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power: regulator: rk8xx: Add 500us delay after LDO regulator is enabled

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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: 94afc1cb46 ("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>
This commit is contained in:
Jonas Karlman 2023-07-02 12:41:15 +00:00 committed by Kever Yang
parent b8fc65473a
commit fea7a29cc8
1 changed files with 4 additions and 0 deletions
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4
drivers/power/regulator/rk8xx.c
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@ -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 @@ static int _ldo_set_enable(struct udevice *pmic, int ldo, bool enable)
break;
}
if (enable)
udelay(500);
return ret;
}