From patchwork Wed Apr 21 08:05:04 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: 12215627 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, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,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 6DEA2C433B4 for ; Wed, 21 Apr 2021 08:05:17 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 27F9561158 for ; Wed, 21 Apr 2021 08:05:17 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234235AbhDUIFt (ORCPT ); Wed, 21 Apr 2021 04:05:49 -0400 Received: from mail-m121145.qiye.163.com ([115.236.121.145]:24048 "EHLO mail-m121145.qiye.163.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234116AbhDUIFs (ORCPT ); Wed, 21 Apr 2021 04:05:48 -0400 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 90E7D8003C6; Wed, 21 Apr 2021 16:05:12 +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 V5] watchdog: mtk: support dual mode when the bark irq is available Date: Wed, 21 Apr 2021 16:05:04 +0800 Message-Id: <1618992304-18903-1-git-send-email-wangqing@vivo.com> X-Mailer: git-send-email 2.7.4 X-HM-Spam-Status: e1kfGhgUHx5ZQUtXWQgYFAkeWUFZS1VLWVdZKFlBSE83V1ktWUFJV1kPCR oVCBIfWUFZQkkaS1ZMSUNKTU1DQ01LHh5VEwETFhoSFyQUDg9ZV1kWGg8SFR0UWUFZT0tIVUpKS0 hKTFVLWQY+ X-HM-Sender-Digest: e1kMHhlZQR0aFwgeV1kSHx4VD1lBWUc6NEk6MRw6TT8SMAgjPEMLTh8S MBkKFBlVSlVKTUpDQkJJSEpISENCVTMWGhIXVQwaFRwKEhUcOw0SDRRVGBQWRVlXWRILWUFZTkNV SU5KVUxPVUlISVlXWQgBWUFPQ05MNwY+ X-HM-Tid: 0a78f376321db03akuuu90e7d8003c6 Precedence: bulk List-ID: X-Mailing-List: linux-watchdog@vger.kernel.org Support using irq handling wdt bark first instead of directly resetting. When the watchdog timer expires in dual mode, an interrupt will be triggered first, then the timing restarts. The reset signal will be initiated when the timer expires again. The dual mode is disabled by default. 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. V4: - Remove pretimeout related processing. - Add dual mode control separately. V5: - Fix some formatting and printing problems. Signed-off-by: Wang Qing Reported-by: kernel test robot Reported-by: kernel test robot Reported-by: kernel test robot --- drivers/watchdog/mtk_wdt.c | 36 ++++++++++++++++++++++++++++++++---- 1 file changed, 32 insertions(+), 4 deletions(-) diff --git a/drivers/watchdog/mtk_wdt.c b/drivers/watchdog/mtk_wdt.c index 97ca993..40122f8 --- 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 @@ -57,6 +58,7 @@ static bool nowayout = WATCHDOG_NOWAYOUT; static unsigned int timeout; +static bool dual_mode; struct mtk_wdt_dev { struct watchdog_device wdt_dev; @@ -239,13 +241,23 @@ static int mtk_wdt_start(struct watchdog_device *wdt_dev) return ret; reg = ioread32(wdt_base + WDT_MODE); - reg &= ~(WDT_MODE_IRQ_EN | WDT_MODE_DUAL_EN); + if (dual_mode) + reg |= (WDT_MODE_IRQ_EN | WDT_MODE_DUAL_EN); + else + reg &= ~(WDT_MODE_IRQ_EN | WDT_MODE_DUAL_EN); reg |= (WDT_MODE_EN | WDT_MODE_KEY); iowrite32(reg, wdt_base + WDT_MODE); return 0; } +static irqreturn_t mtk_wdt_isr(int irq, void *arg) +{ + panic("wdt bark!\n"); + + return IRQ_HANDLED; +} + static const struct watchdog_info mtk_wdt_info = { .identity = DRV_NAME, .options = WDIOF_SETTIMEOUT | @@ -267,7 +279,7 @@ 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) @@ -279,6 +291,19 @@ static int mtk_wdt_probe(struct platform_device *pdev) if (IS_ERR(mtk_wdt->wdt_base)) return PTR_ERR(mtk_wdt->wdt_base); + if (dual_mode) { + 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; + } else { + dual_mode = 0; + dev_info(&pdev->dev, "couldn't get wdt irq, set dual_mode = 0\n"); + } + } + mtk_wdt->wdt_dev.info = &mtk_wdt_info; mtk_wdt->wdt_dev.ops = &mtk_wdt_ops; mtk_wdt->wdt_dev.timeout = WDT_MAX_TIMEOUT; @@ -299,8 +324,8 @@ static int mtk_wdt_probe(struct platform_device *pdev) if (unlikely(err)) return err; - dev_info(dev, "Watchdog enabled (timeout=%d sec, nowayout=%d)\n", - mtk_wdt->wdt_dev.timeout, nowayout); + dev_info(dev, "Watchdog enabled (timeout=%d sec, nowayout=%d, + dual_mode=%d)\n", mtk_wdt->wdt_dev.timeout, nowayout, dual_mode); wdt_data = of_device_get_match_data(dev); if (wdt_data) { @@ -368,6 +393,9 @@ module_param(nowayout, bool, 0); MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default=" __MODULE_STRING(WATCHDOG_NOWAYOUT) ")"); +module_param(dual_mode, bool, 0); +MODULE_PARM_DESC(dual_mode, "Dual mode triggers irq before reset (default=0)"); + MODULE_LICENSE("GPL"); MODULE_AUTHOR("Matthias Brugger "); MODULE_DESCRIPTION("Mediatek WatchDog Timer Driver");