From patchwork Tue Nov 17 13:04:23 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg KH X-Patchwork-Id: 325286 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,DKIMWL_WL_HIGH, DKIM_SIGNED, DKIM_VALID, HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH, MAILING_LIST_MULTI, SIGNED_OFF_BY, SPF_HELO_NONE, SPF_PASS, URIBL_BLOCKED, 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 E5CB4C56202 for ; Tue, 17 Nov 2020 13:37:25 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 8F2DF207BC for ; Tue, 17 Nov 2020 13:37:25 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=kernel.org header.i=@kernel.org header.b="yod9E3GA" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1732192AbgKQNhE (ORCPT ); Tue, 17 Nov 2020 08:37:04 -0500 Received: from mail.kernel.org ([198.145.29.99]:47776 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1732651AbgKQNgo (ORCPT ); Tue, 17 Nov 2020 08:36:44 -0500 Received: from localhost (83-86-74-64.cable.dynamic.v4.ziggo.nl [83.86.74.64]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 20571207BC; Tue, 17 Nov 2020 13:36:42 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1605620203; bh=UUm7ZRBD3wqBUSjjgBLp7IAVuFPn4r1LeIH++zy3xtw=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=yod9E3GAhThFM+VkmnR8lnps9rxv+tV4L7miJixsXsGFeIgfSL6ER7udZ1HxNPY4w eMJEmN3WG9M+2MIePNR5xRAg0gdW/DbOExjJT9FiBoKt3zB+4Gi6qHjjDXdKhHxYl6 5mv+0LDQXaZh7kNXfQwmv5+SLmac/SeFOcilk+1I= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Michael Wu , Jarkko Nikula , Wolfram Sang , Sasha Levin Subject: [PATCH 5.9 123/255] i2c: designware: call i2c_dw_read_clear_intrbits_slave() once Date: Tue, 17 Nov 2020 14:04:23 +0100 Message-Id: <20201117122144.929255726@linuxfoundation.org> X-Mailer: git-send-email 2.29.2 In-Reply-To: <20201117122138.925150709@linuxfoundation.org> References: <20201117122138.925150709@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Michael Wu [ Upstream commit 66b92313e2ca9208b5f3ebf5d86e9a818299d8fa ] 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 Signed-off-by: Wolfram Sang Signed-off-by: Sasha Levin --- 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 44974b53a6268..13de01a0f75f0 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);