Commit 4327a613 authored by Jammy Huang's avatar Jammy Huang Committed by Thomas Zimmermann
Browse files

drm/ast: Fix ARM compatibility 



ARM architecture only has 'memory', so all devices are accessed by
MMIO if possible.

Signed-off-by: default avatarJammy Huang <jammy_huang@aspeedtech.com>
Reviewed-by: default avatarThomas Zimmermann <tzimmermann@suse.de>
Signed-off-by: default avatarThomas Zimmermann <tzimmermann@suse.de>
Link: https://patchwork.freedesktop.org/patch/msgid/20230421003354.27767-1-jammy_huang@aspeedtech.com
parent b63a553e

drivers/gpu/drm/ast/ast_main.c

+5 −4
Original line number Diff line number Diff line
@@ -425,11 +425,12 @@ struct ast_private *ast_device_create(const struct drm_driver *drv, 
		return ERR_PTR(-EIO);



	/*

	 * If we don't have IO space at all, use MMIO now and

	 * assume the chip has MMIO enabled by default (rev 0x20

	 * and higher).

	 * After AST2500, MMIO is enabled by default, and it should be adopted

	 * to be compatible with Arm.

	 */

	if (!(pci_resource_flags(pdev, 2) & IORESOURCE_IO)) {

	if (pdev->revision >= 0x40) {

		ast->ioregs = ast->regs + AST_IO_MM_OFFSET;

	} else if (!(pci_resource_flags(pdev, 2) & IORESOURCE_IO)) {

		drm_info(dev, "platform has no IO space, trying MMIO\n");

		ast->ioregs = ast->regs + AST_IO_MM_OFFSET;

	}