linux-kernel - Re: [PATCH v2 5/5] fbdev: Define framebuffer I/O from Linux' I/O functions

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Date:   Fri, 28 Apr 2023 15:10:57 +0200
From:   Thomas Zimmermann <tzimmermann@...e.de>
To:     Geert Uytterhoeven <geert@...ux-m68k.org>,
        Robin Murphy <robin.murphy@....com>
Cc:     linux-fbdev@...r.kernel.org, linux-ia64@...r.kernel.org,
        dri-devel@...ts.freedesktop.org,
        James.Bottomley@...senpartnership.com, sparclinux@...r.kernel.org,
        kernel@...0n.name, sam@...nborg.org, linux-arch@...r.kernel.org,
        deller@....de, chenhuacai@...nel.org, javierm@...hat.com,
        vgupta@...nel.org, linux-snps-arc@...ts.infradead.org,
        arnd@...db.de, linux-m68k@...ts.linux-m68k.org,
        loongarch@...ts.linux.dev, linux-arm-kernel@...ts.infradead.org,
        linux-parisc@...r.kernel.org, linux-kernel@...r.kernel.org,
        davem@...emloft.net
Subject: Re: [PATCH v2 5/5] fbdev: Define framebuffer I/O from Linux' I/O
 functions

Hi

Am 28.04.23 um 14:27 schrieb Geert Uytterhoeven:
[...]
> 
> In addition, the non-raw variants may do some extras to guarantee
> ordering, which you do not need on a frame buffer.

Given this comment, should we declare the fb_() helpers in 
<asm-generic/io.h> or <linux/io.h>?

I still don't like the idea of having the functions in <linux/fb.h>. We 
have code in DRM that also accesses framebuffer memory (via 
memcpy_toio()). It would make sense to use the fb_() helpers, if they 
are tailored towards this usecase.

Best regards
Thomas

> 
> So I'd go for the __raw_*() variants everywhere.
> 
> Gr{oetje,eeting}s,
> 
>                          Geert
> 

-- 
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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