linux-kernel - [PATCH] watchdog: armada_37xx_wdt: Fix .set

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Date:   Tue, 26 Jul 2022 10:56:12 +0200
From:   Pali Rohár <pali@...nel.org>
To:     Marek Behún <kabel@...nel.org>,
        Wim Van Sebroeck <wim@...ux-watchdog.org>,
        Guenter Roeck <linux@...ck-us.net>
Cc:     linux-watchdog@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] watchdog: armada_37xx_wdt: Fix .set_timeout callback

ioctl(WDIOC_SETTIMEOUT) calls .set_timeout and .ping callbacks and it is
expected that it changes current watchdog timeout.

armada_37xx_wdt's .ping callback just reping counter 0 and does not touch
counter 1 used for timeout. So it is needed to set counter 1 to the new
value in .set_timeout callback to ensure ioctl(WDIOC_SETTIMEOUT)
functionality. Fix it.

Fixes: 54e3d9b518c8 ("watchdog: Add support for Armada 37xx CPU watchdog")
Signed-off-by: Pali Rohár <pali@...nel.org>
---
 drivers/watchdog/armada_37xx_wdt.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/watchdog/armada_37xx_wdt.c b/drivers/watchdog/armada_37xx_wdt.c
index 1635f421ef2c..b84cba94b135 100644
--- a/drivers/watchdog/armada_37xx_wdt.c
+++ b/drivers/watchdog/armada_37xx_wdt.c
@@ -179,6 +179,8 @@ static int armada_37xx_wdt_set_timeout(struct watchdog_device *wdt,
 	dev->timeout = (u64)dev->clk_rate * timeout;
 	do_div(dev->timeout, CNTR_CTRL_PRESCALE_MIN);
 
+	set_counter_value(dev, CNTR_ID_WDOG, dev->timeout);
+
 	return 0;
 }
 
-- 
2.20.1