diff --git a/drivers/gpu/drm/ast/ast_drv.c b/drivers/gpu/drm/ast/ast_drv.c
index e1224ef4ad83d..6a2624dc04b4b 100644
--- a/drivers/gpu/drm/ast/ast_drv.c
+++ b/drivers/gpu/drm/ast/ast_drv.c
@@ -138,6 +138,11 @@ static int ast_drm_freeze(struct drm_device *dev)
 
 static int ast_drm_thaw(struct drm_device *dev)
 {
+	struct ast_device *ast = to_ast_device(dev);
+
+	ast_enable_vga(dev);
+	ast_open_key(ast);
+	ast_enable_mmio(ast);
 	ast_post_gpu(dev);
 
 	return drm_mode_config_helper_resume(dev);
diff --git a/drivers/gpu/drm/ast/ast_drv.h b/drivers/gpu/drm/ast/ast_drv.h
index f7053f2972bb9..a3f37c25f7157 100644
--- a/drivers/gpu/drm/ast/ast_drv.h
+++ b/drivers/gpu/drm/ast/ast_drv.h
@@ -340,6 +340,11 @@ 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
@@ -518,6 +523,8 @@ 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);
+int ast_enable_mmio(struct ast_device *ast);
 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);
diff --git a/drivers/gpu/drm/ast/ast_main.c b/drivers/gpu/drm/ast/ast_main.c
index dae365ed39696..9fcd6f8b1bd36 100644
--- a/drivers/gpu/drm/ast/ast_main.c
+++ b/drivers/gpu/drm/ast/ast_main.c
@@ -45,7 +45,7 @@ static bool ast_is_vga_enabled(struct drm_device *dev)
 	return !!(ch & 0x01);
 }
 
-static void ast_enable_vga(struct drm_device *dev)
+void ast_enable_vga(struct drm_device *dev)
 {
 	struct ast_device *ast = to_ast_device(dev);
 
@@ -65,7 +65,7 @@ static void ast_enable_mmio_release(void *data)
 	ast_set_index_reg(ast, AST_IO_CRTC_PORT, 0xa1, 0x04);
 }
 
-static int ast_enable_mmio(struct ast_device *ast)
+int ast_enable_mmio(struct ast_device *ast)
 {
 	struct drm_device *dev = &ast->base;
 
@@ -74,10 +74,6 @@ static int ast_enable_mmio(struct ast_device *ast)
 	return devm_add_action_or_reset(dev->dev, ast_enable_mmio_release, ast);
 }
 
-static void ast_open_key(struct ast_device *ast)
-{
-	ast_set_index_reg(ast, AST_IO_CRTC_PORT, 0x80, 0xA8);
-}
 
 static int ast_device_config_init(struct ast_device *ast)
 {