diff options
| author | Patrick Georgi <pgeorgi@chromium.org> | 2014-11-10 16:50:21 +0100 |
|---|---|---|
| committer | Patrick Georgi <pgeorgi@google.com> | 2015-03-19 23:24:44 +0100 |
| commit | f72d328d1285cfbaef4c0e13199d9e668414e06d (patch) | |
| tree | 8755941618d6bcbfe40c2db42e3a57953d2c98b7 /payloads/libpayload/drivers/usb | |
| parent | 5b1c328619ef9fcc533acf8cd1cf21ab4913b50b (diff) | |
libpayload/usb: wait a millisecond to work around device bugs
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: I0e385702a5259b16fda0a253fc121d8f66e6705c
Signed-off-by: Patrick Georgi <pgeorgi@chromium.org>
Original-Commit-Id: 10bbfda8395af009e7f910cc503f50c2ad969ae8
Original-Change-Id: I6dd5ca34e9f3767003ccb0ca9daaf16116f4a2df
Original-Signed-off-by: Patrick Georgi <pgeorgi@chromium.org>
Original-Reviewed-on: https://chromium-review.googlesource.com/228791
Original-Reviewed-by: Julius Werner <jwerner@chromium.org>
Original-Reviewed-by: Sheng-liang Song <ssl@chromium.org>
Reviewed-on: http://review.coreboot.org/8735
Tested-by: build bot (Jenkins)
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Diffstat (limited to 'payloads/libpayload/drivers/usb')
| -rw-r--r-- | payloads/libpayload/drivers/usb/usb.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/payloads/libpayload/drivers/usb/usb.c b/payloads/libpayload/drivers/usb/usb.c index 53006fff21..54b113ce47 100644 --- a/payloads/libpayload/drivers/usb/usb.c +++ b/payloads/libpayload/drivers/usb/usb.c @@ -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]); |