From patchwork Mon Jul 26 15:38:19 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg Kroah-Hartman X-Patchwork-Id: 486597 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=-19.5 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER, INCLUDES_PATCH, MAILING_LIST_MULTI, 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 34191C43214 for ; Mon, 26 Jul 2021 15:46:15 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 1F52860F02 for ; Mon, 26 Jul 2021 15:46:15 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235414AbhGZPFp (ORCPT ); Mon, 26 Jul 2021 11:05:45 -0400 Received: from mail.kernel.org ([198.145.29.99]:46126 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235759AbhGZPFa (ORCPT ); Mon, 26 Jul 2021 11:05:30 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id 208C560F02; Mon, 26 Jul 2021 15:45:57 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1627314358; bh=l0Cw9TsyCc7qYbac/t7+DIPSgHI2IXBGitlxGGgv+sY=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=wQsIoqqqi4h/mofwscmKqxVJSVTnHqcFIUIYbWon4LRZ1Woq2klq5Zpy51XKdjV1I H3HjefmykLX1EbsLaRr/DHhA23V8bAJq/4Iyp+mYcUfoFb7tquKmwRroJvv6evyOvB Tq9RSudfuoRgAOhtBORmGz7K6mECkZI9nLCYM+Ko= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Krzysztof Kozlowski , Alexandre Belloni , Sasha Levin Subject: [PATCH 4.14 19/82] rtc: max77686: Do not enforce (incorrect) interrupt trigger type Date: Mon, 26 Jul 2021 17:38:19 +0200 Message-Id: <20210726153828.783103742@linuxfoundation.org> X-Mailer: git-send-email 2.32.0 In-Reply-To: <20210726153828.144714469@linuxfoundation.org> References: <20210726153828.144714469@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Krzysztof Kozlowski [ Upstream commit 742b0d7e15c333303daad4856de0764f4bc83601 ] Interrupt line can be configured on different hardware in different way, even inverted. Therefore driver should not enforce specific trigger type - edge falling - but instead rely on Devicetree to configure it. The Maxim 77686 datasheet describes the interrupt line as active low with a requirement of acknowledge from the CPU therefore the edge falling is not correct. The interrupt line is shared between PMIC and RTC driver, so using level sensitive interrupt is here especially important to avoid races. With an edge configuration in case if first PMIC signals interrupt followed shortly after by the RTC, the interrupt might not be yet cleared/acked thus the second one would not be noticed. Signed-off-by: Krzysztof Kozlowski Signed-off-by: Alexandre Belloni Link: https://lore.kernel.org/r/20210526172036.183223-6-krzysztof.kozlowski@canonical.com Signed-off-by: Sasha Levin --- drivers/rtc/rtc-max77686.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/rtc/rtc-max77686.c b/drivers/rtc/rtc-max77686.c index 182fdd00e290..ecd61573dd31 100644 --- a/drivers/rtc/rtc-max77686.c +++ b/drivers/rtc/rtc-max77686.c @@ -718,8 +718,8 @@ static int max77686_init_rtc_regmap(struct max77686_rtc_info *info) add_rtc_irq: ret = regmap_add_irq_chip(info->rtc_regmap, info->rtc_irq, - IRQF_TRIGGER_FALLING | IRQF_ONESHOT | - IRQF_SHARED, 0, info->drv_data->rtc_irq_chip, + IRQF_ONESHOT | IRQF_SHARED, + 0, info->drv_data->rtc_irq_chip, &info->rtc_irq_data); if (ret < 0) { dev_err(info->dev, "Failed to add RTC irq chip: %d\n", ret);