From: Xingyu Chen xingyu.chen@amlogic.com
[ Upstream commit 2c77734642d52448aca673e889b39f981110828b ]
The left time value is wrong when we get it by sysfs. The left time value should be equal to preset timeout value minus elapsed time value. According to the Meson-GXB/GXL datasheets which can be found at [0], the timeout value is saved to BIT[0-15] of the WATCHDOG_TCNT, and elapsed time value is saved to BIT[16-31] of the WATCHDOG_TCNT.
Fixes: 683fa50f0e18 ("watchdog: Add Meson GXBB Watchdog Driver") Signed-off-by: Xingyu Chen xingyu.chen@amlogic.com Acked-by: Neil Armstrong narmstrong@baylibre.com Reviewed-by: Kevin Hilman khilman@baylibre.com Reviewed-by: Guenter Roeck linux@roeck-us.net Signed-off-by: Guenter Roeck linux@roeck-us.net Signed-off-by: Wim Van Sebroeck wim@linux-watchdog.org Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/watchdog/meson_gxbb_wdt.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/drivers/watchdog/meson_gxbb_wdt.c b/drivers/watchdog/meson_gxbb_wdt.c index 69adeab3fde70..0a6672789640c 100644 --- a/drivers/watchdog/meson_gxbb_wdt.c +++ b/drivers/watchdog/meson_gxbb_wdt.c @@ -89,8 +89,8 @@ static unsigned int meson_gxbb_wdt_get_timeleft(struct watchdog_device *wdt_dev)
reg = readl(data->reg_base + GXBB_WDT_TCNT_REG);
- return ((reg >> GXBB_WDT_TCNT_CNT_SHIFT) - - (reg & GXBB_WDT_TCNT_SETUP_MASK)) / 1000; + return ((reg & GXBB_WDT_TCNT_SETUP_MASK) - + (reg >> GXBB_WDT_TCNT_CNT_SHIFT)) / 1000; }
static const struct watchdog_ops meson_gxbb_wdt_ops = {