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=-5.3 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED,USER_AGENT_SANE_1 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 B4DEFC4338F for ; Thu, 29 Jul 2021 07:38:51 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 9EEA161057 for ; Thu, 29 Jul 2021 07:38:51 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235519AbhG2Hix (ORCPT ); Thu, 29 Jul 2021 03:38:53 -0400 Received: from relay2.uni-heidelberg.de ([129.206.119.212]:39690 "EHLO relay2.uni-heidelberg.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235587AbhG2HiR (ORCPT ); Thu, 29 Jul 2021 03:38:17 -0400 X-Greylist: delayed 429 seconds by postgrey-1.27 at vger.kernel.org; Thu, 29 Jul 2021 03:38:17 EDT X-IPAS-Result: =?us-ascii?q?A2B/BQCzWAJh/1BqzoFagQmEZhVWbIRHoi2LK4FzAQEBA?= =?us-ascii?q?QEBAQEBCTcHAQIEAQGHVQIlOBMCBAEBAQEDAgMBAQEBAQEDAQEGAQEBAQEGB?= =?us-ascii?q?IEOhWgNhmwwJjUCJgIWKDSCcoMHD6lggTGBAYNNAYRSgUAdBoEQKo4VEIFVR?= =?us-ascii?q?IQKboJLgT8FARIBboJKNoIuBIMSgUFURKxGkWosB4IAgSmBNwuIdZNvBBYrl?= =?us-ascii?q?UyRF5BWkWmZA4F3gQ1wMxokgzhQGQ6XJIVMQi8CNgIGCwEBAwlZAQGJdQEB?= IronPort-HdrOrdr: A9a23:XnMaGKsZmb/I213QTZsCc6iw7skDcdV00zEX/kB9WHVpm62j9/ xG+c5x6faaslwssQ4b6LS90cW7LE8036QFgrX5RI3SPjUO4VHYSb2KjrGC/9SDIULDH4dmvM 9dmsNFZuEYY2IXsS+02njeLz9Z+qjgzJyV X-IronPort-Anti-Spam-Filtered: true Received: from lemon.iwr.uni-heidelberg.de ([129.206.106.80]) by relay2.uni-heidelberg.de with ESMTP/TLS/ECDHE-RSA-AES128-GCM-SHA256; 29 Jul 2021 09:31:02 +0200 Received: from hlauer by lemon.iwr.uni-heidelberg.de with local (Exim 4.92) (envelope-from ) id 1m90VQ-0002Iy-Sc; Thu, 29 Jul 2021 09:31:00 +0200 Date: Thu, 29 Jul 2021 09:31:00 +0200 From: Hermann Lauer To: gregory.clement@bootlin.com Cc: linux-i2c@vger.kernel.org Subject: I2C MV64XXX: Showing Allwinner debug LCR register in bus lock case Message-ID: <20210729073100.GA8757@lemon.iwr.uni-heidelberg.de> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline User-Agent: Mutt/1.10.1 (2018-07-13) Precedence: bulk List-ID: X-Mailing-List: linux-i2c@vger.kernel.org Dear Maintainers, if Allwinner i2c locks, the is a LCR register (reg_base + 0x20), which shows directly the state of the SCL and SDA lines. So you can see which line (if any) is pulled externally low. Is there a similar usefull register in the original MV64XXX MARVELL chip? I'd like to make the patch https://bitbucket.org/hlauer/kernel/src/master/patches/i2c-buslock.patchl working for that chip, too. Thanks for any ideas. Greetings Hermann -- Administration/Zentrale Dienste, Interdiziplinaeres Zentrum fuer wissenschaftliches Rechnen der Universitaet Heidelberg IWR; INF 205; 69120 Heidelberg; Tel: (06221)54-14405 Fax: -14427 Email: Hermann.Lauer@iwr.uni-heidelberg.de