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Date:   Thu, 25 Feb 2021 18:07:26 +0100
From:   Pavel Machek <pavel@ucw.cz>
To:     Thomas Zimmermann <tzimmermann@suse.de>
Cc:     intel-gfx@lists.freedesktop.org,
        kernel list <linux-kernel@vger.kernel.org>,
        dri-devel@lists.freedesktop.org, rodrigo.vivi@intel.com,
        airlied@redhat.com, sean@poorly.run
Subject: Re: udldrm does not recover from powersave? Re: udldrmfb: causes
 WARN in i915 on X60 (x86-32)
Message-ID: <20210225170726.GA31110@duo.ucw.cz>
References: <20210224200912.GA27905@duo.ucw.cz>
 <452585d5-9d18-f5a8-9d6b-6d39aa037480@suse.de>
 <20210225095322.GA5089@amd>
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Hi!

> > > > This is in -next, but I get same behaviour on 5.11; and no, udl does
> > >=20
> > > Thanks for reporting. We are in the process of fixing the issue. The =
latest
> > > patch is at [1].
> > >=20
> >=20
> > Thank you, that fixes the DMA issue, and I can use the udl.
> >=20
> > ...for a while. Then screensaver blanks laptop screen, udl screen
> > blanks too. Upon hitting a key, internal screen shows up, udl does
> > not.
> >=20
> > I try rerunning xrandr ... --auto, but could not recover it.
> >=20
> > Any ideas?
>=20
> Did it work before the regression?
>=20
> For testing, could you please remove the fix and then do
>=20
>   git revert 6eb0233ec2d0
>=20
> This would restore the old version. Please report back on the
> results.

Ok, I went to 7f206cf3ec2b with 6eb0233ec2d0 reverted. That fails to
build:

drivers/usb/core/message.c: In function =E2=80=98usb_set_configuration=E2=
=80=99:
drivers/usb/core/message.c:2100:12: error: =E2=80=98struct device=E2=80=99 =
has no member named =E2=80=98dma_pfn_offset=E2=80=99
 2100 |   intf->dev.dma_pfn_offset =3D dev->dev.dma_pfn_offset;
      |            ^
drivers/usb/core/message.c:2100:38: error: =E2=80=98struct device=E2=80=99 =
has no member named =E2=80=98dma_pfn_offset=E2=80=99
 2100 |   intf->dev.dma_pfn_offset =3D dev->dev.dma_pfn_offset;
      |                                      ^
  CC      drivers/net/ethernet/intel/e1000e/param.o
make[3]: *** [scripts/Makefile.build:271: drivers/usb/core/message.o]
Error 1

So I tried to go to bad commit's parent:

git checkout 6eb0233ec2d0^
git log
commit cf141ae989e2ff119cd320326da5923b480d1641
    ARM/keystone: move the DMA offset handling under ifdef CONFIG_ARM_LPAE

But that resulted in lockup soon after "--setprovidersource" command
was isued.

Best regards,
									Pavel

--=20
http://www.livejournal.com/~pavelmachek

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