diff options
| author | Bin Meng <bmeng.cn@gmail.com> | 2017-09-18 06:40:43 -0700 |
|---|---|---|
| committer | Marek Vasut <marex@denx.de> | 2017-10-01 16:32:53 +0200 |
| commit | 932bb668bb2464115f2d08abbed44e58cfce9536 (patch) | |
| tree | 7d8b2b0891350bc108cecfdd8f4369312100ed63 /common | |
| parent | c008faa77358bb5b313696dd1d5bb8afa03a6ca2 (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>
Diffstat (limited to 'common')
| -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; } |