[v10,09/27] watchdog: jz4740: Avoid starting watchdog in set_timeout
diff mbox series

Message ID 20190302233413.14813-10-paul@crapouillou.net
State Not Applicable
Headers show
Series
  • Ingenic TCU patchset
Related show

Commit Message

Paul Cercueil March 2, 2019, 11:33 p.m. UTC
Previously the jz4740_wdt_set_timeout() function was starting the timer
unconditionally, even if it was stopped when that function was entered.

Now, the timer will be restarted only if it was already running before
this function is called.

Signed-off-by: Paul Cercueil <paul@crapouillou.net>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Tested-by: Mathieu Malaterre <malat@debian.org>
Tested-by: Artur Rojek <contact@artur-rojek.eu>
---

Notes:
         v6: New patch
    
         v7: No change
    
         v8: No change
    
         v9: No change
    
         v10: No change

 drivers/watchdog/jz4740_wdt.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

Patch
diff mbox series

diff --git a/drivers/watchdog/jz4740_wdt.c b/drivers/watchdog/jz4740_wdt.c
index 0f54306aee25..45d9495170e5 100644
--- a/drivers/watchdog/jz4740_wdt.c
+++ b/drivers/watchdog/jz4740_wdt.c
@@ -64,13 +64,15 @@  static int jz4740_wdt_set_timeout(struct watchdog_device *wdt_dev,
 {
 	struct jz4740_wdt_drvdata *drvdata = watchdog_get_drvdata(wdt_dev);
 	u16 timeout_value = (u16)(drvdata->clk_rate * new_timeout);
+	u32 tcer;
 
+	regmap_read(drvdata->map, TCU_REG_WDT_TCER, &tcer);
 	regmap_write(drvdata->map, TCU_REG_WDT_TCER, 0);
 
 	regmap_write(drvdata->map, TCU_REG_WDT_TDR, timeout_value);
 	regmap_write(drvdata->map, TCU_REG_WDT_TCNT, 0);
 
-	regmap_write(drvdata->map, TCU_REG_WDT_TCER, TCU_WDT_TCER_TCEN);
+	regmap_write(drvdata->map, TCU_REG_WDT_TCER, tcer & TCU_WDT_TCER_TCEN);
 
 	wdt_dev->timeout = new_timeout;
 	return 0;
@@ -86,6 +88,7 @@  static int jz4740_wdt_start(struct watchdog_device *wdt_dev)
 		return ret;
 
 	jz4740_wdt_set_timeout(wdt_dev, wdt_dev->timeout);
+	regmap_write(drvdata->map, TCU_REG_WDT_TCER, TCU_WDT_TCER_TCEN);
 
 	return 0;
 }