Commit 6f0f6941 authored by Thomas Zimmermann's avatar Thomas Zimmermann
Browse files

fbdev: Add fb_ops init macros for framebuffers in DMA-able memory 



Add initializer macros for struct fb_ops for framebuffers in DMA-able
memory areas. Also add a corresponding Kconfig token. As of now, this
is equivalent to system framebuffers and mostly useful for labeling
drivers correctly.

A later patch may add a generic DMA-specific mmap operation. Linux
offers a number of dma_mmap_*() helpers for different use cases.

Signed-off-by: default avatarThomas Zimmermann <tzimmermann@suse.de>
Reviewed-by: default avatarJavier Martinez Canillas <javierm@redhat.com>
Acked-by: default avatarMaxime Ripard <mripard@kernel.org>
Cc: Helge Deller <deller@gmx.de>
Link: https://patchwork.freedesktop.org/patch/msgid/20230707083422.18691-2-tzimmermann@suse.de
parent e6fa4816

drivers/video/fbdev/core/Kconfig

+8 −0
Original line number Diff line number Diff line
@@ -136,6 +136,14 @@ config FB_DEFERRED_IO 
	bool

	depends on FB_CORE



config FB_DMA_HELPERS

	bool

	depends on FB_CORE

	select FB_SYS_COPYAREA

	select FB_SYS_FILLRECT

	select FB_SYS_FOPS

	select FB_SYS_IMAGEBLIT



config FB_IO_HELPERS

	bool

	depends on FB_CORE

include/linux/fb.h

+13 −0
Original line number Diff line number Diff line
@@ -591,6 +591,19 @@ extern ssize_t fb_sys_write(struct fb_info *info, const char __user *buf, 
	__FB_DEFAULT_SYS_OPS_DRAW, \

	__FB_DEFAULT_SYS_OPS_MMAP



/*

 * Helpers for framebuffers in DMA-able memory

 */



#define __FB_DEFAULT_DMA_OPS_RDWR \

	.fb_read	= fb_sys_read, \

	.fb_write	= fb_sys_write



#define __FB_DEFAULT_DMA_OPS_DRAW \

	.fb_fillrect	= sys_fillrect, \

	.fb_copyarea	= sys_copyarea, \

	.fb_imageblit	= sys_imageblit



/* drivers/video/fbmem.c */

extern int register_framebuffer(struct fb_info *fb_info);

extern void unregister_framebuffer(struct fb_info *fb_info);