linux-kernel - Re: [PATCH v2 3/6] media: uvcvideo: Return -EIO for control errors

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Date:   Fri, 12 Mar 2021 01:30:13 +0200
From:   Laurent Pinchart <laurent.pinchart@...asonboard.com>
To:     Ricardo Ribalda Delgado <ricardo.ribalda@...il.com>
Cc:     Ricardo Ribalda <ribalda@...omium.org>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Tomasz Figa <tfiga@...omium.org>,
        linux-media <linux-media@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Sergey Senozhatsky <senozhatsky@...omium.org>,
        Hans Verkuil <hverkuil@...all.nl>
Subject: Re: [PATCH v2 3/6] media: uvcvideo: Return -EIO for control errors

Hi Ricardo,

On Thu, Mar 11, 2021 at 11:59:27PM +0100, Ricardo Ribalda Delgado wrote:
> On Thu, Mar 11, 2021 at 11:53 PM Laurent Pinchart wrote:
> > On Thu, Mar 11, 2021 at 11:19:43PM +0100, Ricardo Ribalda wrote:
> > > The device is doing something unspected with the control. Either because
> > > the protocol is not properly implemented or there has been a HW error.
> > >
> > > 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
> > >
> > > Signed-off-by: Ricardo Ribalda <ribalda@...omium.org>
> >
> > The change looks good to me.
> >
> > Reviewed-by: Laurent Pinchart <laurent.pinchart@...asonboard.com>
> >
> > Which of the error codes below do you get with your camera, and for
> > which control ?
> 
> Bus 001 Device 003: ID 05c8:03a2 Cheng Uei Precision Industry Co., Ltd
> (Foxlink) XiaoMi USB 2.0 Webcam
> 
> info: checking extended control 'White Balance Temperature' (0x0098091a)
> Control error 7
> info: checking extended control 'Exposure (Absolute)' (0x009a0902)
> Control error 6

:-S And what's the request (GET_CUR, GET_INFO, ...) ?

> > > ---
> > >  drivers/media/usb/uvc/uvc_video.c | 5 +++++
> > >  1 file changed, 5 insertions(+)
> > >
> > > diff --git a/drivers/media/usb/uvc/uvc_video.c b/drivers/media/usb/uvc/uvc_video.c
> > > index f2f565281e63..25fd8aa23529 100644
> > > --- a/drivers/media/usb/uvc/uvc_video.c
> > > +++ b/drivers/media/usb/uvc/uvc_video.c
> > > @@ -112,6 +112,11 @@ int uvc_query_ctrl(struct uvc_device *dev, u8 query, u8 unit,
> > >       case 5: /* Invalid unit */
> > >       case 6: /* Invalid control */
> > >       case 7: /* Invalid Request */
> > > +             /*
> > > +              * The firmware has not properly implemented
> > > +              * the control or there has been a HW error.
> > > +              */
> > > +             return -EIO;
> > >       case 8: /* Invalid value within range */
> > >               return -EINVAL;
> > >       default: /* reserved or unknown */

-- 
Regards,

Laurent Pinchart