lkml.org 
[lkml]   [2021]   [Dec]   [6]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [REGRESSION] Re: [PATCH v10 11/21] media: uvcvideo: Set unique vdev name based in type
Hi Nicolas,

On Mon, Dec 06, 2021 at 02:05:06PM -0500, Nicolas Dufresne wrote:
> Le vendredi 18 juin 2021 à 14:29 +0200, Ricardo Ribalda a écrit :
> > All the entities must have a unique name. We can have a descriptive and
> > unique name by appending the function and the entity->id.
>
> Thanks for your work. The only issue is that unfortunately this change cause an
> important regression for users. All UVC cameras in all UIs seems to no longer
> include any information about the camera. As an example, I have two cameras on
> my system and Firefox, Chrome, Cheese, Zoom and MS Team all agree that my camera
> are now:
>
> Video Capture 4
> Video Capture 5
>
> Previously they would be shown as something like:
>
> StreamCam
> Integrated
>
> We should probably revert this change quickly before it get deployed more
> widely, I have notice the backport being sent for 5.4, 5.10 and 5.14. I'm using
> 5.15 shipped by Fedora team.

Ack.

> As a proper solution, maybe I could suggest to keep using dev->name, but trim it
> enough to fit the " N" string to guaranty that you have enough space in this
> limited 32 char string and use that instead ? This should fit the uniqueness
> requirement without the sacrifice of the only possibly useful information we had
> in that limited string.

That would polute the device name a bit, which isn't very nice for
users. I wonder if we could instead decouple the entity name from the
video device name.

> > This is even resilent to multi chain devices.
> >
> > Fixes v4l2-compliance:
> > Media Controller ioctls:
> > fail: v4l2-test-media.cpp(205): v2_entity_names_set.find(key) != v2_entity_names_set.end()
> > test MEDIA_IOC_G_TOPOLOGY: FAIL
> > fail: v4l2-test-media.cpp(394): num_data_links != num_links
> > test MEDIA_IOC_ENUM_ENTITIES/LINKS: FAIL
> >
> > Signed-off-by: Ricardo Ribalda <ribalda@chromium.org>
> > Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
> > Reviewed-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
> > ---
> > drivers/media/usb/uvc/uvc_driver.c | 7 ++++++-
> > 1 file changed, 6 insertions(+), 1 deletion(-)
> >
> > diff --git a/drivers/media/usb/uvc/uvc_driver.c b/drivers/media/usb/uvc/uvc_driver.c
> > index 14b60792ffab..037bf80d1100 100644
> > --- a/drivers/media/usb/uvc/uvc_driver.c
> > +++ b/drivers/media/usb/uvc/uvc_driver.c
> > @@ -2194,6 +2194,7 @@ int uvc_register_video_device(struct uvc_device *dev,
> > const struct v4l2_file_operations *fops,
> > const struct v4l2_ioctl_ops *ioctl_ops)
> > {
> > + const char *name;
> > int ret;
> >
> > /* Initialize the video buffers queue. */
> > @@ -2222,16 +2223,20 @@ int uvc_register_video_device(struct uvc_device *dev,
> > case V4L2_BUF_TYPE_VIDEO_CAPTURE:
> > default:
> > vdev->device_caps = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_STREAMING;
> > + name = "Video Capture";
> > break;
> > case V4L2_BUF_TYPE_VIDEO_OUTPUT:
> > vdev->device_caps = V4L2_CAP_VIDEO_OUTPUT | V4L2_CAP_STREAMING;
> > + name = "Video Output";
> > break;
> > case V4L2_BUF_TYPE_META_CAPTURE:
> > vdev->device_caps = V4L2_CAP_META_CAPTURE | V4L2_CAP_STREAMING;
> > + name = "Metadata";
> > break;
> > }
> >
> > - strscpy(vdev->name, dev->name, sizeof(vdev->name));
> > + snprintf(vdev->name, sizeof(vdev->name), "%s %u", name,
> > + stream->header.bTerminalLink);
> >
> > /*
> > * Set the driver data before calling video_register_device, otherwise

--
Regards,

Laurent Pinchart

\
 
 \ /
  Last update: 2021-12-06 20:17    [W:0.055 / U:1.336 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site