linux-kernel - Re: [PATCH] video: logo: LOGO should depend on FB

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Message-ID: <49530f25-8b3b-7dd7-d634-3807bdaaf55b@suse.de>
Date:   Wed, 26 Jul 2023 17:51:10 +0200
From:   Thomas Zimmermann <tzimmermann@...e.de>
To:     Javier Martinez Canillas <javierm@...hat.com>,
        Geert Uytterhoeven <geert@...ux-m68k.org>
Cc:     Helge Deller <deller@....de>, Arnd Bergmann <arnd@...db.de>,
        linux-fbdev@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] video: logo: LOGO should depend on FB_CORE i.s.o. FB

Hi Javier

Am 25.07.23 um 21:53 schrieb Javier Martinez Canillas:
> Thomas Zimmermann <tzimmermann@...e.de> writes:
> 
>> Hi
>>
> 
> [...]
> 
>>>
>>> Yes. I meant to move drivers/video/logo/ to drivers/fbdev/core/logo and to
>>> source its Kconfig from drivers/fbdev/core/Kconfig, since it now depends
>>> on FB_CORE.
>>
>> No, please rather leave it where it is. There's no code dependencies to
>> the fbdev core; it merely depends on the Kconfig token.
>>
> 
> Sure, fine by me. But I disagree that there's merely a Kconfig dependency.
> The include/linux/linux_logo.h header declares both fb_find_logo() and
> fb_append_extra_logo().
> 
> The fb_find_logo() function is defined in drivers/video/logo.c while the
> fb_append_extra_logo() is in drivers/video/fbdev/core/fbmem.c, even though
> only arch/powerpc/platforms/cell/spu_base.c uses fb_append_extra_logo().
> 
> So there's a relationship already between logo and fbdev/core, that's why
> I wondered if would make sense to also move drivers/video/logo.c to have
> both functions in there.

Fair enough. I was looking for references to struct fb_info in the logo 
code and found none. Sam's suggestion to move the remaining code from 
fbdev to logo/ might be the way to go.

If we ever get that DRM boot-up client, it might want to use the logo as 
well. Hence, it needs to be unrelated to fbdev.

Best regards
Thomas

> 
> Yes, as noted drivers/video/console/newport_con.c also uses fb_find_logo()
> but the only other user of that in drivers/video/fbdev/core/fbmem.c.
> 

-- 
Thomas Zimmermann
Graphics Driver Developer
SUSE Software Solutions Germany GmbH
Frankenstrasse 146, 90461 Nuernberg, Germany
GF: Ivo Totev, Andrew Myers, Andrew McDonald, Boudien Moerman
HRB 36809 (AG Nuernberg)

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