drm/ast: Introduce struct ast_crtc_state

AST-specific CRTC state can be placed in the new struct ast_crtc_state.
The atomic check functions of the CRTC and the primary plane will store
the VBIOS mode info and the framebuffer format here. The CRTC will consume
these during atomic_flush().

Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Acked-by: Gerd Hoffmann <kraxel@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20191202111557.15176-6-tzimmermann@suse.de

drivers/gpu/drm/ast/ast_drv.h

@@ -281,6 +281,12 @@ struct ast_vbios_mode_info {
 	const struct ast_vbios_enhtable *enh_table;
 };
 
+struct ast_crtc_state {
+	struct drm_crtc_state base;
+};
+
+#define to_ast_crtc_state(state) container_of(state, struct ast_crtc_state, base)
+
 extern int ast_mode_init(struct drm_device *dev);
 extern void ast_mode_fini(struct drm_device *dev);
 

drivers/gpu/drm/ast/ast_mode.c

@@ -884,15 +884,40 @@ static void ast_crtc_destroy(struct drm_crtc *crtc)
 	kfree(crtc);
 }
 
+static struct drm_crtc_state *
+ast_crtc_atomic_duplicate_state(struct drm_crtc *crtc)
+{
+	struct ast_crtc_state *new_ast_state;
+
+	if (WARN_ON(!crtc->state))
+		return NULL;
+
+	new_ast_state = kmalloc(sizeof(*new_ast_state), GFP_KERNEL);
+	if (!new_ast_state)
+		return NULL;
+	__drm_atomic_helper_crtc_duplicate_state(crtc, &new_ast_state->base);
+
+	return &new_ast_state->base;
+}
+
+static void ast_crtc_atomic_destroy_state(struct drm_crtc *crtc,
+					  struct drm_crtc_state *state)
+{
+	struct ast_crtc_state *ast_state = to_ast_crtc_state(state);
+
+	__drm_atomic_helper_crtc_destroy_state(&ast_state->base);
+	kfree(ast_state);
+}
+
 static const struct drm_crtc_funcs ast_crtc_funcs = {
 	.reset = drm_atomic_helper_crtc_reset,
 	.set_config = drm_crtc_helper_set_config,
 	.gamma_set = drm_atomic_helper_legacy_gamma_set,
 	.destroy = ast_crtc_destroy,
 	.set_config = drm_atomic_helper_set_config,
 	.page_flip = drm_atomic_helper_page_flip,
-	.atomic_duplicate_state = drm_atomic_helper_crtc_duplicate_state,
-	.atomic_destroy_state = drm_atomic_helper_crtc_destroy_state,
+	.atomic_duplicate_state = ast_crtc_atomic_duplicate_state,
+	.atomic_destroy_state = ast_crtc_atomic_destroy_state,
 };
 
 static int ast_crtc_init(struct drm_device *dev)