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regulator: max8997: Use uV in voltage_map_desc 

Current code does integer division (min_vol = min_uV / 1000) before pass
min_vol to max8997_get_voltage_proper_val().
So it is possible min_vol is truncated to a smaller value.

For example, if the request min_uV is 800900 for ldo.
min_vol = 800900 / 1000 = 800 (mV)
Then max8997_get_voltage_proper_val returns 800 mV for this case which is lower
than the requested voltage.

Use uV rather than mV in voltage_map_desc to prevent truncation by integer
division.

Signed-off-by: Axel Lin <axel.lin@ingics.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Cc: stable@vger.kernel.org
This commit is contained in:
Axel Lin 2012-12-28 17:09:03 +08:00 committed by Mark Brown
parent d1c3ed669a
commit bc3b7756b5
1 changed files with 17 additions and 19 deletions
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36
drivers/regulator/max8997.c
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@ -71,26 +71,26 @@ struct voltage_map_desc {
int step;
};
/* Voltage maps in mV */
/* Voltage maps in uV */
static const struct voltage_map_desc ldo_voltage_map_desc = {
.min = 800, .max = 3950, .step = 50,
.min = 800000, .max = 3950000, .step = 50000,
}; /* LDO1 ~ 18, 21 all */
static const struct voltage_map_desc buck1245_voltage_map_desc = {
.min = 650, .max = 2225, .step = 25,
.min = 650000, .max = 2225000, .step = 25000,
}; /* Buck1, 2, 4, 5 */
static const struct voltage_map_desc buck37_voltage_map_desc = {
.min = 750, .max = 3900, .step = 50,
.min = 750000, .max = 3900000, .step = 50000,
}; /* Buck3, 7 */
/* current map in mA */
/* current map in uA */
static const struct voltage_map_desc charger_current_map_desc = {
.min = 200, .max = 950, .step = 50,
.min = 200000, .max = 950000, .step = 50000,
};
static const struct voltage_map_desc topoff_current_map_desc = {
.min = 50, .max = 200, .step = 10,
.min = 50000, .max = 200000, .step = 10000,
};
static const struct voltage_map_desc *reg_voltage_map[] = {
@ -194,7 +194,7 @@ static int max8997_list_voltage(struct regulator_dev *rdev,
if (val > desc->max)
return -EINVAL;
return val * 1000;
return val;
}
static int max8997_get_enable_register(struct regulator_dev *rdev,
@ -485,7 +485,6 @@ static int max8997_set_voltage_ldobuck(struct regulator_dev *rdev,
{
struct max8997_data *max8997 = rdev_get_drvdata(rdev);
struct i2c_client *i2c = max8997->iodev->i2c;
int min_vol = min_uV / 1000, max_vol = max_uV / 1000;
const struct voltage_map_desc *desc;
int rid = rdev_get_id(rdev);
int i, reg, shift, mask, ret;
@ -509,7 +508,7 @@ static int max8997_set_voltage_ldobuck(struct regulator_dev *rdev,
desc = reg_voltage_map[rid];
i = max8997_get_voltage_proper_val(desc, min_vol, max_vol);
i = max8997_get_voltage_proper_val(desc, min_uV, max_uV);
if (i < 0)
return i;
@ -557,7 +556,7 @@ static int max8997_set_voltage_ldobuck_time_sel(struct regulator_dev *rdev,
case MAX8997_BUCK4:
case MAX8997_BUCK5:
return DIV_ROUND_UP(desc->step * (new_selector - old_selector),
max8997->ramp_delay);
max8997->ramp_delay * 1000);
}
return 0;
@ -656,7 +655,6 @@ static int max8997_set_voltage_buck(struct regulator_dev *rdev,
const struct voltage_map_desc *desc;
int new_val, new_idx, damage, tmp_val, tmp_idx, tmp_dmg;
bool gpio_dvs_mode = false;
int min_vol = min_uV / 1000, max_vol = max_uV / 1000;
if (rid < MAX8997_BUCK1 || rid > MAX8997_BUCK7)
return -EINVAL;
@ -681,7 +679,7 @@ static int max8997_set_voltage_buck(struct regulator_dev *rdev,
selector);
desc = reg_voltage_map[rid];
new_val = max8997_get_voltage_proper_val(desc, min_vol, max_vol);
new_val = max8997_get_voltage_proper_val(desc, min_uV, max_uV);
if (new_val < 0)
return new_val;
@ -1123,8 +1121,8 @@ static int max8997_pmic_probe(struct platform_device *pdev)
max8997->buck1_vol[i] = ret =
max8997_get_voltage_proper_val(
&buck1245_voltage_map_desc,
pdata->buck1_voltage[i] / 1000,
pdata->buck1_voltage[i] / 1000 +
pdata->buck1_voltage[i],
pdata->buck1_voltage[i] +
buck1245_voltage_map_desc.step);
if (ret < 0)
goto err_out;
@ -1132,8 +1130,8 @@ static int max8997_pmic_probe(struct platform_device *pdev)
max8997->buck2_vol[i] = ret =
max8997_get_voltage_proper_val(
&buck1245_voltage_map_desc,
pdata->buck2_voltage[i] / 1000,
pdata->buck2_voltage[i] / 1000 +
pdata->buck2_voltage[i],
pdata->buck2_voltage[i] +
buck1245_voltage_map_desc.step);
if (ret < 0)
goto err_out;
@ -1141,8 +1139,8 @@ static int max8997_pmic_probe(struct platform_device *pdev)
max8997->buck5_vol[i] = ret =
max8997_get_voltage_proper_val(
&buck1245_voltage_map_desc,
pdata->buck5_voltage[i] / 1000,
pdata->buck5_voltage[i] / 1000 +
pdata->buck5_voltage[i],
pdata->buck5_voltage[i] +
buck1245_voltage_map_desc.step);
if (ret < 0)
goto err_out;