Re: [PATCH 0/5] fbdev: Move framebuffer I/O helpers to <asm/fb.h>

[Sam Ravnborg <sam@xxxxxxxxxxxx>]

Hi Thomas.

On Wed, Apr 26, 2023 at 03:04:15PM +0200, Thomas Zimmermann wrote:
> 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. It's still all located in fbdev's main
> header file <linux/fb.h>. Move all of it into each archtecture's
> <asm/fb.h>, with shared code in <asm-generic/fb.h>.

For once I think this cleanup is moving things in the wrong direction.

The fb_* helpers predates the generic io.h support and try to
add a generic layer for read read / write operations.

The right fix would be to migrate fb_* to use the io helpers
we have today - so we use the existing way to handle the architecture
specific details.

>From a quick look there seems to be some challenges but the current
helpers that re-do part of io.h is not the way forward and hiding them
in arch/include/asm/fb.h seems counter productive.

	Sam