fbdev/vga16fb: Do not use struct fb_info.apertures

Acquire ownership of the firmware scanout buffer by calling Linux'
aperture helpers. Remove the use of struct fb_info.apertures and do
not set FBINFO_MISC_FIRMWARE; both of which previously configured
buffer ownership.
Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Reviewed-by: Javier Martinez Canillas <javierm@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20221219160516.23436-18-tzimmermann@suse.de

drivers/video/fbdev/vga16fb.c

@@ -10,6 +10,7 @@
  * archive for more details.
  */
 
+#include <linux/aperture.h>
 #include <linux/module.h>
 #include <linux/kernel.h>
 #include <linux/errno.h>
@@ -1324,11 +1325,6 @@ static int vga16fb_probe(struct platform_device *dev)
 		ret = -ENOMEM;
 		goto err_fb_alloc;
 	}
-	info->apertures = alloc_apertures(1);
-	if (!info->apertures) {
-		ret = -ENOMEM;
-		goto err_ioremap;
-	}
 
 	/* XXX share VGA_FB_PHYS_BASE and I/O region with vgacon and others */
 	info->screen_base = (void __iomem *)VGA_MAP_MEM(VGA_FB_PHYS_BASE, 0);
@@ -1363,8 +1359,7 @@ static int vga16fb_probe(struct platform_device *dev)
 	info->fix = vga16fb_fix;
 	/* supports rectangles with widths of multiples of 8 */
 	info->pixmap.blit_x = 1 << 7 | 1 << 15 | 1 << 23 | 1 << 31;
-	info->flags = FBINFO_FLAG_DEFAULT | FBINFO_MISC_FIRMWARE |
-		FBINFO_HWACCEL_YPAN;
+	info->flags = FBINFO_FLAG_DEFAULT | FBINFO_HWACCEL_YPAN;
 
 	i = (info->var.bits_per_pixel == 8) ? 256 : 16;
 	ret = fb_alloc_cmap(&info->cmap, i, 0);
@@ -1382,9 +1377,9 @@ static int vga16fb_probe(struct platform_device *dev)
 
 	vga16fb_update_fix(info);
 
-	info->apertures->ranges[0].base = VGA_FB_PHYS_BASE;
-	info->apertures->ranges[0].size = VGA_FB_PHYS_SIZE;
-
+	ret = devm_aperture_acquire_for_platform_device(dev, VGA_FB_PHYS_BASE, VGA_FB_PHYS_SIZE);
+	if (ret)
+		goto err_check_var;
 	if (register_framebuffer(info) < 0) {
 		printk(KERN_ERR "vga16fb: unable to register framebuffer\n");
 		ret = -EINVAL;