From patchwork Fri Oct 23 05:40:27 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Michael Wu X-Patchwork-Id: 293589 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=-12.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID, HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH, MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=ham 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 6FE24C388F9 for ; Fri, 23 Oct 2020 05:41:25 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id F349F20BED for ; Fri, 23 Oct 2020 05:41:24 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=vivotek.com header.i=@vivotek.com header.b="Y8L2ZT1X" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S371553AbgJWFlY (ORCPT ); Fri, 23 Oct 2020 01:41:24 -0400 Received: from mail.vivotek.com ([60.248.39.150]:37728 "EHLO mail.vivotek.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S371546AbgJWFlX (ORCPT ); Fri, 23 Oct 2020 01:41:23 -0400 Received: from pps.filterd (vivotekpps.vivotek.com [127.0.0.1]) by vivotekpps.vivotek.com (8.16.0.42/8.16.0.42) with SMTP id 09N5d7D1013628; Fri, 23 Oct 2020 13:41:15 +0800 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=vivotek.com; h=from : to : cc : subject : date : message-id : mime-version : content-type; s=dkim; bh=RNqb7CHBD9F9wVVPz+uk8Pad0wWNAw26txn1TZ2nzdc=; b=Y8L2ZT1XlFUT16GcaZ6twLkMeVIV8CE3lj8iLPM/BwKdIKyuo7APpWw8gjoFBqAaHlll 0PWdAYq9aU8Ip8J8KL7ppoKP/QBwGqpgl57sCKTZ9l4Aic+ntiRHEMfbqkDFD7oNYqRg jj1/Fi6/f7JjMZyXsCA/Eg3nbyoSoVDPhV8= Received: from cas01.vivotek.tw ([192.168.0.58]) by vivotekpps.vivotek.com with ESMTP id 349m9fjdsj-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-SHA384 bits=256 verify=NOT); Fri, 23 Oct 2020 13:41:15 +0800 Received: from localhost.localdomain (192.168.17.134) by CAS01.vivotek.tw (192.168.0.58) with Microsoft SMTP Server (TLS) id 14.3.487.0; Fri, 23 Oct 2020 13:41:14 +0800 From: Michael Wu To: Jarkko Nikula , Andy Shevchenko , Mika Westerberg , , CC: Morgan Chang , Michael Wu Subject: [PATCH v3] i2c: designware: call i2c_dw_read_clear_intrbits_slave() once Date: Fri, 23 Oct 2020 13:40:27 +0800 Message-ID: <20201023054027.13540-1-michael.wu@vatics.com> X-Mailer: git-send-email 2.17.1 MIME-Version: 1.0 X-Originating-IP: [192.168.17.134] X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.235, 18.0.737 definitions=2020-10-23_03:2020-10-20,2020-10-23 signatures=0 X-Proofpoint-Spam-Reason: safe Precedence: bulk List-ID: X-Mailing-List: linux-i2c@vger.kernel.org If some bits were cleared by i2c_dw_read_clear_intrbits_slave() in i2c_dw_isr_slave() and not handled immediately, those cleared bits would not be shown again by later i2c_dw_read_clear_intrbits_slave(). They therefore were forgotten to be handled. i2c_dw_read_clear_intrbits_slave() should be called once in an ISR and take its returned state for all later handlings. Signed-off-by: Michael Wu Acked-by: Jarkko Nikula --- Change in v3: - revert deleted braces of 'else' branch in v2 Change in v2: - revert moving I2C_SLAVE_WRITE_REQUESTED reporting in v1 drivers/i2c/busses/i2c-designware-slave.c | 7 +------ 1 file changed, 1 insertion(+), 6 deletions(-) diff --git a/drivers/i2c/busses/i2c-designware-slave.c b/drivers/i2c/busses/i2c-designware-slave.c index 44974b53a626..13de01a0f75f 100644 --- a/drivers/i2c/busses/i2c-designware-slave.c +++ b/drivers/i2c/busses/i2c-designware-slave.c @@ -159,7 +159,6 @@ static int i2c_dw_irq_handler_slave(struct dw_i2c_dev *dev) u32 raw_stat, stat, enabled, tmp; u8 val = 0, slave_activity; - regmap_read(dev->map, DW_IC_INTR_STAT, &stat); regmap_read(dev->map, DW_IC_ENABLE, &enabled); regmap_read(dev->map, DW_IC_RAW_INTR_STAT, &raw_stat); regmap_read(dev->map, DW_IC_STATUS, &tmp); @@ -168,6 +167,7 @@ static int i2c_dw_irq_handler_slave(struct dw_i2c_dev *dev) if (!enabled || !(raw_stat & ~DW_IC_INTR_ACTIVITY) || !dev->slave) return 0; + stat = i2c_dw_read_clear_intrbits_slave(dev); dev_dbg(dev->dev, "%#x STATUS SLAVE_ACTIVITY=%#x : RAW_INTR_STAT=%#x : INTR_STAT=%#x\n", enabled, slave_activity, raw_stat, stat); @@ -188,11 +188,9 @@ static int i2c_dw_irq_handler_slave(struct dw_i2c_dev *dev) val); } regmap_read(dev->map, DW_IC_CLR_RD_REQ, &tmp); - stat = i2c_dw_read_clear_intrbits_slave(dev); } else { regmap_read(dev->map, DW_IC_CLR_RD_REQ, &tmp); regmap_read(dev->map, DW_IC_CLR_RX_UNDER, &tmp); - stat = i2c_dw_read_clear_intrbits_slave(dev); } if (!i2c_slave_event(dev->slave, I2C_SLAVE_READ_REQUESTED, @@ -207,7 +205,6 @@ static int i2c_dw_irq_handler_slave(struct dw_i2c_dev *dev) regmap_read(dev->map, DW_IC_CLR_RX_DONE, &tmp); i2c_slave_event(dev->slave, I2C_SLAVE_STOP, &val); - stat = i2c_dw_read_clear_intrbits_slave(dev); return 1; } @@ -219,7 +216,6 @@ static int i2c_dw_irq_handler_slave(struct dw_i2c_dev *dev) dev_vdbg(dev->dev, "Byte %X acked!", val); } else { i2c_slave_event(dev->slave, I2C_SLAVE_STOP, &val); - stat = i2c_dw_read_clear_intrbits_slave(dev); } return 1; @@ -230,7 +226,6 @@ static irqreturn_t i2c_dw_isr_slave(int this_irq, void *dev_id) struct dw_i2c_dev *dev = dev_id; int ret; - i2c_dw_read_clear_intrbits_slave(dev); ret = i2c_dw_irq_handler_slave(dev); if (ret > 0) complete(&dev->cmd_complete);