xhci: dbc: enable back DbC in resume if it was enabled before suspend

commit 2bbd38fcd29670e46c0fdb9cd0e90507a8a1bf6a upstream.

DbC is currently only enabled back if it's in configured state during
suspend.

If system is suspended after DbC is enabled, but before the device is
properly enumerated by the host, then DbC would not be enabled back in
resume.

Always enable DbC back in resume if it's suspended in enabled,
connected, or configured state

Cc: stable <stable@kernel.org>
Fixes: dfba2174dc42 ("usb: xhci: Add DbC support in xHCI driver")
Tested-by: Łukasz Bartosik <ukaszb@chromium.org>
Signed-off-by: Mathias Nyman <mathias.nyman@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/usb/host/xhci-dbgcap.c b/drivers/usb/host/xhci-dbgcap.c
index 123506681ef0a47d4d43190788d92fdddcb439bc..729235c7f282ad1c22c771df3a6726c9c2431d96 100644 (file)
--- a/drivers/usb/host/xhci-dbgcap.c
+++ b/drivers/usb/host/xhci-dbgcap.c
@@ -1387,8 +1387,15 @@ int xhci_dbc_suspend(struct xhci_hcd *xhci)
        if (!dbc)
                return 0;
 
-       if (dbc->state == DS_CONFIGURED)
+       switch (dbc->state) {
+       case DS_ENABLED:
+       case DS_CONNECTED:
+       case DS_CONFIGURED:
                dbc->resume_required = 1;
+               break;
+       default:
+               break;
+       }
 
        xhci_dbc_stop(dbc);