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| author | Antonio Ospite <ao2@ao2.it> | 2015-10-14 15:57:32 +0200 |
|---|---|---|
| committer | Mauro Carvalho Chehab <mchehab@osg.samsung.com> | 2015-10-20 19:58:29 +0200 |
| commit | 759b26a1d916400a1a20948eb964dea6ad0bd9e9 (patch) | |
| tree | 438e78da0258039672f4fb6ec75215104d24e482 /drivers/media | |
| parent | [media] DocBook media: Fix a typo in encoder cmd (diff) | |
| download | linux-759b26a1d916400a1a20948eb964dea6ad0bd9e9.tar.xz linux-759b26a1d916400a1a20948eb964dea6ad0bd9e9.zip | |
[media] media/v4l2-ctrls: fix setting autocluster to manual with VIDIOC_S_CTRL
Since commit 5d0360a4f027576e5419d4a7c711c9ca0f1be8ca it's not possible
anymore to set auto clusters from auto to manual using VIDIOC_S_CTRL.
For example, setting autogain to manual with gspca/ov534 driver and this
sequence of commands does not work:
v4l2-ctl --set-ctrl=gain_automatic=1
v4l2-ctl --list-ctrls | grep gain_automatic
# The following does not work
v4l2-ctl --set-ctrl=gain_automatic=0
v4l2-ctl --list-ctrls | grep gain_automatic
Changing the value using VIDIOC_S_EXT_CTRLS (like qv4l2 does) works
fine.
The apparent cause by looking at the changes in 5d0360a and comparing
with the code path for VIDIOC_S_EXT_CTRLS seems to be that the code in
v4l2-ctrls.c::set_ctrl() is not calling user_to_new() anymore after
calling update_from_auto_cluster(master).
However the root cause of the problem is that calling
update_from_auto_cluster(master) overrides also the _master_ control
state calling cur_to_new() while it was supposed to only update the
volatile controls.
Calling user_to_new() after update_from_auto_cluster(master) was just
masking the original bug by restoring the correct new value of the
master control before making the changes permanent.
Fix the original bug by making update_from_auto_cluster() not override
the new master control value.
Signed-off-by: Antonio Ospite <ao2@ao2.it>
Cc: <stable@vger.kernel.org> # for v3.17 and up
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
Diffstat (limited to 'drivers/media')
| -rw-r--r-- | drivers/media/v4l2-core/v4l2-ctrls.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/media/v4l2-core/v4l2-ctrls.c b/drivers/media/v4l2-core/v4l2-ctrls.c index a89b94601b90..4a1d9fdd14bb 100644 --- a/drivers/media/v4l2-core/v4l2-ctrls.c +++ b/drivers/media/v4l2-core/v4l2-ctrls.c @@ -3045,7 +3045,7 @@ static void update_from_auto_cluster(struct v4l2_ctrl *master) { int i; - for (i = 0; i < master->ncontrols; i++) + for (i = 1; i < master->ncontrols; i++) cur_to_new(master->cluster[i]); if (!call_op(master, g_volatile_ctrl)) for (i = 1; i < master->ncontrols; i++) |