[PATCH] drm/ast: Fix ARM compatibility
Thomas Zimmermann
tzimmermann at suse.de
Mon Apr 17 11:51:36 UTC 2023
Hi
Am 07.04.23 um 04:09 schrieb Jammy Huang:
> Hi Thomas,
>
> Could you help review this patch??
>
> We met some problem on nvidia's ARM platfrom and need this patch to fix it.
>
> On 2023/3/2 上午 10:19, Jammy Huang wrote:
>> ARM architecture only has 'memory', so all devices are accessed by MMIO.
>>
>> Signed-off-by: Jammy Huang <jammy_huang at aspeedtech.com>
>> ---
>> drivers/gpu/drm/ast/ast_main.c | 17 +----------------
>> 1 file changed, 1 insertion(+), 16 deletions(-)
>>
>> diff --git a/drivers/gpu/drm/ast/ast_main.c
>> b/drivers/gpu/drm/ast/ast_main.c
>> index 794ffd4a29c5..f86d01e9f024 100644
>> --- a/drivers/gpu/drm/ast/ast_main.c
>> +++ b/drivers/gpu/drm/ast/ast_main.c
>> @@ -424,22 +424,7 @@ struct ast_device *ast_device_create(const struct
>> drm_driver *drv,
>> if (!ast->regs)
>> 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).
>> - */
>> - 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;
>> - }
>> -
>> - /* "map" IO regs if the above hasn't done so already */
>> - if (!ast->ioregs) {
>> - ast->ioregs = pcim_iomap(pdev, 2, 0);
What happens on systems that use this branch?
Best regards
Thomas
>> - if (!ast->ioregs)
>> - return ERR_PTR(-EIO);
>> - }
>> + ast->ioregs = ast->regs + AST_IO_MM_OFFSET;
>> ast_detect_chip(dev, &need_post);
>>
>> base-commit: 254986e324add8a30d0019c6da59f81adc8b565f
>
--
Thomas Zimmermann
Graphics Driver Developer
SUSE Software Solutions Germany GmbH
Maxfeldstr. 5, 90409 Nürnberg, Germany
(HRB 36809, AG Nürnberg)
Geschäftsführer: Ivo Totev
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