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drm/i915: Empty the circular buffer when asked for a new source
author
Damien Lespiau
<damien.lespiau@intel.com>
Tue, 15 Oct 2013 17:55:33 +0000
(18:55 +0100)
committer
Daniel Vetter
<daniel.vetter@ffwll.ch>
Wed, 16 Oct 2013 11:32:12 +0000
(13:32 +0200)
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>
drivers/gpu/drm/i915/i915_debugfs.c
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diff --git
a/drivers/gpu/drm/i915/i915_debugfs.c
b/drivers/gpu/drm/i915/i915_debugfs.c
index
787c50d
..
ec9151a
100644
(file)
--- 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) {