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

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Date:   Tue, 9 Jul 2019 07:26:38 +0000
From:   <Eugen.Hristev@...rochip.com>
To:     <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>, <wim@...ux-watchdog.org>,
        <linux-watchdog@...r.kernel.org>, <linux@...ck-us.net>
CC:     <Nicolas.Ferre@...rochip.com>, <Eugen.Hristev@...rochip.com>
Subject: [PATCH RESEND] 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.

Reviewed-by: Guenter Roeck <linux@...ck-us.net>
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 b8da1bf..5afe10c 100644
--- a/drivers/watchdog/sama5d4_wdt.c
+++ b/drivers/watchdog/sama5d4_wdt.c
@@ -110,9 +110,7 @@ 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
@@ -248,7 +246,7 @@ 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