gpu/drm: ingenic: Use the plane's src_[x,y] to configure DMA length

Instead of obtaining the width/height of the framebuffer from the CRTC
state, obtain it from the current plane state.

v2: No change
Signed-off-by: Paul Cercueil <paul@crapouillou.net>
Link: https://patchwork.freedesktop.org/patch/msgid/20191210144142.33143-3-paul@crapouillou.net
# *** extracted tags ***
Acked-by: Sam Ravnborg <sam@ravnborg.org>

drivers/gpu/drm/ingenic/ingenic-drm.c

@@ -376,8 +376,8 @@ static void ingenic_drm_plane_atomic_update(struct drm_plane *plane,
 
 	if (state && state->fb) {
 		addr = drm_fb_cma_get_gem_addr(state->fb, state, 0);
-		width = state->crtc->state->adjusted_mode.hdisplay;
-		height = state->crtc->state->adjusted_mode.vdisplay;
+		width = state->src_w >> 16;
+		height = state->src_h >> 16;
 		cpp = state->fb->format->cpp[plane->index];
 
 		priv->dma_hwdesc->addr = addr;