[PATCH] drm/aspeed: Call drm_fbdev_generic_setup after drm_dev_register

[Joel Stanley]

On Wed, 1 Jul 2020 at 09:10, Sam Ravnborg <sam at ravnborg.org> wrote:
>
> Hi Guenter.
>
> On Tue, Jun 30, 2020 at 05:10:02PM -0700, Guenter Roeck wrote:
> > The following backtrace is seen when running aspeed G5 kernels.
> >
> > WARNING: CPU: 0 PID: 1 at drivers/gpu/drm/drm_fb_helper.c:2233 drm_fbdev_generic_setup+0x138/0x198
> > aspeed_gfx 1e6e6000.display: Device has not been registered.
> > CPU: 0 PID: 1 Comm: swapper/0 Not tainted 5.8.0-rc3 #1
> > Hardware name: Generic DT based system
> > Backtrace:
> > [<8010d6d0>] (dump_backtrace) from [<8010d9b8>] (show_stack+0x20/0x24)
> > r7:00000009 r6:60000153 r5:00000000 r4:8119fa94
> > [<8010d998>] (show_stack) from [<80b8cb98>] (dump_stack+0xcc/0xec)
> > [<80b8cacc>] (dump_stack) from [<80123ef0>] (__warn+0xd8/0xfc)
> > r7:00000009 r6:80e62ed0 r5:00000000 r4:974c3ccc
> > [<80123e18>] (__warn) from [<80123f98>] (warn_slowpath_fmt+0x84/0xc4)
> > r9:00000009 r8:806a0140 r7:000008b9 r6:80e62ed0 r5:80e631f8 r4:974c2000
> > [<80123f18>] (warn_slowpath_fmt) from [<806a0140>] (drm_fbdev_generic_setup+0x138/0x198)
> > r9:00000001 r8:9758fc10 r7:9758fc00 r6:00000000 r5:00000020 r4:9768a000
> > [<806a0008>] (drm_fbdev_generic_setup) from [<806d4558>] (aspeed_gfx_probe+0x204/0x32c)
> > r7:9758fc00 r6:00000000 r5:00000000 r4:9768a000
> > [<806d4354>] (aspeed_gfx_probe) from [<806dfca0>] (platform_drv_probe+0x58/0xa8)
> >
> > Since commit 1aed9509b29a6 ("drm/fb-helper: Remove return value from
> > drm_fbdev_generic_setup()"), drm_fbdev_generic_setup() must be called
> > after drm_dev_register() to avoid the warning. Do that.
> >
> > Fixes: 1aed9509b29a6 ("drm/fb-helper: Remove return value from drm_fbdev_generic_setup()")
> > Signed-off-by: Guenter Roeck <linux at roeck-us.net>
>
> I thought we had this fixed already - but could not find the patch.
> Must have been another driver then.
>
> Acked-by: Sam Ravnborg <sam at ravnborg.org>
>
> I assume Joel Stanley will pick up this patch.

I do not have the drm maintainer tools set up at the moment. Could one
of the other maintainers put this in the drm-misc tree?

Acked-by: Joel Stanley <joel at jms.id.au>

Cheers,

Joel

>
>         Sam
>
> > ---
> >  drivers/gpu/drm/aspeed/aspeed_gfx_drv.c | 3 +--
> >  1 file changed, 1 insertion(+), 2 deletions(-)
> >
> > diff --git a/drivers/gpu/drm/aspeed/aspeed_gfx_drv.c b/drivers/gpu/drm/aspeed/aspeed_gfx_drv.c
> > index 6b27242b9ee3..bca3fcff16ec 100644
> > --- a/drivers/gpu/drm/aspeed/aspeed_gfx_drv.c
> > +++ b/drivers/gpu/drm/aspeed/aspeed_gfx_drv.c
> > @@ -173,8 +173,6 @@ static int aspeed_gfx_load(struct drm_device *drm)
> >
> >       drm_mode_config_reset(drm);
> >
> > -     drm_fbdev_generic_setup(drm, 32);
> > -
> >       return 0;
> >  }
> >
> > @@ -225,6 +223,7 @@ static int aspeed_gfx_probe(struct platform_device *pdev)
> >       if (ret)
> >               goto err_unload;
> >
> > +     drm_fbdev_generic_setup(&priv->drm, 32);
> >       return 0;
> >
> >  err_unload:
> > --
> > 2.17.1
> >
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