[PATCH 3/4] drm/vkms: Add atomic_helper_check_plane_state

[Haneen Mohammed <hamohammed.sa@gmail.com>]

Call atomic_helper_check_plane_state to clip plane coordinates.

Signed-off-by: Haneen Mohammed <hamohammed.sa@gmail.com>
---
 drivers/gpu/drm/vkms/vkms_plane.c | 18 ++++++++++++++++--
 1 file changed, 16 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/vkms/vkms_plane.c b/drivers/gpu/drm/vkms/vkms_plane.c
index f464eb0e05dd..bf37aebac0fb 100644
--- a/drivers/gpu/drm/vkms/vkms_plane.c
+++ b/drivers/gpu/drm/vkms/vkms_plane.c
@@ -7,9 +7,10 @@
  */
 
 #include "vkms_drv.h"
-#include <drm/drm_plane_helper.h>
+#include <drm/drm_atomic.h>
 #include <drm/drm_atomic_helper.h>
 #include <drm/drm_gem_framebuffer_helper.h>
+#include <drm/drm_plane_helper.h>
 
 static const struct drm_plane_funcs vkms_plane_funcs = {
 	.update_plane		= drm_atomic_helper_update_plane,
@@ -23,7 +24,20 @@ static const struct drm_plane_funcs vkms_plane_funcs = {
 static int vkms_plane_atomic_check(struct drm_plane *plane,
 				   struct drm_plane_state *state)
 {
-	return 0;
+	struct drm_crtc_state *crtc_state;
+
+	if (!state->fb || !state->crtc)
+		return 0;
+
+	crtc_state = drm_atomic_get_crtc_state(state->state, state->crtc);
+
+	if (IS_ERR(crtc_state))
+		return PTR_ERR(crtc_state);
+
+	return drm_atomic_helper_check_plane_state(state, crtc_state,
+						   DRM_PLANE_HELPER_NO_SCALING,
+						   DRM_PLANE_HELPER_NO_SCALING,
+						   false, true);
 }
 
 static void vkms_primary_plane_update(struct drm_plane *plane,
-- 
2.17.1

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