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authorJulius Werner <jwerner@chromium.org>2015-10-26 11:44:00 -0700
committerPatrick Georgi <pgeorgi@google.com>2015-10-29 21:06:45 +0100
commit8db7e6702b58f99d0e5be5311772b31c16a61633 (patch)
tree6b7c65f2283f3576560677747385056e29538a8f /payloads/libpayload/drivers/usb
parent564fbbeac93231bacf6b64d3da6595d1a6f86be1 (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.c3
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);