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regulator: ltc3676: Assure PGOOD mask is set before changing voltage 

Make sure the DVBxB bit 5, PGOOD mask, is set before changing voltage
on the buck converters. If the PGOOD mask bit is not set, the PMIC may
deassert the PGOOD signal during the voltage transition.

On systems that use the PGOOD signal as a power OK indication for the
board or SoC, which should be the case on correct designs, deasserting
the PGOOD signal will lead to system reset or shutdown, which is not
the expected behavior when changing PMIC buck converter voltage.

Signed-off-by: Marek Vasut <marex@denx.de>
Signed-off-by: Mark Brown <broonie@kernel.org>
hifive-unleashed-5.1
Marek Vasut 2018-05-01 03:50:45 +02:00 committed by Mark Brown
parent e241e3f2bf
commit d2a66ddfe8
No known key found for this signature in database
GPG Key ID: 24D68B725D5487D0
1 changed files with 19 additions and 1 deletions
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20
drivers/regulator/ltc3676.c
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@ -52,6 +52,7 @@
#define LTC3676_CLIRQ 0x1F
#define LTC3676_DVBxA_REF_SELECT BIT(5)
#define LTC3676_DVBxB_PGOOD_MASK BIT(5)
#define LTC3676_IRQSTAT_PGOOD_TIMEOUT BIT(3)
#define LTC3676_IRQSTAT_UNDERVOLT_WARN BIT(4)
@ -123,6 +124,23 @@ static int ltc3676_set_suspend_mode(struct regulator_dev *rdev,
mask, val);
}
static int ltc3676_set_voltage_sel(struct regulator_dev *rdev, unsigned selector)
{
struct ltc3676 *ltc3676 = rdev_get_drvdata(rdev);
struct device *dev = ltc3676->dev;
int ret, dcdc = rdev_get_id(rdev);
dev_dbg(dev, "%s id=%d selector=%d\n", __func__, dcdc, selector);
ret = regmap_update_bits(ltc3676->regmap, rdev->desc->vsel_reg + 1,
LTC3676_DVBxB_PGOOD_MASK,
LTC3676_DVBxB_PGOOD_MASK);
if (ret)
return ret;
return regulator_set_voltage_sel_regmap(rdev, selector);
}
static inline unsigned int ltc3676_scale(unsigned int uV, u32 r1, u32 r2)
{
uint64_t tmp;
@ -166,7 +184,7 @@ static const struct regulator_ops ltc3676_linear_regulator_ops = {
.disable = regulator_disable_regmap,
.is_enabled = regulator_is_enabled_regmap,
.list_voltage = regulator_list_voltage_linear,
.set_voltage_sel = regulator_set_voltage_sel_regmap,
.set_voltage_sel = ltc3676_set_voltage_sel,
.get_voltage_sel = regulator_get_voltage_sel_regmap,
.set_suspend_voltage = ltc3676_set_suspend_voltage,
.set_suspend_mode = ltc3676_set_suspend_mode,