[PATCH 4.4.y-cip 02/23] PM / OPP: Disable OPPs that aren't supported by the regulator


Chen-Yu Tsai (Moxa) <wens@...>
 

From: Viresh Kumar <viresh.kumar@linaro.org>

commit 7d34d56ef3349cd5f29cf7aab6650f3414fa81b9 upstream.

Disable any OPPs where the connected regulator isn't able to provide the
specified voltage.

Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Reviewed-by: Stephen Boyd <sboyd@codeaurora.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: Chen-Yu Tsai (Moxa) <wens@csie.org>
---
drivers/base/power/opp/core.c | 22 ++++++++++++++++++++++
1 file changed, 22 insertions(+)

diff --git a/drivers/base/power/opp/core.c b/drivers/base/power/opp/core.=
c
index efdfcee48cac7..48ec88befffc9 100644
--- a/drivers/base/power/opp/core.c
+++ b/drivers/base/power/opp/core.c
@@ -687,6 +687,22 @@ static struct dev_pm_opp *_allocate_opp(struct devic=
e *dev,
return opp;
}
=20
+static bool _opp_supported_by_regulators(struct dev_pm_opp *opp,
+ struct device_opp *dev_opp)
+{
+ struct regulator *reg =3D dev_opp->regulator;
+
+ if (!IS_ERR(reg) &&
+ !regulator_is_supported_voltage(reg, opp->u_volt_min,
+ opp->u_volt_max)) {
+ pr_warn("%s: OPP minuV: %lu maxuV: %lu, not supported by regulator\n",
+ __func__, opp->u_volt_min, opp->u_volt_max);
+ return false;
+ }
+
+ return true;
+}
+
static int _opp_add(struct device *dev, struct dev_pm_opp *new_opp,
struct device_opp *dev_opp)
{
@@ -728,6 +744,12 @@ static int _opp_add(struct device *dev, struct dev_p=
m_opp *new_opp,
dev_err(dev, "%s: Failed to register opp to debugfs (%d)\n",
__func__, ret);
=20
+ if (!_opp_supported_by_regulators(new_opp, dev_opp)) {
+ new_opp->available =3D false;
+ dev_warn(dev, "%s: OPP not supported by regulators (%lu)\n",
+ __func__, new_opp->rate);
+ }
+
return 0;
}
=20
--=20
2.27.0

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