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=-10.1 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,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 2089AC3F2D7 for ; Tue, 3 Mar 2020 02:50:32 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id DEEA0246E2 for ; Tue, 3 Mar 2020 02:50:31 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1583203832; bh=PeHBr6dPrD0S0NEiWd3wlD5q13RzmQoY6W7P6aRl6YY=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=D28rx0aFu44K4qcf1aUKc1wOGFp9gbbhIIIgCnc6r/4Lwwt6qQ8gFijOk/0KDiZlB 8s9WcjtO6OeQZdYQnLZ8VF6p94M1baXcSZG8ZZ/zmuVE25pltr9zlq5JXeGsPkZdM+ lmsxQICMu5sXDYO3mLu3i5/Z8hG7HlwD6js9tRD0= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729182AbgCCCua (ORCPT ); Mon, 2 Mar 2020 21:50:30 -0500 Received: from mail.kernel.org ([198.145.29.99]:47064 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729121AbgCCCuT (ORCPT ); Mon, 2 Mar 2020 21:50:19 -0500 Received: from sasha-vm.mshome.net (c-73-47-72-35.hsd1.nh.comcast.net [73.47.72.35]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 5BD9A246E6; Tue, 3 Mar 2020 02:50:17 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1583203818; bh=PeHBr6dPrD0S0NEiWd3wlD5q13RzmQoY6W7P6aRl6YY=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=NzPlT44XkGw00S3mnk9R4MrmmLRbkmUePArrIEXSJt5KI9nloR9rvOi1OgtBEFj9+ gNxxt3C3y2bDxDX7S1e0TKe7JPG5Py9ecwkOP0s0cmypvTRjwOHmACHA02MJ19p4Yz N/f/4UhYMJ+0stxQH98fCAlCToCJMD1/5+wpID4s= From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Marco Felsch , Guenter Roeck , Wim Van Sebroeck , Sasha Levin , linux-watchdog@vger.kernel.org Subject: [PATCH AUTOSEL 4.9 11/13] watchdog: da9062: do not ping the hw during stop() Date: Mon, 2 Mar 2020 21:50:00 -0500 Message-Id: <20200303025002.10600-11-sashal@kernel.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20200303025002.10600-1-sashal@kernel.org> References: <20200303025002.10600-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Marco Felsch [ Upstream commit e9a0e65eda3f78d0b04ec6136c591c000cbc3b76 ] The da9062 hw has a minimum ping cool down phase of at least 200ms. The driver takes that into account by setting the min_hw_heartbeat_ms to 300ms and the core guarantees that the hw limit is observed for the ping() calls. But the core can't guarantee the required minimum ping cool down phase if a stop() command is send immediately after the ping() command. So it is not allowed to ping the watchdog within the stop() command as the driver does. Remove the ping can be done without doubts because the watchdog gets disabled anyway and a (re)start resets the watchdog counter too. Signed-off-by: Marco Felsch Reviewed-by: Guenter Roeck Link: https://lore.kernel.org/r/20200120091729.16256-1-m.felsch@pengutronix.de [groeck: Updated description] Signed-off-by: Guenter Roeck Signed-off-by: Wim Van Sebroeck Signed-off-by: Sasha Levin --- drivers/watchdog/da9062_wdt.c | 7 ------- 1 file changed, 7 deletions(-) diff --git a/drivers/watchdog/da9062_wdt.c b/drivers/watchdog/da9062_wdt.c index 7386111220d58..daeb645fcea8a 100644 --- a/drivers/watchdog/da9062_wdt.c +++ b/drivers/watchdog/da9062_wdt.c @@ -126,13 +126,6 @@ static int da9062_wdt_stop(struct watchdog_device *wdd) struct da9062_watchdog *wdt = watchdog_get_drvdata(wdd); int ret; - ret = da9062_reset_watchdog_timer(wdt); - if (ret) { - dev_err(wdt->hw->dev, "Failed to ping the watchdog (err = %d)\n", - ret); - return ret; - } - ret = regmap_update_bits(wdt->hw->regmap, DA9062AA_CONTROL_D, DA9062AA_TWDSCALE_MASK, -- 2.20.1