[Intel-gfx] [PATCH] drm/i915/psr: Update PSR2 resolution check for Cannonlake

[Pandiyan, Dhinakaran]

On Thu, 2018-03-01 at 22:47 +0200, Ville Syrjälä wrote:
> On Thu, Mar 01, 2018 at 12:38:58PM -0800, Dhinakaran Pandiyan wrote:
> > In fact, apply the Cannonlake resolution check for all > Gen-9 platforms to
> > be safe.
> > 
> > Cc: Rodrigo Vivi <rodrigo.vivi at intel.com>
> > Cc: Elio Martinez Monroy <elio.martinez.monroy at intel.com>
> > Signed-off-by: Dhinakaran Pandiyan <dhinakaran.pandiyan at intel.com>
> > ---
> >  drivers/gpu/drm/i915/intel_psr.c | 11 ++++++-----
> >  1 file changed, 6 insertions(+), 5 deletions(-)
> > 
> > diff --git a/drivers/gpu/drm/i915/intel_psr.c b/drivers/gpu/drm/i915/intel_psr.c
> > index 05770790a4e9..2a2c696c4109 100644
> > --- a/drivers/gpu/drm/i915/intel_psr.c
> > +++ b/drivers/gpu/drm/i915/intel_psr.c
> > @@ -451,8 +451,8 @@ static bool intel_psr2_config_valid(struct intel_dp *intel_dp,
> >  {
> >  	struct intel_digital_port *dig_port = dp_to_dig_port(intel_dp);
> >  	struct drm_i915_private *dev_priv = to_i915(dig_port->base.base.dev);
> > -	const struct drm_display_mode *adjusted_mode =
> > -		&crtc_state->base.adjusted_mode;
> > +	int crtc_h = crtc_state->base.adjusted_mode.crtc_hdisplay;
> > +	int crtc_v = crtc_state->base.adjusted_mode.crtc_vdisplay;
> >  
> >  	/*
> >  	 * FIXME psr2_support is messed up. It's both computed
> > @@ -462,9 +462,10 @@ static bool intel_psr2_config_valid(struct intel_dp *intel_dp,
> >  	if (!dev_priv->psr.psr2_support)
> >  		return false;
> >  
> > -	/* PSR2 is restricted to work with panel resolutions up to 3640x2304 */
> > -	if (adjusted_mode->crtc_hdisplay > 3640 ||
> > -	    adjusted_mode->crtc_vdisplay > 2304) {
> > +	if (crtc_h > 4096 || crtc_v > 2304) {
> > +		DRM_DEBUG_KMS("PSR2 not enabled, panel resolution too big\n");
> > +		return false;
> > +	} else if (IS_GEN9(dev_priv) && (crtc_h > 3640 || crtc_v > 2304)) {
> 
> I would suggest introducing max_w/h or something similar so that you
> don't have to duplicate the actual code.
> 
> When debugging things from logs one might want to know both the requested
> size and the max. So printing those out might be a good idea.

Agreed on both points.


> 
> >  		DRM_DEBUG_KMS("PSR2 not enabled, panel resolution too big\n");
> >  		return false;
> >  	}
> > -- 
> > 2.14.1
> > 
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>