linux-kernel - Re: [PATCH 2/3] drm/nouveau/kms/nv50-: Report max cursor size to userspace

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Date:   Tue, 23 Feb 2021 16:36:31 +0100
From:   Alex Riesen <alexander.riesen@...itec.com>
To:     Ilia Mirkin <imirkin@...m.mit.edu>
Cc:     Lyude Paul <lyude@...hat.com>,
        Pankaj Bharadiya <pankaj.laxminarayan.bharadiya@...el.com>,
        David Airlie <airlied@...ux.ie>,
        nouveau <nouveau@...ts.freedesktop.org>,
        James Jones <jajones@...dia.com>,
        LKML <linux-kernel@...r.kernel.org>,
        dri-devel <dri-devel@...ts.freedesktop.org>,
        Jeremy Cline <jcline@...hat.com>,
        Ben Skeggs <bskeggs@...hat.com>,
        Dave Airlie <airlied@...hat.com>
Subject: Re: [PATCH 2/3] drm/nouveau/kms/nv50-: Report max cursor size to
 userspace

Ilia Mirkin, Tue, Feb 23, 2021 15:56:21 +0100:
> On Tue, Feb 23, 2021 at 9:26 AM Alex Riesen <alexander.riesen@...itec.com> wrote:
> > Lyude Paul, Tue, Jan 19, 2021 02:54:13 +0100:
> > > diff --git a/drivers/gpu/drm/nouveau/dispnv50/disp.c b/drivers/gpu/drm/nouveau/dispnv50/disp.c
> > > index c6367035970e..5f4f09a601d4 100644
> > > --- a/drivers/gpu/drm/nouveau/dispnv50/disp.c
> > > +++ b/drivers/gpu/drm/nouveau/dispnv50/disp.c
> > > @@ -2663,6 +2663,14 @@ nv50_display_create(struct drm_device *dev)
> > >       else
> > >               nouveau_display(dev)->format_modifiers = disp50xx_modifiers;
> > >
> > > +     if (disp->disp->object.oclass >= GK104_DISP) {
> > > +             dev->mode_config.cursor_width = 256;
> > > +             dev->mode_config.cursor_height = 256;
> > > +     } else {
> > > +             dev->mode_config.cursor_width = 64;
> > > +             dev->mode_config.cursor_height = 64;
> > > +     }
> > > +
> > >       /* create crtc objects to represent the hw heads */
> > >       if (disp->disp->object.oclass >= GV100_DISP)
> > >               crtcs = nvif_rd32(&device->object, 0x610060) & 0xff;
> >
> > This change broke X cursor in my setup, and reverting the commit restores it.
> >
> > Dell Precision M4800, issue ~2014 with GK106GLM [Quadro K2100M] (rev a1).
> > libdrm 2.4.91-1 (Debian 10.8 stable).
> > There are no errors or warnings in Xorg logs nor in the kernel log.
> 
> Could you confirm which ddx is driving the nvidia hw? You can find
> this out by running "xrandr --listproviders", or also in the xorg log.

xrandr(1) does not seem to list much:

$ xrandr --listproviders
Providers: number : 1
Provider 0: id: 0x48 cap: 0xf, Source Output, Sink Output, Source Offload, Sink Offload crtcs: 4 outputs: 5 associated providers: 0 name:modesetting

I failed to find a DDX in Xorg.0.log. Both Xorg.0.log and dmesg can be seen here:

    https://gist.github.com/ar-cetitec/68c27551d9a59b89dc73bffe0456bbef