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opp: core: add regulators enable and disable 

Add enable regulators to dev_pm_opp_set_regulators() and disable
regulators to dev_pm_opp_put_regulators(). Even if bootloader
leaves regulators enabled, they should be enabled in kernel in
order to increase the reference count.

Tested-by: Marek Szyprowski <m.szyprowski@samsung.com>
Acked-by: Clément Péron <peron.clem@gmail.com>
Tested-by: Clément Péron <peron.clem@gmail.com>
Signed-off-by: Kamil Konieczny <k.konieczny@samsung.com>
[ Viresh: Enable the regulator only after it is programmed and add a
	  flag to track its status. ]
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
This commit is contained in:
Kamil Konieczny 2019-07-19 17:05:32 +02:00 committed by Viresh Kumar
parent b23dfa3543
commit 8d45719caa
2 changed files with 28 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

28
drivers/opp/core.c
View File

@ -664,7 +664,7 @@ static inline int _generic_set_opp_clk_only(struct device *dev, struct clk *clk,
return ret;
}
static int _generic_set_opp_regulator(const struct opp_table *opp_table,
static int _generic_set_opp_regulator(struct opp_table *opp_table,
struct device *dev,
unsigned long old_freq,
unsigned long freq,
@ -699,6 +699,18 @@ static int _generic_set_opp_regulator(const struct opp_table *opp_table,
goto restore_freq;
}
/*
* Enable the regulator after setting its voltages, otherwise it breaks
* some boot-enabled regulators.
*/
if (unlikely(!opp_table->regulator_enabled)) {
ret = regulator_enable(reg);
if (ret < 0)
dev_warn(dev, "Failed to enable regulator: %d", ret);
else
opp_table->regulator_enabled = true;
}
return 0;
restore_freq:
@ -825,12 +837,17 @@ int dev_pm_opp_set_rate(struct device *dev, unsigned long target_freq)
if (!_get_opp_count(opp_table))
return 0;
if (!opp_table->required_opp_tables) {
if (!opp_table->required_opp_tables && !opp_table->regulators) {
dev_err(dev, "target frequency can't be 0\n");
ret = -EINVAL;
goto put_opp_table;
}
if (opp_table->regulator_enabled) {
regulator_disable(opp_table->regulators[0]);
opp_table->regulator_enabled = false;
}
ret = _set_required_opps(dev, opp_table, NULL);
goto put_opp_table;
}
@ -1718,6 +1735,13 @@ void dev_pm_opp_put_regulators(struct opp_table *opp_table)
/* Make sure there are no concurrent readers while updating opp_table */
WARN_ON(!list_empty(&opp_table->opp_list));
if (opp_table->regulator_enabled) {
for (i = opp_table->regulator_count - 1; i >= 0; i--)
regulator_disable(opp_table->regulators[i]);
opp_table->regulator_enabled = false;
}
for (i = opp_table->regulator_count - 1; i >= 0; i--)
regulator_put(opp_table->regulators[i]);

2
drivers/opp/opp.h
View File

@ -147,6 +147,7 @@ enum opp_table_access {
* @clk: Device's clock handle
* @regulators: Supply regulators
* @regulator_count: Number of power supply regulators. Its value can be -1
* @regulator_enabled: Set to true if regulators were previously enabled.
* (uninitialized), 0 (no opp-microvolt property) or > 0 (has opp-microvolt
* property).
* @paths: Interconnect path handles
@ -194,6 +195,7 @@ struct opp_table {
struct clk *clk;
struct regulator **regulators;
int regulator_count;
bool regulator_enabled;
struct icc_path **paths;
unsigned int path_count;
bool genpd_performance_state;