Re: [PATCH] usb: xhci-pci: Disable 64-bit DMA for VIA VL805

[Xincheng Zhang]

Hi Michal,

On 2026-06-23 12:18 +0200, Michal Pecio wrote:
> But I don't like this abuse of the quirk. Firstly, it causes
> unnecessary bouncing on systems with >4GB RAM and no IOMMU.
> I found other drivers that use DMA_BIT_MASK(36) or even weirder
> numbers, so it seems that we too could request 64 gigs exactly
> with a bit of driver refactoring.

Thanks for the review. I totally agree that using `DMA_BIT_MASK(36)` is
a much better approach to avoid bounce buffers and register width issues. 

I will prepare a v2 patch with this refactoring. I'll wait a bit for
Forest's input on the ASMedia chips before sending it out, just in case 
we need to handle them together.

Thanks,
Xincheng