[Intel-gfx] [PATCH 15/35] drm/i915: Print the watermark latencies during init

[ville.syrjala at linux.intel.com]

From: Ville Syrjälä <ville.syrjala at linux.intel.com>

Seeing the watermark latency values in dmesg might help sometimes.

Signed-off-by: Ville Syrjälä <ville.syrjala at linux.intel.com>
---
 drivers/gpu/drm/i915/intel_pm.c | 25 +++++++++++++++++++++++++
 1 file changed, 25 insertions(+)

diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
index 37919df..5687957 100644
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -2392,6 +2392,24 @@ static void intel_fixup_cur_wm_latency(struct drm_device *dev, uint16_t wm[5])
 		wm[3] *= 2;
 }
 
+static void intel_print_wm_latency(struct drm_device *dev, const uint16_t wm[5])
+{
+	int level;
+
+	for (level = 0; level <= 4; level++) {
+		unsigned int latency = wm[level];
+
+		if (latency == 0)
+			continue;
+
+		if (level > 0)
+			latency *= 5;
+
+		DRM_DEBUG_KMS(" WM%d latency %u (%u.%u usec)\n",
+			      level, wm[level], latency / 10, latency % 10);
+	}
+}
+
 static void intel_setup_wm_latency(struct drm_device *dev)
 {
 	struct drm_i915_private *dev_priv = dev->dev_private;
@@ -2405,6 +2423,13 @@ static void intel_setup_wm_latency(struct drm_device *dev)
 
 	intel_fixup_spr_wm_latency(dev, dev_priv->wm.spr_latency);
 	intel_fixup_cur_wm_latency(dev, dev_priv->wm.cur_latency);
+
+	DRM_DEBUG_KMS("Primary watermark latencies:\n");
+	intel_print_wm_latency(dev, dev_priv->wm.pri_latency);
+	DRM_DEBUG_KMS("Sprite watermark latencies:\n");
+	intel_print_wm_latency(dev, dev_priv->wm.spr_latency);
+	DRM_DEBUG_KMS("Cursor watermark latencies:\n");
+	intel_print_wm_latency(dev, dev_priv->wm.cur_latency);
 }
 
 static void hsw_compute_wm_parameters(struct drm_device *dev,
-- 
1.8.1.5