Re: [PATCH v2 2/2] powerpc/configs: replace deprecated riva/nvidia with nouveau

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Hi Michael,

On Mon, 18 May 2020 at 08:30, Michael Ellerman <mpe@xxxxxxxxxxxxxx> wrote:
>
> Emil Velikov <emil.l.velikov@xxxxxxxxx> writes:
> > As mentioned in earlier commit, the riva and nvidia fbdev drivers have
> > seen no love over the years, are short on features and overall below par
> >
> > Users are encouraged to switch to the nouveau drm driver instead.
> >
> > v2: Split configs to separate patch, enable nouveau (Bartlomiej)
> >
> > Cc: Antonino Daplas <adaplas@xxxxxxxxx>
> > Cc: Bartlomiej Zolnierkiewicz <b.zolnierkie@xxxxxxxxxxx>
> > Cc: linux-fbdev@xxxxxxxxxxxxxxx
> > Cc: dri-devel@xxxxxxxxxxxxxxxxxxxxx
> > Cc: Michael Ellerman <mpe@xxxxxxxxxxxxxx>
> > Cc: Benjamin Herrenschmidt <benh@xxxxxxxxxxxxxxxxxxx>
> > Cc: Paul Mackerras <paulus@xxxxxxxxx>
> > Cc: linuxppc-dev@xxxxxxxxxxxxxxxx
> > Signed-off-by: Emil Velikov <emil.l.velikov@xxxxxxxxx>
> > Acked-by: Daniel Vetter <daniel.vetter@xxxxxxxx> (v1)
> > ---
> > Hi all unless, there are objections I would prefer to merge this via
> > the drm tree.
>
> Have you tested that the resulting kernels work on the relevant
> hardware?
>
Sadly, no I haven't. I'm updating the defconfigs as requested by the
fbdev maintainer.

> The old drivers may be crufty but they presumably have been tested by
> people and at least somewhat work.
>
> So I'd be inclined to leave the defconfigs alone until someone can test
> that the new driver works at all.
>
Works for me.

> I gave it a quick spin on a G5 I have access to and dmesg has a bunch of
> errors in it (see below). I can't actually tell if the display is
> working because the machine is remote, and I can't go and check it at
> the moment because the office is closed.
>

>From what I can see, there seems to be three bits:
 - attempted out-of-bound attempts to read the vbios
Genuine concern or noise? Likely using the bios from open firmware,
check any of the other options - see NvBios in [1]
 - cannot figure out the timer input frequency
No idea
 - the TV1 EDID is empty
Is there an actual TV connected to the device, check with another cable

Regardless of the patches, reporting [2] the above would be a nice move.

Thanks
Emil
[1] https://nouveau.freedesktop.org/wiki/KernelModuleParameters/
[2] https://gitlab.freedesktop.org/xorg/driver/xf86-video-nouveau/-/issues
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