drm/amd/display: update plane functionalities

This patch introduces amdgpu_drm_plane_state
structure, which subclasses drm_plane_state and
holds data suitable for configuring hardware.

It switches reset(), atomic_duplicate_state()
& atomic_destroy_state() functions to new internal
implementation, earlier they were pointing to
drm core functions.

TESTS(On Chromium OS on Stoney Only)
* Builds without compilation errors.
* 'plane_test' passes for XR24 format
  based Overlay plane.
* Chromium OS ui comes up.
Signed-off-by: Shirish S <shirish.s@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/amdgpu/amdgpu_mode.h

@@ -57,6 +57,7 @@ struct amdgpu_hpd;
 #define to_amdgpu_connector(x) container_of(x, struct amdgpu_connector, base)
 #define to_amdgpu_encoder(x) container_of(x, struct amdgpu_encoder, base)
 #define to_amdgpu_framebuffer(x) container_of(x, struct amdgpu_framebuffer, base)
+#define to_amdgpu_plane(x)	container_of(x, struct amdgpu_plane, base)
 
 #define AMDGPU_MAX_HPD_PINS 6
 #define AMDGPU_MAX_CRTCS 6
@@ -439,6 +440,18 @@ struct amdgpu_crtc {
 	struct drm_pending_vblank_event *event;
 };
 
+struct amdgpu_drm_plane_state {
+	struct drm_plane_state base;
+	unsigned int h_ratio;
+	unsigned int v_ratio;
+};
+
+static inline struct amdgpu_drm_plane_state *
+to_amdgpu_plane_state(struct drm_plane_state *state)
+{
+	return container_of(state, struct amdgpu_drm_plane_state, base);
+}
+
 struct amdgpu_plane {
 	struct drm_plane base;
 	enum drm_plane_type plane_type;

drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_types.c

@@ -1445,12 +1445,56 @@ const struct drm_encoder_helper_funcs amdgpu_dm_encoder_helper_funcs = {
 	.atomic_check = dm_encoder_helper_atomic_check
 };
 
+static void dm_drm_plane_reset(struct drm_plane *plane)
+{
+	struct amdgpu_drm_plane_state *amdgpu_state;
+
+	if (plane->state) {
+		amdgpu_state = to_amdgpu_plane_state(plane->state);
+		if (amdgpu_state->base.fb)
+			drm_framebuffer_unreference(amdgpu_state->base.fb);
+		kfree(amdgpu_state);
+		plane->state = NULL;
+	}
+
+	amdgpu_state = kzalloc(sizeof(*amdgpu_state), GFP_KERNEL);
+	if (amdgpu_state) {
+		plane->state = &amdgpu_state->base;
+		plane->state->plane = plane;
+	}
+}
+
+static struct drm_plane_state *
+dm_drm_plane_duplicate_state(struct drm_plane *plane)
+{
+	struct amdgpu_drm_plane_state *amdgpu_state;
+	struct amdgpu_drm_plane_state *copy;
+
+	amdgpu_state = to_amdgpu_plane_state(plane->state);
+	copy = kzalloc(sizeof(*amdgpu_state), GFP_KERNEL);
+	if (!copy)
+		return NULL;
+
+	__drm_atomic_helper_plane_duplicate_state(plane, &copy->base);
+	return &copy->base;
+}
+
+static void dm_drm_plane_destroy_state(struct drm_plane *plane,
+					   struct drm_plane_state *old_state)
+{
+	struct amdgpu_drm_plane_state *old_amdgpu_state =
+					to_amdgpu_plane_state(old_state);
+	__drm_atomic_helper_plane_destroy_state(old_state);
+	kfree(old_amdgpu_state);
+}
+
 static const struct drm_plane_funcs dm_plane_funcs = {
-	.update_plane   = drm_atomic_helper_update_plane,
-	.disable_plane  = drm_atomic_helper_disable_plane,
-	.reset = drm_atomic_helper_plane_reset,
-	.atomic_duplicate_state = drm_atomic_helper_plane_duplicate_state,
-	.atomic_destroy_state = drm_atomic_helper_plane_destroy_state
+	.update_plane	= drm_atomic_helper_update_plane,
+	.disable_plane	= drm_atomic_helper_disable_plane,
+	.destroy	= drm_plane_cleanup,
+	.reset = dm_drm_plane_reset,
+	.atomic_duplicate_state = dm_drm_plane_duplicate_state,
+	.atomic_destroy_state = dm_drm_plane_destroy_state,
 };
 
 static int dm_plane_helper_prepare_fb(