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regulator: When constraining modes fall back to higher power modes

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If a mode requested by a consumer is not allowed by constraints
automatically fall back to a higher power mode if possible. This
ensures that consumers get at least the output they requested while
allowing machine drivers to transparently limit lower power modes
if required.

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: Liam Girdwood <lrg@slimlogic.co.uk>
This commit is contained in:
Mark Brown 2011-03-30 06:29:12 +09:00 committed by Liam Girdwood
parent dc7acbb251
commit 2c6082341d
1 changed files with 15 additions and 9 deletions
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24
drivers/regulator/core.c
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@ -197,9 +197,9 @@ static int regulator_check_current_limit(struct regulator_dev *rdev,
}
/* operating mode constraint check */
static int regulator_check_mode(struct regulator_dev *rdev, int mode)
static int regulator_mode_constrain(struct regulator_dev *rdev, int *mode)
{
switch (mode) {
switch (*mode) {
case REGULATOR_MODE_FAST:
case REGULATOR_MODE_NORMAL:
case REGULATOR_MODE_IDLE:
@ -217,11 +217,17 @@ static int regulator_check_mode(struct regulator_dev *rdev, int mode)
rdev_err(rdev, "operation not allowed\n");
return -EPERM;
}
if (!(rdev->constraints->valid_modes_mask & mode)) {
rdev_err(rdev, "invalid mode %x\n", mode);
return -EINVAL;
/* The modes are bitmasks, the most power hungry modes having
* the lowest values. If the requested mode isn't supported
* try higher modes. */
while (*mode) {
if (rdev->constraints->valid_modes_mask & *mode)
return 0;
*mode /= 2;
}
return 0;
return -EINVAL;
}
/* dynamic regulator mode switching constraint check */
@ -612,7 +618,7 @@ static void drms_uA_update(struct regulator_dev *rdev)
output_uV, current_uA);
/* check the new mode is allowed */
err = regulator_check_mode(rdev, mode);
err = regulator_mode_constrain(rdev, &mode);
if (err == 0)
rdev->desc->ops->set_mode(rdev, mode);
}
@ -2005,7 +2011,7 @@ int regulator_set_mode(struct regulator *regulator, unsigned int mode)
}
/* constraints check */
ret = regulator_check_mode(rdev, mode);
ret = regulator_mode_constrain(rdev, mode);
if (ret < 0)
goto out;
@ -2116,7 +2122,7 @@ int regulator_set_optimum_mode(struct regulator *regulator, int uA_load)
mode = rdev->desc->ops->get_optimum_mode(rdev,
input_uV, output_uV,
total_uA_load);
ret = regulator_check_mode(rdev, mode);
ret = regulator_mode_constrain(rdev, &mode);
if (ret < 0) {
rdev_err(rdev, "failed to get optimum mode @ %d uA %d -> %d uV\n",
total_uA_load, input_uV, output_uV);