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authorLaxman Dewangan <ldewangan@nvidia.com>2013-04-18 17:02:48 +0400
committerMark Brown <broonie@opensource.wolfsonmicro.com>2013-04-18 21:23:53 +0400
commit51d3a0c999e18a802a654171b5e05952b4630148 (patch)
tree4ddc1594d7f4d132d40b6e3adf62892ba01eb2cc /drivers/regulator/palmas-regulator.c
parent28d1e8cd671a53d6b4f967abbbc2a55f7bd333f6 (diff)
downloadlinux-51d3a0c999e18a802a654171b5e05952b4630148.tar.xz
regulator: palmas: preserve modes of rails during enable/disable
The Palma device like TPS65913 have the mode mask which is also used for enable/disable the rails. The mode bits are defined as 00: OFF 01: AUTO 10: ECO 11: Forced PWM and modes are set accordingly as REGULATOR_MODE_NORMAL: AUTO REGULATOR_MODE_IDLE: ECO REGULATOR_MODE_FAST: PWM Two issue observed: 1. If client calls following sequence: regulator_enable(), regulator_set_mode(FAST), regulator_disable() and again the regulator_enable() then the mode is reset to NORMAL inplace of keeping the mode as FAST. Fixing this by storing the current mode configured by client and restoring modes when enable() is called after disable(). 2. In following sequence, the regulator get enabled: regulator_disable() regulator_set_mode(FAST), Fixing this by updating new mode in register only if it is enabled. Signed-off-by: Laxman Dewangan <ldewangan@nvidia.com> Acked-by: Graeme Gregory <gg@slimlogic.co.uk> Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Diffstat (limited to 'drivers/regulator/palmas-regulator.c')
-rw-r--r--drivers/regulator/palmas-regulator.c30
1 files changed, 23 insertions, 7 deletions
diff --git a/drivers/regulator/palmas-regulator.c b/drivers/regulator/palmas-regulator.c
index 33369160b770..38447ac53cb8 100644
--- a/drivers/regulator/palmas-regulator.c
+++ b/drivers/regulator/palmas-regulator.c
@@ -274,7 +274,10 @@ static int palmas_enable_smps(struct regulator_dev *dev)
palmas_smps_read(pmic->palmas, palmas_regs_info[id].ctrl_addr, &reg);
reg &= ~PALMAS_SMPS12_CTRL_MODE_ACTIVE_MASK;
- reg |= SMPS_CTRL_MODE_ON;
+ if (pmic->current_reg_mode[id])
+ reg |= pmic->current_reg_mode[id];
+ else
+ reg |= SMPS_CTRL_MODE_ON;
palmas_smps_write(pmic->palmas, palmas_regs_info[id].ctrl_addr, reg);
@@ -296,16 +299,19 @@ static int palmas_disable_smps(struct regulator_dev *dev)
return 0;
}
-
static int palmas_set_mode_smps(struct regulator_dev *dev, unsigned int mode)
{
struct palmas_pmic *pmic = rdev_get_drvdata(dev);
int id = rdev_get_id(dev);
unsigned int reg;
+ bool rail_enable = true;
palmas_smps_read(pmic->palmas, palmas_regs_info[id].ctrl_addr, &reg);
reg &= ~PALMAS_SMPS12_CTRL_MODE_ACTIVE_MASK;
+ if (reg == SMPS_CTRL_MODE_OFF)
+ rail_enable = false;
+
switch (mode) {
case REGULATOR_MODE_NORMAL:
reg |= SMPS_CTRL_MODE_ON;
@@ -319,8 +325,11 @@ static int palmas_set_mode_smps(struct regulator_dev *dev, unsigned int mode)
default:
return -EINVAL;
}
- palmas_smps_write(pmic->palmas, palmas_regs_info[id].ctrl_addr, reg);
+ pmic->current_reg_mode[id] = reg & PALMAS_SMPS12_CTRL_MODE_ACTIVE_MASK;
+ if (rail_enable)
+ palmas_smps_write(pmic->palmas,
+ palmas_regs_info[id].ctrl_addr, reg);
return 0;
}
@@ -330,9 +339,7 @@ static unsigned int palmas_get_mode_smps(struct regulator_dev *dev)
int id = rdev_get_id(dev);
unsigned int reg;
- palmas_smps_read(pmic->palmas, palmas_regs_info[id].ctrl_addr, &reg);
- reg &= PALMAS_SMPS12_CTRL_STATUS_MASK;
- reg >>= PALMAS_SMPS12_CTRL_STATUS_SHIFT;
+ reg = pmic->current_reg_mode[id] & PALMAS_SMPS12_CTRL_MODE_ACTIVE_MASK;
switch (reg) {
case SMPS_CTRL_MODE_ON:
@@ -871,7 +878,8 @@ static int palmas_regulators_probe(struct platform_device *pdev)
/*
* Read and store the RANGE bit for later use
* This must be done before regulator is probed,
- * otherwise we error in probe with unsupportable ranges.
+ * otherwise we error in probe with unsupportable
+ * ranges. Read the current smps mode for later use.
*/
addr = palmas_regs_info[id].vsel_addr;
@@ -888,6 +896,14 @@ static int palmas_regulators_probe(struct platform_device *pdev)
palmas_regs_info[id].vsel_addr);
pmic->desc[id].vsel_mask =
PALMAS_SMPS12_VOLTAGE_VSEL_MASK;
+
+ /* Read the smps mode for later use. */
+ addr = palmas_regs_info[id].ctrl_addr;
+ ret = palmas_smps_read(pmic->palmas, addr, &reg);
+ if (ret)
+ goto err_unregister_regulator;
+ pmic->current_reg_mode[id] = reg &
+ PALMAS_SMPS12_CTRL_MODE_ACTIVE_MASK;
}
pmic->desc[id].type = REGULATOR_VOLTAGE;