linux-kernel - Re: [PATCH v2 0/5] fbdev: Use regular I/O function for framebuffers

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Date:   Fri, 28 Apr 2023 15:13:33 +0200
From:   Sam Ravnborg <sam@...nborg.org>
To:     Thomas Zimmermann <tzimmermann@...e.de>
Cc:     deller@....de, geert@...ux-m68k.org, 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,
        linux-arch@...r.kernel.org, linux-fbdev@...r.kernel.org,
        linux-ia64@...r.kernel.org, linux-parisc@...r.kernel.org,
        linux-kernel@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        linux-m68k@...ts.linux-m68k.org, loongarch@...ts.linux.dev,
        sparclinux@...r.kernel.org, linux-snps-arc@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v2 0/5] fbdev: Use regular I/O function for framebuffers

Hi Thomas,

On Fri, Apr 28, 2023 at 11:27:06AM +0200, Thomas Zimmermann wrote:
> (was: fbdev: Move framebuffer I/O helpers to <asm/fb.h>)
> 
> 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 all come down to regular I/O
> functions of similar names. So use the regular functions instead.
> 
> 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 <linux/io.h>.
> 
> Patch 5 replaces the architecture-based if-else branching in 
> <linux/fb.h> by define statements that map to Linux' I/O fucntions.
> 
> After this change has been merged and included in a few release
> without complains, we can update the drivers to regular I/O functions
> and remove the fbdev-specific defines.
> 
> The patchset has been built for a variety of platforms, such as x86-64,
> arm, aarch64, ppc64, parisc, m64k, mips and sparc.
> 
> v2:
> 	* use Linux I/O helpers (Sam, Arnd)
Much better, thanks!

	Sam