xhci: factor out parts of xhci_gen_setup()

Factoring out parts of xhci_gen_setup() has two motivations:
- When adding functionaliy to omit shared hcd if not needed in a
  subsequent patch, we'll have to call xhci_hcd_init_usb3_data()
  from two places.
- It reduces size of xhci_gen_setup() and makes it better readable.

Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: Mathias Nyman <mathias.nyman@linux.intel.com>
Link: https://lore.kernel.org/r/20220511220450.85367-2-mathias.nyman@linux.intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/usb/host/xhci.c

@@ -5209,6 +5209,57 @@ static int xhci_get_frame(struct usb_hcd *hcd)
 	return readl(&xhci->run_regs->microframe_index) >> 3;
 }
 
+static void xhci_hcd_init_usb2_data(struct xhci_hcd *xhci, struct usb_hcd *hcd)
+{
+	xhci->usb2_rhub.hcd = hcd;
+	hcd->speed = HCD_USB2;
+	hcd->self.root_hub->speed = USB_SPEED_HIGH;
+	/*
+	 * USB 2.0 roothub under xHCI has an integrated TT,
+	 * (rate matching hub) as opposed to having an OHCI/UHCI
+	 * companion controller.
+	 */
+	hcd->has_tt = 1;
+}
+
+static void xhci_hcd_init_usb3_data(struct xhci_hcd *xhci, struct usb_hcd *hcd)
+{
+	unsigned int minor_rev;
+
+	/*
+	 * Early xHCI 1.1 spec did not mention USB 3.1 capable hosts
+	 * should return 0x31 for sbrn, or that the minor revision
+	 * is a two digit BCD containig minor and sub-minor numbers.
+	 * This was later clarified in xHCI 1.2.
+	 *
+	 * Some USB 3.1 capable hosts therefore have sbrn 0x30, and
+	 * minor revision set to 0x1 instead of 0x10.
+	 */
+	if (xhci->usb3_rhub.min_rev == 0x1)
+		minor_rev = 1;
+	else
+		minor_rev = xhci->usb3_rhub.min_rev / 0x10;
+
+	switch (minor_rev) {
+	case 2:
+		hcd->speed = HCD_USB32;
+		hcd->self.root_hub->speed = USB_SPEED_SUPER_PLUS;
+		hcd->self.root_hub->rx_lanes = 2;
+		hcd->self.root_hub->tx_lanes = 2;
+		hcd->self.root_hub->ssp_rate = USB_SSP_GEN_2x2;
+		break;
+	case 1:
+		hcd->speed = HCD_USB31;
+		hcd->self.root_hub->speed = USB_SPEED_SUPER_PLUS;
+		hcd->self.root_hub->ssp_rate = USB_SSP_GEN_2x1;
+		break;
+	}
+	xhci_info(xhci, "Host supports USB 3.%x %sSuperSpeed\n",
+		  minor_rev, minor_rev ? "Enhanced " : "");
+
+	xhci->usb3_rhub.hcd = hcd;
+}
+
 int xhci_gen_setup(struct usb_hcd *hcd, xhci_get_quirks_t get_quirks)
 {
 	struct xhci_hcd		*xhci;
@@ -5217,7 +5268,6 @@ int xhci_gen_setup(struct usb_hcd *hcd, xhci_get_quirks_t get_quirks)
 	 * quirks
 	 */
 	struct device		*dev = hcd->self.sysdev;
-	unsigned int		minor_rev;
 	int			retval;
 
 	/* Accept arbitrarily long scatter-gather lists */
@@ -5232,60 +5282,14 @@ int xhci_gen_setup(struct usb_hcd *hcd, xhci_get_quirks_t get_quirks)
 	xhci = hcd_to_xhci(hcd);
 
 	if (usb_hcd_is_primary_hcd(hcd)) {
-		xhci->main_hcd = hcd;
-		xhci->usb2_rhub.hcd = hcd;
-		/* Mark the first roothub as being USB 2.0.
-		 * The xHCI driver will register the USB 3.0 roothub.
-		 */
-		hcd->speed = HCD_USB2;
-		hcd->self.root_hub->speed = USB_SPEED_HIGH;
-		/*
-		 * USB 2.0 roothub under xHCI has an integrated TT,
-		 * (rate matching hub) as opposed to having an OHCI/UHCI
-		 * companion controller.
-		 */
-		hcd->has_tt = 1;
+		xhci_hcd_init_usb2_data(xhci, hcd);
 	} else {
-		/*
-		 * Early xHCI 1.1 spec did not mention USB 3.1 capable hosts
-		 * should return 0x31 for sbrn, or that the minor revision
-		 * is a two digit BCD containig minor and sub-minor numbers.
-		 * This was later clarified in xHCI 1.2.
-		 *
-		 * Some USB 3.1 capable hosts therefore have sbrn 0x30, and
-		 * minor revision set to 0x1 instead of 0x10.
-		 */
-		if (xhci->usb3_rhub.min_rev == 0x1)
-			minor_rev = 1;
-		else
-			minor_rev = xhci->usb3_rhub.min_rev / 0x10;
-
-		switch (minor_rev) {
-		case 2:
-			hcd->speed = HCD_USB32;
-			hcd->self.root_hub->speed = USB_SPEED_SUPER_PLUS;
-			hcd->self.root_hub->rx_lanes = 2;
-			hcd->self.root_hub->tx_lanes = 2;
-			hcd->self.root_hub->ssp_rate = USB_SSP_GEN_2x2;
-			break;
-		case 1:
-			hcd->speed = HCD_USB31;
-			hcd->self.root_hub->speed = USB_SPEED_SUPER_PLUS;
-			hcd->self.root_hub->ssp_rate = USB_SSP_GEN_2x1;
-			break;
-		}
-		xhci_info(xhci, "Host supports USB 3.%x %sSuperSpeed\n",
-			  minor_rev,
-			  minor_rev ? "Enhanced " : "");
-
-		xhci->usb3_rhub.hcd = hcd;
-		/* xHCI private pointer was set in xhci_pci_probe for the second
-		 * registered roothub.
-		 */
+		xhci_hcd_init_usb3_data(xhci, hcd);
 		return 0;
 	}
 
 	mutex_init(&xhci->mutex);
+	xhci->main_hcd = hcd;
 	xhci->cap_regs = hcd->regs;
 	xhci->op_regs = hcd->regs +
 		HC_LENGTH(readl(&xhci->cap_regs->hc_capbase));