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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>
This commit is contained in:
Damien Lespiau 2013-10-15 18:55:33 +01:00 committed by Daniel Vetter
parent ae676fcd2a
commit 4b584369c6
1 changed files with 6 additions and 0 deletions
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6
drivers/gpu/drm/i915/i915_debugfs.c
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@ -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) {