Hi Sam Am 26.04.23 um 21:21 schrieb Sam Ravnborg:
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.
I looked through the existing versions of the fb_() I/O helpers. They can apparently be implemented with the regular helpers of similar names.
I'm not sure, but even Sparc looks compatible. At least these sbus_ functions seem to be equivalent to the __raw_() I/O helpers of similar names. Do you still have that Sparc emulator?
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.
Which challenges did you see? Best regards Thomas
Sam
-- 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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