drm/zte: 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: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Cc: Shawn Guo <shawnguo@kernel.org>
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20171123190502.28449-15-ville.syrjala@linux.intel.com
Acked-by: Shawn Guo <shawnguo@kernel.org>
Reviewed-by: Thierry Reding <treding@nvidia.com>

drivers/gpu/drm/zte/zx_plane.c

@@ -55,7 +55,7 @@ static int zx_vl_plane_atomic_check(struct drm_plane *plane,
 	struct drm_framebuffer *fb = plane_state->fb;
 	struct drm_crtc *crtc = plane_state->crtc;
 	struct drm_crtc_state *crtc_state;
-	struct drm_rect clip;
+	struct drm_rect clip = {};
 	int min_scale = FRAC_16_16(1, 8);
 	int max_scale = FRAC_16_16(8, 1);
 
@@ -75,10 +75,9 @@ static int zx_vl_plane_atomic_check(struct drm_plane *plane,
 	if (!plane_state->crtc)
 		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);
 
 	return drm_atomic_helper_check_plane_state(plane_state, crtc_state,
 						   &clip, min_scale, max_scale,
@@ -292,7 +291,7 @@ static int zx_gl_plane_atomic_check(struct drm_plane *plane,
 	struct drm_framebuffer *fb = plane_state->fb;
 	struct drm_crtc *crtc = plane_state->crtc;
 	struct drm_crtc_state *crtc_state;
-	struct drm_rect clip;
+	struct drm_rect clip = {};
 
 	if (!crtc || !fb)
 		return 0;
@@ -310,10 +309,9 @@ static int zx_gl_plane_atomic_check(struct drm_plane *plane,
 	if (!plane_state->crtc)
 		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);
 
 	return drm_atomic_helper_check_plane_state(plane_state, crtc_state,
 						   &clip,