drm/i915: Refactor PSR status debugfs

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@intel.com>
Cc: Dhinakaran Pandiyan <dhinakaran.pandiyan@intel.com>
Suggested-by: Dhinakaran Pandiyan <dhinakaran.pandiyan@intel.com>
Reviewed-by: Dhinakaran Pandiyan <dhinakaran.pandiyan@intel.com>
Acked-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Signed-off-by: José Roberto de Souza <jose.souza@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190117205548.28378-2-jose.souza@intel.com

drivers/gpu/drm/i915/i915_debugfs.c

@@ -2506,7 +2506,8 @@ 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[] = {
@@ -2522,14 +2523,11 @@ 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) >>
+		val = I915_READ(EDP_PSR2_STATUS);
+		status_val = (val & 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;
-		}
+		if (status_val < ARRAY_SIZE(live_status))
+			status = live_status[status_val];
 	} else {
 		static const char * const live_status[] = {
 			"IDLE",
@@ -2541,75 +2539,79 @@ 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) >>
+		val = I915_READ(EDP_PSR_STATUS);
+		status_val = (val & 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;
-		}
+		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);
+	struct i915_psr *psr = &dev_priv->psr;
 	intel_wakeref_t wakeref;
-	u32 psrperf = 0;
-	bool enabled = false;
-	bool sink_support;
+	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));
+	if (psr->dp)
+		seq_printf(m, " [0x%02x]", psr->dp->psr_dpcd[0]);
+	seq_puts(m, "\n");
+
+	if (!psr->sink_support)
 		return 0;
 
 	wakeref = 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
 	 */
 	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, wakeref);
+
 	return 0;
 }