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authorHans Verkuil <hans.verkuil@cisco.com>2014-01-17 15:25:26 +0400
committerMauro Carvalho Chehab <m.chehab@samsung.com>2014-07-17 18:57:16 +0400
commit9ea1b7a4b66fddfab9e65e243b72d18371f8d9a5 (patch)
treefd8a4887e9fafdd171cb734430511e5a67bf2844 /include/media/v4l2-ctrls.h
parent000e4f9a5bcf86fb52914c445ce5634b65e910a2 (diff)
downloadlinux-9ea1b7a4b66fddfab9e65e243b72d18371f8d9a5.tar.xz
[media] v4l2-ctrls: compare values only once
When setting a control the control's new value is compared to the current value twice: once by new_to_cur(), once by cluster_changed(). Not a big deal when dealing with simple values, but it can be a problem when dealing with compound types or arrays. So fix this: cluster_changed() sets the has_changed flag, which is used by new_to_cur() instead of having to do another compare. Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com> Reviewed-by: Sylwester Nawrocki <s.nawrocki@samsung.com> Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>
Diffstat (limited to 'include/media/v4l2-ctrls.h')
-rw-r--r--include/media/v4l2-ctrls.h3
1 files changed, 3 insertions, 0 deletions
diff --git a/include/media/v4l2-ctrls.h b/include/media/v4l2-ctrls.h
index ddd9fdf1ac1a..a38bd55909b2 100644
--- a/include/media/v4l2-ctrls.h
+++ b/include/media/v4l2-ctrls.h
@@ -96,6 +96,8 @@ typedef void (*v4l2_ctrl_notify_fnc)(struct v4l2_ctrl *ctrl, void *priv);
* @is_new: Set when the user specified a new value for this control. It
* is also set when called from v4l2_ctrl_handler_setup. Drivers
* should never set this flag.
+ * @has_changed: Set when the current value differs from the new value. Drivers
+ * should never use this flag.
* @is_private: If set, then this control is private to its handler and it
* will not be added to any other handlers. Drivers can set
* this flag.
@@ -158,6 +160,7 @@ struct v4l2_ctrl {
unsigned int done:1;
unsigned int is_new:1;
+ unsigned int has_changed:1;
unsigned int is_private:1;
unsigned int is_auto:1;
unsigned int is_int:1;