From: Ondrej Zary <linux@zary.sk>
To: Karol Herbst <kherbst@redhat.com>
Cc: nouveau <nouveau@lists.freedesktop.org>,
dri-devel <dri-devel@lists.freedesktop.org>,
Ben Skeggs <bskeggs@redhat.com>,
LKML <linux-kernel@vger.kernel.org>
Subject: Re: [Nouveau] nouveau broken on Riva TNT2 in 5.9.0-rc8: GPU not supported on big-endian
Date: Wed, 28 Oct 2020 21:15:32 +0100 [thread overview]
Message-ID: <202010282115.32811.linux@zary.sk> (raw)
In-Reply-To: <CACO55tuAxbcXbC9zrT5rs34s=5uBugkbcikORU5868ka9bHdkw@mail.gmail.com>
On Saturday 10 October 2020 02:02:42 Karol Herbst wrote:
> 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.
Any progress with the patch?
--
Ondrej Zary
_______________________________________________
dri-devel mailing list
dri-devel@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/dri-devel
next prev parent reply other threads:[~2020-10-29 8:12 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
2020-10-28 20:15 ` Ondrej Zary [this message]
2020-10-28 21:42 ` Karol Herbst
2020-10-10 8:49 ` Ondrej Zary
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=202010282115.32811.linux@zary.sk \
--to=linux@zary.sk \
--cc=bskeggs@redhat.com \
--cc=dri-devel@lists.freedesktop.org \
--cc=kherbst@redhat.com \
--cc=linux-kernel@vger.kernel.org \
--cc=nouveau@lists.freedesktop.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).