linux-kernel - Re: [PATCH v3 0/6] fbdev: Move framebuffer I/O helpers to <asm/fb.h>

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Date:   Wed, 3 May 2023 10:21:50 +0200
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Thomas Zimmermann <tzimmermann@...e.de>
Cc:     deller@....de, javierm@...hat.com, daniel@...ll.ch,
        vgupta@...nel.org, chenhuacai@...nel.org, kernel@...0n.name,
        davem@...emloft.net, James.Bottomley@...senpartnership.com,
        arnd@...db.de, sam@...nborg.org, linux-fbdev@...r.kernel.org,
        dri-devel@...ts.freedesktop.org, linux-arch@...r.kernel.org,
        linux-snps-arc@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-ia64@...r.kernel.org, loongarch@...ts.linux.dev,
        linux-m68k@...ts.linux-m68k.org, sparclinux@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-parisc@...r.kernel.org
Subject: Re: [PATCH v3 0/6] fbdev: Move framebuffer I/O helpers to <asm/fb.h>

Hi Thomas,

On Tue, May 2, 2023 at 3:02 PM Thomas Zimmermann <tzimmermann@...e.de> wrote:
> (was: fbdev: Use regular I/O function for framebuffers)
>
> Fbdev provides helpers for framebuffer I/O, such as fb_readl(),
> fb_writel() or fb_memcpy_to_fb(). The implementation of each helper
> depends on the architecture, but they are all equivalent to regular
> I/O functions of similar names. So use regular functions instead and
> move all helpers into <asm-generic/fb.h>
>
> The first patch a simple whitespace cleanup.
>
> Until now, <linux/fb.h> contained an include of <asm/io.h>. As this
> will go away patches 2 to 4 prepare include statements in the various
> drivers. Source files that use regular I/O helpers, such as readl(),
> now include <linux/io.h>. Source files that use framebuffer I/O
> helpers, such as fb_readl(), also include <asm/fb.h>.
>
> Patch 5 replaces the architecture-based if-else branching in
> <linux/fb.h> by helpers in <asm-generic/fb.h>. All helpers use Linux'
> existing I/O functions.
>
> Patch 6 harmonizes naming among fbdev and existing I/O functions.
>
> The patchset has been built for a variety of platforms, such as x86-64,
> arm, aarch64, ppc64, parisc, m64k, mips and sparc.
>
> v3:
>         * add the new helpers in <asm-generic/fb.h>
>         * support reordering and native byte order (Geert, Arnd)

Thanks, this fixes the mangled display I was seeing on ARAnyM
with bpp=16.

BTW, this series seems to have mixed dependencies: the change
to include/asm-generic/fb.h depends on "[PATCH v3 00/19] arch:
Consolidate <asm/fb.h>"[1], but with that applied, I had to manually
fixup drivers/video/fbdev/core/fb_cfb_fops.c.

[1] https://lore.kernel.org/all/20230417125651.25126-1-tzimmermann@suse.de,

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