drm/virtio: 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.

Cc: David Airlie <airlied@redhat.com>
Cc: Gerd Hoffmann <kraxel@redhat.com>
Cc: Dmitry Osipenko <dmitry.osipenko@collabora.com>
Cc: Gurchetan Singh <gurchetansingh@chromium.org>
Cc: Chia-I Wu <olvaffe@gmail.com>
Cc: virtualization@lists.linux.dev
Reviewed-by: Thomas Zimmermann <tzimmermann@suse.de>
Acked-by: Dmitry Osipenko <dmitry.osipenko@collabora.com>
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20250701090722.13645-18-ville.syrjala@linux.intel.com

Author: vsyrjala

drivers/gpu/drm/virtio/virtgpu_display.c

@@ -66,14 +66,15 @@ static const struct drm_framebuffer_funcs virtio_gpu_fb_funcs = {
 static int
 virtio_gpu_framebuffer_init(struct drm_device *dev,
 			    struct virtio_gpu_framebuffer *vgfb,
+			    const struct drm_format_info *info,
 			    const struct drm_mode_fb_cmd2 *mode_cmd,
 			    struct drm_gem_object *obj)
 {
 	int ret;
 
 	vgfb->base.obj[0] = obj;
 
-	drm_helper_mode_fill_fb_struct(dev, &vgfb->base, NULL, mode_cmd);
+	drm_helper_mode_fill_fb_struct(dev, &vgfb->base, info, mode_cmd);
 
 	ret = drm_framebuffer_init(dev, &vgfb->base, &virtio_gpu_fb_funcs);
 	if (ret) {
@@ -315,7 +316,7 @@ virtio_gpu_user_framebuffer_create(struct drm_device *dev,
 		return ERR_PTR(-ENOMEM);
 	}
 
-	ret = virtio_gpu_framebuffer_init(dev, virtio_gpu_fb, mode_cmd, obj);
+	ret = virtio_gpu_framebuffer_init(dev, virtio_gpu_fb, info, mode_cmd, obj);
 	if (ret) {
 		kfree(virtio_gpu_fb);
 		drm_gem_object_put(obj);