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Date: Sat, 17 Aug 2013 13:58:41 -0700 From: Guenter Roeck <linux@...ck-us.net> To: linux-watchdog@...r.kernel.org Cc: Wim Van Sebroeck <wim@...ana.be>, linux-kernel@...r.kernel.org, Guenter Roeck <linux@...ck-us.net> Subject: [PATCH v3 3/8] watchdog: w83627hf: Enable watchdog device only if not already enabled There is no need to enable the watchdog device if it is already enabled. Also, when enabling the watchdog device, only set the watchdog device enable bit and do not touch other bits; depending on the chip type, those bits may enable other functionality. Signed-off-by: Guenter Roeck <linux@...ck-us.net> --- drivers/watchdog/w83627hf_wdt.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/drivers/watchdog/w83627hf_wdt.c b/drivers/watchdog/w83627hf_wdt.c index bb19368..13bad31 100644 --- a/drivers/watchdog/w83627hf_wdt.c +++ b/drivers/watchdog/w83627hf_wdt.c @@ -101,7 +101,9 @@ static void w83627hf_init(struct watchdog_device *wdog) } outb_p(0x30, WDT_EFER); /* select CR30 */ - outb_p(0x01, WDT_EFDR); /* set bit 0 to activate GPIO2 */ + t = inb(WDT_EFDR); + if (!(t & 0x01)) + outb_p(t | 0x01, WDT_EFDR); /* set bit 0 to activate GPIO2 */ outb_p(0xF6, WDT_EFER); /* Select CRF6 */ t = inb_p(WDT_EFDR); /* read CRF6 */ -- 1.7.9.7 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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