From 179dc63d06c51a78483dedbdf34540af053a6269 Mon Sep 17 00:00:00 2001 From: Hans de Goede Date: Sun, 5 Jun 2016 15:50:48 +0200 Subject: mfd: axp20x: Add a 500ms delay at the end of axp20x_power_off The kernel expects the power_off function to not return, and if it does it panics. Add a slight delay after the i2c write which turns off power through the PMIC, to give capacitors etc. some time to drain. Without this the kernel lives on long enough after the poweroff to print the following on the serial console on my Mele A1000G quad: [ 248.583588] reboot: Power down [ 248.600490] Kernel pa With the delay the start of printing "Kernel panic" is gone. Signed-off-by: Hans de Goede Acked-by: Chen-Yu Tsai Signed-off-by: Lee Jones --- drivers/mfd/axp20x.c | 4 ++++ 1 file changed, 4 insertions(+) (limited to 'drivers/mfd') diff --git a/drivers/mfd/axp20x.c b/drivers/mfd/axp20x.c index ca04361a0ecd..a1ed43ea95aa 100644 --- a/drivers/mfd/axp20x.c +++ b/drivers/mfd/axp20x.c @@ -17,6 +17,7 @@ */ #include +#include #include #include #include @@ -667,6 +668,9 @@ static void axp20x_power_off(void) regmap_write(axp20x_pm_power_off->regmap, AXP20X_OFF_CTRL, AXP20X_OFF); + + /* Give capacitors etc. time to drain to avoid kernel panic msg. */ + msleep(500); } int axp20x_match_device(struct axp20x_dev *axp20x) -- cgit v1.2.3