From patchwork Wed Oct 3 22:31:02 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jae Hyun Yoo X-Patchwork-Id: 978570 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Received: from lists.ozlabs.org (lists.ozlabs.org [IPv6:2401:3900:2:1::3]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ozlabs.org (Postfix) with ESMTPS id 42QW2c4g7Gz9sBj for ; Thu, 4 Oct 2018 08:31:20 +1000 (AEST) Authentication-Results: ozlabs.org; dmarc=none (p=none dis=none) header.from=linux.intel.com Received: from lists.ozlabs.org (lists.ozlabs.org [IPv6:2401:3900:2:1::3]) by lists.ozlabs.org (Postfix) with ESMTP id 42QW2b6wnFzF399 for ; Thu, 4 Oct 2018 08:31:19 +1000 (AEST) Authentication-Results: lists.ozlabs.org; dmarc=none (p=none dis=none) header.from=linux.intel.com X-Original-To: linux-aspeed@lists.ozlabs.org Delivered-To: linux-aspeed@lists.ozlabs.org Authentication-Results: lists.ozlabs.org; spf=none (mailfrom) smtp.mailfrom=linux.intel.com (client-ip=134.134.136.126; helo=mga18.intel.com; envelope-from=jae.hyun.yoo@linux.intel.com; receiver=) Authentication-Results: lists.ozlabs.org; dmarc=none (p=none dis=none) header.from=linux.intel.com Received: from mga18.intel.com (mga18.intel.com [134.134.136.126]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 42QW2S5g2qzDrDy; Thu, 4 Oct 2018 08:31:12 +1000 (AEST) X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga002.jf.intel.com ([10.7.209.21]) by orsmga106.jf.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 03 Oct 2018 15:31:09 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.54,337,1534834800"; d="scan'208";a="97208499" Received: from maru.jf.intel.com ([10.54.51.77]) by orsmga002.jf.intel.com with ESMTP; 03 Oct 2018 15:31:09 -0700 From: Jae Hyun Yoo To: Brendan Higgins , Wolfram Sang , Benjamin Herrenschmidt , Joel Stanley , Rob Herring , Mark Rutland , Andrew Jeffery , linux-i2c@vger.kernel.org, openbmc@lists.ozlabs.org, devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-aspeed@lists.ozlabs.org, linux-kernel@vger.kernel.org Subject: [PATCH i2c-next v5 0/5] i2c: aspeed: Add bus idle waiting logic for multi-master use cases Date: Wed, 3 Oct 2018 15:31:02 -0700 Message-Id: <20181003223107.16133-1-jae.hyun.yoo@linux.intel.com> X-Mailer: git-send-email 2.19.0 MIME-Version: 1.0 X-BeenThere: linux-aspeed@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux ASPEED SoC development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Vernon Mauery , Jarkko Nikula , James Feist Errors-To: linux-aspeed-bounces+incoming=patchwork.ozlabs.org@lists.ozlabs.org Sender: "Linux-aspeed" In multi-master environment, this driver's master cannot know exactly when peer master sends data to this driver's slave so a case can be happened that this master tries to send data through the master_xfer function but slave data from peer master is still being processed by this driver. To prevent state corruption in the case, this patch adds checking code if any slave operation is ongoing and it waits up to the bus timeout duration before starting a master_xfer operation. To support this change, it introduces changes on i2c-core-base to make that able to read the bus timeout and master transfer retries count values from device tree properties. Please review this patch set. Thanks, -Jae Changes since v3: - Changed the property name to 'timeout' and made it use the default setting in i2c-core when not specified. Changes since v2: - Changed the property name to 'aspeed,timeout' and made it to update the adapter's timeout configuration. Changes since v1: - Changed define names of timeout related. Jae Hyun Yoo (5): dt-bindings: i2c: Add 'timeout-ms' and '#retries' properties as common optional i2c: Add support for 'timeout-ms' and '#retries' OF properties dt-bindings: i2c: aspeed: Add 'timeout-ms' property as an optional property i2c: aspeed: Remove hard-coded bus timeout value setting i2c: aspeed: Add bus idle waiting logic for multi-master use cases .../devicetree/bindings/i2c/i2c-aspeed.txt | 3 ++ Documentation/devicetree/bindings/i2c/i2c.txt | 6 +++ drivers/i2c/busses/i2c-aspeed.c | 54 +++++++++++++------ drivers/i2c/i2c-core-base.c | 18 ++++++- 4 files changed, 63 insertions(+), 18 deletions(-)