diff options
| author | Julius Werner <jwerner@chromium.org> | 2015-10-26 11:44:00 -0700 |
|---|---|---|
| committer | Patrick Georgi <pgeorgi@google.com> | 2015-10-29 21:06:45 +0100 |
| commit | 8db7e6702b58f99d0e5be5311772b31c16a61633 (patch) | |
| tree | 6b7c65f2283f3576560677747385056e29538a8f /payloads/libpayload/drivers/usb | |
| parent | 564fbbeac93231bacf6b64d3da6595d1a6f86be1 (diff) | |
libpayload: usbmsc: Add small delay during initialization to fix CZ60
We found that some SanDisk Cruizer Glide CZ60 sticks (confirmed on 16GB
and 64GB versions) have a problem responding to our first GET_MAX_LUNS
request right after they received their SET_CONFIGURATION. They will
continually return a NAK until the host gives up (which is 2
user-noticable seconds for us). Adding a small delay of about 15us seems
to be enough to fix the issue, but let's do 50 to be save.
Confirmed with both MT8173 and Intel LynxPoint XHCI controllers.
BRANCH=None
BUG=chrome-os-partner:45473
TEST=No notable delay before detecting stick on Oak and Falco.
Change-Id: Ib03944d6484de0ccecbb9922d22666f54c9d53dd
Signed-off-by: Patrick Georgi <pgeorgi@chromium.org>
Original-Commit-Id: 589f19a901275fb8b00de4595763a7d577bed524
Original-Change-Id: I95c79fe40d3ad79f37ce2eb586836e5de55be454
Original-Signed-off-by: Julius Werner <jwerner@chromium.org>
Original-Reviewed-on: https://chromium-review.googlesource.com/308980
Original-Reviewed-by: Patrick Georgi <pgeorgi@chromium.org>
Reviewed-on: http://review.coreboot.org/12229
Tested-by: build bot (Jenkins)
Reviewed-by: Patrick Georgi <pgeorgi@google.com>
Diffstat (limited to 'payloads/libpayload/drivers/usb')
| -rw-r--r-- | payloads/libpayload/drivers/usb/usbmsc.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/payloads/libpayload/drivers/usb/usbmsc.c b/payloads/libpayload/drivers/usb/usbmsc.c index ccd693a84d..17313cf88e 100644 --- a/payloads/libpayload/drivers/usb/usbmsc.c +++ b/payloads/libpayload/drivers/usb/usbmsc.c @@ -660,6 +660,9 @@ usb_msc_init (usbdev_t *dev) MSC_INST (dev)->bulk_in->endpoint, MSC_INST (dev)->bulk_out->endpoint); + /* Some sticks need a little more time to get ready after SET_CONFIG. */ + udelay(50); + initialize_luns (dev); usb_debug (" has %d luns\n", MSC_INST (dev)->num_luns); |