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| author | Jammy Huang <jammy_huang@aspeedtech.com> | 2023-04-21 08:33:54 +0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2023-06-09 10:32:20 +0200 |
| commit | 872a038dd4c914ed37e59acb5b7b61ac4c448bad (patch) | |
| tree | 30ee091a997748ae755ccaa826a066bc56423c74 | |
| parent | 3291f4a1073ac2822192fdcbe1009901a15dc864 (diff) | |
| download | linux-stable-872a038dd4c914ed37e59acb5b7b61ac4c448bad.tar.gz linux-stable-872a038dd4c914ed37e59acb5b7b61ac4c448bad.tar.bz2 linux-stable-872a038dd4c914ed37e59acb5b7b61ac4c448bad.zip | |
drm/ast: Fix ARM compatibility
[ 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>
| -rw-r--r-- | drivers/gpu/drm/ast/ast_main.c | 9 |
1 files changed, 5 insertions, 4 deletions
diff --git a/drivers/gpu/drm/ast/ast_main.c b/drivers/gpu/drm/ast/ast_main.c index 79a361867955..754a08c92d3d 100644 --- a/drivers/gpu/drm/ast/ast_main.c +++ b/drivers/gpu/drm/ast/ast_main.c @@ -423,11 +423,12 @@ 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; } |