linux-kernel - Re: [PATCH] media/uvcvideo: add quirk for invalid dev

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Date: Mon, 17 Jun 2024 02:37:56 +0300
From: Laurent Pinchart <laurent.pinchart@...asonboard.com>
To: Ricardo Ribalda <ribalda@...omium.org>
Cc: Oleksandr Natalenko <oleksandr@...alenko.name>,
	linux-kernel@...r.kernel.org, linux-media@...r.kernel.org,
	Mauro Carvalho Chehab <mchehab@...nel.org>,
	"hn.chen" <hn.chen@...plusit.com>,
	Hans Verkuil <hverkuil@...all.nl>,
	Sergey Senozhatsky <senozhatsky@...omium.org>
Subject: Re: [PATCH] media/uvcvideo: add quirk for invalid dev_sof in
 Logitech C920

On Thu, Apr 04, 2024 at 08:35:14AM +0200, Ricardo Ribalda wrote:
> On Thu, 4 Apr 2024 at 03:11, Laurent Pinchart wrote:
> > On Mon, Apr 01, 2024 at 06:45:16PM +0200, Oleksandr Natalenko wrote:
> > > On pondělí 25. března 2024 15:26:11, CEST Oleksandr Natalenko wrote:
> > > > Similarly to Logitech C922, C920 seems to also suffer from a firmware
> > > > bug that breaks hardware timestamping.
> > > >
> > > > Add a quirk for this camera model too.
> > > >
> > > > Before applying the quirk:
> > > >
> > > > ```
> > > > 100 (4) [-] none 100 200717 B 212.919114 213.079004 33.727 fps ts mono/SoE
> > > > 101 (5) [-] none 101 200889 B 213.003703 213.114996 11.822 fps ts mono/SoE
> > > > 102 (6) [-] none 102 200926 B 213.035571 213.146999 31.379 fps ts mono/SoE
> > > > 103 (7) [-] none 103 200839 B 213.067424 213.179003 31.394 fps ts mono/SoE
> > > > 104 (0) [-] none 104 200692 B 213.293180 213.214991 4.430 fps ts mono/SoE
> > > > 105 (1) [-] none 105 200937 B 213.322374 213.247001 34.254 fps ts mono/SoE
> > > > 106 (2) [-] none 106 201013 B 213.352228 213.279005 33.496 fps ts mono/SoE
> > > > …
> > > > ```
> > > >
> > > > After applying the quirk:
> > > >
> > > > ```
> > > > 154 (2) [-] none 154 192417 B 42.199823 42.207788 27.779 fps ts mono/SoE
> > > > 155 (3) [-] none 155 192040 B 42.231834 42.239791 31.239 fps ts mono/SoE
> > > > 156 (4) [-] none 156 192213 B 42.263823 42.271822 31.261 fps ts mono/SoE
> > > > 157 (5) [-] none 157 191981 B 42.299824 42.303827 27.777 fps ts mono/SoE
> > > > 158 (6) [-] none 158 191953 B 42.331835 42.339811 31.239 fps ts mono/SoE
> > > > 159 (7) [-] none 159 191904 B 42.363824 42.371813 31.261 fps ts mono/SoE
> > > > 160 (0) [-] none 160 192210 B 42.399834 42.407801 27.770 fps ts mono/SoE
> > > > ```
> > > >
> > > > Link: https://lore.kernel.org/lkml/5764213.DvuYhMxLoT@natalenko.name/
> > > > Reviewed-by: Ricardo Ribalda <ribalda@...omium.org>
> > > > Signed-off-by: Oleksandr Natalenko <oleksandr@...alenko.name>
> > > > ---
> > > >  drivers/media/usb/uvc/uvc_driver.c | 3 ++-
> > > >  1 file changed, 2 insertions(+), 1 deletion(-)
> > > >
> > > > diff --git a/drivers/media/usb/uvc/uvc_driver.c b/drivers/media/usb/uvc/uvc_driver.c
> > > > index 723e6d5680c2e..444d7089885ea 100644
> > > > --- a/drivers/media/usb/uvc/uvc_driver.c
> > > > +++ b/drivers/media/usb/uvc/uvc_driver.c
> > > > @@ -2573,7 +2573,8 @@ static const struct usb_device_id uvc_ids[] = {
> > > >       .bInterfaceClass      = USB_CLASS_VIDEO,
> > > >       .bInterfaceSubClass   = 1,
> > > >       .bInterfaceProtocol   = 0,
> > > > -     .driver_info          = UVC_INFO_QUIRK(UVC_QUIRK_RESTORE_CTRLS_ON_INIT) },
> > > > +     .driver_info          = UVC_INFO_QUIRK(UVC_QUIRK_RESTORE_CTRLS_ON_INIT
> > > > +                                          | UVC_QUIRK_INVALID_DEVICE_SOF) },
> > > >     /* Logitech HD Pro Webcam C922 */
> > > >     { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
> > > >                             | USB_DEVICE_ID_MATCH_INT_INFO,
> > > >
> > >
> > > Gentle ping on this one.
> >
> > Ricardo, could you include this in the next version of your hw timestamp
> > series ?
> 
> There are no outstanding comments on the series
> https://patchwork.linuxtv.org/project/linux-media/list/?series=12485
> 
> Do you need me to send a v11 with this patch? or you can take that
> directly from your tree?

Reviewed-by: Laurent Pinchart <laurent.pinchart@...asonboard.com>

and taken in my tree.

> > > Also, should I have added:
> > >
> > > Fixes: 5d0fd3c806b9 ("[media] uvcvideo: Disable hardware timestamps by default")
> > >
> > > ?
> >
> > I don't think that's needed, no.
> >
> > > (it's not that this change re-enables HW timestamping, but
> > > 5d0fd3c806b9 explicitly mentions C920 as affected)

-- 
Regards,

Laurent Pinchart