From ae676fcd2a93bf1809cddbd79e37b37609791dc2 Mon Sep 17 00:00:00 2001 From: Damien Lespiau Date: Tue, 15 Oct 2013 18:55:32 +0100 Subject: [PATCH] drm/i915: Enforce going back to none before changing CRC source This way we can have some init/fini code on those transitions. Signed-off-by: Damien Lespiau Signed-off-by: Daniel Vetter --- drivers/gpu/drm/i915/i915_debugfs.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c index 8c750d5..787c50d 100644 --- a/drivers/gpu/drm/i915/i915_debugfs.c +++ b/drivers/gpu/drm/i915/i915_debugfs.c @@ -1816,6 +1816,10 @@ static int pipe_crc_set_source(struct drm_device *dev, enum pipe pipe, if (pipe_crc->source == source) return 0; + /* forbid changing the source without going back to 'none' */ + if (pipe_crc->source && source) + return -EINVAL; + pipe_crc->source = source; switch (source) { -- 2.7.4