linux-kernel - [PATCH 3.13 120/198] watchdog: kempld-wdt: Use the correct value when configuring the prescaler with the watchdog

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Message-Id: <1405459868-15089-121-git-send-email-kamal@canonical.com>
Date:	Tue, 15 Jul 2014 14:29:50 -0700
From:	Kamal Mostafa <kamal@...onical.com>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	kernel-team@...ts.ubuntu.com
Cc:	Per Gundberg <per.gundberg@...mera.com>,
	Wim Van Sebroeck <wim@...ana.be>,
	Kamal Mostafa <kamal@...onical.com>
Subject: [PATCH 3.13 120/198] watchdog: kempld-wdt: Use the correct value when configuring the prescaler with the watchdog

3.13.11.5 -stable review patch.  If anyone has any objections, please let me know.

------------------

From: gundberg <per.gundberg@...mera.com>

commit a9e0436b303e94ba57d3bd4b1fcbeaa744b7ebeb upstream.

Use the prescaler index, rather than its value, to configure the watchdog.
This will prevent a mismatch with the prescaler used to calculate the cycles.

Signed-off-by: Per Gundberg <per.gundberg@...mera.com>
Reviewed-by: Guenter Roeck <linux@...ck-us.net>
Reviewed-by: Michael Brunner <michael.brunner@...tron.com>
Tested-by: Michael Brunner <michael.brunner@...tron.com>
Signed-off-by: Wim Van Sebroeck <wim@...ana.be>
Signed-off-by: Kamal Mostafa <kamal@...onical.com>
---
 drivers/watchdog/kempld_wdt.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/watchdog/kempld_wdt.c b/drivers/watchdog/kempld_wdt.c
index 20dc738..d9c1a16 100644
--- a/drivers/watchdog/kempld_wdt.c
+++ b/drivers/watchdog/kempld_wdt.c
@@ -162,7 +162,7 @@ static int kempld_wdt_set_stage_timeout(struct kempld_wdt_data *wdt_data,
 	kempld_get_mutex(pld);
 	stage_cfg = kempld_read8(pld, KEMPLD_WDT_STAGE_CFG(stage->id));
 	stage_cfg &= ~STAGE_CFG_PRESCALER_MASK;
-	stage_cfg |= STAGE_CFG_SET_PRESCALER(prescaler);
+	stage_cfg |= STAGE_CFG_SET_PRESCALER(PRESCALER_21);
 	kempld_write8(pld, KEMPLD_WDT_STAGE_CFG(stage->id), stage_cfg);
 	kempld_write32(pld, KEMPLD_WDT_STAGE_TIMEOUT(stage->id),
 			stage_timeout);
-- 
1.9.1

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