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

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/20230927074722.6197-14-tzimmermann@suse.de

diff --git a/drivers/video/fbdev/Kconfig b/drivers/video/fbdev/Kconfig
index 43753f1..0ad8ef7 100644 (file)
--- a/drivers/video/fbdev/Kconfig
+++ b/drivers/video/fbdev/Kconfig
@@ -217,6 +217,7 @@ config FB_APOLLO
        default y
        select FB_CFB_FILLRECT
        select FB_CFB_IMAGEBLIT
+       select FB_IOMEM_FOPS
 
 config FB_Q40
        bool

diff --git a/drivers/video/fbdev/dnfb.c b/drivers/video/fbdev/dnfb.c
index 18405c4..c4d2454 100644 (file)
--- a/drivers/video/fbdev/dnfb.c
+++ b/drivers/video/fbdev/dnfb.c
@@ -110,10 +110,12 @@ static void dnfb_copyarea(struct fb_info *info, const struct fb_copyarea *area);
 
 static const struct fb_ops dn_fb_ops = {
        .owner          = THIS_MODULE,
+       __FB_DEFAULT_IOMEM_OPS_RDWR,
        .fb_blank       = dnfb_blank,
        .fb_fillrect    = cfb_fillrect,
        .fb_copyarea    = dnfb_copyarea,
        .fb_imageblit   = cfb_imageblit,
+       __FB_DEFAULT_IOMEM_OPS_MMAP,
 };
 
 static const struct fb_var_screeninfo dnfb_var = {