Re: [PATCH 4/9] drm/i915/psr: Check for the specific AUX_FRAME_SYNC cap bit.

["Pandiyan, Dhinakaran" <dhinakaran.pandiyan@intel.com>]

On Wed, 2018-01-31 at 22:48 -0800, Rodrigo Vivi wrote:
> On Sat, Jan 27, 2018 at 02:49:18AM +0000, Dhinakaran Pandiyan wrote:
> > The cap check should be specifically for bit 0 instead of any bit.
> > 
> 
> Any "Fixes:" ?

Fixes: 474d1ec4a3d7 ("drm/i915/skl: Enabling PSR2 SU with frame sync")

I have to clarify that the other bits are reserved and are expected to
read 0. This patch is to make sure we do the right thing, rather than to
fix any known issue.


> 
> > Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
> > Signed-off-by: Dhinakaran Pandiyan <dhinakaran.pandiyan@intel.com>
> 
> 
> Reviewed-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
> 
> 
> > ---
> >  drivers/gpu/drm/i915/intel_psr.c | 2 +-
> >  1 file changed, 1 insertion(+), 1 deletion(-)
> > 
> > diff --git a/drivers/gpu/drm/i915/intel_psr.c b/drivers/gpu/drm/i915/intel_psr.c
> > index a1b878449e83..83874bcd1142 100644
> > --- a/drivers/gpu/drm/i915/intel_psr.c
> > +++ b/drivers/gpu/drm/i915/intel_psr.c
> > @@ -107,7 +107,7 @@ void intel_psr_init_dpcd(struct intel_dp *intel_dp)
> >  				      DP_SINK_DEVICE_AUX_FRAME_SYNC_CAP,
> >  				      &frame_sync_cap) != 1)
> >  			frame_sync_cap = 0;
> > -		dev_priv->psr.aux_frame_sync = frame_sync_cap ? true : false;
> > +		dev_priv->psr.aux_frame_sync = frame_sync_cap & DP_AUX_FRAME_SYNC_CAP;
> >  		/* PSR2 needs frame sync as well */
> >  		dev_priv->psr.psr2_support = dev_priv->psr.aux_frame_sync;
> >  		DRM_DEBUG_KMS("PSR2 %s on sink",
> > -- 
> > 2.14.1
> > 
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