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=-0.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS 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 35F57C433FF for ; Mon, 12 Aug 2019 12:47:00 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 10DFA208C2 for ; Mon, 12 Aug 2019 12:47:00 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728496AbfHLMq6 (ORCPT ); Mon, 12 Aug 2019 08:46:58 -0400 Received: from mga07.intel.com ([134.134.136.100]:4684 "EHLO mga07.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726496AbfHLMq6 (ORCPT ); Mon, 12 Aug 2019 08:46:58 -0400 X-Amp-Result: UNKNOWN X-Amp-Original-Verdict: FILE UNKNOWN X-Amp-File-Uploaded: False Received: from fmsmga006.fm.intel.com ([10.253.24.20]) by orsmga105.jf.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 12 Aug 2019 05:46:32 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.64,377,1559545200"; d="asc'?scan'208";a="375932562" Received: from pipin.fi.intel.com (HELO pipin) ([10.237.72.175]) by fmsmga006.fm.intel.com with ESMTP; 12 Aug 2019 05:46:29 -0700 From: Felipe Balbi To: Roger Quadros , Heikki Krogerus , Pawel Laszczak Cc: "gregkh\@linuxfoundation.org" , "linux-usb\@vger.kernel.org" , "linux-kernel\@vger.kernel.org" , "jbergsagel\@ti.com" , "nsekhar\@ti.com" , "nm\@ti.com" , Suresh Punnoose , Jayshri Dajiram Pawar , Rahul Kumar , Anil Joy Varughese Subject: Re: [PATCH v10 5/6] usb:cdns3 Add Cadence USB3 DRD Driver In-Reply-To: References: <1563733939-21214-1-git-send-email-pawell@cadence.com> <1563733939-21214-6-git-send-email-pawell@cadence.com> <88742d5b-ee10-cf4e-6724-58e7bdd19cb9@ti.com> <1e557bcf-2d50-f600-0e81-1f9fba5499a1@ti.com> <20190812103147.GA4691@kuha.fi.intel.com> Date: Mon, 12 Aug 2019 15:46:25 +0300 Message-ID: <874l2mtuu6.fsf@gmail.com> MIME-Version: 1.0 Content-Type: multipart/signed; boundary="=-=-="; micalg=pgp-sha256; protocol="application/pgp-signature" Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org --=-=-= Content-Type: text/plain Content-Transfer-Encoding: quoted-printable Hi, Roger Quadros writes: >> The sysfs file we expose from the class for the role switches is >> primarily meant for supporting proprietary protocols that require us >> to basically override the connector USB data role. The default role >> should always be selected in the drivers. > > OK. Let's take this example > - Port is dual-role port micro AB. > - microAB to type-A adapter is connected which pulls ID low. port transit= ions > to "host" role by the controller driver. > - proprietary protocol want to switch role to device role so writes "devi= ce" to > mode switch sysfs. port transitions to "device" role. > > Now, how does controller driver know to fall back to HW based role switch= ing? Use a 'disconnect' or 'suspend' event to go reset it? But that should, probably, be done at kernel space, no? =2D-=20 balbi --=-=-= Content-Type: application/pgp-signature; name="signature.asc" -----BEGIN PGP SIGNATURE----- iQIzBAEBCAAdFiEElLzh7wn96CXwjh2IzL64meEamQYFAl1RX6EACgkQzL64meEa mQZPthAAoPp+d2wATueMi3bs7y0hgbJbVUAfZwIcaCcrj0vG2JlU62N1tNjJhsP/ xLLRKsXs7FKLNR0XjkYA0fhOjJwCkEjgnxEZOi+OdWi22avG4YQOP+UAXcuBLB7R m95XWGOjvW3Tpfh6Fc3F3cmrdbNhMP/+EA/tsdIKEtDZsNkJtWNAFVCnb2pwuaC2 5oEsqDDgCeTDqNPqSH8T2Afkshwfr/rP7pQBunObvZdohJkR4FPteOnoVlFXIkrD FxBMrIs27xhPywv6U/OeQoCWbvSxnixEvpN7yZzAtZHBt0CuS9w2MvTXQ0l/5Guy +tAuTdtT+g+Ypaxtp8VoO6SmohDO959TEGYm3OuITelPZKdM9rilRXp+agqWqCuD M2qfyD0z6AertZ/XzAESt1MHbpZLWxS2CY9QpDmd5RBM0HyS8TnlYNdXpQYpVi+q FrCqsew6ndcdFG0sr5i5aP5PyidrqMXJeV/hy3MVxbVq2CJATxasC36+ec0oagNO zkmg0zEHB+Kte/tf+QTGCaYZGjWbObPH++m+phTJpO2UN4EU5hcO0qu1AXTGBdEF Qnd1alBJim0s5KJ9+E2CUk7s/9l46f4zeTrCoxRtsbSQiBRPQR/SQcdUBRUVFvxW mPkQlndf37HU1ieYbdm6jC1SkUxtLJmlnv61PJ0I8M8CHwF36Lo= =A2Hp -----END PGP SIGNATURE----- --=-=-=--