From mboxrd@z Thu Jan 1 00:00:00 1970 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 8E70FC47422 for ; Mon, 26 Jul 2021 15:56:59 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 7759860F38 for ; Mon, 26 Jul 2021 15:56:59 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S236916AbhGZPPn (ORCPT ); Mon, 26 Jul 2021 11:15:43 -0400 Received: from mail.kernel.org ([198.145.29.99]:51076 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S237252AbhGZPKb (ORCPT ); Mon, 26 Jul 2021 11:10:31 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id C12BD6056C; Mon, 26 Jul 2021 15:50:59 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1627314660; bh=0FQ45pWstN+Zlkt7RQ/AP0WjMo6LEH/8ijahYy65CRY=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=sE+LLua/X5Vkrl1HO2wQi4UBC4murCFuEIKVzFd8HefZrlabXbsHLq799xFxSfXCS WQ9O6Zd1scSvoEEku0ike/p00UpX0lMcAIQDj7r1CAFuF/msl/uQWXkYfuXpoUYwwD MYsns64aDVKgnVlRAVtlZv/2NJbEKTWp1EhRhJ6s= 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 4.19 029/120] rtc: max77686: Do not enforce (incorrect) interrupt trigger type Date: Mon, 26 Jul 2021 17:38:01 +0200 Message-Id: <20210726153833.331094468@linuxfoundation.org> X-Mailer: git-send-email 2.32.0 In-Reply-To: <20210726153832.339431936@linuxfoundation.org> References: <20210726153832.339431936@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit 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 4aff349ae301..8e09450d11a6 100644 --- a/drivers/rtc/rtc-max77686.c +++ b/drivers/rtc/rtc-max77686.c @@ -710,8 +710,8 @@ 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); -- 2.30.2