[v1,01/10] usb: xhci: Add missing cache flush in the scratchpad array initialization

In current code there is no cache flush after initializing the scratchpad
buffer array with the scratchpad buffer pointers. This leads to a failure
of the "slot enable" command on the rpi4 board (Broadcom STB PCIe
controller + VL805 USB hub) - the very first TRB transfer on the command
ring fails and there is a timeout while waiting for the command completion
event. After adding the missing cache flush everything seems to be working
as expected.

Reviewed-by: Bin Meng <bmeng.cn at gmail.com>
Signed-off-by: Sylwester Nawrocki <s.nawrocki at samsung.com>
---
Changes since RFC:
 - none.
---
 drivers/usb/host/xhci-mem.c | 3 +++
 1 file changed, 3 insertions(+)

On Fri, 2020-04-24 at 18:50 +0200, Sylwester Nawrocki wrote:
> In current code there is no cache flush after initializing the scratchpad
> buffer array with the scratchpad buffer pointers. This leads to a failure
> of the "slot enable" command on the rpi4 board (Broadcom STB PCIe
> controller + VL805 USB hub) - the very first TRB transfer on the command
> ring fails and there is a timeout while waiting for the command completion
> event. After adding the missing cache flush everything seems to be working
> as expected.
> 
> Reviewed-by: Bin Meng <bmeng.cn at gmail.com>
> Signed-off-by: Sylwester Nawrocki <s.nawrocki at samsung.com>

Reviewed-by: Nicolas Saenz Julienne <nsaenzjulienne at suse.de>

Regards,
Nicolas

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