Messages in this thread Patch in this message | | | From | Baolin Wang <> | Subject | [PATCH 1/3] power: reset: sc27xx: Power off the external subsystems' connection | Date | Mon, 9 Mar 2020 16:18:44 +0800 |
| |
From: Sherry Zong <sherry.zong@unisoc.com>
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 <sherry.zong@unisoc.com> Signed-off-by: Baolin Wang <baolin.wang7@gmail.com> --- 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 29fb08b..2bedd4c 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 void sc27xx_poweroff_shutdown(void) 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); } -- 1.9.1
| |