[PATCH 03/16] xhci: Add helper to get xhci roothub from hcd

[Kai-Heng Feng]

From: Mathias Nyman <mathias.nyman at linux.intel.com>

BugLink: https://bugs.launchpad.net/bugs/1763594

quick way to get the xhci roothub and thus all the ports
belonging to a certain hcd

Signed-off-by: Mathias Nyman <mathias.nyman at linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh at linuxfoundation.org>
(cherry picked from commit ffd4b4fc0b9a1526b64240676d309506b2d5eceb)
Signed-off-by: Kai-Heng Feng <kai.heng.feng at canonical.com>
---
 drivers/usb/host/xhci-hub.c | 9 +++++++++
 drivers/usb/host/xhci.h     | 2 ++
 2 files changed, 11 insertions(+)

diff --git a/drivers/usb/host/xhci-hub.c b/drivers/usb/host/xhci-hub.c
index 2a90229be7a6..119f594d1d27 100644
--- a/drivers/usb/host/xhci-hub.c
+++ b/drivers/usb/host/xhci-hub.c
@@ -555,6 +555,15 @@ static int xhci_get_ports(struct usb_hcd *hcd, __le32 __iomem ***port_array)
 	return max_ports;
 }
 
+struct xhci_hub *xhci_get_rhub(struct usb_hcd *hcd)
+{
+	struct xhci_hcd	*xhci = hcd_to_xhci(hcd);
+
+	if (hcd->speed >= HCD_USB3)
+		return &xhci->usb3_rhub;
+	return &xhci->usb2_rhub;
+}
+
 static __le32 __iomem *xhci_get_port_io_addr(struct usb_hcd *hcd, int index)
 {
 	__le32 __iomem **port_array;
diff --git a/drivers/usb/host/xhci.h b/drivers/usb/host/xhci.h
index faacd9bbc1ed..59c7ff346d9b 100644
--- a/drivers/usb/host/xhci.h
+++ b/drivers/usb/host/xhci.h
@@ -2108,6 +2108,8 @@ int xhci_hub_control(struct usb_hcd *hcd, u16 typeReq, u16 wValue, u16 wIndex,
 		char *buf, u16 wLength);
 int xhci_hub_status_data(struct usb_hcd *hcd, char *buf);
 int xhci_find_raw_port_number(struct usb_hcd *hcd, int port1);
+struct xhci_hub *xhci_get_rhub(struct usb_hcd *hcd);
+
 void xhci_hc_died(struct xhci_hcd *xhci);
 
 #ifdef CONFIG_PM
-- 
2.17.1