From patchwork Wed Apr 14 11:48:49 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: =?utf-8?b?546L5pOO?= X-Patchwork-Id: 12202455 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=-16.8 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER, INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,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 4CDDBC433ED for ; Wed, 14 Apr 2021 11:49:35 +0000 (UTC) Received: from desiato.infradead.org (desiato.infradead.org [90.155.92.199]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id B3761611B0 for ; Wed, 14 Apr 2021 11:49:34 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org B3761611B0 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=vivo.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-mediatek-bounces+linux-mediatek=archiver.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=desiato.20200630; h=Sender:Content-Transfer-Encoding :Content-Type:MIME-Version:List-Subscribe:List-Help:List-Post:List-Archive: List-Unsubscribe:List-Id:Message-Id:Date:Subject:Cc:To:From:Reply-To: Content-ID:Content-Description:Resent-Date:Resent-From:Resent-Sender: Resent-To:Resent-Cc:Resent-Message-ID:In-Reply-To:References:List-Owner; bh=ZLf05ZXnISzIQkLLMH3TPaywx0EauxZMoC5NqbjKDJM=; b=ng79OTfW+MfJj6iorU/UTXvjqc 3Wjt5xsdPSMCjFAK0Yvk091J1y78oZBLgov9wObe5jyKj1MPi3dx6iZTvRhjObTCZb09+5nIklPyu LBdFE0wCVd4/4apiENKMn7Fl9hzupwhDsCxHeuonQbmlOh/AesTLXMXRFmZ2BWuim9HtpZNzGQX5m knUpquyyXohQVGqOijEtj4pcDqD5OblpVR15LVtzwENcz5I14hvkgzF4MEUV5144rE5sLEHvY0OKr pYmPtZaqIMliFU56kz+Pg3L25Mv30BLawM9LfiiCAL6pwQDEGHrtUvPJOXa7U/ZTkBQ+jDu6BHhoz qZMPaIEQ==; Received: from localhost ([::1] helo=desiato.infradead.org) by desiato.infradead.org with esmtp (Exim 4.94 #2 (Red Hat Linux)) id 1lWe1M-00CUuU-Ap; Wed, 14 Apr 2021 11:49:24 +0000 Received: from bombadil.infradead.org ([2607:7c80:54:e::133]) by desiato.infradead.org with esmtps (Exim 4.94 #2 (Red Hat Linux)) id 1lWe13-00CUrS-0d; Wed, 14 Apr 2021 11:49:06 +0000 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.20210309; h=Message-Id:Date:Subject:Cc:To:From: Sender:Reply-To:MIME-Version:Content-Type:Content-Transfer-Encoding: Content-ID:Content-Description:In-Reply-To:References; bh=bEv/GxCxiv9wVrIM0Qh4dEAYnA7Pv5AN1drs0aLRSmA=; b=mhNGxCtXNvTYNPqbN8pRYHPEC3 CkpA6Y9yKtFfiwscJImZEAIBDoeAowZH9Z1e++wUMNQX0EGlDMdF4luVKINn+BcytC9ZazHPZnI3u MnotsUUzMq1/qraEifTz4ltcNOX9sXL7C57A06Lz3iUBVzGH6xuUuRal2ZbXZYp7sH1mBn9vhTckE flrBR65TmxtcdC4uhmn3mNoI06yxJNadj0z/xfi3h0ij8RPEzuu+v/qJtDhae3N6JIIMEFboUTvv5 EYxFzqxNL4jsh6lmHab0QQCuznVyzcZz0LDn23zBHDILbCasP/HTGQl4j5WcsTGCi+N3L7mYUtPYq QYqJy1wg==; Received: from mail-m121145.qiye.163.com ([115.236.121.145]) by bombadil.infradead.org with esmtps (Exim 4.94 #2 (Red Hat Linux)) id 1lWe0w-007ivZ-S9; Wed, 14 Apr 2021 11:49:01 +0000 Received: from vivo-HP-ProDesk-680-G4-PCI-MT.vivo.xyz (unknown [58.251.74.232]) by mail-m121145.qiye.163.com (Hmail) with ESMTPA id 04A988004B0; Wed, 14 Apr 2021 19:48:53 +0800 (CST) From: Wang Qing To: Wim Van Sebroeck , Guenter Roeck , Matthias Brugger , linux-watchdog@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-mediatek@lists.infradead.org, linux-kernel@vger.kernel.org Cc: Wang Qing Subject: [PATCH V3] watchdog: mtk: support pre-timeout when the bark irq is available Date: Wed, 14 Apr 2021 19:48:49 +0800 Message-Id: <1618400929-17013-1-git-send-email-wangqing@vivo.com> X-Mailer: git-send-email 2.7.4 X-HM-Spam-Status: e1kfGhgUHx5ZQUtXWQgYFAkeWUFZS1VLWVdZKFlBSE83V1ktWUFJV1kPCR oVCBIfWUFZGh9MSFZPHRkYQ0IYThhLSUxVEwETFhoSFyQUDg9ZV1kWGg8SFR0UWUFZT0tIVUpKS0 hKTFVLWQY+ X-HM-Sender-Digest: e1kMHhlZQR0aFwgeV1kSHx4VD1lBWUc6Mwg6PDo4Ez8XFhNPAksqPzNR M0IaCyFVSlVKTUpDT0tLQkhPTU5PVTMWGhIXVQwaFRwKEhUcOw0SDRRVGBQWRVlXWRILWUFZTkNV SU5KVUxPVUlISVlXWQgBWUFOSkNMNwY+ X-HM-Tid: 0a78d036799eb03akuuu04a988004b0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210414_044859_092804_081B2D39 X-CRM114-Status: GOOD ( 17.91 ) X-BeenThere: linux-mediatek@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Sender: "Linux-mediatek" Errors-To: linux-mediatek-bounces+linux-mediatek=archiver.kernel.org@lists.infradead.org Use the bark interrupt as the pretimeout notifier if available. By default, the pretimeout notification shall occur one second earlier than the timeout. V2: - panic() by default if WATCHDOG_PRETIMEOUT_GOV is not enabled. V3: - Modify the pretimeout behavior, manually reset after the pretimeout - is processed and wait until timeout. Signed-off-by: Wang Qing --- drivers/watchdog/mtk_wdt.c | 62 ++++++++++++++++++++++++++++++++++++++++++---- 1 file changed, 57 insertions(+), 5 deletions(-) diff --git a/drivers/watchdog/mtk_wdt.c b/drivers/watchdog/mtk_wdt.c index 97ca993..7bef1e3 --- a/drivers/watchdog/mtk_wdt.c +++ b/drivers/watchdog/mtk_wdt.c @@ -25,6 +25,7 @@ #include #include #include +#include #define WDT_MAX_TIMEOUT 31 #define WDT_MIN_TIMEOUT 1 @@ -234,18 +235,46 @@ static int mtk_wdt_start(struct watchdog_device *wdt_dev) void __iomem *wdt_base = mtk_wdt->wdt_base; int ret; - ret = mtk_wdt_set_timeout(wdt_dev, wdt_dev->timeout); + ret = mtk_wdt_set_timeout(wdt_dev, wdt_dev->timeout - wdt_dev->pretimeout); if (ret < 0) return ret; reg = ioread32(wdt_base + WDT_MODE); - reg &= ~(WDT_MODE_IRQ_EN | WDT_MODE_DUAL_EN); + reg &= ~WDT_MODE_IRQ_EN; + if (wdt_dev->pretimeout) + reg |= WDT_MODE_IRQ_EN; + else + reg &= ~WDT_MODE_IRQ_EN; reg |= (WDT_MODE_EN | WDT_MODE_KEY); iowrite32(reg, wdt_base + WDT_MODE); return 0; } +static int mtk_wdt_set_pretimeout(struct watchdog_device *wdd, + unsigned int timeout) +{ + wdd->pretimeout = timeout; + return mtk_wdt_start(wdd); +} + +static irqreturn_t mtk_wdt_isr(int irq, void *arg) +{ + struct watchdog_device *wdd = arg; + struct mtk_wdt_dev *mtk_wdt = watchdog_get_drvdata(wdd); + void __iomem *wdt_base = mtk_wdt->wdt_base; + + watchdog_notify_pretimeout(wdd); + /* + * Guaranteed to be reset when the timeout + * expires under any situations + */ + mdelay(1000*wdd->pretimeout); + writel(WDT_SWRST_KEY, wdt_base + WDT_SWRST); + + return IRQ_HANDLED; +} + static const struct watchdog_info mtk_wdt_info = { .identity = DRV_NAME, .options = WDIOF_SETTIMEOUT | @@ -253,12 +282,21 @@ static const struct watchdog_info mtk_wdt_info = { WDIOF_MAGICCLOSE, }; +static const struct watchdog_info mtk_wdt_pt_info = { + .identity = DRV_NAME, + .options = WDIOF_SETTIMEOUT | + WDIOF_PRETIMEOUT | + WDIOF_KEEPALIVEPING | + WDIOF_MAGICCLOSE, +}; + static const struct watchdog_ops mtk_wdt_ops = { .owner = THIS_MODULE, .start = mtk_wdt_start, .stop = mtk_wdt_stop, .ping = mtk_wdt_ping, .set_timeout = mtk_wdt_set_timeout, + .set_pretimeout = mtk_wdt_set_pretimeout, .restart = mtk_wdt_restart, }; @@ -267,7 +305,7 @@ static int mtk_wdt_probe(struct platform_device *pdev) struct device *dev = &pdev->dev; struct mtk_wdt_dev *mtk_wdt; const struct mtk_wdt_data *wdt_data; - int err; + int err, irq; mtk_wdt = devm_kzalloc(dev, sizeof(*mtk_wdt), GFP_KERNEL); if (!mtk_wdt) @@ -279,7 +317,22 @@ static int mtk_wdt_probe(struct platform_device *pdev) if (IS_ERR(mtk_wdt->wdt_base)) return PTR_ERR(mtk_wdt->wdt_base); - mtk_wdt->wdt_dev.info = &mtk_wdt_info; + irq = platform_get_irq(pdev, 0); + if (irq > 0) { + err = devm_request_irq(&pdev->dev, irq, mtk_wdt_isr, 0, "wdt_bark", + &mtk_wdt->wdt_dev); + if (err) + return err; + + mtk_wdt->wdt_dev.info = &mtk_wdt_pt_info; + mtk_wdt->wdt_dev.pretimeout = 1; + } else { + if (irq == -EPROBE_DEFER) + return -EPROBE_DEFER; + + mtk_wdt->wdt_dev.info = &mtk_wdt_info; + } + mtk_wdt->wdt_dev.ops = &mtk_wdt_ops; mtk_wdt->wdt_dev.timeout = WDT_MAX_TIMEOUT; mtk_wdt->wdt_dev.max_hw_heartbeat_ms = WDT_MAX_TIMEOUT * 1000; @@ -360,7 +413,6 @@ static struct platform_driver mtk_wdt_driver = { }; module_platform_driver(mtk_wdt_driver); - module_param(timeout, uint, 0); MODULE_PARM_DESC(timeout, "Watchdog heartbeat in seconds");