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 <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 8c750d5..787c50d 100644
--- a/drivers/gpu/drm/i915/i915_debugfs.c
+++ b/drivers/gpu/drm/i915/i915_debugfs.c
@@ -1816,6 +1816,10 @@
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) {