[PATCH 06/16] drm/i915: Enforce going back to none before changing CRC source

Damien Lespiau
2013-10-15T17:55:55Z

This way we can have some init/fini code on those transitions.

Signed-off-by: Damien Lespiau <damien.lespiau@intel.com>
---
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) {
--
1.8.3.1