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drm/ast: Fix ARM compatibility

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[ Upstream commit 4327a6137ed43a091d900b1ac833345d60f32228 ]

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

Signed-off-by: Jammy Huang <jammy_huang@aspeedtech.com>
Reviewed-by: Thomas Zimmermann <tzimmermann@suse.de>
Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Link: https://patchwork.freedesktop.org/patch/msgid/20230421003354.27767-1-jammy_huang@aspeedtech.com
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Jammy Huang 2023-04-21 08:33:54 +08:00 committed by Greg Kroah-Hartman
parent cad1abbe48
commit e2d161c539
1 changed files with 5 additions and 4 deletions
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9
drivers/gpu/drm/ast/ast_main.c
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@ -427,11 +427,12 @@ 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;
}