fbdev/sm501fb: Initialize fb_ops to fbdev I/O-memory helpers

Initialize each 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/20230927074722.6197-37-tzimmermann@suse.de

This commit is contained in:

Thomas Zimmermann

2023-09-27 09:27:09 +02:00

parent 3fa0ee772b

commit 30543d363d

2 changed files with 5 additions and 0 deletions

drivers/video/fbdev/Kconfig

View File

@@ -1667,6 +1667,7 @@ config FB_SM501
 	select FB_CFB_FILLRECT
 	select FB_CFB_COPYAREA
 	select FB_CFB_IMAGEBLIT
 	select FB_IOMEM_FOPS
 	help
 	  Frame buffer driver for the CRT and LCD controllers in the Silicon
 	  Motion SM501.