From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Brian King <brking@linux.vnet.ibm.com>
Date: Wed, 25 Oct 2017 10:42:59 +1100
Subject: [PATCH 1/4] xhci: Reset controller on xhci shutdown

Fixes kexec boot. Without a hard reset, some USB chips will fail to
initialize in a kexec booted kernel.

Signed-off-by: Brian King <brking@linux.vnet.ibm.com>
Signed-off-by: Samuel Mendoza-Jonas <sam@mendozajonas.com>
Signed-off-by: Joel Stanley <joel@jms.id.au>
---
 drivers/usb/host/xhci.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/usb/host/xhci.c b/drivers/usb/host/xhci.c
index b60a02c50b89..e335b35ff3ba 100644
--- a/drivers/usb/host/xhci.c
+++ b/drivers/usb/host/xhci.c
@@ -717,6 +717,7 @@ static void xhci_shutdown(struct usb_hcd *hcd)
 	/* Yet another workaround for spurious wakeups at shutdown with HSW */
 	if (xhci->quirks & XHCI_SPURIOUS_WAKEUP)
 		pci_set_power_state(to_pci_dev(hcd->self.sysdev), PCI_D3hot);
+	pci_reset_function_locked(to_pci_dev(hcd->self.sysdev));
 }
 
 #ifdef CONFIG_PM