drm/nouveau/kms/nv50: Use drm_mode_get_hv_timing() to populate plane clip rectangle

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

No functional changes as the code already uses crtc_state->mode
to populate the clip, which is also what drm_mode_get_hv_timing()
uses.

Once everyone agrees on this we can move the clip handling into
drm_atomic_helper_check_plane_state().

Cc: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Cc: Ben Skeggs <bskeggs@redhat.com>
Cc: nouveau@lists.freedesktop.org
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20171123190502.28449-11-ville.syrjala@linux.intel.com
Reviewed-by: Thierry Reding <treding@nvidia.com>

drivers/gpu/drm/nouveau/nv50_display.c

@@ -228,8 +228,6 @@ struct nv50_wndw_atom {
 	struct drm_plane_state state;
 	u8 interval;
 
-	struct drm_rect clip;
-
 	struct {
 		u32  handle;
 		u16  offset:12;
@@ -840,10 +838,6 @@ nv50_wndw_atomic_check_acquire(struct nv50_wndw *wndw,
 	int ret;
 
 	NV_ATOMIC(drm, "%s acquire\n", wndw->plane.name);
-	asyw->clip.x1 = 0;
-	asyw->clip.y1 = 0;
-	asyw->clip.x2 = asyh->state.mode.hdisplay;
-	asyw->clip.y2 = asyh->state.mode.vdisplay;
 
 	asyw->image.w = fb->base.width;
 	asyw->image.h = fb->base.height;
@@ -1141,10 +1135,15 @@ static int
 nv50_curs_acquire(struct nv50_wndw *wndw, struct nv50_wndw_atom *asyw,
 		  struct nv50_head_atom *asyh)
 {
+	struct drm_rect clip = {};
 	int ret;
 
+	if (asyh->state.enable)
+		drm_mode_get_hv_timing(&asyh->state.mode,
+				       &clip.x2, &clip.y2);
+
 	ret = drm_atomic_helper_check_plane_state(&asyw->state, &asyh->state,
-						  &asyw->clip,
+						  &clip,
 						  DRM_PLANE_HELPER_NO_SCALING,
 						  DRM_PLANE_HELPER_NO_SCALING,
 						  true, true);
@@ -1428,13 +1427,18 @@ nv50_base_acquire(struct nv50_wndw *wndw, struct nv50_wndw_atom *asyw,
 		  struct nv50_head_atom *asyh)
 {
 	const struct drm_framebuffer *fb = asyw->state.fb;
+	struct drm_rect clip = {};
 	int ret;
 
 	if (!fb->format->depth)
 		return -EINVAL;
 
+	if (asyh->state.enable)
+		drm_mode_get_hv_timing(&asyh->state.mode,
+				       &clip.x2, &clip.y2);
+
 	ret = drm_atomic_helper_check_plane_state(&asyw->state, &asyh->state,
-						  &asyw->clip,
+						  &clip,
 						  DRM_PLANE_HELPER_NO_SCALING,
 						  DRM_PLANE_HELPER_NO_SCALING,
 						  false, true);