From: Sherry Zong <[email protected]>
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 <[email protected]>
Signed-off-by: Baolin Wang <[email protected]>
---
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