[PATCH v2 07/11] drm/i915/psr: Check if resolution is supported by default SU granularity

[Souza, Jose]

On Fri, 2018-11-30 at 16:37 -0800, Dhinakaran Pandiyan wrote:
> On Thu, 2018-11-29 at 18:25 -0800, José Roberto de Souza wrote:
> > Selective updates have a default granularity requirements as stated
> > by eDP spec
> Needs reference to the location in the spec.

Done

> 
> > , so check if HW can match those requirements before
> > enable PSR2.
> typo: enabling*

Done

> 
> > Cc: Dhinakaran Pandiyan <dhinakaran.pandiyan at intel.com>
> > Cc: Rodrigo Vivi <rodrigo.vivi at intel.com>
> > Signed-off-by: José Roberto de Souza <jose.souza at intel.com>
> > ---
> >  drivers/gpu/drm/i915/intel_psr.c | 12 ++++++++++++
> >  1 file changed, 12 insertions(+)
> > 
> > diff --git a/drivers/gpu/drm/i915/intel_psr.c
> > b/drivers/gpu/drm/i915/intel_psr.c
> > index c4a8f476eea9..282ff1bc68a7 100644
> > --- a/drivers/gpu/drm/i915/intel_psr.c
> > +++ b/drivers/gpu/drm/i915/intel_psr.c
> > @@ -539,6 +539,18 @@ static bool intel_psr2_config_valid(struct
> > intel_dp *intel_dp,
> >  		return false;
> >  	}
> >  
> > +	/* HW will always send full lines in SU blocks, so X will
> s/X/starting X coordinate
> 
> > +	 * always be 0 and we only need to check the width to validate
> > +	 * horizontal granularity.
> > +	 * About vertical granularity HW works by SU blocks starting
> > +	 * at each 4 lines with height of 4 lines, what eDP states
> > +	 * that sink should support.
> How about rewriting this as -  
> "HW sends SU blocks of size four scan lines, which means the starting
> X
> coordinate and Y granularity requirements will always be met. We only
> need to validate the SU block width is a multiple of 4."?
> 
> 

Sounds better, thanks

> 
> 
> > +	 */
> > +	if (crtc_hdisplay % 4) {
> > +		DRM_DEBUG_KMS("PSR2 not enabled, default SU granularity
> > not match\n");
> "PSR2 not enabled, hdisplay(%d) not multiple of 4\n"

Done.

> 
> With nits addressed,
> 
> Reviewed-by: Dhinakaran Pandiyan <dhinakaran.pandiyan at intel.com>
> 

Thanks

> > +		return false;
> > +	}
> > +
> >  	return true;
> >  }
> >  
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