drm: Look up the format info earlier

Look up the format info already in drm_internal_framebuffer_create()
so that we can later pass it along to .fb_create(). Currently various
drivers are doing additional lookups in their .fb_create()
implementations, and these lookups are rather expensive now (given
how many different pixel formats we have).

v2: Fix commit msg (Thomas)

Reviewed-by: Thomas Zimmermann <tzimmermann@suse.de>
Reviewed-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20250701090722.13645-4-ville.syrjala@linux.intel.com

Author: vsyrjala

drivers/gpu/drm/drm_framebuffer.c

@@ -153,18 +153,11 @@ int drm_mode_addfb_ioctl(struct drm_device *dev,
 }
 
 static int framebuffer_check(struct drm_device *dev,
+			     const struct drm_format_info *info,
 			     const struct drm_mode_fb_cmd2 *r)
 {
-	const struct drm_format_info *info;
 	int i;
 
-	/* check if the format is supported at all */
-	if (!__drm_format_info(r->pixel_format)) {
-		drm_dbg_kms(dev, "bad framebuffer format %p4cc\n",
-			    &r->pixel_format);
-		return -EINVAL;
-	}
-
 	if (r->width == 0) {
 		drm_dbg_kms(dev, "bad framebuffer width %u\n", r->width);
 		return -EINVAL;
@@ -175,9 +168,6 @@ static int framebuffer_check(struct drm_device *dev,
 		return -EINVAL;
 	}
 
-	/* now let the driver pick its own format info */
-	info = drm_get_format_info(dev, r->pixel_format, r->modifier[0]);
-
 	for (i = 0; i < info->num_planes; i++) {
 		unsigned int width = drm_format_info_plane_width(info, r->width, i);
 		unsigned int height = drm_format_info_plane_height(info, r->height, i);
@@ -272,6 +262,7 @@ drm_internal_framebuffer_create(struct drm_device *dev,
 				struct drm_file *file_priv)
 {
 	struct drm_mode_config *config = &dev->mode_config;
+	const struct drm_format_info *info;
 	struct drm_framebuffer *fb;
 	int ret;
 
@@ -297,7 +288,17 @@ drm_internal_framebuffer_create(struct drm_device *dev,
 		return ERR_PTR(-EINVAL);
 	}
 
-	ret = framebuffer_check(dev, r);
+	/* check if the format is supported at all */
+	if (!__drm_format_info(r->pixel_format)) {
+		drm_dbg_kms(dev, "bad framebuffer format %p4cc\n",
+			    &r->pixel_format);
+		return ERR_PTR(-EINVAL);
+	}
+
+	/* now let the driver pick its own format info */
+	info = drm_get_format_info(dev, r->pixel_format, r->modifier[0]);
+
+	ret = framebuffer_check(dev, info, r);
 	if (ret)
 		return ERR_PTR(ret);