usbcore: Refine USB3.0 device suspend and resume

In the past, we use USB2.0 request to suspend and resume a USB3.0 device.
Actually, USB3.0 hub does not support Set/Clear PORT_SUSPEND request,
instead, it uses Set PORT_LINK_STATE request. This patch makes USB3.0 device
suspend/resume comply with USB3.0 specification.

This patch fixes the issue that USB3.0 device can not be suspended when
connected to a USB3.0 external hub.

Signed-off-by: Andiry Xu <andiry.xu@amd.com>
Signed-off-by: Sarah Sharp <sarah.a.sharp@linux.intel.com>

diff --git a/drivers/usb/core/hub.c b/drivers/usb/core/hub.c
index dcd78c1..93035d8 100644 (file)
--- a/drivers/usb/core/hub.c
+++ b/drivers/usb/core/hub.c
@@ -2307,14 +2307,10 @@ int usb_port_suspend(struct usb_device *udev, pm_message_t msg)
        }
 
        /* see 7.1.7.6 */
-       /* Clear PORT_POWER if it's a USB3.0 device connected to USB 3.0
-        * external hub.
-        * FIXME: this is a temporary workaround to make the system able
-        * to suspend/resume.
-        */
-       if ((hub->hdev->parent != NULL) && hub_is_superspeed(hub->hdev))
-               status = clear_port_feature(hub->hdev, port1,
-                                               USB_PORT_FEAT_POWER);
+       if (hub_is_superspeed(hub->hdev))
+               status = set_port_feature(hub->hdev,
+                               port1 | (USB_SS_PORT_LS_U3 << 3),
+                               USB_PORT_FEAT_LINK_STATE);
        else
                status = set_port_feature(hub->hdev, port1,
                                                USB_PORT_FEAT_SUSPEND);
@@ -2469,8 +2465,13 @@ int usb_port_resume(struct usb_device *udev, pm_message_t msg)
        set_bit(port1, hub->busy_bits);
 
        /* see 7.1.7.7; affects power usage, but not budgeting */
-       status = clear_port_feature(hub->hdev,
-                       port1, USB_PORT_FEAT_SUSPEND);
+       if (hub_is_superspeed(hub->hdev))
+               status = set_port_feature(hub->hdev,
+                               port1 | (USB_SS_PORT_LS_U0 << 3),
+                               USB_PORT_FEAT_LINK_STATE);
+       else
+               status = clear_port_feature(hub->hdev,
+                               port1, USB_PORT_FEAT_SUSPEND);
        if (status) {
                dev_dbg(hub->intfdev, "can't resume port %d, status %d\n",
                                port1, status);
@@ -2492,9 +2493,15 @@ int usb_port_resume(struct usb_device *udev, pm_message_t msg)
 
  SuspendCleared:
        if (status == 0) {
-               if (portchange & USB_PORT_STAT_C_SUSPEND)
-                       clear_port_feature(hub->hdev, port1,
-                                       USB_PORT_FEAT_C_SUSPEND);
+               if (hub_is_superspeed(hub->hdev)) {
+                       if (portchange & USB_PORT_STAT_C_LINK_STATE)
+                               clear_port_feature(hub->hdev, port1,
+                                       USB_PORT_FEAT_C_PORT_LINK_STATE);
+               } else {
+                       if (portchange & USB_PORT_STAT_C_SUSPEND)
+                               clear_port_feature(hub->hdev, port1,
+                                               USB_PORT_FEAT_C_SUSPEND);
+               }
        }
 
        clear_bit(port1, hub->busy_bits);

diff --git a/drivers/usb/host/xhci-hub.c b/drivers/usb/host/xhci-hub.c
index 4a3ca99..e3ddc6a 100644 (file)
--- a/drivers/usb/host/xhci-hub.c
+++ b/drivers/usb/host/xhci-hub.c
@@ -483,7 +483,8 @@ int xhci_hub_control(struct usb_hcd *hcd, u16 typeReq, u16 wValue,
                        && (temp & PORT_POWER)
                        && (bus_state->suspended_ports & (1 << wIndex))) {
                        bus_state->suspended_ports &= ~(1 << wIndex);
-                       bus_state->port_c_suspend |= 1 << wIndex;
+                       if (hcd->speed != HCD_USB3)
+                               bus_state->port_c_suspend |= 1 << wIndex;
                }
                if (temp & PORT_CONNECT) {
                        status |= USB_PORT_STAT_CONNECTION;
@@ -656,35 +657,27 @@ int xhci_hub_control(struct usb_hcd *hcd, u16 typeReq, u16 wValue,
                        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,
-                                                       port_array[wIndex]);
-                                       xhci_readl(xhci, port_array[wIndex]);
-                               } else {
-                                       temp = xhci_port_state_to_neutral(temp);
-                                       temp &= ~PORT_PLS_MASK;
-                                       temp |= PORT_LINK_STROBE | XDEV_RESUME;
-                                       xhci_writel(xhci, temp,
-                                                       port_array[wIndex]);
 
-                                       spin_unlock_irqrestore(&xhci->lock,
-                                                              flags);
-                                       msleep(20);
-                                       spin_lock_irqsave(&xhci->lock, flags);
+                               temp = xhci_port_state_to_neutral(temp);
+                               temp &= ~PORT_PLS_MASK;
+                               temp |= PORT_LINK_STROBE | XDEV_RESUME;
+                               xhci_writel(xhci, temp,
+                                               port_array[wIndex]);
 
-                                       temp = xhci_readl(xhci,
-                                                       port_array[wIndex]);
-                                       temp = xhci_port_state_to_neutral(temp);
-                                       temp &= ~PORT_PLS_MASK;
-                                       temp |= PORT_LINK_STROBE | XDEV_U0;
-                                       xhci_writel(xhci, temp,
-                                                       port_array[wIndex]);
-                               }
-                               bus_state->port_c_suspend |= 1 << wIndex;
+                               spin_unlock_irqrestore(&xhci->lock,
+                                                      flags);
+                               msleep(20);
+                               spin_lock_irqsave(&xhci->lock, flags);
+
+                               temp = xhci_readl(xhci,
+                                               port_array[wIndex]);
+                               temp = xhci_port_state_to_neutral(temp);
+                               temp &= ~PORT_PLS_MASK;
+                               temp |= PORT_LINK_STROBE | XDEV_U0;
+                               xhci_writel(xhci, temp,
+                                               port_array[wIndex]);
                        }
+                       bus_state->port_c_suspend |= 1 << wIndex;
 
                        slot_id = xhci_find_slot_id_by_port(hcd, xhci,
                                        wIndex + 1);
@@ -755,7 +748,7 @@ int xhci_hub_status_data(struct usb_hcd *hcd, char *buf)
        memset(buf, 0, retval);
        status = 0;
 
-       mask = PORT_CSC | PORT_PEC | PORT_OCC;
+       mask = PORT_CSC | PORT_PEC | PORT_OCC | PORT_PLC;
 
        spin_lock_irqsave(&xhci->lock, flags);
        /* For each port, did anything change?  If so, set that bit in buf. */