diff options
author | Bin Meng <bmeng.cn@gmail.com> | 2017-09-18 06:40:43 -0700 |
---|---|---|
committer | Philipp Tomsich <philipp.tomsich@theobroma-systems.com> | 2017-10-02 11:20:56 +0200 |
commit | d44eb288090a7db8decfe72807fe84cc91fc969a (patch) | |
tree | 93a25a2cb47a5abb7607f7b8c2b0df4479868218 | |
parent | ec0d95703330d7ada59e0ae14e1281254828c54f (diff) |
usb: Read device descriptor after device is addressed for xHCI
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>
Reviewed-by: Stefan Roese <sr@denx.de>
Tested-by: Stefan Roese <sr@denx.de>
-rw-r--r-- | common/usb.c | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/common/usb.c b/common/usb.c index 88cee810fa..8d27bc7060 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; } |