drm/ast: Retrieve I/O-memory ranges without ast device

Read the I/O-memory ranges into local variables before setting
them in the ast device instanace. We'll later need this to split
detecting the device type from the creation of the ast device
instance.
Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Reviewed-by: Jocelyn Falempe <jfalempe@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20231116100240.22975-4-tzimmermann@suse.de

drivers/gpu/drm/ast/ast_main.c

@@ -432,6 +432,8 @@ struct ast_device *ast_device_create(const struct drm_driver *drv,
 	struct ast_device *ast;
 	bool need_post = false;
 	int ret = 0;
+	void __iomem *regs;
+	void __iomem *ioregs;
 
 	ast = devm_drm_dev_alloc(&pdev->dev, drv, struct ast_device, base);
 	if (IS_ERR(ast))
@@ -440,8 +442,8 @@ struct ast_device *ast_device_create(const struct drm_driver *drv,
 
 	pci_set_drvdata(pdev, dev);
 
-	ast->regs = pcim_iomap(pdev, 1, 0);
-	if (!ast->regs)
+	regs = pcim_iomap(pdev, 1, 0);
+	if (!regs)
 		return ERR_PTR(-EIO);
 
 	if (pdev->revision >= 0x40) {
@@ -455,7 +457,7 @@ struct ast_device *ast_device_create(const struct drm_driver *drv,
 			return ERR_PTR(-EIO);
 		if ((len - AST_IO_MM_OFFSET) < AST_IO_MM_LENGTH)
 			return ERR_PTR(-EIO);
-		ast->ioregs = ast->regs + AST_IO_MM_OFFSET;
+		ioregs = regs + AST_IO_MM_OFFSET;
 	} else if (pci_resource_flags(pdev, 2) & IORESOURCE_IO) {
 		/*
 		 * Map I/O registers if we have a PCI BAR for I/O.
@@ -464,8 +466,8 @@ struct ast_device *ast_device_create(const struct drm_driver *drv,
 
 		if (len < AST_IO_MM_LENGTH)
 			return -EIO;
-		ast->ioregs = pcim_iomap(pdev, 2, 0);
-		if (!ast->ioregs)
+		ioregs = pcim_iomap(pdev, 2, 0);
+		if (!ioregs)
 			return ERR_PTR(-EIO);
 	} else {
 		/*
@@ -477,11 +479,14 @@ struct ast_device *ast_device_create(const struct drm_driver *drv,
 			return ERR_PTR(-EIO);
 		if ((len - AST_IO_MM_OFFSET) < AST_IO_MM_LENGTH)
 			return ERR_PTR(-EIO);
-		ast->ioregs = ast->regs + AST_IO_MM_OFFSET;
+		ioregs = regs + AST_IO_MM_OFFSET;
 
 		drm_info(dev, "Platform has no I/O space, using MMIO\n");
 	}
 
+	ast->regs = regs;
+	ast->ioregs = ioregs;
+
 	if (!ast_is_vga_enabled(dev)) {
 		drm_info(dev, "VGA not enabled on entry, requesting chip POST\n");
 		need_post = true;