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 787c50d..ec9151a 100644
--- a/drivers/gpu/drm/i915/i915_debugfs.c
+++ b/drivers/gpu/drm/i915/i915_debugfs.c
@@ -1820,6 +1820,12 @@
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) {