From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-2.3 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_2 autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id B454BC0650F for ; Wed, 14 Aug 2019 08:31:55 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 964862133F for ; Wed, 14 Aug 2019 08:31:55 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727586AbfHNIby (ORCPT ); Wed, 14 Aug 2019 04:31:54 -0400 Received: from mx2.suse.de ([195.135.220.15]:43854 "EHLO mx1.suse.de" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1725265AbfHNIby (ORCPT ); Wed, 14 Aug 2019 04:31:54 -0400 X-Virus-Scanned: by amavisd-new at test-mx.suse.de Received: from relay2.suse.de (unknown [195.135.220.254]) by mx1.suse.de (Postfix) with ESMTP id DCA4BAD45; Wed, 14 Aug 2019 08:31:52 +0000 (UTC) Message-ID: <1565771508.25764.3.camel@suse.com> Subject: Re: Strange behaviour of D-Link DUB-1312 USB 3.0 Adapters From: Oliver Neukum To: "Schmid, Carsten" , "f.fainelli@gmail.com" Cc: "linux-usb@vger.kernel.org" Date: Wed, 14 Aug 2019 10:31:48 +0200 In-Reply-To: References: Content-Type: text/plain; charset="UTF-8" X-Mailer: Evolution 3.26.6 Mime-Version: 1.0 Content-Transfer-Encoding: 7bit Sender: linux-usb-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-usb@vger.kernel.org Am Mittwoch, den 14.08.2019, 08:17 +0000 schrieb Schmid, Carsten : > [Resend - had mailer errors ] > > Hi Florian, > > today i have seen a strange behaviour of two D-Link DUB-1312 adapters (same Revision A1). > Plugging them into the same port (!) on my device one of them is recognized as SuperSpeed, the other as high speed ??? > (working on 4.14.129 LTS) > > From dmesg, the "faulty" one: > [ 530.585871] usb 1-2: new high-speed USB device number 4 using xhci_hcd <<<<<<<<< HUH ???? XHCI is not like EHCI. It needs no companion controller, as it serves all speeds. > I had a look at the driver code of ax88179, but that one didn't change much in the past up to v5.2. > Nothing that explains what i can see here. This is on a lower layer than ax88179. This comes from xhci_hcd. Is this a regression? Regards Oliver