Received: by 2002:a05:6a10:8c0a:0:0:0:0 with SMTP id go10csp1699373pxb; Fri, 26 Feb 2021 19:36:10 -0800 (PST) X-Google-Smtp-Source: ABdhPJxXTftaS/Fu02aReyo2I99k8DwTsLgpodbJHeX7Ri0C5yD9tpuiU1dC8dmsUVKNQ9Rpotaz X-Received: by 2002:aa7:d656:: with SMTP id v22mr4438393edr.119.1614396969851; Fri, 26 Feb 2021 19:36:09 -0800 (PST) ARC-Seal: i=1; a=rsa-sha256; t=1614396969; cv=none; d=google.com; s=arc-20160816; b=g9GEN9hAtnZpenDng+Zn9+e7vc1H7S/x5uVrNoAcj+aslHKiD6o2t428WYkk2lUdsD vNLnQcBLi4PokuvahCzrNsYsnviMlVSj5zLsrAI0BCB44FluLByPKriWBFY/PrpIfhQR dWAVi666nzqOXwlwT0kC2ddWKMgFdGDbKfEG6lZvQtHqw7NpxoDhle0uSoxqgs1r6aHy AwveIKwWZ8SpmYqoTBBQZOcb6wdP4gJTi5xxLCFVB+poyRM89hRIS1CkfDdKGbksmswJ 9GtDgbpyAapn/mnE6VdMJBCqjRgoOfLAuVEFZF++2LTRZiTH/n+iAqdNQExSN1xZxPxk nmHA== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:content-transfer-encoding:in-reply-to :mime-version:user-agent:date:message-id:from:references:cc:to :subject; bh=VBzkvDCz5YoAYCkficZQ4uxqmrM7tlZdpvworUIgr+Y=; b=kDjbnNVFGZE59uuZaosGIPl3gZuSx1ytLT79EYBhmKL38sJWehT0PHCDIus3gi+I+k vqGyERm1z7IZhaVaUoyikIQLoY7dlMVK0IgBYM6J5KWAL77AIMaghfrmukNmoR5KkHG3 L7L0tmxEFD+VZ/0doVIFVT7y0LVn3P4Ete2FAVg69xgjWK0mHUt0n4GDWGCJ2ThGwauH dFhjSIKS58qZhCgt9tyIB8DlqPdfkMMyjv/j0jQ/a6ACFzacCaXnC9IRq58MWFd0nuKG Q5EQ9VyBN0S/QB1Qj/23BkwIZ9Biux72nqfUENRUVb0oabYMRRlVCrN7s+YiQ0euuMNw 3yvQ== ARC-Authentication-Results: i=1; mx.google.com; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Return-Path: Received: from vger.kernel.org (vger.kernel.org. [23.128.96.18]) by mx.google.com with ESMTP id g26si101865edr.573.2021.02.26.19.35.48; Fri, 26 Feb 2021 19:36:09 -0800 (PST) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18; Authentication-Results: mx.google.com; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230070AbhB0Dbx (ORCPT + 99 others); Fri, 26 Feb 2021 22:31:53 -0500 Received: from szxga06-in.huawei.com ([45.249.212.32]:12957 "EHLO szxga06-in.huawei.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229915AbhB0Dbw (ORCPT ); Fri, 26 Feb 2021 22:31:52 -0500 Received: from DGGEMS413-HUB.china.huawei.com (unknown [172.30.72.60]) by szxga06-in.huawei.com (SkyGuard) with ESMTP id 4DnX8D4n0szjRwh; Sat, 27 Feb 2021 11:29:48 +0800 (CST) Received: from [10.67.102.118] (10.67.102.118) by DGGEMS413-HUB.china.huawei.com (10.3.19.213) with Microsoft SMTP Server id 14.3.498.0; Sat, 27 Feb 2021 11:31:00 +0800 Subject: Re: [RFC PATCH] USB:XHCI:Modify XHCI driver for USB2.0 controller To: Greg KH CC: , , , References: <1614327697-1021-1-git-send-email-liulongfang@huawei.com> From: liulongfang Message-ID: <87cc8b54-f530-cce0-3ea2-f879436ff5f7@huawei.com> Date: Sat, 27 Feb 2021 11:31:00 +0800 User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:60.0) Gecko/20100101 Thunderbird/60.8.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset="gbk" Content-Transfer-Encoding: 7bit X-Originating-IP: [10.67.102.118] X-CFilter-Loop: Reflected Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 2021/2/26 16:38, Greg KH wrote: > On Fri, Feb 26, 2021 at 04:21:37PM +0800, Longfang Liu wrote: >> Our current XHCI hardware controller has been customized to only >> support USB 2.0 ports. > > That sounds like a spec violation, right? Why do you want to do this? > > greg k-h > . > I hope to support a USB2.0-only mode on the XHCI controller through software configuration. Thanks. Longfang Liu