linux-kernel - Re: [PATCH 20/33] fbdev/sh_mob: Remove fb notifier callback

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Date:   Mon, 20 May 2019 11:19:39 +0200
From:   Daniel Vetter <daniel.vetter@...ll.ch>
To:     Geert Uytterhoeven <geert@...ux-m68k.org>
Cc:     DRI Development <dri-devel@...ts.freedesktop.org>,
        Intel Graphics Development <intel-gfx@...ts.freedesktop.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Daniel Vetter <daniel.vetter@...el.com>,
        Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
        Markus Elfring <elfring@...rs.sourceforge.net>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        Wolfram Sang <wsa+renesas@...g-engineering.com>
Subject: Re: [PATCH 20/33] fbdev/sh_mob: Remove fb notifier callback

On Mon, May 20, 2019 at 11:06 AM Geert Uytterhoeven
<geert@...ux-m68k.org> wrote:
>
> On Mon, May 20, 2019 at 10:22 AM Daniel Vetter <daniel.vetter@...ll.ch> wrote:
> > This seems to be entirely defunct:
> >
> > - The FB_EVEN_SUSPEND/RESUME events are only sent out by
> >   fb_set_suspend. Which is supposed to be called by drivers in their
> >   suspend/resume hooks, and not itself call into drivers. Luckily
> >   sh_mob doesn't call fb_set_suspend, so this seems to do nothing
> >   useful.
> >
> > - The notify hook calls sh_mobile_fb_reconfig() which in turn can
> >   call into the fb notifier. Or attempt too, since that would
> >   deadlock.
> >
> > So looks like leftover hacks from when this was originally introduced
> > in
> >
> > commit 6011bdeaa6089d49c02de69f05980da7bad314ab
> > Author: Guennadi Liakhovetski <g.liakhovetski@....de>
> > Date:   Wed Jul 21 10:13:21 2010 +0000
> >
> >     fbdev: sh-mobile: HDMI support for SH-Mobile SoCs
> >
> > So let's just remove it.
> >
> > Signed-off-by: Daniel Vetter <daniel.vetter@...el.com>
>
> Reviewed-by: Geert Uytterhoeven <geert+renesas@...der.be>
>
> Display still works fine on Armadillo800-EVA, before and after system
> suspend/resume, so:
>
> Tested-by: Geert Uytterhoeven <geert+renesas@...der.be>

I'm impressed, I honestly think I do not fully understand what the
shmob driver is doing here, so thank you very much for giving this a
spin!

Cheers, Daniel

>
> Gr{oetje,eeting}s,
>
>                         Geert
>
> --
> Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org
>
> In personal conversations with technical people, I call myself a hacker. But
> when I'm talking to journalists I just say "programmer" or something like that.
>                                 -- Linus Torvalds



-- 
Daniel Vetter
Software Engineer, Intel Corporation
+41 (0) 79 365 57 48 - http://blog.ffwll.ch