From patchwork Mon Jun 27 11:14:32 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Stephan Gerhold X-Patchwork-Id: 585625 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id D7501CCA47F for ; Mon, 27 Jun 2022 11:15:08 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234349AbiF0LPI (ORCPT ); Mon, 27 Jun 2022 07:15:08 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:38026 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234462AbiF0LPG (ORCPT ); Mon, 27 Jun 2022 07:15:06 -0400 Received: from mx.kernkonzept.com (serv1.kernkonzept.com [IPv6:2a01:4f8:1c1c:b490::2]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 3C1076541 for ; Mon, 27 Jun 2022 04:15:04 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=kernkonzept.com; s=mx1; h=Content-Transfer-Encoding:MIME-Version:References :In-Reply-To:Message-Id:Date:Subject:Cc:To:From:Sender:Reply-To:Content-Type: Content-ID:Content-Description:Resent-Date:Resent-From:Resent-Sender: Resent-To:Resent-Cc:Resent-Message-ID:List-Id:List-Help:List-Unsubscribe: List-Subscribe:List-Post:List-Owner:List-Archive; bh=Quut41CTcbNvV/XVr89FPyZwaPs+FJ3dqPKYOI7YXYM=; b=I4lr/e0kIZ8RHWVPr40M0bRWfn vof29I7JqNiLz1dyginpnsMefJDk+0A9ux6k/5d9RZz5xQ6gKvy5wN12QZjKb+oUZwkI0Lx+4oXS/ 9Kisg3zcC3Gfga2QsIMPrlroDFAjnaxkz0n+yWPSLsjSDnw4Jtzs75W2C9WPv5+xCT5dvXwKLdz0J 0fWyuELJg1VvWnE2iGm7d4DPSWW5/czNVF570pSxqg+6qFLHrNznvinHuUEseIUY1J2s0ea8hThPh rU2pXBJ2LhZTXlv2nECaOakkWSmYzlyTpW3oe12IJYIHNWqRHp8zkqhKl76VB/cfBmGmcA+yocn1q yBM/VTIA==; Received: from [10.22.3.24] (helo=kernkonzept.com) by mx.kernkonzept.com with esmtpsa (TLS1.3:ECDHE_X25519__RSA_PSS_RSAE_SHA256__AES_256_GCM:256) (Exim 4.94.2) id 1o5mho-006C6l-3K; Mon, 27 Jun 2022 13:15:00 +0200 From: Stephan Gerhold To: Wim Van Sebroeck , Guenter Roeck Cc: Loic Poulain , linux-watchdog@vger.kernel.org, linux-arm-msm@vger.kernel.org, Stephan Gerhold Subject: [PATCH 3/3] watchdog: pm8916_wdt: Handle watchdog enabled by bootloader Date: Mon, 27 Jun 2022 13:14:32 +0200 Message-Id: <20220627111432.2625168-4-stephan.gerhold@kernkonzept.com> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20220627111432.2625168-1-stephan.gerhold@kernkonzept.com> References: <20220627111432.2625168-1-stephan.gerhold@kernkonzept.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-arm-msm@vger.kernel.org The bootloader might already enable the watchdog to catch hangs during the boot process. In that case the kernel needs to ping the watchdog temporarily until userspace is fully started. Add a check for this in the probe() function and set the WDOG_HW_RUNNING flag to make the watchdog core handle this automatically. Signed-off-by: Stephan Gerhold --- drivers/watchdog/pm8916_wdt.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/drivers/watchdog/pm8916_wdt.c b/drivers/watchdog/pm8916_wdt.c index 3fc03fdae466..4ebd1d0cab85 100644 --- a/drivers/watchdog/pm8916_wdt.c +++ b/drivers/watchdog/pm8916_wdt.c @@ -142,6 +142,7 @@ static int pm8916_wdt_probe(struct platform_device *pdev) struct device *dev = &pdev->dev; struct pm8916_wdt *wdt; struct device *parent; + unsigned int val; int err, irq; u8 poff[2]; @@ -198,6 +199,11 @@ static int pm8916_wdt_probe(struct platform_device *pdev) dev_err(dev, "failed to read POFF reason: %d\n", err); } + err = regmap_read(wdt->regmap, wdt->baseaddr + PON_PMIC_WD_RESET_S2_CTL2, + &val); + if (err == 0 && val & S2_RESET_EN_BIT) + set_bit(WDOG_HW_RUNNING, &wdt->wdev.status); + /* Configure watchdog to hard-reset mode */ err = regmap_write(wdt->regmap, wdt->baseaddr + PON_PMIC_WD_RESET_S2_CTL,