linux-kernel - Re: [PATCH v2 1/2] watchdog: mediatek: Fix mtk_wdt

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Message-ID: <1d801e59-341d-4f2f-88ca-98277731bd83@roeck-us.net>
Date: Wed, 6 Nov 2024 06:57:11 -0800
From: Guenter Roeck <linux@...ck-us.net>
To: Yassine Oudjana <y.oudjana@...tonmail.com>,
 Wim Van Sebroeck <wim@...ux-watchdog.org>,
 Matthias Brugger <matthias.bgg@...il.com>,
 AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
Cc: linux-watchdog@...r.kernel.org, linux-kernel@...r.kernel.org,
 linux-arm-kernel@...ts.infradead.org, linux-mediatek@...ts.infradead.org
Subject: Re: [PATCH v2 1/2] watchdog: mediatek: Fix mtk_wdt_restart

On 11/6/24 02:47, Yassine Oudjana wrote:
> Clear the IRQ enable bit of WDT_MODE before asserting software reset
> in order to make TOPRGU issue a system reset signal instead of an IRQ.
> 
> Fixes: a44a45536f7b ("watchdog: Add driver for Mediatek watchdog")
> Signed-off-by: Yassine Oudjana <y.oudjana@...tonmail.com>

Reviewed-by: Guenter Roeck <linux@...ck-us.net>

> ---
>   drivers/watchdog/mtk_wdt.c | 6 ++++++
>   1 file changed, 6 insertions(+)
> 
> diff --git a/drivers/watchdog/mtk_wdt.c b/drivers/watchdog/mtk_wdt.c
> index c35f85ce8d69c..e2d7a57d6ea2e 100644
> --- a/drivers/watchdog/mtk_wdt.c
> +++ b/drivers/watchdog/mtk_wdt.c
> @@ -225,9 +225,15 @@ static int mtk_wdt_restart(struct watchdog_device *wdt_dev,
>   {
>   	struct mtk_wdt_dev *mtk_wdt = watchdog_get_drvdata(wdt_dev);
>   	void __iomem *wdt_base;
> +	u32 reg;
>   
>   	wdt_base = mtk_wdt->wdt_base;
>   
> +	/* Enable reset in order to issue a system reset instead of an IRQ */
> +	reg = readl(wdt_base + WDT_MODE);
> +	reg &= ~WDT_MODE_IRQ_EN;
> +	writel(reg | WDT_MODE_KEY, wdt_base + WDT_MODE);
> +
>   	while (1) {
>   		writel(WDT_SWRST_KEY, wdt_base + WDT_SWRST);
>   		mdelay(5);