diff options
| author | Jammy Huang <jammy_huang@aspeedtech.com> | 2023-04-21 03:33:54 +0300 |
|---|---|---|
| committer | Thomas Zimmermann <tzimmermann@suse.de> | 2023-04-21 10:42:01 +0300 |
| commit | 4327a6137ed43a091d900b1ac833345d60f32228 (patch) | |
| tree | 308f1e199a699fc118750622743a55dd03ec0ae7 /drivers/gpu/drm/ast | |
| parent | b63a553e8f5aa6574eeb535a551817a93c426d8c (diff) | |
| download | linux-4327a6137ed43a091d900b1ac833345d60f32228.tar.xz | |
drm/ast: Fix ARM compatibility
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
Diffstat (limited to 'drivers/gpu/drm/ast')
| -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 f83ce77127cb..a6d0ee4da2b8 100644 --- a/drivers/gpu/drm/ast/ast_main.c +++ b/drivers/gpu/drm/ast/ast_main.c @@ -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; } |