usb: xhci: fix interrupt transfer error happened on MTK platforms

BugLink: https://bugs.launchpad.net/bugs/1836117
commit 0a3b53305c8ff427bbc1d9d5bd78524007f19600 upstream.

The MTK xHCI controller use some reserved bytes in endpoint context for
bandwidth scheduling, so need keep them in xhci_endpoint_copy();

The issue is introduced by:
commit f5249461b504 ("xhci: Clear the host side toggle manually when
endpoint is soft reset")
It resets endpoints and will drop bandwidth scheduling parameters used
by interrupt or isochronous endpoints on MTK xHCI controller.
Fixes: f5249461b504 ("xhci: Clear the host side toggle manually when
endpoint is soft reset")

Cc: stable@vger.kernel.org
Signed-off-by: Chunfeng Yun <chunfeng.yun@mediatek.com>
Tested-by: Sean Wang <sean.wang@mediatek.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Kamal Mostafa <kamal@canonical.com>
Signed-off-by: Kleber Sacilotto de Souza <kleber.souza@canonical.com>

diff --git a/drivers/usb/host/xhci-mem.c b/drivers/usb/host/xhci-mem.c
index 37516897b14f4630fd65b7ede4e47a90adec4270..7ba3d4cab8f6ac8157f38154a399b95c1bba6417 100644 (file)
--- a/drivers/usb/host/xhci-mem.c
+++ b/drivers/usb/host/xhci-mem.c
@@ -1606,6 +1606,10 @@ void xhci_endpoint_copy(struct xhci_hcd *xhci,
        in_ep_ctx->ep_info2 = out_ep_ctx->ep_info2;
        in_ep_ctx->deq = out_ep_ctx->deq;
        in_ep_ctx->tx_info = out_ep_ctx->tx_info;
+       if (xhci->quirks & XHCI_MTK_HOST) {
+               in_ep_ctx->reserved[0] = out_ep_ctx->reserved[0];
+               in_ep_ctx->reserved[1] = out_ep_ctx->reserved[1];
+       }
 }
 
 /* Copy output xhci_slot_ctx to the input xhci_slot_ctx.