ehci: Check individual port status registers on resume

If a device plug/unplug is detected on an ATI SB700 USB controller in D3,
it appears to set the port status register but not the controller status
register. As a result we'll fail to detect the plug event. Check the port
status register on resume as well in order to catch this case.

Signed-off-by: Matthew Garrett <mjg@redhat.com>
Cc: stable <stable@kernel.org> [after .39-rc1 is out]
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 22 insertions, 1 deletions

diff --git a/drivers/usb/host/ehci-hub.c b/drivers/usb/host/ehci-hub.c
index c0b37fedfbc2..ae0140dd9b9b 100644
--- a/drivers/usb/host/ehci-hub.c
+++ b/drivers/usb/host/ehci-hub.c
@@ -106,6 +106,27 @@ static void ehci_handover_companion_ports(struct ehci_hcd *ehci)
         ehci->owned_ports = 0;
 }
 
+static int ehci_port_change(struct ehci_hcd *ehci)
+{
+        int i = HCS_N_PORTS(ehci->hcs_params);
+
+        /* First check if the controller indicates a change event */
+
+        if (ehci_readl(ehci, &ehci->regs->status) & STS_PCD)
+                return 1;
+
+        /*
+         * Not all controllers appear to update this while going from D3 to D0,
+         * so check the individual port status registers as well
+         */
+
+        while (i--)
+                if (ehci_readl(ehci, &ehci->regs->port_status[i]) & PORT_CSC)
+                        return 1;
+
+        return 0;
+}
+
 static void ehci_adjust_port_wakeup_flags(struct ehci_hcd *ehci,
                 bool suspending, bool do_wakeup)
 {
@@ -173,7 +194,7 @@ static void ehci_adjust_port_wakeup_flags(struct ehci_hcd *ehci,
         }
 
         /* Does the root hub have a port wakeup pending? */
-        if (!suspending && (ehci_readl(ehci, &ehci->regs->status) & STS_PCD))
+        if (!suspending && ehci_port_change(ehci))
                 usb_hcd_resume_root_hub(ehci_to_hcd(ehci));
 
         spin_unlock_irqrestore(&ehci->lock, flags);