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Try a port reset if initial contact to a device failed.

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tested by:	Lee Damon <nomad@castle.org>
This commit is contained in:
Bernd Walter 2003-09-01 07:47:42 +00:00
parent f02e8e8122
commit c4bc00e509
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=119650
1 changed files with 4 additions and 1 deletions
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5
sys/dev/usb/usb_subr.c
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@ -971,6 +971,7 @@ usbd_new_device(device_ptr_t parent, usbd_bus_handle bus, int depth,
usbd_device_handle dev;
struct usbd_device *hub;
usb_device_descriptor_t *dd;
usb_port_status_t ps;
usbd_status err;
int addr;
int i;
@ -1027,12 +1028,14 @@ usbd_new_device(device_ptr_t parent, usbd_bus_handle bus, int depth,
up->device = dev;
dd = &dev->ddesc;
/* Try a few times in case the device is slow (i.e. outside specs.) */
for (i = 0; i < 3; i++) {
for (i = 0; i < 15; i++) {
/* Get the first 8 bytes of the device descriptor. */
err = usbd_get_desc(dev, UDESC_DEVICE, 0, USB_MAX_IPACKET, dd);
if (!err)
break;
usbd_delay_ms(dev, 200);
if ((i & 3) == 3)
usbd_reset_port(up->parent, port, &ps);
}
if (err) {
DPRINTFN(-1, ("usbd_new_device: addr=%d, getting first desc "