Hi Laurent On Thu, Mar 11, 2021 at 4:59 PM Laurent Pinchart <laurent.pinch...@ideasonboard.com> wrote: > > Hi Ricardo, > > Thank you for the patch. > > On Thu, Mar 11, 2021 at 03:08:22PM +0100, Ricardo Ribalda wrote: > > As discussed in the IRC with Hans > > > > We need to specify in the commit message that this is most likely due > > to hw error. > > > > On Thu, Mar 11, 2021 at 1:20 PM Ricardo Ribalda <riba...@chromium.org> > > wrote: > > > > > > Fixes v4l2-compliance: > > > > > > Control ioctls (Input 0): > > > fail: v4l2-test-controls.cpp(448): s_ctrl returned an > > > error (22) > > > test VIDIOC_G/S_CTRL: FAIL > > > fail: v4l2-test-controls.cpp(698): s_ext_ctrls returned > > > an error (22) > > > test VIDIOC_G/S/TRY_EXT_CTRLS: FAIL > > As this isn't supposed to happen, how do you reproduce this ?
Just run v4l2-compliance in my notebook camera. > > > > Signed-off-by: Ricardo Ribalda <riba...@chromium.org> > > > --- > > > drivers/media/usb/uvc/uvc_video.c | 2 +- > > > 1 file changed, 1 insertion(+), 1 deletion(-) > > > > > > diff --git a/drivers/media/usb/uvc/uvc_video.c > > > b/drivers/media/usb/uvc/uvc_video.c > > > index f2f565281e63..5442e9be1c55 100644 > > > --- a/drivers/media/usb/uvc/uvc_video.c > > > +++ b/drivers/media/usb/uvc/uvc_video.c > > > @@ -113,7 +113,7 @@ int uvc_query_ctrl(struct uvc_device *dev, u8 query, > > > u8 unit, > > > case 6: /* Invalid control */ > > > case 7: /* Invalid Request */ > > For cases 5-7 I think -EIO is fine, as the driver should really not call > this function with an invalid unit, control or request. If it does, it's > a bug in the driver (we can check the units and controls the device > claims to support, and the requests are defined by the UVC > specification), if it doesn't and the device still returns this error, > it's a bug on the device side. > > > > case 8: /* Invalid value within range */ > > For this case, however, isn't it valid for a device to return an error > if the control value isn't valid ? There's one particular code path I'm > concerned about, uvc_ioctl_default(UVCIOC_CTRL_QUERY) -> > uvc_xu_ctrl_query() -> uvc_query_ctrl(), where it could be useful for > userspace to know that the value it sets isn't valid. > Will fix in v2 Thanks! > > > - return -EINVAL; > > > + return -EIO; > > > default: /* reserved or unknown */ > > > break; > > > } > > -- > Regards, > > Laurent Pinchart -- Ricardo Ribalda
