[media] uvcvideo: Fix V4L2 button controls that share the same UVC control

The Logitech pan/tilt reset UVC control contains two V4L2 button
controls to reset pan and tilt. As the UVC control is not marked as
auto-update, the button bits are set but never reset. A pan reset that
follows a tilt reset would thus reset both pan and tilt.

Fix this by not caching the control value of write-only controls. All
standard UVC controls are either readable or auto-update, so this will
not cause any regression and will not result in extra USB requests.

Reported-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Acked-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

1 files changed, 5 insertions, 2 deletions

diff --git a/drivers/media/video/uvc/uvc_ctrl.c b/drivers/media/video/uvc/uvc_ctrl.c
index f3bd66c500b6..af26bbe6f76e 100644
--- a/drivers/media/video/uvc/uvc_ctrl.c
+++ b/drivers/media/video/uvc/uvc_ctrl.c
@@ -1351,9 +1351,12 @@ static int uvc_ctrl_commit_entity(struct uvc_device *dev,
 
                 /* Reset the loaded flag for auto-update controls that were
                  * marked as loaded in uvc_ctrl_get/uvc_ctrl_set to prevent
-                 * uvc_ctrl_get from using the cached value.
+                 * uvc_ctrl_get from using the cached value, and for write-only
+                 * controls to prevent uvc_ctrl_set from setting bits not
+                 * explicitly set by the user.
                  */
-                if (ctrl->info.flags & UVC_CTRL_FLAG_AUTO_UPDATE)
+                if (ctrl->info.flags & UVC_CTRL_FLAG_AUTO_UPDATE ||
+                    !(ctrl->info.flags & UVC_CTRL_FLAG_GET_CUR))
                         ctrl->loaded = 0;
 
                 if (!ctrl->dirty)