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=-0.6 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED 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 4E245C2BA1B for ; Sun, 5 Apr 2020 21:41:10 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 0F91F20731 for ; Sun, 5 Apr 2020 21:41:10 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=gmx.net header.i=@gmx.net header.b="Cfer6HJR" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727736AbgDEVlJ (ORCPT ); Sun, 5 Apr 2020 17:41:09 -0400 Received: from mout.gmx.net ([212.227.15.19]:44335 "EHLO mout.gmx.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726887AbgDEVlI (ORCPT ); Sun, 5 Apr 2020 17:41:08 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=gmx.net; s=badeba3b8450; t=1586122863; bh=zHDc8GRgLA5wNlFBNah8ScqLeFFv9wstN0o9j5Fv2xg=; h=X-UI-Sender-Class:From:To:CC:In-reply-to:Subject:Reply-to: References:Date; b=Cfer6HJRxL8d+OQo67Je8s0XpIyOKL1ybIgom5CENqaKFWgrXLNJ2kycVLku8enea Qsttzpet3waw7BprwyS7VeqsU9tMltkRBihC9lTumMQZ8Lmg34TcLgUlO6VEhjFx7G neirg8QK0fjaQPr/gauA662hxAJ3n9Sb5MmcTJYE= X-UI-Sender-Class: 01bb95c1-4bf8-414a-932a-4f6e2808ef9c Received: from corona.crabdance.com ([173.228.106.188]) by mail.gmx.com (mrgmx005 [212.227.17.190]) with ESMTPSA (Nemesis) id 1MvbFs-1j4Een0HQs-00sfU3; Sun, 05 Apr 2020 23:41:03 +0200 Received: by corona.crabdance.com (Postfix, from userid 1000) id 91F97899799; Sun, 5 Apr 2020 14:40:59 -0700 (PDT) From: Stefan Schaeckeler To: wsa@the-dreams.de CC: luto@kernel.org, linux-i2c@vger.kernel.org, linux-kernel@vger.kernel.org, andy.shevchenko@gmail.com In-reply-to: <20200405180510.GD6313@kunai> (message from Wolfram Sang on Sun, 5 Apr 2020 20:05:10 +0200) Subject: Re: [PATCH 0/1] i2c: imc: Add support for Intel iMC SMBus host controller. Content-Type: text/plain Reply-to: schaecsn@gmx.net References: <1582498270-50674-1-git-send-email-schaecsn@gmx.net> <20200405180510.GD6313@kunai> Message-Id: <20200405214059.91F97899799@corona.crabdance.com> Date: Sun, 5 Apr 2020 14:40:59 -0700 (PDT) X-Provags-ID: V03:K1:jOepkKGAFfNVxHEsj5xp1TFnupuc2G80nKz/gExucwfUDwNtjzs o+NT55lyU9naIUsafOv1rmHLLqJEba1SFMbknPuWFX8Ei2U6aQeYhiduQfr47YdVl+YEWMQ aevlayL3i58crcEBCp6Jpiz7JmWPQgZFMajbA5Dy3IblNz3sW9PUBs7xg5laqHKlrcIfrTK SMxuejQeBQe8jm7ntUvZA== X-UI-Out-Filterresults: notjunk:1;V03:K0:gecnlN20pCc=:k9Yv3QBWiiquqkwCkimDMA vZDht91Z1sEyA819JQwFoXmVr/iE8GKEGmxinWff2mPJXZjhUkeWqJzjjKUymRYku6sxEwKkU b0HDoS+CXTSj5QcHU9i3VMNwew0I9P8ihCH5UH0zU3riIReJUpbkHXYczKmzC5DUaHviyoQw3 mMc5P+vugSldH8UdkONBRALekGn4xrtf81RIVB8J63eQ+wbmCkeD6AKOllXZVBxR133O5lSIX Xo5O03PHQMeIWtdWjYO1KXo9QUfT7sVWuknmOpHXN1gsF2TZwSEUSh8xgOBn7OgdiHJuMXdyf aTGCTSFeIcIFS0X78TzacP0+saEoUlaUPqokdHz+2SBt6thJTTgauz6HfxxbzkUZNAzfAcPhK WJF9xVGH/qL6siN+M6jYIrjeFRSNEiIAnanQsckw2+vF+Yb4zuabN5yEDwI1qSFS3qvl55gIa 0Fw7YUVmWG8HUVOHfLYRVDbaO1UQ1zmM+1adRT8HeRPPTyALK3gyP18/IxugkB4OcfjkeYn2p j57GmzF+3AQwmuzO/KA/wnaoll/vmnDiBAEyKuSiQcDUPO5BwgHQSMrs3Y9CWp+oxeKWOlg2t usenekvgl51YzBPjmiFU+oonfSBeDZ4FV0sC649nO/BU/HEFXwm239WnAFo1tQa9jCq8VY2mk bPyJ7LJ3B2EDEYsZ6OWGmacB3v/4QXXZivz+IB0AvK7cG4Rt3uPzChZh4csMZ9orkrVWn/2+s cQKKJCWuSCumtTRiGpuy6BN56CYzyxW7VSRqeC8YJcF4MeqtRNBxKqybBEs6c0LUXz0LVQF/h VkwHjMuiSAzV6v7JJrbDcZ7NT2hfsukcfYP07JrsZZsDTOsh77dJvl0GT/I+vCKnOgTbkEEZL 8o8j3Jtd+svJg9nlri8trps0XE0D7RQ7DfyxKuGG86Qo4d2xYLJmSWv3A3tOJjfsv2vEhDl0g HPSGVWhwLnTeD4h+uYF1z073jgsA4Pg29P7X40gBnlQ3XF8tswQSLLOiNsiMk/aaboo4C+psY LQSJjhhD/b8Q6/fcib8I4FU5EKMIY2KTXR6XBuB6alENDeO0jFzMkKQZUpfpq+bDPhJHFkV7+ 7G/ORvMPzyTeTNNcvn7ymsMGom0BEM8l0MjOR7h3fQumhjV+qq7aX/jXTBtyCRjbbNBpbi9Ch KzJMwMBeB3olFxeAGejswdDr/ZCoIDCd9BrsRKI0hWjxBjtyJy043k3iZfPcbWM8slvyzMfwh VEgUVJ51RYNWqTbbP Content-Transfer-Encoding: quoted-printable Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hello Wolfram, > > > This patch is based on Andy Lutomirski's iMC SMBus driver patch-set > > > https://lkml.org/lkml/2016/4/28/926. It never made it into the kerne= l. I hope > > > this rewrite will: > > > > > > > > > Overview > > > > > > Modern Intel memory controllers host an SMBus controller and connect= ion to > > > DIMMs and their thermal sensors. The memory controller firmware has = three modes > > > of operation: Closed Loop Thermal Throttling (CLTT), Open Loop Therm= al > > > Throttling (OLTT) and none. > > > > > > - CLTT: The memory controller firmware is periodically accessing the= DIMM > > > temperature sensor over the SMBus. > > > > > > > > > I think this is great! One question, though: what happens if the > > system is in CLTT mode but you disable CLTT and claim the bus for too > > long? For example, if there's an infinite loop or other lockup which > > you have the tsod polling interval set to 0? Does the system catch > > fire or does the system do something intelligent like temporarily > > switching to open loop? > > Any news on this question? Thank you for your interest in this patch. You can read my reply here https://lkml.org/lkml/2020/3/1/216 Stefan