| 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 01/19] 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 | 3 +++ |
| 1 file changed, 3 insertions(+) |
| |
| diff --git a/drivers/usb/host/xhci.c b/drivers/usb/host/xhci.c |
| index bad154f446f8..19a9bde309a6 100644 |
| --- a/drivers/usb/host/xhci.c |
| +++ b/drivers/usb/host/xhci.c |
| @@ -789,6 +789,9 @@ void xhci_shutdown(struct usb_hcd *hcd) |
| xhci_dbg_trace(xhci, trace_xhci_dbg_init, |
| "xhci_shutdown completed - status = %x", |
| readl(&xhci->op_regs->status)); |
| + |
| + /* TI XHCI controllers do not come back after kexec without this hack */ |
| + pci_reset_function_locked(to_pci_dev(hcd->self.sysdev)); |
| } |
| EXPORT_SYMBOL_GPL(xhci_shutdown); |
| |