Re: [PATCH v3 10/10] drm/i915/debugfs: Print sink PSR status

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

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@intel.com>
> Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
> Signed-off-by: José Roberto de Souza <jose.souza@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.


Reviewed-by: Dhinakaran Pandiyan <dhinakaran.pandiyan@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);
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