USB: Wait for extra delay time after USB_PORT_FEAT_RESET for quirky hub

Devices connected under Terminus Technology Inc. Hub (1a40:0101) may
fail to work after the system resumes from suspend:
[  206.063325] usb 3-2.4: reset full-speed USB device number 4 using xhci_hcd
[  206.143691] usb 3-2.4: device descriptor read/64, error -32
[  206.351671] usb 3-2.4: device descriptor read/64, error -32

Info for this hub:
T:  Bus=03 Lev=01 Prnt=01 Port=01 Cnt=01 Dev#=  2 Spd=480 MxCh= 4
D:  Ver= 2.00 Cls=09(hub  ) Sub=00 Prot=01 MxPS=64 #Cfgs=  1
P:  Vendor=1a40 ProdID=0101 Rev=01.11
S:  Product=USB 2.0 Hub
C:  #Ifs= 1 Cfg#= 1 Atr=e0 MxPwr=100mA
I:  If#= 0 Alt= 0 #EPs= 1 Cls=09(hub  ) Sub=00 Prot=00 Driver=hub

Some expirements indicate that the USB devices connected to the hub are
innocent, it's the hub itself is to blame. The hub needs extra delay
time after it resets its port.

Hence wait for extra delay, if the device is connected to this quirky
hub.

Signed-off-by: Kai-Heng Feng <kai.heng.feng@canonical.com>
Cc: stable <stable@vger.kernel.org>
Acked-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt
index 81d1d5a..19f4423 100644 (file)
--- a/Documentation/admin-guide/kernel-parameters.txt
+++ b/Documentation/admin-guide/kernel-parameters.txt
@@ -4713,6 +4713,8 @@
                                        prevent spurious wakeup);
                                n = USB_QUIRK_DELAY_CTRL_MSG (Device needs a
                                        pause after every control message);
+                               o = USB_QUIRK_HUB_SLOW_RESET (Hub needs extra
+                                       delay after resetting its port);
                        Example: quirks=0781:5580:bk,0a5c:5834:gij
 
        usbhid.mousepoll=

diff --git a/drivers/usb/core/hub.c b/drivers/usb/core/hub.c
index c6077d5..d9bd757 100644 (file)
--- a/drivers/usb/core/hub.c
+++ b/drivers/usb/core/hub.c
@@ -2794,6 +2794,7 @@ static int hub_port_reset(struct usb_hub *hub, int port1,
        int i, status;
        u16 portchange, portstatus;
        struct usb_port *port_dev = hub->ports[port1 - 1];
+       int reset_recovery_time;
 
        if (!hub_is_superspeed(hub->hdev)) {
                if (warm) {
@@ -2885,11 +2886,18 @@ static int hub_port_reset(struct usb_hub *hub, int port1,
 
 done:
        if (status == 0) {
-               /* TRSTRCY = 10 ms; plus some extra */
                if (port_dev->quirks & USB_PORT_QUIRK_FAST_ENUM)
                        usleep_range(10000, 12000);
-               else
-                       msleep(10 + 40);
+               else {
+                       /* TRSTRCY = 10 ms; plus some extra */
+                       reset_recovery_time = 10 + 40;
+
+                       /* Hub needs extra delay after resetting its port. */
+                       if (hub->hdev->quirks & USB_QUIRK_HUB_SLOW_RESET)
+                               reset_recovery_time += 100;
+
+                       msleep(reset_recovery_time);
+               }
 
                if (udev) {
                        struct usb_hcd *hcd = bus_to_hcd(udev->bus);

diff --git a/drivers/usb/core/quirks.c b/drivers/usb/core/quirks.c
index 178d6c6..4d7d948 100644 (file)
--- a/drivers/usb/core/quirks.c
+++ b/drivers/usb/core/quirks.c
@@ -128,6 +128,9 @@ static int quirks_param_set(const char *val, const struct kernel_param *kp)
                        case 'n':
                                flags |= USB_QUIRK_DELAY_CTRL_MSG;
                                break;
+                       case 'o':
+                               flags |= USB_QUIRK_HUB_SLOW_RESET;
+                               break;
                        /* Ignore unrecognized flag characters */
                        }
                }
@@ -380,6 +383,9 @@ static const struct usb_device_id usb_quirk_list[] = {
        { USB_DEVICE(0x1a0a, 0x0200), .driver_info =
                        USB_QUIRK_LINEAR_UFRAME_INTR_BINTERVAL },
 
+       /* Terminus Technology Inc. Hub */
+       { USB_DEVICE(0x1a40, 0x0101), .driver_info = USB_QUIRK_HUB_SLOW_RESET },
+
        /* Corsair K70 RGB */
        { USB_DEVICE(0x1b1c, 0x1b13), .driver_info = USB_QUIRK_DELAY_INIT },
 

diff --git a/include/linux/usb/quirks.h b/include/linux/usb/quirks.h
index b7a99ce..a1be64c 100644 (file)
--- a/include/linux/usb/quirks.h
+++ b/include/linux/usb/quirks.h
@@ -66,4 +66,7 @@
 /* Device needs a pause after every control message. */
 #define USB_QUIRK_DELAY_CTRL_MSG               BIT(13)
 
+/* Hub needs extra delay after resetting its port. */
+#define USB_QUIRK_HUB_SLOW_RESET               BIT(14)
+
 #endif /* __LINUX_USB_QUIRKS_H */