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>

diff --git a/drivers/usb/host/xhci-hub.c b/drivers/usb/host/xhci-hub.c
index 8163f17..7f2f63c 100644 (file)
--- 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

diff --git a/drivers/usb/host/xhci-mem.c b/drivers/usb/host/xhci-mem.c
index fd888bc..2027706 100644 (file)
--- a/drivers/usb/host/xhci-mem.c
+++ b/drivers/usb/host/xhci-mem.c
@@ -1445,6 +1445,7 @@ void xhci_mem_cleanup(struct xhci_hcd *xhci)
        scratchpad_free(xhci);
        xhci->page_size = 0;
        xhci->page_shift = 0;
+       xhci->bus_suspended = 0;
 }
 
 static int xhci_test_trb_in_td(struct xhci_hcd *xhci,

diff --git a/drivers/usb/host/xhci-pci.c b/drivers/usb/host/xhci-pci.c
index aefc349..3865f8c 100644 (file)
--- a/drivers/usb/host/xhci-pci.c
+++ b/drivers/usb/host/xhci-pci.c
@@ -162,6 +162,8 @@ static const struct hc_driver xhci_pci_hc_driver = {
        /* Root hub support */
        .hub_control =          xhci_hub_control,
        .hub_status_data =      xhci_hub_status_data,
+       .bus_suspend =          xhci_bus_suspend,
+       .bus_resume =           xhci_bus_resume,
 };
 
 /*-------------------------------------------------------------------------*/

diff --git a/drivers/usb/host/xhci.h b/drivers/usb/host/xhci.h
index ca4a923..196e21f 100644 (file)
--- a/drivers/usb/host/xhci.h
+++ b/drivers/usb/host/xhci.h
@@ -357,6 +357,8 @@ struct xhci_op_regs {
 #define PORT_U2_TIMEOUT(p)     (((p) & 0xff) << 8)
 /* Bits 24:31 for port testing */
 
+/* USB2 Protocol PORTSPMSC */
+#define PORT_RWE       (1 << 0x3)
 
 /**
  * struct xhci_intr_reg - Interrupt Register Set
@@ -1191,6 +1193,11 @@ struct xhci_hcd {
 #endif
        /* Host controller watchdog timer structures */
        unsigned int            xhc_state;
+
+       unsigned long           bus_suspended;
+       unsigned long           next_statechange;
+
+       u32                     command;
 /* Host controller is dying - not responding to commands. "I'm not dead yet!"
  *
  * xHC interrupts have been disabled and a watchdog timer will (or has already)
@@ -1460,6 +1467,8 @@ void xhci_ring_ep_doorbell(struct xhci_hcd *xhci, unsigned int slot_id,
 int xhci_hub_control(struct usb_hcd *hcd, u16 typeReq, u16 wValue, u16 wIndex,
                char *buf, u16 wLength);
 int xhci_hub_status_data(struct usb_hcd *hcd, char *buf);
+int xhci_bus_suspend(struct usb_hcd *hcd);
+int xhci_bus_resume(struct usb_hcd *hcd);
 u32 xhci_port_state_to_neutral(u32 state);
 int xhci_find_slot_id_by_port(struct xhci_hcd *xhci, u16 port);
 void xhci_ring_device(struct xhci_hcd *xhci, int slot_id);