From 85254bcf394f93a8955814da1eef4d477b63eb84 Mon Sep 17 00:00:00 2001 From: Dmitry Osipenko Date: Fri, 5 Oct 2018 18:36:35 +0300 Subject: [PATCH] regulator: core: Add new max_uV_step constraint On NVIDIA Tegra30 there is a requirement for regulator "A" to have voltage higher than voltage of regulator "B" by N microvolts, the N value changes depending on the voltage of regulator "B". This is similar to min-spread between voltages of regulators, the difference is that the spread value isn't fixed. This means that extra carefulness is required for regulator "A" to drop its voltage without violating the requirement, hence its voltage should be changed in steps so that its couple "B" could follow (there is also max-spread requirement). Add new "max_uV_step" constraint that breaks voltage change into several steps, each step is limited by the max_uV_step value. Signed-off-by: Dmitry Osipenko Signed-off-by: Mark Brown --- drivers/regulator/core.c | 41 +++++++++++++++++++++++++++++++ drivers/regulator/of_regulator.c | 4 +++ include/linux/regulator/machine.h | 3 +++ 3 files changed, 48 insertions(+) diff --git a/drivers/regulator/core.c b/drivers/regulator/core.c index 089e8ad8ef57..ba03bdf3716f 100644 --- a/drivers/regulator/core.c +++ b/drivers/regulator/core.c @@ -3191,6 +3191,36 @@ out: return ret; } +static int regulator_limit_voltage_step(struct regulator_dev *rdev, + int *current_uV, int *min_uV) +{ + struct regulation_constraints *constraints = rdev->constraints; + + /* Limit voltage change only if necessary */ + if (!constraints->max_uV_step || !_regulator_is_enabled(rdev)) + return 1; + + if (*current_uV < 0) { + *current_uV = _regulator_get_voltage(rdev); + + if (*current_uV < 0) + return *current_uV; + } + + if (abs(*current_uV - *min_uV) <= constraints->max_uV_step) + return 1; + + /* Clamp target voltage within the given step */ + if (*current_uV < *min_uV) + *min_uV = min(*current_uV + constraints->max_uV_step, + *min_uV); + else + *min_uV = max(*current_uV - constraints->max_uV_step, + *min_uV); + + return 0; +} + static int regulator_get_optimal_voltage(struct regulator_dev *rdev, int *current_uV, int *min_uV, int *max_uV, @@ -3302,6 +3332,17 @@ static int regulator_get_optimal_voltage(struct regulator_dev *rdev, desired_min_uV = possible_uV; finish: + /* Apply max_uV_step constraint if necessary */ + if (state == PM_SUSPEND_ON) { + ret = regulator_limit_voltage_step(rdev, current_uV, + &desired_min_uV); + if (ret < 0) + return ret; + + if (ret == 0) + done = false; + } + /* Set current_uV if wasn't done earlier in the code and if necessary */ if (n_coupled > 1 && *current_uV == -1) { diff --git a/drivers/regulator/of_regulator.c b/drivers/regulator/of_regulator.c index c4223b3e0dff..a732f09d207b 100644 --- a/drivers/regulator/of_regulator.c +++ b/drivers/regulator/of_regulator.c @@ -170,6 +170,10 @@ static void of_get_regulation_constraints(struct device_node *np, &pval)) constraints->max_spread = pval; + if (!of_property_read_u32(np, "regulator-max-step-microvolt", + &pval)) + constraints->max_uV_step = pval; + constraints->over_current_protection = of_property_read_bool(np, "regulator-over-current-protection"); diff --git a/include/linux/regulator/machine.h b/include/linux/regulator/machine.h index a459a5e973a7..1d34a70ffda2 100644 --- a/include/linux/regulator/machine.h +++ b/include/linux/regulator/machine.h @@ -158,6 +158,9 @@ struct regulation_constraints { /* used for coupled regulators */ int max_spread; + /* used for changing voltage in steps */ + int max_uV_step; + /* valid regulator operating modes for this machine */ unsigned int valid_modes_mask; -- 2.30.2