drm/sun4i: Use drm_mode_get_hv_timing() to populate plane clip rectangle

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

Note that this replaces crtc_state->adjusted_mode usage with
crtc_state->mode. The latter is the correct choice since that's the
mode the user provided and it matches the plane crtc coordinates
the user also provided.

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

Cc: Maxime Ripard <maxime.ripard@free-electrons.com>
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20180123170857.13818-2-ville.syrjala@linux.intel.com
Reviewed-by: Maxime Ripard <maxime.ripard@free-electrons.com> #irc

drivers/gpu/drm/sun4i/sun8i_ui_layer.c

@@ -211,7 +211,7 @@ static int sun8i_ui_layer_atomic_check(struct drm_plane *plane,
 	struct drm_crtc *crtc = state->crtc;
 	struct drm_crtc_state *crtc_state;
 	int min_scale, max_scale;
-	struct drm_rect clip;
+	struct drm_rect clip = {};
 
 	if (!crtc)
 		return 0;
@@ -220,10 +220,9 @@ static int sun8i_ui_layer_atomic_check(struct drm_plane *plane,
 	if (WARN_ON(!crtc_state))
 		return -EINVAL;
 
-	clip.x1 = 0;
-	clip.y1 = 0;
-	clip.x2 = crtc_state->adjusted_mode.hdisplay;
-	clip.y2 = crtc_state->adjusted_mode.vdisplay;
+	if (crtc_state->enable)
+		drm_mode_get_hv_timing(&crtc_state->mode,
+				       &clip.x2, &clip.y2);
 
 	min_scale = DRM_PLANE_HELPER_NO_SCALING;
 	max_scale = DRM_PLANE_HELPER_NO_SCALING;

drivers/gpu/drm/sun4i/sun8i_vi_layer.c

@@ -239,7 +239,7 @@ static int sun8i_vi_layer_atomic_check(struct drm_plane *plane,
 	struct drm_crtc *crtc = state->crtc;
 	struct drm_crtc_state *crtc_state;
 	int min_scale, max_scale;
-	struct drm_rect clip;
+	struct drm_rect clip = {};
 
 	if (!crtc)
 		return 0;
@@ -248,10 +248,9 @@ static int sun8i_vi_layer_atomic_check(struct drm_plane *plane,
 	if (WARN_ON(!crtc_state))
 		return -EINVAL;
 
-	clip.x1 = 0;
-	clip.y1 = 0;
-	clip.x2 = crtc_state->adjusted_mode.hdisplay;
-	clip.y2 = crtc_state->adjusted_mode.vdisplay;
+	if (crtc_state->enable)
+		drm_mode_get_hv_timing(&crtc_state->mode,
+				       &clip.x2, &clip.y2);
 
 	min_scale = DRM_PLANE_HELPER_NO_SCALING;
 	max_scale = DRM_PLANE_HELPER_NO_SCALING;