From patchwork Tue Oct 6 16:08:13 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Christian Eggers X-Patchwork-Id: 11818931 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 83FFE14F7 for ; Tue, 6 Oct 2020 16:12:24 +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 5670F206D4 for ; Tue, 6 Oct 2020 16:12:24 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="yyAHK3kW" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 5670F206D4 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:References:In-Reply-To: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:List-Owner; bh=TBiAlQS90RELD4UFbgZVQgCOqfu8BX56cAPtO6lzevs=; b=yyAHK3kWIAbbhSCkKYl11mF9R 0EGtC7nXlCiyc1kkLQSktWKLvlsgE/99k5y6gJl5WErdR+EKgUWp2zwiQp7bygngFfPWmuH9aHARy J7svXnEUQ3p2u5wM4G8jppzqUA0DjKRQmDDEbmBEX1HWr8D3NU+dCrbBBwGy3Og8kA+ZAh7ol2VIX AwuaT067J71+LS6nv+/IltxRkQ1J6pZRoyhtkXtLGGpDZY1/sCCtDZtuYBTS0/1DY/N5wcCyzWmi7 w6vmLWYouSfYgF7RizBKhlJGuszA0V3FisbZLAEO1wbv83RzNJ779H87fdt7yatebk+Kci/NL9Zey FffuCvXQQ==; Received: from localhost ([::1] helo=merlin.infradead.org) by merlin.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1kPpYL-0004fj-Kg; Tue, 06 Oct 2020 16:11:01 +0000 Received: from mailout11.rmx.de ([94.199.88.76]) by merlin.infradead.org with esmtps (Exim 4.92.3 #3 (Red Hat Linux)) id 1kPpYK-0004f7-0N for linux-arm-kernel@lists.infradead.org; Tue, 06 Oct 2020 16:11:00 +0000 Received: from kdin01.retarus.com (kdin01.dmz1.retloc [172.19.17.48]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mailout11.rmx.de (Postfix) with ESMTPS id 4C5Mrw5w11z40qX; Tue, 6 Oct 2020 18:10:56 +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 kdin01.retarus.com (Postfix) with ESMTPS id 4C5Mqn6vl6z2xZn; Tue, 6 Oct 2020 18:09:57 +0200 (CEST) Received: from N95HX1G2.wgnetz.xx (192.168.54.45) by mta.arri.de (192.168.100.104) with Microsoft SMTP Server (TLS) id 14.3.408.0; Tue, 6 Oct 2020 18:09:33 +0200 From: Christian Eggers To: Oleksij Rempel , Shawn Guo , Sascha Hauer , Fabio Estevam , =?utf-8?q?Uwe_Kleine-K=C3=B6nig?= , "David Laight" Subject: [PATCH v4 2/3] i2c: imx: Check for I2SR_IAL after every byte Date: Tue, 6 Oct 2020 18:08:13 +0200 Message-ID: <20201006160814.22047-3-ceggers@arri.de> X-Mailer: git-send-email 2.26.2 In-Reply-To: <20201006160814.22047-1-ceggers@arri.de> References: <20201006160814.22047-1-ceggers@arri.de> MIME-Version: 1.0 X-Originating-IP: [192.168.54.45] X-RMX-ID: 20201006-181001-4C5Mqn6vl6z2xZn-0@kdin01 X-RMX-SOURCE: 217.111.95.66 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20201006_121100_163084_5FCDA4B1 X-CRM114-Status: GOOD ( 14.89 ) 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 ---- ---------------------- -------------------------------------------------- -0.0 RCVD_IN_MSPIKE_H2 RBL: Average reputation (+2) [94.199.88.76 listed in wl.mailspike.net] -0.7 RCVD_IN_DNSWL_LOW RBL: Sender listed at https://www.dnswl.org/, low trust [94.199.88.76 listed in list.dnswl.org] -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-kernel@vger.kernel.org, stable@vger.kernel.org, NXP Linux Team , Pengutronix Kernel Team , Christian Eggers , linux-arm-kernel@lists.infradead.org, linux-i2c@vger.kernel.org Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org Arbitration Lost (IAL) can happen after every single byte transfer. If arbitration is lost, the I2C hardware will autonomously switch from master mode to slave. If a transfer is not aborted in this state, consecutive transfers will not be executed by the hardware and will timeout. Signed-off-by: Christian Eggers Cc: stable@vger.kernel.org --- drivers/i2c/busses/i2c-imx.c | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/drivers/i2c/busses/i2c-imx.c b/drivers/i2c/busses/i2c-imx.c index cbdcab73a055..63575af41c09 100644 --- a/drivers/i2c/busses/i2c-imx.c +++ b/drivers/i2c/busses/i2c-imx.c @@ -490,6 +490,16 @@ static int i2c_imx_trx_complete(struct imx_i2c_struct *i2c_imx, bool atomic) dev_dbg(&i2c_imx->adapter.dev, "<%s> Timeout\n", __func__); return -ETIMEDOUT; } + + /* check for arbitration lost */ + if (i2c_imx->i2csr & I2SR_IAL) { + dev_dbg(&i2c_imx->adapter.dev, "<%s> Arbitration lost\n", __func__); + i2c_imx_clear_irq(i2c_imx, I2SR_IAL); + + i2c_imx->i2csr = 0; + return -EAGAIN; + } + dev_dbg(&i2c_imx->adapter.dev, "<%s> TRX complete\n", __func__); i2c_imx->i2csr = 0; return 0;