[Intel-gfx] [PATCH v3 10/10] drm/i915/debugfs: Print sink PSR status

[Souza, Jose]

On Fri, 2018-03-30 at 11:28 -0700, Pandiyan, Dhinakaran wrote:
> On Wed, 2018-03-28 at 15:30 -0700, José Roberto de Souza wrote:
> > IGT tests could be improved with sink status, knowing for sure that
> > hardware have activate or exit PSR.
> > 
> > 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>
> > ---
> > 
> > v3: rebased
> > 
> >  drivers/gpu/drm/i915/i915_debugfs.c | 29
> > +++++++++++++++++++++++++++++
> >  1 file changed, 29 insertions(+)
> > 
> > diff --git a/drivers/gpu/drm/i915/i915_debugfs.c
> > b/drivers/gpu/drm/i915/i915_debugfs.c
> > index 1dba2c451255..89dc5b05ec24 100644
> > --- a/drivers/gpu/drm/i915/i915_debugfs.c
> > +++ b/drivers/gpu/drm/i915/i915_debugfs.c
> > @@ -2603,6 +2603,26 @@ static const char *psr2_live_status(u32 val)
> >  	return "unknown";
> >  }
> >  
> > +static const char *psr_sink_self_refresh_status(u8 val)
> 
> nit:		     psr_sink_status() is concise,
> "psr_self_refresh" sounds
> redundant.
> 
> > +{
> > +	static const char * const sink_status[] = {
> > +		"inactive",
> > +		"transitioning to active",
> 
> We muddle the meaning of these statuses by paraphrasing, it is better
> write these strings exactly as the states are defined in the spec.
> 
> > +		"active",
> > +		"active receiving selective update",
> 
> For example, this state corresponds to the capture of full static
> frame
> too.


It is fine this way?

	static const char * const sink_status[] = {
		"inactive",
		"transition to active, capture and display",
		"active, display from RFB",
		"active, capture and display on sink device timings",
		"transition to inactive, capture and display, timing
re-sync",
		"reserved",
		"reserved",
		"sink internal error"
	};


> 
> 
> Reviewed-by: Dhinakaran Pandiyan <dhinakaran.pandiyan at intel.com> with
> the nits addressed, thanks for the patch.
> 
> > +		"transitioning to inactive",
> > +		"reserved",
> > +		"reserved",
> > +		"sink internal error"
> > +	};
> > +
> > +	val &= DP_PSR_SINK_STATE_MASK;
> > +	if (val < ARRAY_SIZE(sink_status))
> > +		return sink_status[val];
> > +
> > +	return "unknown";
> > +}
> > +
> >  static int i915_edp_psr_status(struct seq_file *m, void *data)
> >  {
> >  	struct drm_i915_private *dev_priv = node_to_i915(m-
> > >private);
> > @@ -2684,6 +2704,15 @@ static int i915_edp_psr_status(struct
> > seq_file *m, void *data)
> >  		seq_printf(m, "EDP_PSR2_STATUS: %x [%s]\n",
> >  			   psr2, psr2_live_status(psr2));
> >  	}
> > +
> > +	if (dev_priv->psr.enabled) {
> > +		struct drm_dp_aux *aux = &dev_priv->psr.enabled-
> > >aux;
> > +		u8 val;
> > +
> > +		if (drm_dp_dpcd_readb(aux, DP_PSR_STATUS, &val) ==
> > 1)
> > +			seq_printf(m, "Sink self refresh status:
> > 0x%x [%s]\n",
> > +				   val,
> > psr_sink_self_refresh_status(val));
> > +	}
> >  	mutex_unlock(&dev_priv->psr.lock);
> >  
> >  	intel_runtime_pm_put(dev_priv);