/i915/display/intel_psr.c
> > @@ -739,6 +739,12 @@ static bool intel_psr2_config_valid(struct
> > intel_dp *intel_dp,
> >                 return false;
> >         }
> >  
> > 
> > 
> > 
> > 
> > 
> > 
> > 
> > +       /* Wa_2209313811 */
> > +       if (IS_TGL_DISPLAY_STEP(dev_priv, STEP_A0, STEP_B1)) {
> 
> Missing to check if manual tracking is being used, in this case we
> can enable PSR2 in those display steppings.
Thanks for reviewing. I'll update it in V2.
> 
> > +               drm_dbg_kms(&dev_priv->drm, "PSR2 is not supported
> > this Display stepping\n");
> > +               return false;
> > +       }
> > +
> >         /* Wa_16011181250 */
> >         if (IS_ROCKETLAKE(dev_priv) || IS_ALDERLAKE_S(dev_priv)) {
> >                 drm_dbg_kms(&dev_priv->drm, "PSR2 is defeatured for
> > this platform\n");
>