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authorPatrick Georgi <pgeorgi@chromium.org>2014-11-10 16:50:21 +0100
committerPatrick Georgi <pgeorgi@google.com>2015-03-19 23:24:44 +0100
commitf72d328d1285cfbaef4c0e13199d9e668414e06d (patch)
tree8755941618d6bcbfe40c2db42e3a57953d2c98b7 /payloads/libpayload/drivers
parent5b1c328619ef9fcc533acf8cd1cf21ab4913b50b (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')
-rw-r--r--payloads/libpayload/drivers/usb/usb.c3
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]);