fbdev/s1d13xxxfb: 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.

To simplify the conversion, provide a dedicated fb_ops instance
for accelerated devices. No functional changes.
Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Acked-by: Javier Martinez Canillas <javierm@redhat.com>
Cc: Kristoffer Ericson <kristoffer.ericson@gmail.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230927074722.6197-32-tzimmermann@suse.de

drivers/video/fbdev/Kconfig

@@ -671,6 +671,7 @@ config FB_S1D13XXX
 	select FB_CFB_FILLRECT
 	select FB_CFB_COPYAREA
 	select FB_CFB_IMAGEBLIT
+	select FB_IOMEM_FOPS
 	help
 	  Support for S1D13XXX framebuffer device family (currently only
 	  working with S1D13806). Product specs at

drivers/video/fbdev/s1d13xxxfb.c

@@ -596,18 +596,26 @@ s1d13xxxfb_bitblt_solidfill(struct fb_info *info, const struct fb_fillrect *rect
 }
 
 /* framebuffer information structures */
-static struct fb_ops s1d13xxxfb_fbops = {
+static const struct fb_ops s1d13xxxfb_fbops = {
 	.owner		= THIS_MODULE,
+	FB_DEFAULT_IOMEM_OPS,
 	.fb_set_par	= s1d13xxxfb_set_par,
 	.fb_setcolreg	= s1d13xxxfb_setcolreg,
 	.fb_blank	= s1d13xxxfb_blank,
-
 	.fb_pan_display	= s1d13xxxfb_pan_display,
+};
 
-	/* gets replaced at chip detection time */
-	.fb_fillrect	= cfb_fillrect,
-	.fb_copyarea	= cfb_copyarea,
+static const struct fb_ops s1d13xxxfb_fbops_s1d13506 = {
+	.owner		= THIS_MODULE,
+	__FB_DEFAULT_IOMEM_OPS_RDWR,
+	.fb_set_par	= s1d13xxxfb_set_par,
+	.fb_setcolreg	= s1d13xxxfb_setcolreg,
+	.fb_blank	= s1d13xxxfb_blank,
+	.fb_pan_display	= s1d13xxxfb_pan_display,
+	.fb_fillrect	= s1d13xxxfb_bitblt_solidfill,
+	.fb_copyarea	= s1d13xxxfb_bitblt_copyarea,
 	.fb_imageblit	= cfb_imageblit,
+	__FB_DEFAULT_IOMEM_OPS_MMAP,
 };
 
 static int s1d13xxxfb_width_tab[2][4] = {
@@ -869,17 +877,16 @@ static int s1d13xxxfb_probe(struct platform_device *pdev)
 	       default_par->regs, info->fix.smem_len / 1024, info->screen_base);
 
 	info->par = default_par;
-	info->flags = FBINFO_HWACCEL_YPAN;
-	info->fbops = &s1d13xxxfb_fbops;
 
 	switch(prod_id) {
 	case S1D13506_PROD_ID:	/* activate acceleration */
-		s1d13xxxfb_fbops.fb_fillrect = s1d13xxxfb_bitblt_solidfill;
-		s1d13xxxfb_fbops.fb_copyarea = s1d13xxxfb_bitblt_copyarea;
 		info->flags = FBINFO_HWACCEL_YPAN |
 			FBINFO_HWACCEL_FILLRECT | FBINFO_HWACCEL_COPYAREA;
+		info->fbops = &s1d13xxxfb_fbops_s1d13506;
 		break;
 	default:
+		info->flags = FBINFO_HWACCEL_YPAN;
+		info->fbops = &s1d13xxxfb_fbops;
 		break;
 	}