Re: [PATCH v2 2/6] drm/i915: Refactor PSR status debugfs

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On Thu, 2019-01-03 at 06:21 -0800, José Roberto de Souza wrote:
> The old debugfs fields was not following a naming partern and it was
> a bit confusing.
> 
> So it went from:
> ~$ sudo more /sys/kernel/debug/dri/0/i915_edp_psr_status
> Sink_Support: yes
> PSR mode: PSR1
> Enabled: yes
> Busy frontbuffer bits: 0x000
> Main link in standby mode: no
> HW Enabled & Active bit: yes
> Source PSR status: 0x24050006 [SRDONACK]
> 
> To:
> ~$ sudo more /sys/kernel/debug/dri/0/i915_edp_psr_status
> Sink support: yes [0x03]
> PSR mode: PSR1 enabled
> Source PSR ctl: enabled [0x81f00e26]
> Source PSR status: IDLE [0x04010006]
> Busy frontbuffer bits: 0x00000000
> 
> The 'Main link in standby mode' was removed as it is not useful but
> if needed by someone the information is still in the register value
> of 'Source PSR ctl' inside of the brackets, PSR mode and Enabled was
> squashed into PSR mode, some renames and reorders and we have this
> cleaner version. This will also make easy to parse debugfs for IGT
> tests.
> 
> v2: Printing sink PSR version with only 2 hex digits as it is a byte
> 
> Cc: Rodrigo Vivi <rodrigo.vivi@xxxxxxxxx>
> Cc: Dhinakaran Pandiyan <dhinakaran.pandiyan@xxxxxxxxx>
> Suggested-by: Dhinakaran Pandiyan <dhinakaran.pandiyan@xxxxxxxxx>
> Signed-off-by: José Roberto de Souza <jose.souza@xxxxxxxxx>
> ---
>  drivers/gpu/drm/i915/i915_debugfs.c | 95 ++++++++++++++-------------
> --
>  1 file changed, 47 insertions(+), 48 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/i915_debugfs.c
> b/drivers/gpu/drm/i915/i915_debugfs.c
> index 193823048f96..1a31921598e7 100644
> --- a/drivers/gpu/drm/i915/i915_debugfs.c
> +++ b/drivers/gpu/drm/i915/i915_debugfs.c
> @@ -2529,7 +2529,8 @@ DEFINE_SHOW_ATTRIBUTE(i915_psr_sink_status);
>  static void
>  psr_source_status(struct drm_i915_private *dev_priv, struct seq_file
> *m)
>  {
> -	u32 val, psr_status;
> +	u32 val, status_val;
> +	const char *status = "unknown";
>  
>  	if (dev_priv->psr.psr2_enabled) {
>  		static const char * const live_status[] = {
> @@ -2545,14 +2546,11 @@ psr_source_status(struct drm_i915_private
> *dev_priv, struct seq_file *m)
>  			"BUF_ON",
>  			"TG_ON"
>  		};
> -		psr_status = I915_READ(EDP_PSR2_STATUS);
> -		val = (psr_status & EDP_PSR2_STATUS_STATE_MASK) >>
> -			EDP_PSR2_STATUS_STATE_SHIFT;
> -		if (val < ARRAY_SIZE(live_status)) {
> -			seq_printf(m, "Source PSR status: 0x%x [%s]\n",
> -				   psr_status, live_status[val]);
> -			return;
> -		}
> +		val = I915_READ(EDP_PSR2_STATUS);
> +		status_val = (val & EDP_PSR2_STATUS_STATE_MASK) >>
> +			      EDP_PSR2_STATUS_STATE_SHIFT;
> +		if (status_val < ARRAY_SIZE(live_status))
> +			status = live_status[status_val];
>  	} else {
>  		static const char * const live_status[] = {
>  			"IDLE",
> @@ -2564,74 +2562,75 @@ psr_source_status(struct drm_i915_private
> *dev_priv, struct seq_file *m)
>  			"SRDOFFACK",
>  			"SRDENT_ON",
>  		};
> -		psr_status = I915_READ(EDP_PSR_STATUS);
> -		val = (psr_status & EDP_PSR_STATUS_STATE_MASK) >>
> -			EDP_PSR_STATUS_STATE_SHIFT;
> -		if (val < ARRAY_SIZE(live_status)) {
> -			seq_printf(m, "Source PSR status: 0x%x [%s]\n",
> -				   psr_status, live_status[val]);
> -			return;
> -		}
> +		val = I915_READ(EDP_PSR_STATUS);
> +		status_val = (val & EDP_PSR_STATUS_STATE_MASK) >>
> +			      EDP_PSR_STATUS_STATE_SHIFT;
> +		if (status_val < ARRAY_SIZE(live_status))
> +			status = live_status[status_val];
>  	}
>  
> -	seq_printf(m, "Source PSR status: 0x%x [%s]\n", psr_status,
> "unknown");
> +	seq_printf(m, "Source PSR status: %s [0x%08x]\n", status, val);
>  }
>  
>  static int i915_edp_psr_status(struct seq_file *m, void *data)
>  {
>  	struct drm_i915_private *dev_priv = node_to_i915(m->private);
> -	u32 psrperf = 0;
> -	bool enabled = false;
> -	bool sink_support;
> +	struct i915_psr *psr = &dev_priv->psr;
> +	const char *status;
> +	bool enabled;
> +	u32 val;
>  
>  	if (!HAS_PSR(dev_priv))
>  		return -ENODEV;
>  
> -	sink_support = dev_priv->psr.sink_support;
> -	seq_printf(m, "Sink_Support: %s\n", yesno(sink_support));
> -	if (!sink_support)
> +	seq_printf(m, "Sink support: %s", yesno(psr->sink_support));
> +	seq_printf(m, " [0x%02x]\n", psr->dp->psr_dpcd[0]);
> +	if (!psr->sink_support)
>  		return 0;
>  
>  	intel_runtime_pm_get(dev_priv);
> +	mutex_lock(&psr->lock);
>  
> -	mutex_lock(&dev_priv->psr.lock);
> -	seq_printf(m, "PSR mode: %s\n",
> -		   dev_priv->psr.psr2_enabled ? "PSR2" : "PSR1");
> -	seq_printf(m, "Enabled: %s\n", yesno(dev_priv->psr.enabled));
> -	seq_printf(m, "Busy frontbuffer bits: 0x%03x\n",
> -		   dev_priv->psr.busy_frontbuffer_bits);
> -
> -	if (dev_priv->psr.psr2_enabled)
> -		enabled = I915_READ(EDP_PSR2_CTL) & EDP_PSR2_ENABLE;
> +	if (psr->enabled)
> +		status = psr->psr2_enabled ? "PSR2 enabled" : "PSR1
> enabled";
>  	else
> -		enabled = I915_READ(EDP_PSR_CTL) & EDP_PSR_ENABLE;
> +		status = "disabled";
> +	seq_printf(m, "PSR mode: %s\n", status);
>  
> -	seq_printf(m, "Main link in standby mode: %s\n",
> -		   yesno(dev_priv->psr.link_standby));
> +	if (!psr->enabled)
> +		goto unlock;
>  
> -	seq_printf(m, "HW Enabled & Active bit: %s\n", yesno(enabled));
> +	if (psr->psr2_enabled) {
> +		val = I915_READ(EDP_PSR2_CTL);
> +		enabled = val & EDP_PSR2_ENABLE;
> +	} else {
> +		val = I915_READ(EDP_PSR_CTL);
> +		enabled = val & EDP_PSR_ENABLE;
> +	}
> +	seq_printf(m, "Source PSR ctl: %s [0x%08x]\n",
> +		   enableddisabled(enabled), val);
> +	psr_source_status(dev_priv, m);
> +	seq_printf(m, "Busy frontbuffer bits: 0x%08x\n",
> +		   psr->busy_frontbuffer_bits);
>  
>  	/*
>  	 * SKL+ Perf counter is reset to 0 everytime DC state is
> entered
>  	 */
The counter is probably still useful for debugging along with
i915.enable_dc = 0, allows us to isolate PSR from DMC. That's something
to explore in the future; this patch lgtm
Reviewed-by: Dhinakaran Pandiyan <dhinakaran.pandiyan@xxxxxxxxx> 

However, I suggest get an ack Rodrigo.


>  	if (IS_HASWELL(dev_priv) || IS_BROADWELL(dev_priv)) {
> -		psrperf = I915_READ(EDP_PSR_PERF_CNT) &
> -			EDP_PSR_PERF_CNT_MASK;
> -
> -		seq_printf(m, "Performance_Counter: %u\n", psrperf);
> +		val = I915_READ(EDP_PSR_PERF_CNT) &
> EDP_PSR_PERF_CNT_MASK;
> +		seq_printf(m, "Performance counter: %u\n", val);
>  	}
>  
> -	psr_source_status(dev_priv, m);
> -	mutex_unlock(&dev_priv->psr.lock);
> -
> -	if (READ_ONCE(dev_priv->psr.debug) & I915_PSR_DEBUG_IRQ) {
> +	if (psr->debug & I915_PSR_DEBUG_IRQ) {
>  		seq_printf(m, "Last attempted entry at: %lld\n",
> -			   dev_priv->psr.last_entry_attempt);
> -		seq_printf(m, "Last exit at: %lld\n",
> -			   dev_priv->psr.last_exit);
> +			   psr->last_entry_attempt);
> +		seq_printf(m, "Last exit at: %lld\n", psr->last_exit);
>  	}
>  
> +unlock:
> +	mutex_unlock(&psr->lock);
>  	intel_runtime_pm_put(dev_priv);
> +
>  	return 0;
>  }
>  

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