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twl-regulator: Add turnon delay to reg_enable 

This change implements a basic turnon delay in the regulator enable function
to make it less probable that reg_enable returns before the regulator
output is at target level

Signed-off-by: Juha Keski-Saari <ext-juha.1.keski-saari@nokia.com>
Acked-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: Liam Girdwood <lrg@slimlogic.co.uk>
This commit is contained in:
Juha Keski-Saari 2009-12-16 14:55:26 +02:00 committed by Liam Girdwood
parent 30010fa52c
commit 53b8a9d92a
1 changed files with 7 additions and 1 deletions
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8
drivers/regulator/twl-regulator.c
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@ -12,6 +12,7 @@
#include <linux/module.h> #include <linux/module.h>
#include <linux/init.h> #include <linux/init.h>
#include <linux/err.h> #include <linux/err.h>
#include <linux/delay.h>
#include <linux/platform_device.h> #include <linux/platform_device.h>
#include <linux/regulator/driver.h> #include <linux/regulator/driver.h>
#include <linux/regulator/machine.h> #include <linux/regulator/machine.h>
@ -134,6 +135,7 @@ static int twlreg_enable(struct regulator_dev *rdev)
{ {
struct twlreg_info *info = rdev_get_drvdata(rdev); struct twlreg_info *info = rdev_get_drvdata(rdev);
int grp; int grp;
int ret;
grp = twlreg_read(info, TWL_MODULE_PM_RECEIVER, VREG_GRP); grp = twlreg_read(info, TWL_MODULE_PM_RECEIVER, VREG_GRP);
if (grp < 0) if (grp < 0)
@ -144,7 +146,11 @@ static int twlreg_enable(struct regulator_dev *rdev)
else else
grp |= P1_GRP_6030; grp |= P1_GRP_6030;
return twlreg_write(info, TWL_MODULE_PM_RECEIVER, VREG_GRP, grp); ret = twlreg_write(info, TWL_MODULE_PM_RECEIVER, VREG_GRP, grp);
udelay(info->delay);
return ret;
} }
static int twlreg_disable(struct regulator_dev *rdev) static int twlreg_disable(struct regulator_dev *rdev)