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[PATCH] USB: relax usbcore reset timings

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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 <dbrownell@users.sourceforge.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
David Brownell 2005-08-31 10:41:44 -07:00 committed by Greg Kroah-Hartman
parent 5f9809487b
commit b789696af8
1 changed files with 5 additions and 4 deletions
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9
drivers/usb/core/hub.c
View file

@ -435,6 +435,7 @@ void usb_hub_tt_clear_buffer (struct usb_device *udev, int pipe)
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 *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 *hub, int port1,
/* 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: