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

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Date:   Mon, 20 May 2019 11:05:57 +0200
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Daniel Vetter <daniel.vetter@...ll.ch>
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 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>

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