diff options
| -rw-r--r-- | payloads/libpayload/drivers/usb/usb.c | 35 |
1 files changed, 26 insertions, 9 deletions
diff --git a/payloads/libpayload/drivers/usb/usb.c b/payloads/libpayload/drivers/usb/usb.c index ffbe005e84..e87e397061 100644 --- a/payloads/libpayload/drivers/usb/usb.c +++ b/payloads/libpayload/drivers/usb/usb.c @@ -149,19 +149,36 @@ get_status (usbdev_t *dev, int intf, int rtype, int len, void *data) return dev->controller->control (dev, IN, sizeof (dr), &dr, len, data); } +/* + * Certain Lexar / Micron USB 2.0 disks will fail the get_descriptor(DT_CFG) + * call due to timing issues. Work around this by making extra attempts on + * failure. + */ +#define GET_DESCRIPTOR_TRIES 3 + int -get_descriptor (usbdev_t *dev, int rtype, int descType, int descIdx, +get_descriptor(usbdev_t *dev, int rtype, int desc_type, int desc_idx, void *data, size_t len) { dev_req_t dr; - - dr.bmRequestType = rtype; - dr.bRequest = GET_DESCRIPTOR; - dr.wValue = descType << 8 | descIdx; - dr.wIndex = 0; - dr.wLength = len; - - return dev->controller->control (dev, IN, sizeof (dr), &dr, len, data); + int fail_tries = 0; + int ret = 0; + + while (fail_tries++ < GET_DESCRIPTOR_TRIES) { + dr.bmRequestType = rtype; + dr.bRequest = GET_DESCRIPTOR; + dr.wValue = desc_type << 8 | desc_idx; + dr.wIndex = 0; + dr.wLength = len; + + ret = dev->controller->control(dev, IN, + sizeof(dr), &dr, len, data); + if (ret) + udelay(10); + else + return 0; + } + return ret; } int |