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

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Message-ID: <CAPybu_2GF96ODzrkycAixiRg+L_BMCF40uW5jBhErND8v6STjA@mail.gmail.com>
Date:   Thu, 11 Mar 2021 23:59:27 +0100
From:   Ricardo Ribalda Delgado <ricardo.ribalda@...il.com>
To:     Laurent Pinchart <laurent.pinchart@...asonboard.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 Laurent

On Thu, Mar 11, 2021 at 11:53 PM Laurent Pinchart
<laurent.pinchart@...asonboard.com> wrote:
>
> Hi Ricardo,
>
> Thank you for the patch.

Thank you :)
>
> 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


>
> > ---
> >  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



-- 
Ricardo Ribalda