power: regulator: rk8xx: Add 500us delay after LDO regulator is enabled
A quick power cycle of a LDO regulator during dw-mmc signal voltage
change has shown that SD-card does not always get recognized.
Linux driver use an enable_time of 400us for LDO regulators. Apply a
500us delay when a LDO regulator is enabled to fix possible issues.
Fixes: 94afc1cb466a ("power: regulator: rk8xx: update the driver for rk808 and rk818")
Signed-off-by: Jonas Karlman <jonas@kwiboo.se>
Reviewed-by: elaine.zhang<elaine.zhang@rock-chips.com>
Reviewed-by: Kever Yang <kever.yang@rock-chips.com>
diff --git a/drivers/power/regulator/rk8xx.c b/drivers/power/regulator/rk8xx.c
index 0ee07ad..e95640a 100644
--- a/drivers/power/regulator/rk8xx.c
+++ b/drivers/power/regulator/rk8xx.c
@@ -12,6 +12,7 @@
#include <dm.h>
#include <errno.h>
#include <log.h>
+#include <linux/delay.h>
#include <power/rk8xx_pmic.h>
#include <power/pmic.h>
#include <power/regulator.h>
@@ -616,6 +617,9 @@
break;
}
+ if (enable)
+ udelay(500);
+
return ret;
}