linux-kernel - Re: [PATCH] drm/nouveau/bios: Use HWSQ entry 1 for PowerBook6,1

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Message-ID: <c50c9c7f569914ef56c2c7bc975f7e46db394c65.camel@aosc.io>
Date:   Tue, 15 Feb 2022 00:31:08 +0800
From:   Icenowy Zheng <icenowy@...c.io>
To:     Ilia Mirkin <imirkin@...m.mit.edu>
Cc:     Ben Skeggs <bskeggs@...hat.com>, David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        nouveau <nouveau@...ts.freedesktop.org>,
        LKML <linux-kernel@...r.kernel.org>,
        dri-devel <dri-devel@...ts.freedesktop.org>
Subject: Re: [PATCH] drm/nouveau/bios: Use HWSQ entry 1 for PowerBook6,1

在 2022-02-14星期一的 11:07 -0500，Ilia Mirkin写道：
> I'm not saying this is wrong, but could you file a bug at
> gitlab.freedesktop.org/drm/nouveau/-/issues and include the VBIOS
> (/sys/kernel/debug/dri/0/vbios.rom)? That would make it easier to
> review the full situation.

Created at https://gitlab.freedesktop.org/drm/nouveau/-/issues/158 .

> 
> On Mon, Feb 14, 2022 at 11:03 AM Icenowy Zheng <icenowy@...c.io> wrote:
> > 
> > On PowerBook6,1 (PowerBook G4 867 12") HWSQ entry 0 (which is
> > currently
> > always used by nouveau) fails, but the BIOS declares 2 HWSQ entries
> > and
> > entry 1 works.
> > 
> > Add a quirk to use HWSQ entry 1.
> > 
> > Signed-off-by: Icenowy Zheng <icenowy@...c.io>
> > ---
> >  drivers/gpu/drm/nouveau/nouveau_bios.c | 7 +++++++
> >  1 file changed, 7 insertions(+)
> > 
> > diff --git a/drivers/gpu/drm/nouveau/nouveau_bios.c
> > b/drivers/gpu/drm/nouveau/nouveau_bios.c
> > index e8c445eb11004..2691d0e0cf9f1 100644
> > --- a/drivers/gpu/drm/nouveau/nouveau_bios.c
> > +++ b/drivers/gpu/drm/nouveau/nouveau_bios.c
> > @@ -1977,6 +1977,13 @@ static int load_nv17_hw_sequencer_ucode(struct
> > drm_device *dev,
> >         if (!hwsq_offset)
> >                 return 0;
> > 
> > +#ifdef __powerpc__
> > +       /* HWSQ entry 0 fails on PowerBook G4 867 12" (Al) */
> > +       if (of_machine_is_compatible("PowerBook6,1"))
> > +               return load_nv17_hwsq_ucode_entry(dev, bios,
> > +                                                 hwsq_offset + sz,
> > 1);
> > +#endif
> > +
> >         /* always use entry 0? */
> >         return load_nv17_hwsq_ucode_entry(dev, bios, hwsq_offset +
> > sz, 0);
> >  }
> > --
> > 2.30.2
> >