[PATCH] USB: relax usbcore reset timings
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 PROTECTED]>
Signed-off-by: Greg Kroah-Hartman <[EMAIL PROTECTED]>
---
commit b789696af8b4102b7cc26dec30c2c51ce51ee18b
tree 75806037970504c56f5cfca1dfb4def0a0c35786
parent 5f9809487bf035b49ff470709a65fbce3b345f51
author David Brownell <[EMAIL PROTECTED]> Wed, 31 Aug 2005 10:41:44 -0700
committer Greg Kroah-Hartman <[EMAIL PROTECTED]> Mon, 12 Sep 2005 12:23:49 -0700
drivers/usb/core/hub.c | 9 +++++----
1 files changed, 5 insertions(+), 4 deletions(-)
diff --git a/drivers/usb/core/hub.c b/drivers/usb/core/hub.c
--- a/drivers/usb/core/hub.c
+++ b/drivers/usb/core/hub.c
@@ -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:
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