From: Jonas Karlman <jonas@kwiboo.se> Date: Sun, 2 Jul 2023 12:41:15 +0000 (+0000) Subject: power: regulator: rk8xx: Add 500us delay after LDO regulator is enabled X-Git-Tag: v2025.01-rc5-pxa1908~909^2~8 X-Git-Url: http://git.dujemihanovic.xyz/%22http:/www.sics.se/static/html/%7B%7B%20%28.OutputFormats.Get?a=commitdiff_plain;h=fea7a29cc8d86a0bbcb4bcf740d47924839b1f81;p=u-boot.git 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 0ee07ad299..e95640a39b 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 @@ static int _ldo_set_enable(struct udevice *pmic, int ldo, bool enable) break; } + if (enable) + udelay(500); + return ret; }