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media: uvcvideo: Add more logging to uvc_query_ctrl()

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If we fail to query the control error code there is no information on
dmesg or in uvc_dbg. This makes difficult to debug the issue.

Print a proper error message when we cannot retrieve the error code from
the device.

Reviewed-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Ricardo Ribalda <ribalda@chromium.org>
Link: https://lore.kernel.org/r/20241128-uvc-readless-v5-2-cf16ed282af8@chromium.org
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
This commit is contained in:
Ricardo Ribalda 2024-11-28 20:53:42 +00:00 committed by Mauro Carvalho Chehab
parent f00ee2ca8d
commit 060950f7f7
1 changed files with 5 additions and 1 deletions
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6
drivers/media/usb/uvc/uvc_video.c
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@ -117,8 +117,12 @@ int uvc_query_ctrl(struct uvc_device *dev, u8 query, u8 unit,
error = *(u8 *)data;
*(u8 *)data = tmp;
if (ret != 1)
if (ret != 1) {
dev_err_ratelimited(&dev->udev->dev,
"Failed to query (%s) UVC error code control %u on unit %u: %d (exp. 1).\n",
uvc_query_name(query), cs, unit, ret);
return ret < 0 ? ret : -EPIPE;
}
uvc_dbg(dev, CONTROL, "Control error %u\n", error);