drm/armada: Use drm_mode_get_hv_timing() to populate plane clip rectangle

Use drm_mode_get_hv_timing() to fill out the plane clip rectangle.

Since armada isn't atomic we'll use crtc->enabled and crtc->mode instead
of the stuff under crtc_state.

Once everyone agrees on how the clip rectangle gets set up we can
move the code into drm_atomic_helper_check_plane_state().

Cc: Dave Airlie <airlied@redhat.com>
Cc: Russell King <rmk+kernel@armlinux.org.uk>
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20180123170857.13818-4-ville.syrjala@linux.intel.com
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Acked-by: Dave Airlie <airlied@redhat.com>

drivers/gpu/drm/armada/armada_crtc.c

@@ -1204,12 +1204,13 @@ static int armada_drm_primary_update(struct drm_plane *plane,
 		.crtc = crtc,
 		.enable = crtc->enabled,
 	};
-	const struct drm_rect clip = {
-		.x2 = crtc->mode.hdisplay,
-		.y2 = crtc->mode.vdisplay,
-	};
+	struct drm_rect clip = {};
 	int ret;
 
+	if (crtc->enabled)
+		drm_mode_get_hv_timing(&crtc->mode,
+				       &clip.x2, &clip.y2);
+
 	ret = drm_atomic_helper_check_plane_state(&state, &crtc_state, &clip, 0,
 						  INT_MAX, true, false);
 	if (ret)

drivers/gpu/drm/armada/armada_overlay.c

@@ -209,16 +209,17 @@ armada_ovl_plane_update(struct drm_plane *plane, struct drm_crtc *crtc,
 		.crtc = crtc,
 		.enable = crtc->enabled,
 	};
-	const struct drm_rect clip = {
-		.x2 = crtc->mode.hdisplay,
-		.y2 = crtc->mode.vdisplay,
-	};
+	struct drm_rect clip = {};
 	int ret;
 
 	trace_armada_ovl_plane_update(plane, crtc, fb,
 				 crtc_x, crtc_y, crtc_w, crtc_h,
 				 src_x, src_y, src_w, src_h);
 
+	if (crtc->enabled)
+		drm_mode_get_hv_timing(&crtc->mode,
+				       &clip.x2, &clip.y2);
+
 	ret = drm_atomic_helper_check_plane_state(&state, &crtc_state, &clip, 0,
 						  INT_MAX, true, false);
 	if (ret)