From: Damien Lespiau <damien.lespiau@intel.com>
Date: Tue, 15 Oct 2013 17:55:33 +0000 (+0100)
Subject: drm/i915: Empty the circular buffer when asked for a new source
X-Git-Tag: v3.13-rc1~76^2~68^2~34
X-Git-Url: https://openfabrics.org/gitweb/?a=commitdiff_plain;h=4b584369c6d6b75c9dbfeeb0896853874d031897;p=~emulex%2Finfiniband.git

drm/i915: Empty the circular buffer when asked for a new source

So we don't read out stale CRCs from a previous run left in the buffer.

Signed-off-by: Damien Lespiau <damien.lespiau@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
---

diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c
index 787c50d194d..ec9151afa24 100644
--- a/drivers/gpu/drm/i915/i915_debugfs.c
+++ b/drivers/gpu/drm/i915/i915_debugfs.c
@@ -1820,6 +1820,12 @@ static int pipe_crc_set_source(struct drm_device *dev, enum pipe pipe,
 	if (pipe_crc->source && source)
 		return -EINVAL;
 
+	/* none -> real source transition */
+	if (source) {
+		atomic_set(&pipe_crc->head, 0);
+		atomic_set(&pipe_crc->tail, 0);
+	}
+
 	pipe_crc->source = source;
 
 	switch (source) {