drm/exynos: Pass along the format info from .fb_create() to drm_helper_mode_fill_fb_struct()

Plumb the format info from .fb_create() all the way to
drm_helper_mode_fill_fb_struct() to avoid the redundant
lookup.

For the fbdev case a manual drm_get_format_info() lookup
is needed.

Cc: Inki Dae <inki.dae@samsung.com>
Cc: Seung-Woo Kim <sw0312.kim@samsung.com>
Cc: Kyungmin Park <kyungmin.park@samsung.com>
Reviewed-by: Thomas Zimmermann <tzimmermann@suse.de>
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20250701090722.13645-12-ville.syrjala@linux.intel.com

Author: vsyrjala

drivers/gpu/drm/exynos/exynos_drm_fb.c

@@ -56,6 +56,7 @@ static const struct drm_framebuffer_funcs exynos_drm_fb_funcs = {
 
 struct drm_framebuffer *
 exynos_drm_framebuffer_init(struct drm_device *dev,
+			    const struct drm_format_info *info,
 			    const struct drm_mode_fb_cmd2 *mode_cmd,
 			    struct exynos_drm_gem **exynos_gem,
 			    int count)
@@ -76,7 +77,7 @@ exynos_drm_framebuffer_init(struct drm_device *dev,
 		fb->obj[i] = &exynos_gem[i]->base;
 	}
 
-	drm_helper_mode_fill_fb_struct(dev, fb, NULL, mode_cmd);
+	drm_helper_mode_fill_fb_struct(dev, fb, info, mode_cmd);
 
 	ret = drm_framebuffer_init(dev, fb, &exynos_drm_fb_funcs);
 	if (ret < 0) {
@@ -124,7 +125,7 @@ exynos_user_fb_create(struct drm_device *dev, struct drm_file *file_priv,
 		}
 	}
 
-	fb = exynos_drm_framebuffer_init(dev, mode_cmd, exynos_gem, i);
+	fb = exynos_drm_framebuffer_init(dev, info, mode_cmd, exynos_gem, i);
 	if (IS_ERR(fb)) {
 		ret = PTR_ERR(fb);
 		goto err;

drivers/gpu/drm/exynos/exynos_drm_fb.h

@@ -14,6 +14,7 @@
 
 struct drm_framebuffer *
 exynos_drm_framebuffer_init(struct drm_device *dev,
+			    const struct drm_format_info *info,
 			    const struct drm_mode_fb_cmd2 *mode_cmd,
 			    struct exynos_drm_gem **exynos_gem,
 			    int count);

drivers/gpu/drm/exynos/exynos_drm_fbdev.c

@@ -116,7 +116,10 @@ int exynos_drm_fbdev_driver_fbdev_probe(struct drm_fb_helper *helper,
 		return PTR_ERR(exynos_gem);
 
 	helper->fb =
-		exynos_drm_framebuffer_init(dev, &mode_cmd, &exynos_gem, 1);
+		exynos_drm_framebuffer_init(dev,
+					    drm_get_format_info(dev, mode_cmd.pixel_format,
+								mode_cmd.modifier[0]),
+					    &mode_cmd, &exynos_gem, 1);
 	if (IS_ERR(helper->fb)) {
 		DRM_DEV_ERROR(dev->dev, "failed to create drm framebuffer.\n");
 		ret = PTR_ERR(helper->fb);