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fbdev/amifb: Initialize fb_ops to fbdev I/O-memory helpers

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Initialize the instance of struct fb_ops with fbdev initializer
macros for framebuffers in I/O address space. Set the read/write,
draw and mmap callbacks to the correct implementation and avoid
implicit defaults. Also select the necessary I/O helpers in Kconfig.

Fbdev drivers sometimes rely on the callbacks being NULL for a
default implementation to be invoked; hence requiring the I/O
helpers to be built in any case. Setting all callbacks in all
drivers explicitly will allow to make the I/O helpers optional.
This benefits systems that do not use these functions.

No functional changes.

Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Acked-by: Javier Martinez Canillas <javierm@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230927074722.6197-5-tzimmermann@suse.de
This commit is contained in:
Thomas Zimmermann
2023-09-27 09:26:37 +02:00
parent b910005c98
commit 48c3734d41
2 changed files with 3 additions and 0 deletions
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1
drivers/video/fbdev/Kconfig
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@@ -225,6 +225,7 @@ config FB_Q40
config FB_AMIGA
tristate "Amiga native chipset support"
depends on FB && AMIGA
select FB_IOMEM_FOPS
help
This is the frame buffer device driver for the builtin graphics
chipset found in Amigas.