For xHCI it is not possible to read a device descriptor before it has been assigned an address. That's why usb_setup_descriptor() was called with 'do_read' being false. But we really need try to read the device descriptor before starting any real communication with the default control endpoint.
Signed-off-by: Bin Meng <bmeng...@gmail.com> --- common/usb.c | 11 +++++++++++ 1 file changed, 11 insertions(+) diff --git a/common/usb.c b/common/usb.c index 88cee81..8d27bc7 100644 --- a/common/usb.c +++ b/common/usb.c @@ -1052,6 +1052,17 @@ static int usb_prepare_device(struct usb_device *dev, int addr, bool do_read, mdelay(10); /* Let the SET_ADDRESS settle */ + /* + * If we haven't read device descriptor before, read it here + * after device is assigned an address. This is only applicable + * to xHCI so far. + */ + if (!do_read) { + err = usb_setup_descriptor(dev, true); + if (err) + return err; + } + return 0; } -- 2.9.2 _______________________________________________ U-Boot mailing list U-Boot@lists.denx.de https://lists.denx.de/listinfo/u-boot