xHCI: warm reset support

This patch adds warm reset support to xhci hub control.
It handles Set Port Feature(BH_PORT_RESET) and Clear Port Feature
(C_BH_PORT_RESET) request from usbcore.
Note warm reset is called BH reset some places in USB3.0 specification.

Signed-off-by: Andiry Xu <andiry.xu@amd.com>
Signed-off-by: Sarah Sharp <sarah.a.sharp@linux.intel.com>

1 files changed, 11 insertions, 0 deletions

diff --git a/drivers/usb/host/xhci-hub.c b/drivers/usb/host/xhci-hub.c
index ae1d24cb9303..1ab7f2e2c05f 100644
--- a/drivers/usb/host/xhci-hub.c
+++ b/drivers/usb/host/xhci-hub.c
@@ -341,6 +341,10 @@ static void xhci_clear_port_change_bit(struct xhci_hcd *xhci, u16 wValue,
                 status = PORT_RC;
                 port_change_bit = "reset";
                 break;
+        case USB_PORT_FEAT_C_BH_PORT_RESET:
+                status = PORT_WRC;
+                port_change_bit = "warm(BH) reset";
+                break;
         case USB_PORT_FEAT_C_CONNECTION:
                 status = PORT_CSC;
                 port_change_bit = "connect";
@@ -557,6 +561,12 @@ int xhci_hub_control(struct usb_hcd *hcd, u16 typeReq, u16 wValue,
                         temp = xhci_readl(xhci, port_array[wIndex]);
                         xhci_dbg(xhci, "set port reset, actual port %d status  = 0x%x\n", wIndex, temp);
                         break;
+                case USB_PORT_FEAT_BH_PORT_RESET:
+                        temp |= PORT_WR;
+                        xhci_writel(xhci, temp, port_array[wIndex]);
+
+                        temp = xhci_readl(xhci, port_array[wIndex]);
+                        break;
                 default:
                         goto error;
                 }
@@ -625,6 +635,7 @@ int xhci_hub_control(struct usb_hcd *hcd, u16 typeReq, u16 wValue,
                 case USB_PORT_FEAT_C_SUSPEND:
                         bus_state->port_c_suspend &= ~(1 << wIndex);
                 case USB_PORT_FEAT_C_RESET:
+                case USB_PORT_FEAT_C_BH_PORT_RESET:
                 case USB_PORT_FEAT_C_CONNECTION:
                 case USB_PORT_FEAT_C_OVER_CURRENT:
                 case USB_PORT_FEAT_C_ENABLE: