linux-kernel - [PATCH] watchdog: sama5d4: fix WDD value to be always set to max

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Date:   Wed, 8 May 2019 14:15:03 +0000
From:   <Eugen.Hristev@...rochip.com>
To:     <Nicolas.Ferre@...rochip.com>, <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>, <wim@...ux-watchdog.org>,
        <linux@...ck-us.net>, <linux-watchdog@...r.kernel.org>
CC:     <Eugen.Hristev@...rochip.com>
Subject: [PATCH] watchdog: sama5d4: fix WDD value to be always set to max

From: Eugen Hristev <eugen.hristev@...rochip.com>

WDD value must be always set to max (0xFFF) otherwise the hardware
block will reset the board on the first ping of the watchdog.

Signed-off-by: Eugen Hristev <eugen.hristev@...rochip.com>
---
 drivers/watchdog/sama5d4_wdt.c | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/drivers/watchdog/sama5d4_wdt.c b/drivers/watchdog/sama5d4_wdt.c
index 1e93c1b..d495336 100644
--- a/drivers/watchdog/sama5d4_wdt.c
+++ b/drivers/watchdog/sama5d4_wdt.c
@@ -111,9 +111,7 @@ static int sama5d4_wdt_set_timeout(struct watchdog_device *wdd,
 	u32 value = WDT_SEC2TICKS(timeout);
 
 	wdt->mr &= ~AT91_WDT_WDV;
-	wdt->mr &= ~AT91_WDT_WDD;
 	wdt->mr |= AT91_WDT_SET_WDV(value);
-	wdt->mr |= AT91_WDT_SET_WDD(value);
 
 	/*
 	 * WDDIS has to be 0 when updating WDD/WDV. The datasheet states: When
@@ -251,7 +249,7 @@ static int sama5d4_wdt_probe(struct platform_device *pdev)
 
 	timeout = WDT_SEC2TICKS(wdd->timeout);
 
-	wdt->mr |= AT91_WDT_SET_WDD(timeout);
+	wdt->mr |= AT91_WDT_SET_WDD(WDT_SEC2TICKS(MAX_WDT_TIMEOUT));
 	wdt->mr |= AT91_WDT_SET_WDV(timeout);
 
 	ret = sama5d4_wdt_init(wdt);
-- 
2.7.4