diff options
Diffstat (limited to 'common/usb.c')
| -rw-r--r-- | common/usb.c | 18 |
1 files changed, 17 insertions, 1 deletions
diff --git a/common/usb.c b/common/usb.c index 4d0de4d87e..8d9efe516b 100644 --- a/common/usb.c +++ b/common/usb.c @@ -1064,7 +1064,7 @@ static int usb_prepare_device(struct usb_device *dev, int addr, bool do_read, int usb_select_config(struct usb_device *dev) { - unsigned char *tmpbuf = 0; + unsigned char *tmpbuf = NULL; int err; err = get_descriptor_len(dev, USB_DT_DEVICE_SIZE, USB_DT_DEVICE_SIZE); @@ -1077,6 +1077,14 @@ int usb_select_config(struct usb_device *dev) le16_to_cpus(&dev->descriptor.idProduct); le16_to_cpus(&dev->descriptor.bcdDevice); + /* + * Kingston DT Ultimate 32GB USB 3.0 seems to be extremely sensitive + * about this first Get Descriptor request. If there are any other + * requests in the first microframe, the stick crashes. Wait about + * one microframe duration here (1mS for USB 1.x , 125uS for USB 2.0). + */ + mdelay(1); + /* only support for one config for now */ err = usb_get_configuration_len(dev, 0); if (err >= 0) { @@ -1107,6 +1115,14 @@ int usb_select_config(struct usb_device *dev) "len %d, status %lX\n", dev->act_len, dev->status); return err; } + + /* + * Wait until the Set Configuration request gets processed by the + * device. This is required by at least SanDisk Cruzer Pop USB 2.0 + * and Kingston DT Ultimate 32GB USB 3.0 on DWC2 OTG controller. + */ + mdelay(10); + debug("new device strings: Mfr=%d, Product=%d, SerialNumber=%d\n", dev->descriptor.iManufacturer, dev->descriptor.iProduct, dev->descriptor.iSerialNumber); |