usb: xhci-mem: Fix scratchpad array issue

After updating the value of dev_context_ptrs[0], we should flush this
from cache to memory. Otherwise the xhci controller won't use it.

Signed-off-by: Ye Li <[email protected]>
Reviewed-by: Marek Vasut <[email protected]>

diff --git a/drivers/usb/host/xhci-mem.c b/drivers/usb/host/xhci-mem.c
index 04ab540695be69cbc0a236b6d246e6bd56fe7300..84c2c3344adc1792877b6f53307ee3181e19e926 100644 (file)
--- a/drivers/usb/host/xhci-mem.c
+++ b/drivers/usb/host/xhci-mem.c
@@ -369,6 +369,9 @@ static int xhci_scratchpad_alloc(struct xhci_ctrl *ctrl)
        ctrl->dcbaa->dev_context_ptrs[0] =
                cpu_to_le64((uintptr_t)scratchpad->sp_array);
 
+       xhci_flush_cache((uintptr_t)&ctrl->dcbaa->dev_context_ptrs[0],
+               sizeof(ctrl->dcbaa->dev_context_ptrs[0]));
+
        page_size = xhci_readl(&hcor->or_pagesize) & 0xffff;
        for (i = 0; i < 16; i++) {
                if ((0x1 & page_size) != 0)