drm/vc4: Correct buffer address on async commit when vertically flipped

The buffer address needs to be for the last line of the image if
vertically flipped. The main commit code was handling this, but
the async path wasn't.

Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.com>

Author: 6by9

drivers/gpu/drm/vc4/vc4_plane.c

@@ -2400,15 +2400,26 @@ u32 vc4_plane_dlist_size(const struct drm_plane_state *state)
  */
 void vc4_plane_async_set_fb(struct drm_plane *plane, struct drm_framebuffer *fb)
 {
-	struct vc4_plane_state *vc4_state = to_vc4_plane_state(plane->state);
+	struct drm_plane_state *state = plane->state;
+	struct vc4_plane_state *vc4_state = to_vc4_plane_state(state);
 	struct drm_gem_dma_object *bo = drm_fb_dma_get_gem_obj(fb, 0);
 	struct vc4_dev *vc4 = to_vc4_dev(plane->dev);
 	dma_addr_t dma_addr = bo->dma_addr + fb->offsets[0];
+	unsigned int rotation;
 	int idx;
 
 	if (!drm_dev_enter(plane->dev, &idx))
 		return;
 
+	rotation = drm_rotation_simplify(state->rotation,
+					 DRM_MODE_ROTATE_0 |
+					 DRM_MODE_REFLECT_X |
+					 DRM_MODE_REFLECT_Y);
+
+	/* We must point to the last line when Y reflection is enabled. */
+	if (rotation & DRM_MODE_REFLECT_Y)
+		dma_addr += fb->pitches[0] * ((vc4_state->src_h[0] >> 16) - 1);
+
 	/* We're skipping the address adjustment for negative origin,
 	 * because this is only called on the primary plane.
 	 */