>From 031335826c721b80974beefd9f1126a3e12be292 Mon Sep 17 00:00:00 2001
From: Andiry Xu <andiry.xu@xxxxxxx>
Date: Mon, 3 May 2010 01:50:45 +0800
Subject: [PATCH] usbcore: Do not disable USB3 protocol ports in hub_activate
When USB3 protocol port detects an USB3.0 device attach, the port will
automatically transition to the Enabled state upon the completion
of successful link training.
Do not disable USB3 protocol ports in hub_activate(), or USB3.0 device
will fail to be recognized if xHCI bus power management is implemented.
Signed-off-by: Andiry Xu <andiry.xu@xxxxxxx>
---
drivers/usb/core/hub.c | 16 ++++++++++++++--
1 files changed, 14 insertions(+), 2 deletions(-)
diff --git a/drivers/usb/core/hub.c b/drivers/usb/core/hub.c
index 7d235d4..647c447 100644
--- a/drivers/usb/core/hub.c
+++ b/drivers/usb/core/hub.c
@@ -745,8 +745,20 @@ static void hub_activate(struct usb_hub *hub, enum hub_activation_type type)
!(portstatus & USB_PORT_STAT_CONNECTION) ||
!udev ||
udev->state == USB_STATE_NOTATTACHED)) {
- clear_port_feature(hdev, port1, USB_PORT_FEAT_ENABLE);
- portstatus &= ~USB_PORT_STAT_ENABLE;
+ /*
+ * USB3 protocol ports will automatically transition
+ * to Enabled state when detect an USB3.0 device attach.
+ * Do not disable USB3 protocol ports.
+ * FIXME: USB3 root hub and external hubs are treated
+ * differently here.
+ */
+ if (hdev->descriptor.bDeviceProtocol != 3 ||
+ (!hdev->parent &&
+ !(portstatus & USB_PORT_STAT_SUPER_SPEED))) {
+ clear_port_feature(hdev, port1,
+ USB_PORT_FEAT_ENABLE);
+ portstatus &= ~USB_PORT_STAT_ENABLE;
+ }
}
/* Clear status-change flags; we'll debounce later */
--
1.6.3.3
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