[PATCH 5/8] xhci: move usb2 speficic bits to own function in get_port_status call

[Mathias Nyman <mathias.nyman@xxxxxxxxxxxxxxx>]

Mostly refactoring, with the exception that USB_PORT_STAT_L1 link state
is reported if xhci port link is in U2 AND port is powered.

Previously we did not check if the port was powered, but according to
xhci spec 4.19.1.1.6 All the 'Enabled' states, including
USB_PORT_STAT_L1 (U2), U1, U0 and U3 must have Port power bit set.

Signed-off-by: Mathias Nyman <mathias.nyman@xxxxxxxxxxxxxxx>
---
 drivers/usb/host/xhci-hub.c | 44 ++++++++++++++++++++++++--------------------
 1 file changed, 24 insertions(+), 20 deletions(-)

diff --git a/drivers/usb/host/xhci-hub.c b/drivers/usb/host/xhci-hub.c
index 60aeff3..5af4f90 100644
--- a/drivers/usb/host/xhci-hub.c
+++ b/drivers/usb/host/xhci-hub.c
@@ -714,13 +714,6 @@ void xhci_test_and_clear_bit(struct xhci_hcd *xhci, struct xhci_port *port,
 	}
 }
 
-/* Updates Link Status for USB 2.1 port */
-static void xhci_hub_report_usb2_link_state(u32 *status, u32 status_reg)
-{
-	if ((status_reg & PORT_PLS_MASK) == XDEV_U2)
-		*status |= USB_PORT_STAT_L1;
-}
-
 /* Updates Link Status for super Speed port */
 static void xhci_hub_report_usb3_link_state(struct xhci_hcd *xhci,
 		u32 *status, u32 status_reg)
@@ -853,6 +846,25 @@ static void xhci_get_usb3_port_status(struct xhci_port *port, u32 *status,
 	xhci_del_comp_mod_timer(xhci, portsc, portnum);
 }
 
+static void xhci_get_usb2_port_status(struct xhci_port *port, u32 *status,
+				      u32 portsc)
+{
+	u32 link_state;
+
+	link_state = portsc & PORT_PLS_MASK;
+
+	/* USB2 wPortStatus bits */
+	if (portsc & PORT_POWER) {
+		*status |= USB_PORT_STAT_POWER;
+
+		/* link state is only valid if port is powered */
+		if (link_state == XDEV_U3)
+			*status |= USB_PORT_STAT_SUSPEND;
+		if (link_state == XDEV_U2)
+			*status |= USB_PORT_STAT_L1;
+	}
+}
+
 /*
  * Converts a raw xHCI port status into the format that external USB 2.0 or USB
  * 3.0 hubs use.
@@ -888,14 +900,13 @@ static u32 xhci_get_port_status(struct usb_hcd *hcd,
 		status |= USB_PORT_STAT_C_OVERCURRENT << 16;
 	if ((raw_port_status & PORT_RC))
 		status |= USB_PORT_STAT_C_RESET << 16;
-	/* USB3.0 only */
+
+	/* USB2 and USB3 specific bits including Port Link State */
 	if (hcd->speed >= HCD_USB3)
 		xhci_get_usb3_port_status(port, &status, raw_port_status);
-	if (hcd->speed < HCD_USB3) {
-		if ((raw_port_status & PORT_PLS_MASK) == XDEV_U3
-				&& (raw_port_status & PORT_POWER))
-			status |= USB_PORT_STAT_SUSPEND;
-	}
+	else
+		xhci_get_usb2_port_status(port, &status, raw_port_status);
+
 	if ((raw_port_status & PORT_PLS_MASK) == XDEV_RESUME &&
 		!DEV_SUPERSPEED_ANY(raw_port_status) && hcd->speed < HCD_USB3) {
 		if ((raw_port_status & PORT_RESET) ||
@@ -1009,13 +1020,6 @@ static u32 xhci_get_port_status(struct usb_hcd *hcd,
 		status |= USB_PORT_STAT_OVERCURRENT;
 	if (raw_port_status & PORT_RESET)
 		status |= USB_PORT_STAT_RESET;
-	if (raw_port_status & PORT_POWER) {
-		if (hcd->speed < HCD_USB3)
-			status |= USB_PORT_STAT_POWER;
-	}
-	/* Update Port Link State */
-	if (hcd->speed < HCD_USB3)
-		xhci_hub_report_usb2_link_state(&status, raw_port_status);
 
 	if (bus_state->port_c_suspend & (1 << wIndex))
 		status |= USB_PORT_STAT_C_SUSPEND << 16;
-- 
2.7.4