USB: xHCI: bus power management implementation

This patch implements xHCI bus suspend/resume function hook.

In the patch it goes through all the ports and suspend/resume
the ports if needed.

If any port is in remote wakeup, abort bus suspend as what ehci/ohci do.

Signed-off-by: Libin Yang <libin.yang@amd.com>
Signed-off-by: Crane Cai <crane.cai@amd.com>
Signed-off-by: Andiry Xu <andiry.xu@amd.com>
Signed-off-by: Sarah Sharp <sarah.a.sharp@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 188 insertions, 0 deletions

diff --git a/drivers/usb/host/xhci-hub.c b/drivers/usb/host/xhci-hub.c
index 8163f17..7f2f63c 100644
--- a/drivers/usb/host/xhci-hub.c
+++ b/drivers/usb/host/xhci-hub.c
@@ -24,6 +24,10 @@
 
 #include "xhci.h"
 
+#define	PORT_WAKE_BITS	(PORT_WKOC_E | PORT_WKDISC_E | PORT_WKCONN_E)
+#define	PORT_RWC_BITS	(PORT_CSC | PORT_PEC | PORT_WRC | PORT_OCC | \
+			 PORT_RC | PORT_PLC | PORT_PE)
+
 static void xhci_hub_descriptor(struct xhci_hcd *xhci,
 		struct usb_hub_descriptor *desc)
 {
@@ -560,3 +564,187 @@ int xhci_hub_status_data(struct usb_hcd *hcd, char *buf)
 	spin_unlock_irqrestore(&xhci->lock, flags);
 	return status ? retval : 0;
 }
+
+#ifdef CONFIG_PM
+
+int xhci_bus_suspend(struct usb_hcd *hcd)
+{
+	struct xhci_hcd	*xhci = hcd_to_xhci(hcd);
+	int port;
+	unsigned long flags;
+
+	xhci_dbg(xhci, "suspend root hub\n");
+
+	spin_lock_irqsave(&xhci->lock, flags);
+
+	if (hcd->self.root_hub->do_remote_wakeup) {
+		port = HCS_MAX_PORTS(xhci->hcs_params1);
+		while (port--) {
+			if (xhci->resume_done[port] != 0) {
+				spin_unlock_irqrestore(&xhci->lock, flags);
+				xhci_dbg(xhci, "suspend failed because "
+						"port %d is resuming\n",
+						port + 1);
+				return -EBUSY;
+			}
+		}
+	}
+
+	port = HCS_MAX_PORTS(xhci->hcs_params1);
+	xhci->bus_suspended = 0;
+	while (port--) {
+		/* suspend the port if the port is not suspended */
+		u32 __iomem *addr;
+		u32 t1, t2;
+		int slot_id;
+
+		addr = &xhci->op_regs->port_status_base +
+			NUM_PORT_REGS * (port & 0xff);
+		t1 = xhci_readl(xhci, addr);
+		t2 = xhci_port_state_to_neutral(t1);
+
+		if ((t1 & PORT_PE) && !(t1 & PORT_PLS_MASK)) {
+			xhci_dbg(xhci, "port %d not suspended\n", port);
+			slot_id = xhci_find_slot_id_by_port(xhci, port + 1);
+			if (slot_id) {
+				spin_unlock_irqrestore(&xhci->lock, flags);
+				xhci_stop_device(xhci, slot_id, 1);
+				spin_lock_irqsave(&xhci->lock, flags);
+			}
+			t2 &= ~PORT_PLS_MASK;
+			t2 |= PORT_LINK_STROBE | XDEV_U3;
+			set_bit(port, &xhci->bus_suspended);
+		}
+		if (hcd->self.root_hub->do_remote_wakeup) {
+			if (t1 & PORT_CONNECT) {
+				t2 |= PORT_WKOC_E | PORT_WKDISC_E;
+				t2 &= ~PORT_WKCONN_E;
+			} else {
+				t2 |= PORT_WKOC_E | PORT_WKCONN_E;
+				t2 &= ~PORT_WKDISC_E;
+			}
+		} else
+			t2 &= ~PORT_WAKE_BITS;
+
+		t1 = xhci_port_state_to_neutral(t1);
+		if (t1 != t2)
+			xhci_writel(xhci, t2, addr);
+
+		if (DEV_HIGHSPEED(t1)) {
+			/* enable remote wake up for USB 2.0 */
+			u32 __iomem *addr;
+			u32 tmp;
+
+			addr = &xhci->op_regs->port_power_base +
+				NUM_PORT_REGS * (port & 0xff);
+			tmp = xhci_readl(xhci, addr);
+			tmp |= PORT_RWE;
+			xhci_writel(xhci, tmp, addr);
+		}
+	}
+	hcd->state = HC_STATE_SUSPENDED;
+	xhci->next_statechange = jiffies + msecs_to_jiffies(10);
+	spin_unlock_irqrestore(&xhci->lock, flags);
+	return 0;
+}
+
+int xhci_bus_resume(struct usb_hcd *hcd)
+{
+	struct xhci_hcd	*xhci = hcd_to_xhci(hcd);
+	int port;
+	u32 temp;
+	unsigned long flags;
+
+	xhci_dbg(xhci, "resume root hub\n");
+
+	if (time_before(jiffies, xhci->next_statechange))
+		msleep(5);
+
+	spin_lock_irqsave(&xhci->lock, flags);
+	if (!HCD_HW_ACCESSIBLE(hcd)) {
+		spin_unlock_irqrestore(&xhci->lock, flags);
+		return -ESHUTDOWN;
+	}
+
+	/* delay the irqs */
+	temp = xhci_readl(xhci, &xhci->op_regs->command);
+	temp &= ~CMD_EIE;
+	xhci_writel(xhci, temp, &xhci->op_regs->command);
+
+	port = HCS_MAX_PORTS(xhci->hcs_params1);
+	while (port--) {
+		/* Check whether need resume ports. If needed
+		   resume port and disable remote wakeup */
+		u32 __iomem *addr;
+		u32 temp;
+		int slot_id;
+
+		addr = &xhci->op_regs->port_status_base +
+			NUM_PORT_REGS * (port & 0xff);
+		temp = xhci_readl(xhci, addr);
+		if (DEV_SUPERSPEED(temp))
+			temp &= ~(PORT_RWC_BITS | PORT_CEC | PORT_WAKE_BITS);
+		else
+			temp &= ~(PORT_RWC_BITS | PORT_WAKE_BITS);
+		if (test_bit(port, &xhci->bus_suspended) &&
+		    (temp & PORT_PLS_MASK)) {
+			if (DEV_SUPERSPEED(temp)) {
+				temp = xhci_port_state_to_neutral(temp);
+				temp &= ~PORT_PLS_MASK;
+				temp |= PORT_LINK_STROBE | XDEV_U0;
+				xhci_writel(xhci, temp, addr);
+			} else {
+				temp = xhci_port_state_to_neutral(temp);
+				temp &= ~PORT_PLS_MASK;
+				temp |= PORT_LINK_STROBE | XDEV_RESUME;
+				xhci_writel(xhci, temp, addr);
+
+				spin_unlock_irqrestore(&xhci->lock, flags);
+				msleep(20);
+				spin_lock_irqsave(&xhci->lock, flags);
+
+				temp = xhci_readl(xhci, addr);
+				temp = xhci_port_state_to_neutral(temp);
+				temp &= ~PORT_PLS_MASK;
+				temp |= PORT_LINK_STROBE | XDEV_U0;
+				xhci_writel(xhci, temp, addr);
+			}
+			slot_id = xhci_find_slot_id_by_port(xhci, port + 1);
+			if (slot_id)
+				xhci_ring_device(xhci, slot_id);
+		} else
+			xhci_writel(xhci, temp, addr);
+
+		if (DEV_HIGHSPEED(temp)) {
+			/* disable remote wake up for USB 2.0 */
+			u32 __iomem *addr;
+			u32 tmp;
+
+			addr = &xhci->op_regs->port_power_base +
+				NUM_PORT_REGS * (port & 0xff);
+			tmp = xhci_readl(xhci, addr);
+			tmp &= ~PORT_RWE;
+			xhci_writel(xhci, tmp, addr);
+		}
+	}
+
+	(void) xhci_readl(xhci, &xhci->op_regs->command);
+
+	xhci->next_statechange = jiffies + msecs_to_jiffies(5);
+	hcd->state = HC_STATE_RUNNING;
+	/* re-enable irqs */
+	temp = xhci_readl(xhci, &xhci->op_regs->command);
+	temp |= CMD_EIE;
+	xhci_writel(xhci, temp, &xhci->op_regs->command);
+	temp = xhci_readl(xhci, &xhci->op_regs->command);
+
+	spin_unlock_irqrestore(&xhci->lock, flags);
+	return 0;
+}
+
+#else
+
+#define	xhci_bus_suspend	NULL
+#define	xhci_bus_resume		NULL
+
+#endif