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-rw-r--r--payloads/libpayload/drivers/usb/usb.c35
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