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

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Message-ID: <20241107104040.GA5233@www.linux-watchdog.org>
Date: Thu, 7 Nov 2024 11:40:40 +0100
From: Wim Van Sebroeck <wim@...ux-watchdog.org>
To: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
Cc: Yassine Oudjana <y.oudjana@...tonmail.com>,
	Wim Van Sebroeck <wim@...ux-watchdog.org>,
	Guenter Roeck <linux@...ck-us.net>,
	Matthias Brugger <matthias.bgg@...il.com>,
	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

Hi Angelo, Yassine,

> Il 06/11/24 11:47, Yassine Oudjana ha scritto:
> >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>
> 
> I'd be more comfortable with a title like:
> 
> watchdog: mediatek: Make sure system reset gets asserted in mtk_wdt_restart()
> 
> or along those lines, saying what's this commit about, because a generic
> "fix" doesn't really mean anything...
> 
> About the commit description - that's good.
> Btw, I wonder if maintainers can fix the title without you sending a v3...

I added it into linux-watchdog-next and changed the commit description whiledoing that.

Kind regards,
Wim.

> 
> Anyway - you can get my:
> 
> Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
> 
> Cheers!
> Angelo
> 
> >---
> >  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);
> 
>