[RFC PATCH 6/9] usb: xhci: Allow accessing 64-bit registers with DWORD accesses only

Sylwester Nawrocki s.nawrocki at samsung.com
Wed Apr 22 15:37:35 CEST 2020

Hi Bin,

On 22.04.2020 08:00, Bin Meng wrote:
> On Wed, Apr 22, 2020 at 12:51 AM Sylwester Nawrocki
> <s.nawrocki at samsung.com> wrote:
>> So far I couldn't come up with anything better to make the xHCI host
>> controller working on the rpi4 board. For some reason dereferencing
>> a 64-bit pointer to access 64-bit registers doesn't work there,
>> might be a limitation of the PCIe bridge behind the SCB. In Linux
>> always 2 double word accesses are used.
> If Linux always uses 2 double word accesses, let's simply do the same
> in U-Boot by removing the readq/writeq.

Thanks for your review. That sounds good to me, I will do it that way
in next iteration.


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