Support set_opp() customization without requiring to use regulators. This
is needed by drivers which want to use dev_pm_opp_set_rate() for changing
rates of a multiple clocks and don't need to touch regulator.
One example is NVIDIA Tegra30/114 SoCs which have two sibling 3D hardware
units which should be use to the same clock rate, meanwhile voltage
scaling is done using a power domain. In this case OPP table doesn't have
a regulator, causing a NULL dereference in _set_opp_custom().
Signed-off-by: Dmitry Osipenko <digetx@xxxxxxxxx>
---
drivers/opp/core.c | 16 ++++++++++++----
1 file changed, 12 insertions(+), 4 deletions(-)
diff --git a/drivers/opp/core.c b/drivers/opp/core.c
index 3d02fe33630b..625dae7a5ecb 100644
--- a/drivers/opp/core.c
+++ b/drivers/opp/core.c
@@ -828,17 +828,25 @@ static int _set_opp_custom(const struct opp_table *opp_table,
struct dev_pm_opp_supply *old_supply,
struct dev_pm_opp_supply *new_supply)
{
- struct dev_pm_set_opp_data *data;
+ struct dev_pm_set_opp_data *data, tmp_data;
+ unsigned int regulator_count;
int size;
- data = opp_table->set_opp_data;
+ if (opp_table->set_opp_data) {
+ data = opp_table->set_opp_data;
+ regulator_count = opp_table->regulator_count;
+ } else {
+ data = &tmp_data;
+ regulator_count = 0;
+ }
+
data->regulators = opp_table->regulators;
- data->regulator_count = opp_table->regulator_count;
+ data->regulator_count = regulator_count;
data->clk = opp_table->clk;
data->dev = dev;
data->old_opp.rate = old_freq;
- size = sizeof(*old_supply) * opp_table->regulator_count;
+ size = sizeof(*old_supply) * regulator_count;
if (!old_supply)
memset(data->old_opp.supplies, 0, size);
else
--
2.29.2
