/* return: -1 on error, 0 on success, 1 on disconnect. */
static int hub_port_reset(struct usb_device *hub, int port,
struct usb_device *dev, unsigned int delay)
{
int i, status;
/* Reset the port */
for (i = 0; i < HUB_RESET_TRIES; i++) {
set_port_feature(hub, port + 1, USB_PORT_FEAT_RESET);
/* return on disconnect or reset */
status = hub_port_wait_reset(hub, port, dev, delay);
if (status != -1) {
clear_port_feature(hub,
port + 1, USB_PORT_FEAT_C_RESET);
dev->state = status
? USB_STATE_NOTATTACHED
: USB_STATE_DEFAULT;
return status;
}
dev_dbg (hubdev (hub),
"port %d not enabled, trying reset again...\n",
port + 1);
delay = HUB_LONG_RESET_TIME;
}
dev_err (hubdev (hub),
"Cannot enable port %i. Maybe the USB cable is bad?\n",
port + 1);
return -1;
}
int hub_port_reset(struct usb_device *dev, int port,
unsigned short *portstat)
{
int tries, status;
unsigned delay = HUB_SHORT_RESET_TIME;
int oldspeed = dev->speed;
/* root hub ports have a slightly longer reset period
* (from USB 2.0 spec, section 7.1.7.5)
*/
if (!dev->parent) {
delay = HUB_ROOT_RESET_TIME;
}
/* Some low speed devices have problems with the quick delay, so */
/* be a bit pessimistic with those devices. RHbug #23670 */
if (oldspeed == USB_SPEED_LOW)
delay = HUB_LONG_RESET_TIME;
USB_HUB_PRINTF("hub_port_reset: resetting port %d...\n", port);
for (tries = 0; tries < MAX_TRIES; tries++) {
status = usb_set_port_feature(dev, port + 1, USB_PORT_FEAT_RESET);
if (status)
USB_HUB_PRINTF("cannot reset port %d (err = %d)\n",
port, status);
else {
status = hub_port_wait_reset(dev, port, delay,
portstat);
if (status && status != -ENOTCONN)
USB_HUB_PRINTF("port_wait_reset: err = %d\n",
status);
}
/* return on disconnect or reset */
switch (status) {
case 0:
/* TRSTRCY = 10 ms; plus some extra */
mdelay(10 + 40);
/* FALL THROUGH */
case -1:
case -ENOTCONN:
/* we have finished trying to reset, so return */
usb_clear_port_feature(dev,
port + 1, USB_PORT_FEAT_C_RESET);
return 0;
}
USB_HUB_PRINTF (
"port %d not enabled, trying reset again...\n",
port);
delay = HUB_LONG_RESET_TIME;
}
if (tries == MAX_TRIES) {
USB_HUB_PRINTF("Cannot enable port %i after %i retries, " \
"disabling port.\n", port + 1, MAX_TRIES);
USB_HUB_PRINTF("Maybe the USB cable is bad?\n");
return -1;
}
return 0;
}
