drm/ast: Move Gen7+ POST code to separate source file

Move POST code for Gen7+ to separate source file and hide it in
ast_2600_post(). There's not much going on here except for enabling
the DP transmitter chip.

v2:
- simplify logic (Jocelyn)

Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Reviewed-by: Jocelyn Falempe <jfalempe@redhat.com>
Link: https://lore.kernel.org/r/20250706162816.211552-3-tzimmermann@suse.de

Author: tdz

drivers/gpu/drm/ast/Makefile

@@ -4,6 +4,7 @@
 # Direct Rendering Infrastructure (DRI) in XFree86 4.1.0 and higher.
 
 ast-y := \
+	ast_2600.o \
 	ast_cursor.o \
 	ast_ddc.o \
 	ast_dp501.o \

drivers/gpu/drm/ast/ast_2600.c

@@ -0,0 +1,41 @@
+// SPDX-License-Identifier: MIT
+/*
+ * Copyright 2012 Red Hat Inc.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sub license, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
+ * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
+ * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
+ * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
+ * USE OR OTHER DEALINGS IN THE SOFTWARE.
+ *
+ * The above copyright notice and this permission notice (including the
+ * next paragraph) shall be included in all copies or substantial portions
+ * of the Software.
+ */
+/*
+ * Authors: Dave Airlie <airlied@redhat.com>
+ */
+
+#include "ast_drv.h"
+
+/*
+ * POST
+ */
+
+int ast_2600_post(struct ast_device *ast)
+{
+	if (ast->tx_chip == AST_TX_ASTDP)
+		return ast_dp_launch(ast);
+
+	return 0;
+}

drivers/gpu/drm/ast/ast_drv.h

@@ -417,6 +417,9 @@ struct ast_crtc_state {
 
 int ast_mm_init(struct ast_device *ast);
 
+/* ast_2600.c */
+int ast_2600_post(struct ast_device *ast);
+
 /* ast post */
 int ast_post_gpu(struct ast_device *ast);
 u32 ast_mindwm(struct ast_device *ast, u32 r);

drivers/gpu/drm/ast/ast_post.c

@@ -348,11 +348,9 @@ int ast_post_gpu(struct ast_device *ast)
 	ast_set_def_ext_reg(ast);
 
 	if (AST_GEN(ast) >= 7) {
-		if (ast->tx_chip == AST_TX_ASTDP) {
-			ret = ast_dp_launch(ast);
-			if (ret)
-				return ret;
-		}
+		ret = ast_2600_post(ast);
+		if (ret)
+			return ret;
 	} else if (AST_GEN(ast) >= 6) {
 		if (ast->config_mode == ast_use_p2a) {
 			ast_post_chip_2500(ast);