From: Ville Syrj?l? <ville.syrjala at linux.intel.com>
Print how long watermark programming took. Seems to be ~5 usec on ILK
and IVB at the moment.
---
drivers/gpu/drm/i915/intel_pm.c | 11 +++++++++++
1 file changed, 11 insertions(+)
diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
index 782c644..1e49c94 100644
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -2601,15 +2601,26 @@ void ilk_update_pipe_wm(struct drm_device *dev, enum pipe pipe)
spin_lock_irqsave(&dev_priv->wm.lock, flags);
if (intel_crtc->wm.dirty) {
+ ktime_t stime, etime;
+ s64 duration_ns;
+
DRM_DEBUG_KMS("pipe %c vblank, programming new watermarks\n",
pipe_name(pipe));
+ stime = ktime_get();
+
drm_vblank_put(dev, pipe);
intel_crtc->wm.active = intel_crtc->wm.pending;
intel_crtc->wm.dirty = false;
ilk_program_watermarks(dev);
+
+ etime = ktime_get();
+
+ duration_ns = ktime_to_ns(etime) - ktime_to_ns(stime);
+ DRM_ERROR("pipe %c watermark programming took %lld ns\n",
+ pipe_name(pipe), duration_ns);
}
spin_unlock_irqrestore(&dev_priv->wm.lock, flags);
--
1.8.1.5
