linux-kernel - Re: Linux Kernel 5.2.8 (uvc or i915? <<<)

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Message-ID: <20190816095845.GC5020@pendragon.ideasonboard.com>
Date:   Fri, 16 Aug 2019 12:58:45 +0300
From:   Laurent Pinchart <laurent.pinchart@...asonboard.com>
To:     Randy Dunlap <rdunlap@...radead.org>
Cc:     Nathaniel Russell <naterussell83@...il.com>,
        LKML <linux-kernel@...r.kernel.org>,
        linux-media <linux-media@...r.kernel.org>,
        dri-devel <dri-devel@...ts.freedesktop.org>,
        intel-gfx <intel-gfx@...ts.freedesktop.org>
Subject: Re: Linux Kernel 5.2.8 (uvc or i915? <<<)

Hi Randy,

On Thu, Aug 15, 2019 at 08:10:03PM -0700, Randy Dunlap wrote:
> [adding mailing lists etc. with Nathaniel's test info]
> 
> On 8/15/19 7:21 PM, Nathaniel Russell wrote:
> > Well i surpressed the uvcvideo driver and you are right Randy it
> > definitely is not the uvcvideo driver. There is something going on in
> > the i915 driver.
> > 
> > On 8/15/19, Randy Dunlap <rdunlap@...radead.org> wrote:
> >> On 8/15/19 6:15 PM, Nathaniel Russell wrote:
> >>> I would really like help with the kernel error with my uvcvideo driver.
> >>
> >> Hi again.
> >>
> >> What makes you think that the problem is related to the uvcvideo driver?
> >> Does some previous kernel version work correctly?  If so, what version(s)?
> >>
> >>
> >> Does this warning message only happen when the uvcvideo driver is being
> >> loaded?
> >> Can you suppress loading of the uvcvideo driver to find out?
> >>
> >> Most of the problems/errors/warnings that I see are related to the i915
> >> driver:
> >>
> >> [   13.032341] timed out waiting for port C ready: got 0x20, expected 0xe0
> >> [   13.032872] WARNING: CPU: 1 PID: 239 at
> >> drivers/gpu/drm/i915/intel_display.c:1597 vlv_wait_port_ready+0x99/0xe0
> >> [i915]
> >> [   13.033632] RIP: 0010:vlv_wait_port_ready+0x99/0xe0 [i915]
> >>
> >> although there are a few uvcvideo warnings:
> >> [   13.039305] uvcvideo 1-5:1.0: Entity type for entity Extension 4 was not
> >> initialized!
> >> [   13.039318] uvcvideo 1-5:1.0: Entity type for entity Extension 3 was not
> >> initialized!
> >> [   13.039330] uvcvideo 1-5:1.0: Entity type for entity Processing 2 was not
> >> initialized!
> >> [   13.039339] uvcvideo 1-5:1.0: Entity type for entity Camera 1 was not
> >> initialized!
> >>
> >> Laurent, do you see any uvc issues here?  Any ideas/suggestions?

No, uvcvideo seems completely reunlated.

> >> @intel-gfx:  any ideas about what is going on here with the i915 driver?
> >>
> >> Original message to lkml:
> >> https://lore.kernel.org/lkml/CAONH+Jm-O6=DQ+K2n5pNTNMg2Sq1KcVNFLuweVh6W82OPEFJoQ@mail.gmail.com/T/#u
> >>
> >> Previous message for 5.1.21 kernel:
> >> https://lore.kernel.org/lkml/CAONH+JkTFujY9vEyNNuem+9rJ2qBKkf-PbKk9=DBSVEp6kW=yw@mail.gmail.com/

-- 
Regards,

Laurent Pinchart