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path: root/drivers/usb/host/xhci-hub.c
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Diffstat (limited to 'drivers/usb/host/xhci-hub.c')
-rw-r--r--drivers/usb/host/xhci-hub.c38
1 files changed, 36 insertions, 2 deletions
diff --git a/drivers/usb/host/xhci-hub.c b/drivers/usb/host/xhci-hub.c
index a686cf4905bb..68914429482f 100644
--- a/drivers/usb/host/xhci-hub.c
+++ b/drivers/usb/host/xhci-hub.c
@@ -761,12 +761,39 @@ int xhci_hub_control(struct usb_hcd *hcd, u16 typeReq, u16 wValue,
break;
case USB_PORT_FEAT_LINK_STATE:
temp = xhci_readl(xhci, port_array[wIndex]);
+
+ /* Disable port */
+ if (link_state == USB_SS_PORT_LS_SS_DISABLED) {
+ xhci_dbg(xhci, "Disable port %d\n", wIndex);
+ temp = xhci_port_state_to_neutral(temp);
+ /*
+ * Clear all change bits, so that we get a new
+ * connection event.
+ */
+ temp |= PORT_CSC | PORT_PEC | PORT_WRC |
+ PORT_OCC | PORT_RC | PORT_PLC |
+ PORT_CEC;
+ xhci_writel(xhci, temp | PORT_PE,
+ port_array[wIndex]);
+ temp = xhci_readl(xhci, port_array[wIndex]);
+ break;
+ }
+
+ /* Put link in RxDetect (enable port) */
+ if (link_state == USB_SS_PORT_LS_RX_DETECT) {
+ xhci_dbg(xhci, "Enable port %d\n", wIndex);
+ xhci_set_link_state(xhci, port_array, wIndex,
+ link_state);
+ temp = xhci_readl(xhci, port_array[wIndex]);
+ break;
+ }
+
/* Software should not attempt to set
- * port link state above '5' (Rx.Detect) and the port
+ * port link state above '3' (U3) and the port
* must be enabled.
*/
if ((temp & PORT_PE) == 0 ||
- (link_state > USB_SS_PORT_LS_RX_DETECT)) {
+ (link_state > USB_SS_PORT_LS_U3)) {
xhci_warn(xhci, "Cannot set link state.\n");
goto error;
}
@@ -957,6 +984,7 @@ int xhci_hub_status_data(struct usb_hcd *hcd, char *buf)
int max_ports;
__le32 __iomem **port_array;
struct xhci_bus_state *bus_state;
+ bool reset_change = false;
max_ports = xhci_get_ports(hcd, &port_array);
bus_state = &xhci->bus_state[hcd_index(hcd)];
@@ -988,6 +1016,12 @@ int xhci_hub_status_data(struct usb_hcd *hcd, char *buf)
buf[(i + 1) / 8] |= 1 << (i + 1) % 8;
status = 1;
}
+ if ((temp & PORT_RC))
+ reset_change = true;
+ }
+ if (!status && !reset_change) {
+ xhci_dbg(xhci, "%s: stopping port polling.\n", __func__);
+ clear_bit(HCD_FLAG_POLL_RH, &hcd->flags);
}
spin_unlock_irqrestore(&xhci->lock, flags);
return status ? retval : 0;
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