From: Karol Herbst <kherbst@redhat.com>
To: Ilia Mirkin <imirkin@alum.mit.edu>
Cc: nouveau <nouveau@lists.freedesktop.org>,
LKML <linux-kernel@vger.kernel.org>,
Ben Skeggs <bskeggs@redhat.com>,
dri-devel <dri-devel@lists.freedesktop.org>,
Ondrej Zary <linux@zary.sk>
Subject: Re: [Nouveau] nouveau broken on Riva TNT2 in 5.9.0-rc8: GPU not supported on big-endian
Date: Sat, 10 Oct 2020 02:02:42 +0200 [thread overview]
Message-ID: <CACO55tuAxbcXbC9zrT5rs34s=5uBugkbcikORU5868ka9bHdkw@mail.gmail.com> (raw)
In-Reply-To: <CAKb7UvggVn2c=jUNSfjf6r529n89xfNgVBpn3jnXznVh8Gs4+w@mail.gmail.com>
On Sat, Oct 10, 2020 at 12:23 AM Ilia Mirkin <imirkin@alum.mit.edu> wrote:
>
> On Fri, Oct 9, 2020 at 5:54 PM Karol Herbst <kherbst@redhat.com> wrote:
> >
> > On Fri, Oct 9, 2020 at 11:35 PM Ondrej Zary <linux@zary.sk> wrote:
> > >
> > > Hello,
> > > I'm testing 5.9.0-rc8 and found that Riva TNT2 stopped working:
> > > [ 0.000000] Linux version 5.9.0-rc8+ (zary@gsql) (gcc (Debian 8.3.0-6) 8.3.0, GNU ld (GNU Binutils for Debian) 2.31.1) #326 SMP Fri Oct 9 22:31:40 CEST 2020
> > > ...
> > > [ 14.771464] nouveau 0000:01:00.0: GPU not supported on big-endian
> > > [ 14.771782] nouveau: probe of 0000:01:00.0 failed with error -38
> > >
> > > big-endian? WTF? The machine is x86.
> > >
> >
> > mhh, we reworked the endianess checks a bit and apparently that broke
> > something... I will give it some thoughts, but could you be so kind
> > and create an mmiotrace under 5.9 with nouveau? You won't need to
> > start X or anything while doing it. Just enable the trace and modprobe
> > nouveau and collect the trace.
>
> Looks like nvkm_device_endianness unconditionally reads out 0x4. I
> don't think that reg is there pre-NV11. At least NV4, NV5, NV10 and
> maybe NV15 (which is logically pre-NV11) don't support big-endian
> mode. Not sure about NV1A, which was the IGP of the series and IIRC
> logically pre-NV11 as well (but clearly could only be used with x86
> chips, since it was part of the motherboard).
>
> Aha, it's documented in rnndb:
>
> https://github.com/envytools/envytools/blob/master/rnndb/bus/pmc.xml
> <reg32 offset="0x004" name="ENDIAN" variants="NV1A-"/>
>
ohh, I should have checked there.. yeah, will write a fix for it then.
Before my patch we just always tried to switch it, but never threw an
error.
> -ilia
>
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next prev parent reply other threads:[~2020-10-10 0:03 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-10-09 21:26 nouveau broken on Riva TNT2 in 5.9.0-rc8: GPU not supported on big-endian Ondrej Zary
2020-10-09 21:53 ` [Nouveau] " Karol Herbst
2020-10-09 22:23 ` Ilia Mirkin
2020-10-10 0:02 ` Karol Herbst [this message]
2020-10-28 20:15 ` Ondrej Zary
2020-10-28 21:42 ` Karol Herbst
2020-10-10 8:49 ` Ondrej Zary
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