From: Marek Vasut Date: Sun, 30 Oct 2022 22:38:35 +0000 (+0100) Subject: usb: Add 1ms delay after first Get Descriptor request X-Git-Url: http://git.dujemihanovic.xyz/?a=commitdiff_plain;h=3406e9d8afcc8ade8cb3e697be2bcf9cc85c9d04;p=u-boot.git usb: Add 1ms delay after first Get Descriptor request Logitech Unifying Receiver 046d:c52b bcdDevice 12.10 seems sensitive about the first Get Descriptor request. If there are any other requests in the same microframe, the device reports bogus data, first of the descriptor parts is not sent to the host. Wait over one microframe duration before issuing subsequent requests to avoid probe failure with this device, since it can be used to connect USB keyboards. Signed-off-by: Marek Vasut Tested-by: Janne Grunau --- diff --git a/common/usb.c b/common/usb.c index 6fcf1e8428..ae9253dfc0 100644 --- a/common/usb.c +++ b/common/usb.c @@ -999,6 +999,17 @@ static int usb_setup_descriptor(struct usb_device *dev, bool do_read) err = get_descriptor_len(dev, 64, 8); if (err) return err; + + /* + * Logitech Unifying Receiver 046d:c52b bcdDevice 12.10 seems + * sensitive about the first Get Descriptor request. If there + * are any other requests in the same microframe, the device + * reports bogus data, first of the descriptor parts is not + * sent to the host. Wait over one microframe duration here + * (1mS for USB 1.x , 125uS for USB 2.0) to avoid triggering + * the issue. + */ + mdelay(1); } dev->epmaxpacketin[0] = dev->descriptor.bMaxPacketSize0;