drm/vkms: Add atomic_helper_check_plane_state

[linux-2.6-microblaze.git] / drivers / gpu / drm / vkms / vkms_plane.c

diff --git a/drivers/gpu/drm/vkms/vkms_plane.c b/drivers/gpu/drm/vkms/vkms_plane.c
index 5611e7c..8191940 100644 (file)
--- a/drivers/gpu/drm/vkms/vkms_plane.c
+++ b/drivers/gpu/drm/vkms/vkms_plane.c
@@ -8,6 +8,7 @@
 
 #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>
 
@@ -25,6 +26,33 @@ static void vkms_primary_plane_update(struct drm_plane *plane,
 {
 }
 
+static int vkms_plane_atomic_check(struct drm_plane *plane,
+                                  struct drm_plane_state *state)
+{
+       struct drm_crtc_state *crtc_state;
+       int ret;
+
+       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);
+
+       ret = drm_atomic_helper_check_plane_state(state, crtc_state,
+                                                 DRM_PLANE_HELPER_NO_SCALING,
+                                                 DRM_PLANE_HELPER_NO_SCALING,
+                                                 false, true);
+       if (ret != 0)
+               return ret;
+
+       /* for now primary plane must be visible and full screen */
+       if (!state->visible)
+               return -EINVAL;
+
+       return 0;
+}
+
 static int vkms_prepare_fb(struct drm_plane *plane,
                           struct drm_plane_state *state)
 {
@@ -58,6 +86,7 @@ static void vkms_cleanup_fb(struct drm_plane *plane,
 
 static const struct drm_plane_helper_funcs vkms_primary_helper_funcs = {
        .atomic_update          = vkms_primary_plane_update,
+       .atomic_check           = vkms_plane_atomic_check,
        .prepare_fb             = vkms_prepare_fb,
        .cleanup_fb             = vkms_cleanup_fb,
 };