Messages in this thread | | | Date | Fri, 10 Aug 2018 06:37:35 -0700 | From | Guenter Roeck <> | Subject | Re: [PATCH v6 10/24] watchdog: jz4740: Avoid starting watchdog in set_timeout |
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On Thu, Aug 09, 2018 at 11:44:00PM +0200, Paul Cercueil wrote: > 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>
> --- > drivers/watchdog/jz4740_wdt.c | 5 ++++- > 1 file changed, 4 insertions(+), 1 deletion(-) > > v6: New patch > > 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; > } > -- > 2.11.0 >
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