From 6cdd5b09cbe67365c42aee539f6fd00f2ecfdaab Mon Sep 17 00:00:00 2001 From: Sherry Zong Date: Mon, 9 Mar 2020 16:18:44 +0800 Subject: [PATCH] power: reset: sc27xx: Power off the external subsystems' connection When powering off the whole system, we should power off some external subsystems' connection firstly, otherwise some external subsystems will hold some power and result in powering down abnormally. Signed-off-by: Sherry Zong Signed-off-by: Baolin Wang Signed-off-by: Sebastian Reichel --- drivers/power/reset/sc27xx-poweroff.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/drivers/power/reset/sc27xx-poweroff.c b/drivers/power/reset/sc27xx-poweroff.c index 29fb08b8faa0..2bedd4c58ddc 100644 --- a/drivers/power/reset/sc27xx-poweroff.c +++ b/drivers/power/reset/sc27xx-poweroff.c @@ -13,6 +13,8 @@ #define SC27XX_PWR_PD_HW 0xc2c #define SC27XX_PWR_OFF_EN BIT(0) +#define SC27XX_SLP_CTRL 0xdf0 +#define SC27XX_LDO_XTL_EN BIT(3) static struct regmap *regmap; @@ -40,6 +42,9 @@ static struct syscore_ops poweroff_syscore_ops = { static void sc27xx_poweroff_do_poweroff(void) { + /* Disable the external subsys connection's power firstly */ + regmap_write(regmap, SC27XX_SLP_CTRL, SC27XX_LDO_XTL_EN); + regmap_write(regmap, SC27XX_PWR_PD_HW, SC27XX_PWR_OFF_EN); } -- 2.20.1