From patchwork Sun Nov 21 16:56:39 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sam Protsenko X-Patchwork-Id: 517475 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 2AE1CC19775 for ; Sun, 21 Nov 2021 16:57:04 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S238441AbhKURAH (ORCPT ); Sun, 21 Nov 2021 12:00:07 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:42954 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S238414AbhKURAD (ORCPT ); Sun, 21 Nov 2021 12:00:03 -0500 Received: from mail-lf1-x129.google.com (mail-lf1-x129.google.com [IPv6:2a00:1450:4864:20::129]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 79778C06174A for ; Sun, 21 Nov 2021 08:56:57 -0800 (PST) Received: by mail-lf1-x129.google.com with SMTP id z34so69240362lfu.8 for ; Sun, 21 Nov 2021 08:56:57 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=tE2PiK+QMQdzrBf8Dn3otgisMDlF9CZ6ayfu9Pqan/0=; b=wJJjrI9KQ1gy1JLj2pqrhYhpVx2I4yCGCfCY1iXFWeKef6mhs2XYqYDn2ZqIzEEhxn 0T+JG0jQ+iDiILi9nQNWvVbwoxWSvBgYpn9fYJP3/su1EvmLDCePDfTw1TF7CZ/AxW8a kOuZSlMjf5kKegAByRENXn46VmOkdXZWvRB8uh2b/IqjPy5crxVXtQGd9MEL6AT5IsAm +QJIOAD9Z+660bLSRACt7dytw43M8er13Lo2OATzLKLZT5AazBTRgLTx4iZ4qwmIiWIm e5EGvB9bK3lob1Df34SVbQS1mK24pxlQqI22prqpc2zGZNSwZAiupGHwGFtUlYkRwpq5 ZBCA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=tE2PiK+QMQdzrBf8Dn3otgisMDlF9CZ6ayfu9Pqan/0=; b=ycOzuft/OIIXrDSCJcXJqvEjurqHFhWC56H7sCczi+KvQOMFXrId865CT/2gswZBPN lA9rXgBB6SNCWFyUAW6cixnXbu4TyRU4N6uA09eZMFioPrT7eeWWIRIynm3PeVabDh6h QGxDGRXrwvhvSgkPqHXA50WSQdkGNPiqLs3meq/ctQ65h1TkLBWuCrLuLk6YHqQV6f42 Hwjn+rU2UDrQANaizbXzT0dR4FTexh9OHOICz0basmRFD75QF8jJhmgNhKN0Bjez4Dwz 2Lu4T+8G4n5K0xhMi6YkDUJe3NC2dIfgemfYg1WQmBHJoRtqUUAk+K0XaD11I0EZ1C93 A4LA== X-Gm-Message-State: AOAM5324IrdXaJirULFZZ87ALS2hUs59IkvfQxTL3/IiiSWdN0tYEPmO w1EhwGO+Q4sbVw3G2zAyozYOZw== X-Google-Smtp-Source: ABdhPJz+n0rvNN4I1ZmBuqTiIEefxy+ISO/6NkZz+svWmRjzF7gYCrkFN1SmNxZjkbYdqbiaPXQ7ug== X-Received: by 2002:ac2:4e0d:: with SMTP id e13mr49222025lfr.388.1637513815870; Sun, 21 Nov 2021 08:56:55 -0800 (PST) Received: from localhost ([31.134.121.151]) by smtp.gmail.com with ESMTPSA id b43sm601297ljr.64.2021.11.21.08.56.55 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 21 Nov 2021 08:56:55 -0800 (PST) From: Sam Protsenko To: Guenter Roeck , Wim Van Sebroeck Cc: Rob Herring , Krzysztof Kozlowski , linux-watchdog@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-samsung-soc@vger.kernel.org Subject: [PATCH v4 04/12] watchdog: s3c2410: Let kernel kick watchdog Date: Sun, 21 Nov 2021 18:56:39 +0200 Message-Id: <20211121165647.26706-5-semen.protsenko@linaro.org> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20211121165647.26706-1-semen.protsenko@linaro.org> References: <20211121165647.26706-1-semen.protsenko@linaro.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-samsung-soc@vger.kernel.org When "tmr_atboot" module param is set, the watchdog is started in driver's probe. In that case, also set WDOG_HW_RUNNING bit to let watchdog core driver know it's running. This way watchdog core can kick the watchdog for us (if CONFIG_WATCHDOG_HANDLE_BOOT_ENABLED option is enabled), until user space takes control. WDOG_HW_RUNNING bit must be set before registering the watchdog. So the "tmr_atboot" handling code is moved before watchdog registration, to avoid performing the same check twice. This is also logical because WDOG_HW_RUNNING bit makes WDT core expect actually running watchdog. Signed-off-by: Sam Protsenko Reviewed-by: Krzysztof Kozlowski Reviewed-by: Guenter Roeck --- Changes in v4: - Added R-b tag by Guenter Roeck Changes in v3: - Added R-b tag by Krzysztof Kozlowski Changes in v2: - Added explanation on moving the code block to commit message - [PATCH 03/12] handles the case when tmr_atboot is present but valid timeout wasn't found drivers/watchdog/s3c2410_wdt.c | 26 +++++++++++++++----------- 1 file changed, 15 insertions(+), 11 deletions(-) diff --git a/drivers/watchdog/s3c2410_wdt.c b/drivers/watchdog/s3c2410_wdt.c index 00421cf22556..0845c05034a1 100644 --- a/drivers/watchdog/s3c2410_wdt.c +++ b/drivers/watchdog/s3c2410_wdt.c @@ -604,6 +604,21 @@ static int s3c2410wdt_probe(struct platform_device *pdev) wdt->wdt_device.bootstatus = s3c2410wdt_get_bootstatus(wdt); wdt->wdt_device.parent = dev; + /* + * If "tmr_atboot" param is non-zero, start the watchdog right now. Also + * set WDOG_HW_RUNNING bit, so that watchdog core can kick the watchdog. + * + * If we're not enabling the watchdog, then ensure it is disabled if it + * has been left running from the bootloader or other source. + */ + if (tmr_atboot) { + dev_info(dev, "starting watchdog timer\n"); + s3c2410wdt_start(&wdt->wdt_device); + set_bit(WDOG_HW_RUNNING, &wdt->wdt_device.status); + } else { + s3c2410wdt_stop(&wdt->wdt_device); + } + ret = watchdog_register_device(&wdt->wdt_device); if (ret) goto err_cpufreq; @@ -612,17 +627,6 @@ static int s3c2410wdt_probe(struct platform_device *pdev) if (ret < 0) goto err_unregister; - if (tmr_atboot) { - dev_info(dev, "starting watchdog timer\n"); - s3c2410wdt_start(&wdt->wdt_device); - } else { - /* if we're not enabling the watchdog, then ensure it is - * disabled if it has been left running from the bootloader - * or other source */ - - s3c2410wdt_stop(&wdt->wdt_device); - } - platform_set_drvdata(pdev, wdt); /* print out a statement of readiness */