[PATCH v2 06/10] drm/ast: Enable MMIO without ast device instance

[Thomas Zimmermann <tzimmermann@xxxxxxx>]

We'll have to enable the MMIO access for detecting the ast device
type. Make this work without an instance of the ast device.

Signed-off-by: Thomas Zimmermann <tzimmermann@xxxxxxx>
Reviewed-by: Jocelyn Falempe <jfalempe@xxxxxxxxxx>
---
 drivers/gpu/drm/ast/ast_main.c | 16 +++++++++-------
 drivers/gpu/drm/ast/ast_reg.h  |  2 ++
 2 files changed, 11 insertions(+), 7 deletions(-)

diff --git a/drivers/gpu/drm/ast/ast_main.c b/drivers/gpu/drm/ast/ast_main.c
index 82fcee967d984..0173cb44f17de 100644
--- a/drivers/gpu/drm/ast/ast_main.c
+++ b/drivers/gpu/drm/ast/ast_main.c
@@ -54,19 +54,21 @@ static void ast_enable_vga(void __iomem *ioregs)
  */
 static void ast_enable_mmio_release(void *data)
 {
-	struct ast_device *ast = data;
+	void __iomem *ioregs = (void __force __iomem *)data;
 
 	/* enable standard VGA decode */
-	ast_set_index_reg(ast, AST_IO_VGACRI, 0xa1, 0x04);
+	__ast_write8_i(ioregs, AST_IO_VGACRI, 0xa1, AST_IO_VGACRA1_MMIO_ENABLED);
 }
 
-static int ast_enable_mmio(struct ast_device *ast)
+static int ast_enable_mmio(struct device *dev, void __iomem *ioregs)
 {
-	struct drm_device *dev = &ast->base;
+	void *data = (void __force *)ioregs;
 
-	ast_set_index_reg(ast, AST_IO_VGACRI, 0xa1, 0x06);
+	__ast_write8_i(ioregs, AST_IO_VGACRI, 0xa1,
+		       AST_IO_VGACRA1_MMIO_ENABLED |
+		       AST_IO_VGACRA1_VGAIO_DISABLED);
 
-	return devm_add_action_or_reset(dev->dev, ast_enable_mmio_release, ast);
+	return devm_add_action_or_reset(dev, ast_enable_mmio_release, data);
 }
 
 static void ast_open_key(void __iomem *ioregs)
@@ -496,7 +498,7 @@ struct ast_device *ast_device_create(const struct drm_driver *drv,
 	/* Enable extended register access */
 	ast_open_key(ioregs);
 
-	ret = ast_enable_mmio(ast);
+	ret = ast_enable_mmio(&pdev->dev, ioregs);
 	if (ret)
 		return ERR_PTR(ret);
 
diff --git a/drivers/gpu/drm/ast/ast_reg.h b/drivers/gpu/drm/ast/ast_reg.h
index 5258a84ef3a6f..62dddbf3fe569 100644
--- a/drivers/gpu/drm/ast/ast_reg.h
+++ b/drivers/gpu/drm/ast/ast_reg.h
@@ -29,6 +29,8 @@
 
 #define AST_IO_VGACRI			(0x54)
 #define AST_IO_VGACR80_PASSWORD		(0xa8)
+#define AST_IO_VGACRA1_VGAIO_DISABLED	BIT(1)
+#define AST_IO_VGACRA1_MMIO_ENABLED	BIT(2)
 #define AST_IO_VGACRCB_HWC_16BPP	BIT(0) /* set: ARGB4444, cleared: 2bpp palette */
 #define AST_IO_VGACRCB_HWC_ENABLED	BIT(1)
 
-- 
2.42.0