From patchwork Tue Mar 10 12:39:01 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg KH X-Patchwork-Id: 229446 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=-9.8 required=3.0 tests=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=unavailable 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 A7F64C10F27 for ; Tue, 10 Mar 2020 13:36:35 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 8042024677 for ; Tue, 10 Mar 2020 13:36:35 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1583847395; bh=PeHBr6dPrD0S0NEiWd3wlD5q13RzmQoY6W7P6aRl6YY=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=TStowaZPjSqa7+m8kEgeWf8nX+bdvRxj38sjMTBDOFb0j39ykl8nPuNTNXELlixJ5 fZML3SkGDvR/tJivr6KgGujgTP9mjtKRj4nXo+MliduJv7XKDFTDNilLibLz33Pqp3 +ggEwuC/5cWtXV31zaJqpOE/lL/Qt6SXjtaIkEBU= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727388AbgCJMmf (ORCPT ); Tue, 10 Mar 2020 08:42:35 -0400 Received: from mail.kernel.org ([198.145.29.99]:42500 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727372AbgCJMmb (ORCPT ); Tue, 10 Mar 2020 08:42:31 -0400 Received: from localhost (83-86-89-107.cable.dynamic.v4.ziggo.nl [83.86.89.107]) (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 9684324686; Tue, 10 Mar 2020 12:42:30 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1583844151; bh=PeHBr6dPrD0S0NEiWd3wlD5q13RzmQoY6W7P6aRl6YY=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=NH/MPFBLS8DqWyv9H75gaF0Sf8Uf/8der9YR8Ylw6+fa856wJmVQp/JA7y85BnJIs +VcaT5ouYPMAdf+Fh8+Lc/B7Wf0vhbUARmar08DFPuJUIDRd/szs+s++IwREjIyiQy ieUoL92X6CVNmtQwvjiO4EiTONrx9T2IXQmUqY/U= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Marco Felsch , Guenter Roeck , Wim Van Sebroeck , Sasha Levin Subject: [PATCH 4.4 48/72] watchdog: da9062: do not ping the hw during stop() Date: Tue, 10 Mar 2020 13:39:01 +0100 Message-Id: <20200310123613.207595539@linuxfoundation.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20200310123601.053680753@linuxfoundation.org> References: <20200310123601.053680753@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Sender: stable-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: stable@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,