Hi,
On 7/28/20 9:58 PM, Laurent Pinchart wrote:
Hi Hans,
Thank you for the patch.
On Tue, Jul 28, 2020 at 01:22:08PM +0200, Hans de Goede wrote:
uvc_ctrl_add_info() calls uvc_ctrl_get_flags() which will override
the fixed-up flags set by uvc_ctrl_fixup_xu_info().
uvc_ctrl_init_xu_ctrl() already calls uvc_ctrl_get_flags() before
calling uvc_ctrl_add_info(), so the uvc_ctrl_get_flags() call in
uvc_ctrl_add_info() is not necessary for xu ctrls.
This commit moves the uvc_ctrl_get_flags() call for normal controls
from uvc_ctrl_add_info() to uvc_ctrl_init_ctrl(), so that we no longer
call uvc_ctrl_get_flags() twice for xu controls and so that we no longer
override the fixed-up flags set by uvc_ctrl_fixup_xu_info().
This fixes the xu motor controls not working properly on a Logitech
046d:08cc, and presumably also on the other Logitech models which have
a quirk for this in the uvc_ctrl_fixup_xu_info() function.
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Hans de Goede <hdegoede@xxxxxxxxxx>
Reviewed-by: Laurent Pinchart <laurent.pinchart@xxxxxxxxxxxxxxxx>
The first patch in this series is a bug-fix for a real-world issue,
and I'm still not seeing this in -next, let alone in a fixed branch for Linus.
Can we get these 2 patches merged please?
Regards,
Hans
---
Changes in v2:
- Move the uvc_ctrl_get_flags() call for normal controls to uvc_ctrl_init_ctrl()
---
drivers/media/usb/uvc/uvc_ctrl.c | 14 +++++++-------
1 file changed, 7 insertions(+), 7 deletions(-)
diff --git a/drivers/media/usb/uvc/uvc_ctrl.c b/drivers/media/usb/uvc/uvc_ctrl.c
index e399b9fad757..b78aba991212 100644
--- a/drivers/media/usb/uvc/uvc_ctrl.c
+++ b/drivers/media/usb/uvc/uvc_ctrl.c
@@ -2024,13 +2024,6 @@ static int uvc_ctrl_add_info(struct uvc_device *dev, struct uvc_control *ctrl,
goto done;
}
- /*
- * Retrieve control flags from the device. Ignore errors and work with
- * default flag values from the uvc_ctrl array when the device doesn't
- * properly implement GET_INFO on standard controls.
- */
- uvc_ctrl_get_flags(dev, ctrl, &ctrl->info);
-
ctrl->initialized = 1;
uvc_trace(UVC_TRACE_CONTROL, "Added control %pUl/%u to device %s "
@@ -2253,6 +2246,13 @@ static void uvc_ctrl_init_ctrl(struct uvc_device *dev, struct uvc_control *ctrl)
if (uvc_entity_match_guid(ctrl->entity, info->entity) &&
ctrl->index == info->index) {
uvc_ctrl_add_info(dev, ctrl, info);
+ /*
+ * Retrieve control flags from the device. Ignore errors
+ * and work with default flag values from the uvc_ctrl
+ * array when the device doesn't properly implement
+ * GET_INFO on standard controls.
+ */
+ uvc_ctrl_get_flags(dev, ctrl, &ctrl->info);
break;
}
}
