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libpayload/usb: wait a millisecond to work around device bugs

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Some USB sticks seem to send a NAK at a place where they mustn't
by spec, leading to a controller side error condition.

To avoid it, wait a millisecond which is enough to get past the
NAK condition. That delay only happens on device discovery so it
won't affect boot time by more than 1ms per device.

BUG=chromium:414959
BRANCH=none
TEST=depthcharge recognizes a Lexar 16GB USB stick after applying
this change.

Change-Id: I6dd5ca34e9f3767003ccb0ca9daaf16116f4a2df
Signed-off-by: Patrick Georgi <pgeorgi@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/228791
Reviewed-by: Julius Werner <jwerner@chromium.org>
Reviewed-by: Sheng-liang Song <ssl@chromium.org>
This commit is contained in:
Patrick Georgi 2014-11-10 16:50:21 +01:00 • committed by chrome-internal-fetch
commit 10bbfda839
1 changed files with 3 additions and 0 deletions
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3
payloads/libpayload/drivers/usb/usb.c
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@ -393,6 +393,9 @@ set_address (hci_t *controller, usb_speed speed, int hubport, int hubaddr)
usb_detach_device (controller, dev->address);
return -1;
}
/* workaround for some USB devices: wait until they're ready, or
* they send a NAK when they're not allowed to do. 1ms is enough */
mdelay(1);
dev->configuration = malloc(buf[1]);
if (!dev->configuration) {
usb_debug ("could not allocate %d bytes for DT_CFG\n", buf[1]);