1 files changed, 195 insertions, 1 deletions

diff --git a/drivers/usb/host/xhci-hub.c b/drivers/usb/host/xhci-hub.c
index a1a7a9795536..14b48b261e06 100644
--- a/drivers/usb/host/xhci-hub.c
+++ b/drivers/usb/host/xhci-hub.c
@@ -129,6 +129,99 @@ static u32 xhci_port_state_to_neutral(u32 state)
         return (state & XHCI_PORT_RO) | (state & XHCI_PORT_RWS);
 }
 
+/*
+ * find slot id based on port number.
+ */
+static int xhci_find_slot_id_by_port(struct xhci_hcd *xhci, u16 port)
+{
+        int slot_id;
+        int i;
+
+        slot_id = 0;
+        for (i = 0; i < MAX_HC_SLOTS; i++) {
+                if (!xhci->devs[i])
+                        continue;
+                if (xhci->devs[i]->port == port) {
+                        slot_id = i;
+                        break;
+                }
+        }
+
+        return slot_id;
+}
+
+/*
+ * Stop device
+ * It issues stop endpoint command for EP 0 to 30. And wait the last command
+ * to complete.
+ * suspend will set to 1, if suspend bit need to set in command.
+ */
+static int xhci_stop_device(struct xhci_hcd *xhci, int slot_id, int suspend)
+{
+        struct xhci_virt_device *virt_dev;
+        struct xhci_command *cmd;
+        unsigned long flags;
+        int timeleft;
+        int ret;
+        int i;
+
+        ret = 0;
+        virt_dev = xhci->devs[slot_id];
+        cmd = xhci_alloc_command(xhci, false, true, GFP_NOIO);
+        if (!cmd) {
+                xhci_dbg(xhci, "Couldn't allocate command structure.\n");
+                return -ENOMEM;
+        }
+
+        spin_lock_irqsave(&xhci->lock, flags);
+        for (i = LAST_EP_INDEX; i > 0; i--) {
+                if (virt_dev->eps[i].ring && virt_dev->eps[i].ring->dequeue)
+                        xhci_queue_stop_endpoint(xhci, slot_id, i, suspend);
+        }
+        cmd->command_trb = xhci->cmd_ring->enqueue;
+        list_add_tail(&cmd->cmd_list, &virt_dev->cmd_list);
+        xhci_queue_stop_endpoint(xhci, slot_id, 0, suspend);
+        xhci_ring_cmd_db(xhci);
+        spin_unlock_irqrestore(&xhci->lock, flags);
+
+        /* Wait for last stop endpoint command to finish */
+        timeleft = wait_for_completion_interruptible_timeout(
+                        cmd->completion,
+                        USB_CTRL_SET_TIMEOUT);
+        if (timeleft <= 0) {
+                xhci_warn(xhci, "%s while waiting for stop endpoint command\n",
+                                timeleft == 0 ? "Timeout" : "Signal");
+                spin_lock_irqsave(&xhci->lock, flags);
+                /* The timeout might have raced with the event ring handler, so
+                 * only delete from the list if the item isn't poisoned.
+                 */
+                if (cmd->cmd_list.next != LIST_POISON1)
+                        list_del(&cmd->cmd_list);
+                spin_unlock_irqrestore(&xhci->lock, flags);
+                ret = -ETIME;
+                goto command_cleanup;
+        }
+
+command_cleanup:
+        xhci_free_command(xhci, cmd);
+        return ret;
+}
+
+/*
+ * Ring device, it rings the all doorbells unconditionally.
+ */
+static void xhci_ring_device(struct xhci_hcd *xhci, int slot_id)
+{
+        int i;
+
+        for (i = 0; i < LAST_EP_INDEX + 1; i++)
+                if (xhci->devs[slot_id]->eps[i].ring &&
+                    xhci->devs[slot_id]->eps[i].ring->dequeue)
+                        xhci_ring_ep_doorbell(xhci, slot_id, i, 0);
+
+        return;
+}
+
 static void xhci_disable_port(struct xhci_hcd *xhci, u16 wIndex,
                 u32 __iomem *addr, u32 port_status)
 {
@@ -162,6 +255,10 @@ static void xhci_clear_port_change_bit(struct xhci_hcd *xhci, u16 wValue,
                 status = PORT_PEC;
                 port_change_bit = "enable/disable";
                 break;
+        case USB_PORT_FEAT_C_SUSPEND:
+                status = PORT_PLC;
+                port_change_bit = "suspend/resume";
+                break;
         default:
                 /* Should never happen */
                 return;
@@ -182,6 +279,7 @@ int xhci_hub_control(struct usb_hcd *hcd, u16 typeReq, u16 wValue,
         u32 temp, status;
         int retval = 0;
         u32 __iomem *addr;
+        int slot_id;
 
         ports = HCS_MAX_PORTS(xhci->hcs_params1);
 
@@ -211,9 +309,21 @@ int xhci_hub_control(struct usb_hcd *hcd, u16 typeReq, u16 wValue,
                 if ((temp & PORT_OCC))
                         status |= USB_PORT_STAT_C_OVERCURRENT << 16;
                 /*
-                 * FIXME ignoring suspend, reset, and USB 2.1/3.0 specific
+                 * FIXME ignoring reset and USB 2.1/3.0 specific
                  * changes
                  */
+                if ((temp & PORT_PLS_MASK) == XDEV_U3
+                        && (temp & PORT_POWER))
+                        status |= 1 << USB_PORT_FEAT_SUSPEND;
+                if ((temp & PORT_PLS_MASK) == XDEV_U0
+                        && (temp & PORT_POWER)
+                        && (xhci->suspended_ports[wIndex >> 5] &
+                            (1 << (wIndex & 31)))) {
+                        xhci->suspended_ports[wIndex >> 5] &=
+                                        ~(1 << (wIndex & 31));
+                        xhci->port_c_suspend[wIndex >> 5] |=
+                                        1 << (wIndex & 31);
+                }
                 if (temp & PORT_CONNECT) {
                         status |= USB_PORT_STAT_CONNECTION;
                         status |= xhci_port_speed(temp);
@@ -226,6 +336,8 @@ int xhci_hub_control(struct usb_hcd *hcd, u16 typeReq, u16 wValue,
                         status |= USB_PORT_STAT_RESET;
                 if (temp & PORT_POWER)
                         status |= USB_PORT_STAT_POWER;
+                if (xhci->port_c_suspend[wIndex >> 5] & (1 << (wIndex & 31)))
+                        status |= 1 << USB_PORT_FEAT_C_SUSPEND;
                 xhci_dbg(xhci, "Get port status returned 0x%x\n", status);
                 put_unaligned(cpu_to_le32(status), (__le32 *) buf);
                 break;
@@ -238,6 +350,42 @@ int xhci_hub_control(struct usb_hcd *hcd, u16 typeReq, u16 wValue,
                 temp = xhci_readl(xhci, addr);
                 temp = xhci_port_state_to_neutral(temp);
                 switch (wValue) {
+                case USB_PORT_FEAT_SUSPEND:
+                        temp = xhci_readl(xhci, addr);
+                        /* In spec software should not attempt to suspend
+                         * a port unless the port reports that it is in the
+                         * enabled (PED = ‘1’,PLS < ‘3’) state.
+                         */
+                        if ((temp & PORT_PE) == 0 || (temp & PORT_RESET)
+                                || (temp & PORT_PLS_MASK) >= XDEV_U3) {
+                                xhci_warn(xhci, "USB core suspending device "
+                                          "not in U0/U1/U2.\n");
+                                goto error;
+                        }
+
+                        slot_id = xhci_find_slot_id_by_port(xhci, wIndex + 1);
+                        if (!slot_id) {
+                                xhci_warn(xhci, "slot_id is zero\n");
+                                goto error;
+                        }
+                        /* unlock to execute stop endpoint commands */
+                        spin_unlock_irqrestore(&xhci->lock, flags);
+                        xhci_stop_device(xhci, slot_id, 1);
+                        spin_lock_irqsave(&xhci->lock, flags);
+
+                        temp = xhci_port_state_to_neutral(temp);
+                        temp &= ~PORT_PLS_MASK;
+                        temp |= PORT_LINK_STROBE | XDEV_U3;
+                        xhci_writel(xhci, temp, addr);
+
+                        spin_unlock_irqrestore(&xhci->lock, flags);
+                        msleep(10); /* wait device to enter */
+                        spin_lock_irqsave(&xhci->lock, flags);
+
+                        temp = xhci_readl(xhci, addr);
+                        xhci->suspended_ports[wIndex >> 5] |=
+                                        1 << (wIndex & (31));
+                        break;
                 case USB_PORT_FEAT_POWER:
                         /*
                          * Turn on ports, even if there isn't per-port switching.
@@ -271,6 +419,52 @@ int xhci_hub_control(struct usb_hcd *hcd, u16 typeReq, u16 wValue,
                 temp = xhci_readl(xhci, addr);
                 temp = xhci_port_state_to_neutral(temp);
                 switch (wValue) {
+                case USB_PORT_FEAT_SUSPEND:
+                        temp = xhci_readl(xhci, addr);
+                        xhci_dbg(xhci, "clear USB_PORT_FEAT_SUSPEND\n");
+                        xhci_dbg(xhci, "PORTSC %04x\n", temp);
+                        if (temp & PORT_RESET)
+                                goto error;
+                        if (temp & XDEV_U3) {
+                                if ((temp & PORT_PE) == 0)
+                                        goto error;
+                                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);
+                                        xhci_readl(xhci, 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);
+                                }
+                                xhci->port_c_suspend[wIndex >> 5] |=
+                                                1 << (wIndex & 31);
+                        }
+
+                        slot_id = xhci_find_slot_id_by_port(xhci, wIndex + 1);
+                        if (!slot_id) {
+                                xhci_dbg(xhci, "slot_id is zero\n");
+                                goto error;
+                        }
+                        xhci_ring_device(xhci, slot_id);
+                        break;
+                case USB_PORT_FEAT_C_SUSPEND:
+                        xhci->port_c_suspend[wIndex >> 5] &=
+                                        ~(1 << (wIndex & 31));
                 case USB_PORT_FEAT_C_RESET:
                 case USB_PORT_FEAT_C_CONNECTION:
                 case USB_PORT_FEAT_C_OVER_CURRENT: