usb: xhci: rework root port wake bits if controller isn't allowed to wakeup

When system is being suspended, if host device is not allowed to do wakeup,
xhci_suspend() needs to clear all root port wake on bits. Otherwise, some
platforms may generate spurious wakeup, even if PCI PME# is disabled.

The initial commit ff8cbf250b44 ("xhci: clear root port wake on bits"),
which also got into stable, turned out to not work correctly and had to
be reverted, and is now rewritten.

Cc: stable <stable@vger.kernel.org> # v3.2+
Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>
Suggested-by: Alan Stern <stern@rowland.harvard.edu>
Acked-by: Alan Stern <stern@rowland.harvard.edu>
[Mathias Nyman: reword commit message]
Signed-off-by: Mathias Nyman <mathias.nyman@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

4 files changed, 52 insertions, 4 deletions

diff --git a/drivers/usb/host/xhci-pci.c b/drivers/usb/host/xhci-pci.c
index 9a69b1f1b300..142b601f9563 100644
--- a/drivers/usb/host/xhci-pci.c
+++ b/drivers/usb/host/xhci-pci.c
@@ -281,7 +281,7 @@ static int xhci_pci_suspend(struct usb_hcd *hcd, bool do_wakeup)
         if (xhci->quirks & XHCI_COMP_MODE_QUIRK)
                 pdev->no_d3cold = true;
 
-        return xhci_suspend(xhci);
+        return xhci_suspend(xhci, do_wakeup);
 }
 
 static int xhci_pci_resume(struct usb_hcd *hcd, bool hibernated)
diff --git a/drivers/usb/host/xhci-plat.c b/drivers/usb/host/xhci-plat.c
index 3d78b0cd674b..646300cbe5f7 100644
--- a/drivers/usb/host/xhci-plat.c
+++ b/drivers/usb/host/xhci-plat.c
@@ -204,7 +204,15 @@ static int xhci_plat_suspend(struct device *dev)
         struct usb_hcd  *hcd = dev_get_drvdata(dev);
         struct xhci_hcd *xhci = hcd_to_xhci(hcd);
 
-        return xhci_suspend(xhci);
+        /*
+         * xhci_suspend() needs `do_wakeup` to know whether host is allowed
+         * to do wakeup during suspend. Since xhci_plat_suspend is currently
+         * only designed for system suspend, device_may_wakeup() is enough
+         * to dertermine whether host is allowed to do wakeup. Need to
+         * reconsider this when xhci_plat_suspend enlarges its scope, e.g.,
+         * also applies to runtime suspend.
+         */
+        return xhci_suspend(xhci, device_may_wakeup(dev));
 }
 
 static int xhci_plat_resume(struct device *dev)
diff --git a/drivers/usb/host/xhci.c b/drivers/usb/host/xhci.c
index 4d0d2407b71c..033b46c470bd 100644
--- a/drivers/usb/host/xhci.c
+++ b/drivers/usb/host/xhci.c
@@ -35,6 +35,8 @@
 #define DRIVER_AUTHOR "Sarah Sharp"
 #define DRIVER_DESC "'eXtensible' Host Controller (xHC) Driver"
 
+#define PORT_WAKE_BITS  (PORT_WKOC_E | PORT_WKDISC_E | PORT_WKCONN_E)
+
 /* Some 0.95 hardware can't handle the chain bit on a Link TRB being cleared */
 static int link_quirk;
 module_param(link_quirk, int, S_IRUGO | S_IWUSR);
@@ -851,13 +853,47 @@ static void xhci_clear_command_ring(struct xhci_hcd *xhci)
         xhci_set_cmd_ring_deq(xhci);
 }
 
+static void xhci_disable_port_wake_on_bits(struct xhci_hcd *xhci)
+{
+        int port_index;
+        __le32 __iomem **port_array;
+        unsigned long flags;
+        u32 t1, t2;
+
+        spin_lock_irqsave(&xhci->lock, flags);
+
+        /* disble usb3 ports Wake bits*/
+        port_index = xhci->num_usb3_ports;
+        port_array = xhci->usb3_ports;
+        while (port_index--) {
+                t1 = readl(port_array[port_index]);
+                t1 = xhci_port_state_to_neutral(t1);
+                t2 = t1 & ~PORT_WAKE_BITS;
+                if (t1 != t2)
+                        writel(t2, port_array[port_index]);
+        }
+
+        /* disble usb2 ports Wake bits*/
+        port_index = xhci->num_usb2_ports;
+        port_array = xhci->usb2_ports;
+        while (port_index--) {
+                t1 = readl(port_array[port_index]);
+                t1 = xhci_port_state_to_neutral(t1);
+                t2 = t1 & ~PORT_WAKE_BITS;
+                if (t1 != t2)
+                        writel(t2, port_array[port_index]);
+        }
+
+        spin_unlock_irqrestore(&xhci->lock, flags);
+}
+
 /*
  * Stop HC (not bus-specific)
  *
  * This is called when the machine transition into S3/S4 mode.
  *
  */
-int xhci_suspend(struct xhci_hcd *xhci)
+int xhci_suspend(struct xhci_hcd *xhci, bool do_wakeup)
 {
         int                     rc = 0;
         unsigned int            delay = XHCI_MAX_HALT_USEC;
@@ -868,6 +904,10 @@ int xhci_suspend(struct xhci_hcd *xhci)
                         xhci->shared_hcd->state != HC_STATE_SUSPENDED)
                 return -EINVAL;
 
+        /* Clear root port wake on bits if wakeup not allowed. */
+        if (!do_wakeup)
+                xhci_disable_port_wake_on_bits(xhci);
+
         /* Don't poll the roothubs on bus suspend. */
         xhci_dbg(xhci, "%s: stopping port polling.\n", __func__);
         clear_bit(HCD_FLAG_POLL_RH, &hcd->flags);
diff --git a/drivers/usb/host/xhci.h b/drivers/usb/host/xhci.h
index df76d642e719..d745715a1e2f 100644
--- a/drivers/usb/host/xhci.h
+++ b/drivers/usb/host/xhci.h
@@ -1746,7 +1746,7 @@ int xhci_gen_setup(struct usb_hcd *hcd, xhci_get_quirks_t get_quirks);
 void xhci_init_driver(struct hc_driver *drv, int (*setup_fn)(struct usb_hcd *));
 
 #ifdef  CONFIG_PM
-int xhci_suspend(struct xhci_hcd *xhci);
+int xhci_suspend(struct xhci_hcd *xhci, bool do_wakeup);
 int xhci_resume(struct xhci_hcd *xhci, bool hibernated);
 #else
 #define xhci_suspend    NULL