drm/ast: Enable and unlock device access early during init

POST and memory management contains code to enable access to the
device's memory spaces. This is too late. Consolidate this code at
the beginning of the device initialization.
Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Reviewed-by: Jocelyn Falempe <jfalempe@redhat.com>
Tested-by: Jocelyn Falempe <jfalempe@redhat.com> # AST2600
Link: https://patchwork.freedesktop.org/patch/msgid/20230621130032.3568-8-tzimmermann@suse.de

drivers/gpu/drm/ast/ast_drv.h

@@ -287,11 +287,6 @@ static inline void ast_set_index_reg_mask(struct ast_device *ast, u32 base, u8 i
 	ast_set_index_reg(ast, base, index, tmp);
 }
 
-static inline void ast_open_key(struct ast_device *ast)
-{
-	ast_set_index_reg(ast, AST_IO_CRTC_PORT, 0x80, 0xA8);
-}
-
 #define AST_VIDMEM_SIZE_8M    0x00800000
 #define AST_VIDMEM_SIZE_16M   0x01000000
 #define AST_VIDMEM_SIZE_32M   0x02000000
@@ -470,9 +465,6 @@ int ast_mode_config_init(struct ast_device *ast);
 int ast_mm_init(struct ast_device *ast);
 
 /* ast post */
-void ast_enable_vga(struct drm_device *dev);
-void ast_enable_mmio(struct drm_device *dev);
-bool ast_is_vga_enabled(struct drm_device *dev);
 void ast_post_gpu(struct drm_device *dev);
 u32 ast_mindwm(struct ast_device *ast, u32 r);
 void ast_moutdwm(struct ast_device *ast, u32 r, u32 v);

drivers/gpu/drm/ast/ast_main.c

@@ -52,6 +52,36 @@ static int ast_init_pci_config(struct pci_dev *pdev)
 	return pcibios_err_to_errno(err);
 }
 
+static bool ast_is_vga_enabled(struct drm_device *dev)
+{
+	struct ast_device *ast = to_ast_device(dev);
+	u8 ch;
+
+	ch = ast_io_read8(ast, AST_IO_VGA_ENABLE_PORT);
+
+	return !!(ch & 0x01);
+}
+
+static void ast_enable_vga(struct drm_device *dev)
+{
+	struct ast_device *ast = to_ast_device(dev);
+
+	ast_io_write8(ast, AST_IO_VGA_ENABLE_PORT, 0x01);
+	ast_io_write8(ast, AST_IO_MISC_PORT_WRITE, 0x01);
+}
+
+static void ast_enable_mmio(struct drm_device *dev)
+{
+	struct ast_device *ast = to_ast_device(dev);
+
+	ast_set_index_reg(ast, AST_IO_CRTC_PORT, 0xa1, 0x06);
+}
+
+static void ast_open_key(struct ast_device *ast)
+{
+	ast_set_index_reg(ast, AST_IO_CRTC_PORT, 0x80, 0xA8);
+}
+
 static void ast_detect_config_mode(struct drm_device *dev, u32 *scu_rev)
 {
 	struct device_node *np = dev->dev->of_node;

drivers/gpu/drm/ast/ast_mm.c

@@ -38,8 +38,6 @@ static u32 ast_get_vram_size(struct ast_device *ast)
 	u8 jreg;
 	u32 vram_size;
 
-	ast_open_key(ast);
-
 	vram_size = AST_VIDMEM_DEFAULT_SIZE;
 	jreg = ast_get_index_reg_mask(ast, AST_IO_CRTC_PORT, 0xaa, 0xff);
 	switch (jreg & 3) {

drivers/gpu/drm/ast/ast_post.c

@@ -37,32 +37,6 @@
 static void ast_post_chip_2300(struct drm_device *dev);
 static void ast_post_chip_2500(struct drm_device *dev);
 
-void ast_enable_vga(struct drm_device *dev)
-{
-	struct ast_device *ast = to_ast_device(dev);
-
-	ast_io_write8(ast, AST_IO_VGA_ENABLE_PORT, 0x01);
-	ast_io_write8(ast, AST_IO_MISC_PORT_WRITE, 0x01);
-}
-
-void ast_enable_mmio(struct drm_device *dev)
-{
-	struct ast_device *ast = to_ast_device(dev);
-
-	ast_set_index_reg(ast, AST_IO_CRTC_PORT, 0xa1, 0x06);
-}
-
-
-bool ast_is_vga_enabled(struct drm_device *dev)
-{
-	struct ast_device *ast = to_ast_device(dev);
-	u8 ch;
-
-	ch = ast_io_read8(ast, AST_IO_VGA_ENABLE_PORT);
-
-	return !!(ch & 0x01);
-}
-
 static const u8 extreginfo[] = { 0x0f, 0x04, 0x1c, 0xff };
 static const u8 extreginfo_ast2300[] = { 0x0f, 0x04, 0x1f, 0xff };
 
@@ -362,9 +336,6 @@ void ast_post_gpu(struct drm_device *dev)
 {
 	struct ast_device *ast = to_ast_device(dev);
 
-	ast_enable_vga(dev);
-	ast_open_key(ast);
-	ast_enable_mmio(dev);
 	ast_set_def_ext_reg(dev);
 
 	if (ast->chip == AST2600) {