| Message ID | 1500505956-31846-6-git-send-email-bmeng.cn@gmail.com |
|---|---|
| State | Deferred |
| Delegated to: | Marek Vasut |
| Headers | show |
diff --git a/common/usb.c b/common/usb.c index 2aaf932..e469534 100644 --- a/common/usb.c +++ b/common/usb.c @@ -1051,6 +1051,17 @@ 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; }
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.cn@gmail.com> --- Changes in v3: None common/usb.c | 11 +++++++++++ 1 file changed, 11 insertions(+)