From 4b584369c6d6b75c9dbfeeb0896853874d031897 Mon Sep 17 00:00:00 2001 From: Damien Lespiau Date: Tue, 15 Oct 2013 18:55:33 +0100 Subject: [PATCH] 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 Signed-off-by: Daniel Vetter --- drivers/gpu/drm/i915/i915_debugfs.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c index 787c50d194d4..ec9151afa240 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) { -- 2.20.1