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author | Axel Lin <axel.lin@ingics.com> | 2013-04-17 21:42:23 +0800 |
---|---|---|
committer | Mark Brown <broonie@opensource.wolfsonmicro.com> | 2013-04-23 11:47:37 +0100 |
commit | 58fa6ab42c29156b2808f8db231b2ffd8fa25502 (patch) | |
tree | a8e34ac587ff6024813f8a6996627c133b9089c4 /drivers | |
parent | 41ef2d5678d83af030125550329b6ae8b74618fa (diff) | |
download | op-kernel-dev-58fa6ab42c29156b2808f8db231b2ffd8fa25502.zip op-kernel-dev-58fa6ab42c29156b2808f8db231b2ffd8fa25502.tar.gz |
regulator: tps80031: Fix LDO2 track mode for TPS80031 or TPS80032-ES1.0
Currently we have a special code in tps80031_ldo_set_voltage_sel() to handle
LDO2 track mode for TPS80031 or TPS80032-ES1.0. The purpose is to address below
issues:
Issue description:
- LDO2 traking mode is enabled
- LDO2 tracks SMPS2 voltage.
- LDO2 automatically switch-off when LDO2_CFG_VOLTAGE is changed to some discrete values (non exhaustive list):
00011001, 00011010, 00011011, 00011100, .
- LDO2 switch-on again when LDO2_CFG_VOLTAGE is changed to other values (non exhaustive list):
00011000, 00010111, .
LDOs have reserved codes. For these codes, LDO is switch-off.
In tracking, LDO2 ref comes from SMPS2.
However LDO2 enable is still gated by LDO2 VSEL decoding.
As a result, in tracking mode LDO2 will be disabled for following code (SMPS VSEL format):
000000 & 100000 (MSB not decoded)
011001 & 111001 (MSB not decoded)
011010 & 111010 (MSB not decoded)
011100 & 111100 (MSB not decoded)
011101 & 111101 (MSB not decoded)
011110 & 111110 (MSB not decoded)
However, current code has below bugs:
1. It uses regulator_list_voltage_linear, so list_voltage() still shows above
invalid selectors have supported voltage.
2. Current code may return -EINVAL in tps80031_ldo_set_voltage_sel() for
supported voltage. This is because when we use regulator_list_voltage_linear
as list_voltage callback, regulator core will default use
regulator_map_voltage_linear(). regulator_map_voltage_linear() has an
assumption that the voltages are linear which is not true for this case.
For example,
when request voltage range is: min_uV=950000 uV && max_uV=1200000 uV
regulator_map_voltage_linear() returns the selector is 29 (0x1D),
set_voltage_sel() returns -EINVAL.
(The selector is in invalid range, 0x19 ~ 0x1f).
In above case, map_voltage() should find the lowest valid voltage within
specific range (selector = 0x20) and set_voltage_sel() should successfully
set the voltage to 987500 uV.
This patch fixes these issues by:
1. Add checking valid setting for LDO2 track mode of TPS80031 or TPS80032-ES1.0
in list_voltage. So it returns -EINVAL for invalid selectors.
2. Implement tps80031_ldo_map_voltage, use regulator_map_voltage_iterate()
to find the lowest voltage within specific range for TPS80031 or
TPS80032-ES1.0. This is required when the voltage map is no longer linear.
Signed-off-by: Axel Lin <axel.lin@ingics.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Diffstat (limited to 'drivers')
-rw-r--r-- | drivers/regulator/tps80031-regulator.c | 38 |
1 files changed, 34 insertions, 4 deletions
diff --git a/drivers/regulator/tps80031-regulator.c b/drivers/regulator/tps80031-regulator.c index 9019d0e..6430789 100644 --- a/drivers/regulator/tps80031-regulator.c +++ b/drivers/regulator/tps80031-regulator.c @@ -238,12 +238,11 @@ static int tps80031_dcdc_get_voltage_sel(struct regulator_dev *rdev) return vsel & SMPS_VSEL_MASK; } -static int tps80031_ldo_set_voltage_sel(struct regulator_dev *rdev, - unsigned sel) +static int tps80031_ldo_list_voltage(struct regulator_dev *rdev, + unsigned int sel) { struct tps80031_regulator *ri = rdev_get_drvdata(rdev); struct device *parent = to_tps80031_dev(rdev); - int ret; /* Check for valid setting for TPS80031 or TPS80032-ES1.0 */ if ((ri->rinfo->desc.id == TPS80031_REGULATOR_LDO2) && @@ -260,6 +259,36 @@ static int tps80031_ldo_set_voltage_sel(struct regulator_dev *rdev, } } + return regulator_list_voltage_linear(rdev, sel); +} + +static int tps80031_ldo_map_voltage(struct regulator_dev *rdev, + int min_uV, int max_uV) +{ + struct tps80031_regulator *ri = rdev_get_drvdata(rdev); + struct device *parent = to_tps80031_dev(rdev); + + /* Check for valid setting for TPS80031 or TPS80032-ES1.0 */ + if ((ri->rinfo->desc.id == TPS80031_REGULATOR_LDO2) && + (ri->device_flags & TRACK_MODE_ENABLE)) { + if (((tps80031_get_chip_info(parent) == TPS80031) || + ((tps80031_get_chip_info(parent) == TPS80032) && + (tps80031_get_pmu_version(parent) == 0x0)))) { + return regulator_map_voltage_iterate(rdev, min_uV, + max_uV); + } + } + + return regulator_map_voltage_linear(rdev, min_uV, max_uV); +} + +static int tps80031_ldo_set_voltage_sel(struct regulator_dev *rdev, + unsigned sel) +{ + struct tps80031_regulator *ri = rdev_get_drvdata(rdev); + struct device *parent = to_tps80031_dev(rdev); + int ret; + ret = tps80031_write(parent, ri->rinfo->volt_id, ri->rinfo->volt_reg, sel); if (ret < 0) @@ -390,7 +419,8 @@ static struct regulator_ops tps80031_dcdc_ops = { }; static struct regulator_ops tps80031_ldo_ops = { - .list_voltage = regulator_list_voltage_linear, + .list_voltage = tps80031_ldo_list_voltage, + .map_voltage = tps80031_ldo_map_voltage, .set_voltage_sel = tps80031_ldo_set_voltage_sel, .get_voltage_sel = tps80031_ldo_get_voltage_sel, .enable = tps80031_reg_enable, |