[Intel-gfx] [PATCH 3/5] drm/i915/psr: Do not print last attempted entry or exit in PSR debugfs while in PSR2

[Dhinakaran Pandiyan]

On Tue, 2018-12-04 at 15:00 -0800, José Roberto de Souza wrote:
> PSR2 only trigger interruptions for AUX error, so let's not print
> useless information in debugsfs.
> Also adding a comment to intel_psr_irq_handler() about that.

The code still allows the enabling of interrupt debugging for PSR2. Fix
that to reject debugfs writes?


> 
> Cc: Rodrigo Vivi <rodrigo.vivi at intel.com>
> Cc: Dhinakaran Pandiyan <dhinakaran.pandiyan at intel.com>
> Signed-off-by: José Roberto de Souza <jose.souza at intel.com>
> ---
>  drivers/gpu/drm/i915/i915_debugfs.c | 2 +-
>  drivers/gpu/drm/i915/intel_psr.c    | 1 +
>  2 files changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/i915/i915_debugfs.c
> b/drivers/gpu/drm/i915/i915_debugfs.c
> index 86303ba02666..505d93b31eb6 100644
> --- a/drivers/gpu/drm/i915/i915_debugfs.c
> +++ b/drivers/gpu/drm/i915/i915_debugfs.c
> @@ -2760,7 +2760,7 @@ static int i915_edp_psr_status(struct seq_file
> *m, void *data)
>  		seq_printf(m, "Performance counter: %u\n", val);
>  	}
>  
> -	if (psr->debug & I915_PSR_DEBUG_IRQ) {
> +	if ((psr->debug & I915_PSR_DEBUG_IRQ) && !psr->psr2_enabled) {
>  		seq_printf(m, "Last attempted entry at: %lld\n",
>  			   psr->last_entry_attempt);
>  		seq_printf(m, "Last exit at: %lld\n", psr->last_exit);
> diff --git a/drivers/gpu/drm/i915/intel_psr.c
> b/drivers/gpu/drm/i915/intel_psr.c
> index 15a2121aa64f..85349a57689c 100644
> --- a/drivers/gpu/drm/i915/intel_psr.c
> +++ b/drivers/gpu/drm/i915/intel_psr.c
> @@ -203,6 +203,7 @@ void intel_psr_irq_handler(struct
> drm_i915_private *dev_priv, u32 psr_iir)
>  			mask |= EDP_PSR_ERROR(shift);
>  		}
>  
> +		/* PSR2 don't trigger PRE_ENTRY and POST_EXIT
> interruptions */
>  		if (psr_iir & EDP_PSR_PRE_ENTRY(shift)) {
>  			dev_priv->psr.last_entry_attempt = time_ns;
>  			DRM_DEBUG_KMS("[transcoder %s] PSR entry
> attempt in 2 vblanks\n",