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[10/50] drm/i915: Empty the circular buffer when asked for a new source

Message ID 1407203579-24841-11-git-send-email-dheerajx.s.jamwal@intel.com (mailing list archive)
State New, archived
Headers show

Commit Message

Dheeraj Jamwal Aug. 5, 2014, 1:52 a.m. UTC 
From: Damien Lespiau <damien.lespiau@intel.com>

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>
(cherry picked from commit 4b584369c6d6b75c9dbfeeb0896853874d031897)

Signed-off-by: Dheeraj Jamwal <dheerajx.s.jamwal@intel.com>
---
 drivers/gpu/drm/i915/i915_debugfs.c |    6 ++++++
 1 file changed, 6 insertions(+)
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Patch

diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c
index 787c50d..ec9151a 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) {