From patchwork Thu Feb 2 09:41:31 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Manikanta Guntupalli X-Patchwork-Id: 649851 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id B4DF8C636D4 for ; Thu, 2 Feb 2023 09:43:19 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232481AbjBBJnS (ORCPT ); Thu, 2 Feb 2023 04:43:18 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:52562 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232468AbjBBJnO (ORCPT ); Thu, 2 Feb 2023 04:43:14 -0500 Received: from NAM11-DM6-obe.outbound.protection.outlook.com (mail-dm6nam11on2064.outbound.protection.outlook.com [40.107.223.64]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id F118C6B02E; Thu, 2 Feb 2023 01:42:51 -0800 (PST) ARC-Seal: i=1; a=rsa-sha256; s=arcselector9901; d=microsoft.com; cv=none; b=IoRL22VMlFZ3bbXU3UgaVQpSy4yGSFG+qzMe2FhVHNJCoOO8DquQwcVYpiEajeF6SWjzSvwH5wrL2Yg7AOitEonI65kB4UUFlq2Dl0E6Nv5sKPOko3plf+u6fcahnc/ymNOyfDLQkZZF69s6Pvb4MuKp/bxurPYjTRzE71nvTSHsMhqDUK8l6rzdo3rpqQBBT6j1d6mAqlb+IKuWv41VIdU8PDIygcHWpmNHtzb/fdqj8dx+DsB0Lr4CwJ+itDPDaFJ3rXKKDkzN+7Y86+0YlBa24BfNCqzcgC1GxcKLtqF0El0GdeZHUGuYq/9fKKXrCBFPoH1mXN4Vy91ukg722g== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=microsoft.com; s=arcselector9901; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-AntiSpam-MessageData-ChunkCount:X-MS-Exchange-AntiSpam-MessageData-0:X-MS-Exchange-AntiSpam-MessageData-1; bh=mgPu9PptTkSQgoFmVCTn+1fmcrugJCaP+yBakgmxo7I=; b=PSplxm/HH4JlQktaD3vsdtobkXiBpLloPUnNOKicFi8ZhgATML6M9PT6Gk+xuNef5qJZXmQP8FCilzkmRfVePNBp4H5At1aIHaRkNLrIrDBBJ3G12iM/kNKo/kqUE7NHTqNvNHuHeUwglwHs0k6tkDffpPeO3hWXUPy4vMgWXadYvcbS8SPytKmqhzo0+lW0uHwMkBtVRkLDZqsGUpAmEQwMoygsRaqR1arPgLyswVsxrYQzugxFIFU3d9CZAjeGgVvfSKbsg71YVxifY/UE20rVaP6BSd1/u3rWxLuQfmLc3WCxxMWtMskAbqTgw/iIJZlMiWV5jWYWT/MmtOgjow== ARC-Authentication-Results: i=1; mx.microsoft.com 1; spf=pass (sender ip is 149.199.62.198) smtp.rcpttodomain=amd.com smtp.mailfrom=xilinx.com; dmarc=fail (p=quarantine sp=quarantine pct=100) action=quarantine header.from=amd.com; dkim=none (message not signed); arc=none DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=xilinx.onmicrosoft.com; s=selector2-xilinx-onmicrosoft-com; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=mgPu9PptTkSQgoFmVCTn+1fmcrugJCaP+yBakgmxo7I=; b=R/2J82HF1Z4f3ZcNgnfj5IBwUoqIoqWB39RVJ0kzIxNtdyvb7WYNcrVL4fNBou+jxshPeDOFV/4NWSlCngN5vrubxlHPU5W57ySybfgMuYjiAcLOQhCBGeCbCPD+ls18oE4GohGJj3Qj0LdCicR9Zbj+LaTVsSa9ry+DjuGDtbo= Received: from BN0PR07CA0003.namprd07.prod.outlook.com (2603:10b6:408:141::15) by DS0PR02MB9430.namprd02.prod.outlook.com (2603:10b6:8:dc::12) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.6064.27; Thu, 2 Feb 2023 09:42:49 +0000 Received: from BN1NAM02FT062.eop-nam02.prod.protection.outlook.com (2603:10b6:408:141:cafe::be) by BN0PR07CA0003.outlook.office365.com (2603:10b6:408:141::15) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.6064.27 via Frontend Transport; Thu, 2 Feb 2023 09:42:49 +0000 X-MS-Exchange-Authentication-Results: spf=pass (sender IP is 149.199.62.198) smtp.mailfrom=xilinx.com; dkim=none (message not signed) header.d=none;dmarc=fail action=quarantine header.from=amd.com; Received-SPF: Pass (protection.outlook.com: domain of xilinx.com designates 149.199.62.198 as permitted sender) receiver=protection.outlook.com; client-ip=149.199.62.198; helo=xsj-pvapexch02.xlnx.xilinx.com; pr=C Received: from xsj-pvapexch02.xlnx.xilinx.com (149.199.62.198) by BN1NAM02FT062.mail.protection.outlook.com (10.13.2.168) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.20.6064.27 via Frontend Transport; Thu, 2 Feb 2023 09:42:49 +0000 Received: from xsj-pvapexch02.xlnx.xilinx.com (172.19.86.41) by xsj-pvapexch02.xlnx.xilinx.com (172.19.86.41) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2507.16; Thu, 2 Feb 2023 01:42:46 -0800 Received: from smtp.xilinx.com (172.19.127.95) by xsj-pvapexch02.xlnx.xilinx.com (172.19.86.41) with Microsoft SMTP Server id 15.1.2507.16 via Frontend Transport; Thu, 2 Feb 2023 01:42:46 -0800 Envelope-to: git@amd.com, manikanta.guntupalli@amd.com, michal.simek@amd.com, shubhrajyoti.datta@amd.com, srinivas.goud@amd.com, manion05gk@gmail.com, robh+dt@kernel.org, krzysztof.kozlowski+dt@linaro.org, linux-arm-kernel@lists.infradead.org, andrew@lunn.ch, devicetree@vger.kernel.org, linux-i2c@vger.kernel.org, linux-kernel@vger.kernel.org Received: from [172.23.64.3] (port=36995 helo=xhdvnc103.xilinx.com) by smtp.xilinx.com with esmtp (Exim 4.90) (envelope-from ) id 1pNW7C-000CLP-BR; Thu, 02 Feb 2023 01:42:46 -0800 Received: by xhdvnc103.xilinx.com (Postfix, from userid 90444) id A27021055BB; Thu, 2 Feb 2023 15:12:22 +0530 (IST) From: Manikanta Guntupalli To: , , , , , , , , CC: , , , , , Raviteja Narayanam Subject: [PATCH V4 2/9] i2c: xiic: Fix Rx and Tx paths in standard mode Date: Thu, 2 Feb 2023 15:11:31 +0530 Message-ID: <1675330898-563-3-git-send-email-manikanta.guntupalli@amd.com> X-Mailer: git-send-email 2.1.1 In-Reply-To: <1675330898-563-1-git-send-email-manikanta.guntupalli@amd.com> References: <1675330898-563-1-git-send-email-manikanta.guntupalli@amd.com> MIME-Version: 1.0 X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: BN1NAM02FT062:EE_|DS0PR02MB9430:EE_ X-MS-Office365-Filtering-Correlation-Id: 30ce2310-a55e-4d69-106a-08db0501d8b2 X-MS-Exchange-SenderADCheck: 0 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:149.199.62.198; CTRY:US; LANG:en; SCL:1; SRV:; IPV:NLI; SFV:NSPM; H:xsj-pvapexch02.xlnx.xilinx.com; PTR:unknown-62-198.xilinx.com; CAT:NONE; SFS:(13230025)(346002)(39860400002)(376002)(396003)(136003)(451199018)(36840700001)(46966006)(40470700004)(82740400003)(356005)(7636003)(36860700001)(83170400001)(40480700001)(70586007)(70206006)(4326008)(41300700001)(8936002)(6266002)(6666004)(40460700003)(83380400001)(2616005)(107886003)(186003)(478600001)(47076005)(82310400005)(36756003)(316002)(42186006)(54906003)(8676002)(110136005)(26005)(42882007)(336012)(2906002)(44832011)(5660300002)(7416002)(102446001)(2101003); DIR:OUT; SFP:1101; X-OriginatorOrg: xilinx.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 02 Feb 2023 09:42:49.0305 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 30ce2310-a55e-4d69-106a-08db0501d8b2 X-MS-Exchange-CrossTenant-Id: 657af505-d5df-48d0-8300-c31994686c5c X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=657af505-d5df-48d0-8300-c31994686c5c; Ip=[149.199.62.198]; Helo=[xsj-pvapexch02.xlnx.xilinx.com] X-MS-Exchange-CrossTenant-AuthSource: BN1NAM02FT062.eop-nam02.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: DS0PR02MB9430 Precedence: bulk List-ID: X-Mailing-List: devicetree@vger.kernel.org From: Raviteja Narayanam repeated start When a combined message request comes from user space, the controller has to initiate repeated start sequence. In standard mode, this repeated start sequence is corrupted if there is still data in the Tx FIFO. So, always make sure that all the bytes are completely transmitted out of the FIFO by waiting for TXEMPTY, if the previous message is of Tx type. Signed-off-by: Raviteja Narayanam Signed-off-by: Manikanta Guntupalli Acked-by: Michal Simek --- drivers/i2c/busses/i2c-xiic.c | 53 +++++++++++++++++++++++++++++++++++ 1 file changed, 53 insertions(+) diff --git a/drivers/i2c/busses/i2c-xiic.c b/drivers/i2c/busses/i2c-xiic.c index 839564054501..86da622e060c 100644 --- a/drivers/i2c/busses/i2c-xiic.c +++ b/drivers/i2c/busses/i2c-xiic.c @@ -61,6 +61,7 @@ enum xiic_endian { * @state: See STATE_ * @singlemaster: Indicates bus is single master * @dynamic: Mode of controller + * @prev_msg_tx: Previous message is Tx */ struct xiic_i2c { struct device *dev; @@ -78,6 +79,7 @@ struct xiic_i2c { enum xilinx_i2c_state state; bool singlemaster; bool dynamic; + bool prev_msg_tx; }; #define XIIC_MSB_OFFSET 0 @@ -280,6 +282,24 @@ static int xiic_clear_rx_fifo(struct xiic_i2c *i2c) return 0; } +static int xiic_wait_tx_empty(struct xiic_i2c *i2c) +{ + u8 isr; + unsigned long timeout; + + timeout = jiffies + XIIC_I2C_TIMEOUT; + for (isr = xiic_getreg32(i2c, XIIC_IISR_OFFSET); + !(isr & XIIC_INTR_TX_EMPTY_MASK); + isr = xiic_getreg32(i2c, XIIC_IISR_OFFSET)) { + if (time_after(jiffies, timeout)) { + dev_err(i2c->dev, "Timeout waiting at Tx empty\n"); + return -ETIMEDOUT; + } + } + + return 0; +} + static int xiic_reinit(struct xiic_i2c *i2c) { int ret; @@ -685,6 +705,20 @@ static void xiic_start_recv(struct xiic_i2c *i2c) local_irq_restore(flags); } else { + /* + * If previous message is Tx, make sure that Tx FIFO is empty + * before starting a new transfer as the repeated start in + * standard mode can corrupt the transaction if there are + * still bytes to be transmitted in FIFO + */ + if (i2c->prev_msg_tx) { + int status; + + status = xiic_wait_tx_empty(i2c); + if (status) + return; + } + cr = xiic_getreg8(i2c, XIIC_CR_REG_OFFSET); /* Set Receive fifo depth */ @@ -739,6 +773,8 @@ static void xiic_start_recv(struct xiic_i2c *i2c) /* Enable interrupts */ xiic_setreg32(i2c, XIIC_DGIER_OFFSET, XIIC_GINTR_ENABLE_MASK); + + i2c->prev_msg_tx = false; } static void xiic_start_send(struct xiic_i2c *i2c) @@ -773,6 +809,19 @@ static void xiic_start_send(struct xiic_i2c *i2c) xiic_fill_tx_fifo(i2c); } else { + /* + * If previous message is Tx, make sure that Tx FIFO is empty + * before starting a new transfer as the repeated start in + * standard mode can corrupt the transaction if there are + * still bytes to be transmitted in FIFO + */ + if (i2c->prev_msg_tx) { + int status; + + status = xiic_wait_tx_empty(i2c); + if (status) + return; + } /* Check if RSTA should be set */ cr = xiic_getreg8(i2c, XIIC_CR_REG_OFFSET); if (cr & XIIC_CR_MSMS_MASK) { @@ -803,6 +852,7 @@ static void xiic_start_send(struct xiic_i2c *i2c) XIIC_INTR_TX_ERROR_MASK | XIIC_INTR_BNB_MASK); } + i2c->prev_msg_tx = true; } static void __xiic_start_xfer(struct xiic_i2c *i2c) @@ -866,6 +916,9 @@ static int xiic_xfer(struct i2c_adapter *adap, struct i2c_msg *msgs, int num) /* Decide standard mode or Dynamic mode */ i2c->dynamic = true; + /* Initialize prev message type */ + i2c->prev_msg_tx = false; + /* * If number of messages is 1 and read length is > 255 bytes, * enter standard mode