Subject: USB: relax usbcore reset timings

From: David Brownell <[email-masked]>
Date: Wed, 31 Aug 2005 10:41:44 -0700

This appears to help some folk, please merge.
This patch relaxes reset timings.  There are some reports that it
helps make enumeration work better on some high speed devices.

Signed-off-by: David Brownell <[email-masked]>
Signed-off-by: Greg Kroah-Hartman <[email-masked]>

---
 drivers/usb/core/hub.c |    9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

--- gregkh-2.6.orig/drivers/usb/core/hub.c	2005-09-12 11:01:57.000000000 -0700
+++ gregkh-2.6/drivers/usb/core/hub.c	2005-09-12 11:02:06.000000000 -0700
@@ -435,6 +435,7 @@ void usb_hub_tt_clear_buffer (struct usb
 static void hub_power_on(struct usb_hub *hub)
 {
 	int port1;
+	unsigned pgood_delay = hub->descriptor->bPwrOn2PwrGood * 2;
 
 	/* if hub supports power switching, enable power on each port */
 	if ((hub->descriptor->wHubCharacteristics & HUB_CHAR_LPSM) < 2) {
@@ -444,8 +445,8 @@ static void hub_power_on(struct usb_hub 
 					USB_PORT_FEAT_POWER);
 	}
 
-	/* Wait for power to be enabled */
-	msleep(hub->descriptor->bPwrOn2PwrGood * 2);
+	/* Wait at least 100 msec for power to become stable */
+	msleep(max(pgood_delay, (unsigned) 100));
 }
 
 static void hub_quiesce(struct usb_hub *hub)
@@ -1469,8 +1470,8 @@ static int hub_port_reset(struct usb_hub
 		/* return on disconnect or reset */
 		switch (status) {
 		case 0:
-			/* TRSTRCY = 10 ms */
-			msleep(10);
+			/* TRSTRCY = 10 ms; plus some extra */
+			msleep(10 + 40);
 			/* FALL THROUGH */
 		case -ENOTCONN:
 		case -ENODEV: