From patchwork Fri Oct 2 15:23:02 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Christian Eggers X-Patchwork-Id: 11813821 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 7433C112E for ; Fri, 2 Oct 2020 15:25:03 +0000 (UTC) Received: from merlin.infradead.org (merlin.infradead.org [205.233.59.134]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 34BCD206DC for ; Fri, 2 Oct 2020 15:25:03 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="De+RoOjr" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 34BCD206DC Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=arri.de Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=merlin.20170209; h=Sender:Content-Transfer-Encoding: Content-Type:Cc:List-Subscribe:List-Help:List-Post:List-Archive: List-Unsubscribe:List-Id:MIME-Version:Message-ID:Date:Subject:To:From: Reply-To:Content-ID:Content-Description:Resent-Date:Resent-From:Resent-Sender :Resent-To:Resent-Cc:Resent-Message-ID:In-Reply-To:References:List-Owner; bh=wJZKg236hYcHJc79CYPGBerRszrTHoNgkE3+PLowhbw=; b=De+RoOjrMmIRZSap1pFB+ybj+o 7WR8jaH5lp/fkKCLl9TH4mt3m+//OxAs3XT1Qb5/YHjttZD2p80d9QpiQPyMcPwsHCuold7jOOA8l RLcl0XduLNLLEVhYToywqZNKBb1IJQ/NBLkKRxuYdQAKQAwkSx8ZEdQEU44bXsHnt4O4QbFfvihaF OS7lxIYxAkC/TVS6DXiA+OW9sTYzzx1/BvGVbbSGHGPSBe40deMYB897aeU+RRJ7BGyISOzEoFwLJ bTAWqqDN+9wKySX1KHd2b7g4G//+m9MnWCKQALLpuVRk4nZq2uj9X244FrZTIEG+pjn3g7DpypjAk 2HwOq75g==; Received: from localhost ([::1] helo=merlin.infradead.org) by merlin.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1kOMvR-0002TW-Jv; Fri, 02 Oct 2020 15:24:49 +0000 Received: from mailout06.rmx.de ([94.199.90.92]) by merlin.infradead.org with esmtps (Exim 4.92.3 #3 (Red Hat Linux)) id 1kOMvO-0002ST-HS for linux-arm-kernel@lists.infradead.org; Fri, 02 Oct 2020 15:24:47 +0000 Received: from kdin02.retarus.com (kdin02.dmz1.retloc [172.19.17.49]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mailout06.rmx.de (Postfix) with ESMTPS id 4C2v1N4XFpz9w9H; Fri, 2 Oct 2020 17:24:40 +0200 (CEST) Received: from mta.arri.de (unknown [217.111.95.66]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-SHA384 (256/256 bits)) (No client certificate requested) by kdin02.retarus.com (Postfix) with ESMTPS id 4C2v1005yYz2TSBc; Fri, 2 Oct 2020 17:24:20 +0200 (CEST) Received: from N95HX1G2.wgnetz.xx (192.168.54.33) by mta.arri.de (192.168.100.104) with Microsoft SMTP Server (TLS) id 14.3.408.0; Fri, 2 Oct 2020 17:23:57 +0200 From: Christian Eggers To: Oleksij Rempel , Shawn Guo , Sascha Hauer , Fabio Estevam , =?utf-8?q?Uwe_Kleine-K=C3=B6nig?= Subject: [PATCH v2 0/3] i2c: imx: Fix handling of arbitration loss Date: Fri, 2 Oct 2020 17:23:02 +0200 Message-ID: <20201002152305.4963-1-ceggers@arri.de> X-Mailer: git-send-email 2.26.2 MIME-Version: 1.0 X-Originating-IP: [192.168.54.33] X-RMX-ID: 20201002-172422-4C2v1005yYz2TSBc-0@kdin02 X-RMX-SOURCE: 217.111.95.66 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20201002_112446_684415_2ABD9DCD X-CRM114-Status: UNSURE ( 9.58 ) X-CRM114-Notice: Please train this message. X-Spam-Score: -0.7 (/) X-Spam-Report: SpamAssassin version 3.4.4 on merlin.infradead.org summary: Content analysis details: (-0.7 points) pts rule name description ---- ---------------------- -------------------------------------------------- -0.7 RCVD_IN_DNSWL_LOW RBL: Sender listed at https://www.dnswl.org/, low trust [94.199.90.92 listed in list.dnswl.org] -0.0 RCVD_IN_MSPIKE_H2 RBL: Average reputation (+2) [94.199.90.92 listed in wl.mailspike.net] -0.0 SPF_PASS SPF: sender matches SPF record 0.0 SPF_HELO_NONE SPF: HELO does not publish an SPF Record X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, NXP Linux Team , Pengutronix Kernel Team , linux-i2c@vger.kernel.org Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org Changes in v2: --------------- - Don't accidently clear additional status flags on Vybrid (reported by Uwe Kleine-Koenig) On my (noisy) system, I2C arbitration losses happen quite often. In it's current implementation, the IAL flag is partly handled, but has a number of shortcomings: 1. The driver runs unnecessarily in a timeout when waiting for an interrupt. 2. The driver performs 500 ms busy-waiting without any value. 3. Arbitration loss errors may be reported one transfer later than they occured. Best regards Christian