| Klaus Heinrich Kiwi | 7aa26cd | 2020-09-24 12:18:00 -0500 | [diff] [blame] | 1 | From eb9ba66045e92706878d619e0b8c94669cc993f9 Mon Sep 17 00:00:00 2001 |
| 2 | From: Brian King <brking@linux.vnet.ibm.com> |
| 3 | Date: Wed, 25 Oct 2017 10:42:59 +1100 |
| 4 | Subject: [PATCH 1/2] xhci: Reset controller on xhci shutdown |
| 5 | |
| 6 | Fixes kexec boot. Without a hard reset, some USB chips will fail to |
| 7 | initialize in a kexec booted kernel. |
| 8 | |
| 9 | Signed-off-by: Brian King <brking@linux.vnet.ibm.com> |
| 10 | Signed-off-by: Samuel Mendoza-Jonas <sam@mendozajonas.com> |
| 11 | Signed-off-by: Joel Stanley <joel@jms.id.au> |
| 12 | --- |
| 13 | drivers/usb/host/xhci.c | 3 +++ |
| 14 | 1 file changed, 3 insertions(+) |
| 15 | |
| 16 | diff --git a/drivers/usb/host/xhci.c b/drivers/usb/host/xhci.c |
| 17 | index ed468ee..e881cde 100644 |
| 18 | --- a/drivers/usb/host/xhci.c |
| 19 | +++ b/drivers/usb/host/xhci.c |
| 20 | @@ -789,6 +789,9 @@ void xhci_shutdown(struct usb_hcd *hcd) |
| 21 | xhci_dbg_trace(xhci, trace_xhci_dbg_init, |
| 22 | "xhci_shutdown completed - status = %x", |
| 23 | readl(&xhci->op_regs->status)); |
| 24 | + |
| 25 | + /* TI XHCI controllers do not come back after kexec without this hack */ |
| 26 | + pci_reset_function_locked(to_pci_dev(hcd->self.sysdev)); |
| 27 | } |
| 28 | EXPORT_SYMBOL_GPL(xhci_shutdown); |
| 29 | |
| 30 | -- |
| 31 | 1.9.4 |
| 32 | |