linux-kernel - [PATCH V3 2/3] watchdog: imgpdc: Set timeout before starting watchdog

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Message-Id: <1428080722-29683-2-git-send-email-abrestic@chromium.org>
Date:	Fri,  3 Apr 2015 10:05:21 -0700
From:	Andrew Bresticker <abrestic@...omium.org>
To:	Wim Van Sebroeck <wim@...ana.be>,
	Guenter Roeck <linux@...ck-us.net>
Cc:	linux-watchdog@...r.kernel.org, linux-kernel@...r.kernel.org,
	Andrew Bresticker <abrestic@...omium.org>,
	Naidu Tellapati <naidu.tellapati@...tec.com>,
	Ezequiel Garcia <ezequiel.garcia@...tec.com>,
	James Hogan <james.hogan@...tec.com>
Subject: [PATCH V3 2/3] watchdog: imgpdc: Set timeout before starting watchdog

Set up the watchdog for the specified timeout before attempting to start it.

Signed-off-by: Naidu Tellapati <naidu.tellapati@...tec.com>
Signed-off-by: Andrew Bresticker <abrestic@...omium.org>
Cc: Ezequiel Garcia <ezequiel.garcia@...tec.com>
Cc: James Hogan <james.hogan@...tec.com>
---
No changes from v2.
Changes from v1:
 - Moved setting of timeout to a helper as suggested by Guenter.
---
 drivers/watchdog/imgpdc_wdt.c | 18 +++++++++++++-----
 1 file changed, 13 insertions(+), 5 deletions(-)

diff --git a/drivers/watchdog/imgpdc_wdt.c b/drivers/watchdog/imgpdc_wdt.c
index d6826a6..ffeb1bf 100644
--- a/drivers/watchdog/imgpdc_wdt.c
+++ b/drivers/watchdog/imgpdc_wdt.c
@@ -84,18 +84,24 @@ static int pdc_wdt_stop(struct watchdog_device *wdt_dev)
 	return 0;
 }
 
+static void __pdc_wdt_set_timeout(struct pdc_wdt_dev *wdt)
+{
+	unsigned long clk_rate = clk_get_rate(wdt->wdt_clk);
+	unsigned int val;
+
+	val = readl(wdt->base + PDC_WDT_CONFIG) & ~PDC_WDT_CONFIG_DELAY_MASK;
+	val |= order_base_2(wdt->wdt_dev.timeout * clk_rate) - 1;
+	writel(val, wdt->base + PDC_WDT_CONFIG);
+}
+
 static int pdc_wdt_set_timeout(struct watchdog_device *wdt_dev,
 			       unsigned int new_timeout)
 {
-	unsigned int val;
 	struct pdc_wdt_dev *wdt = watchdog_get_drvdata(wdt_dev);
-	unsigned long clk_rate = clk_get_rate(wdt->wdt_clk);
 
 	wdt->wdt_dev.timeout = new_timeout;
 
-	val = readl(wdt->base + PDC_WDT_CONFIG) & ~PDC_WDT_CONFIG_DELAY_MASK;
-	val |= order_base_2(new_timeout * clk_rate) - 1;
-	writel(val, wdt->base + PDC_WDT_CONFIG);
+	__pdc_wdt_set_timeout(wdt);
 
 	return 0;
 }
@@ -106,6 +112,8 @@ static int pdc_wdt_start(struct watchdog_device *wdt_dev)
 	unsigned int val;
 	struct pdc_wdt_dev *wdt = watchdog_get_drvdata(wdt_dev);
 
+	__pdc_wdt_set_timeout(wdt);
+
 	val = readl(wdt->base + PDC_WDT_CONFIG);
 	val |= PDC_WDT_CONFIG_ENABLE;
 	writel(val, wdt->base + PDC_WDT_CONFIG);
-- 
2.2.0.rc0.207.ga3a616c

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