opp: ti-opp-supply: Dynamically update u_volt_min

Keerthyj · vireshk · commit ba038546ff9e · 2018-11-13T09:39:54.000+05:30
The voltage range (min, max) provided in the device tree is from the data manual and is pretty big, catering to a wide range of devices. On a i2c read/write failure the regulator_set_voltage_triplet function falls back to set voltage between min and max. The min value from Device Tree can be lesser than the optimal value and in that case that can lead to a hang or crash. Hence set the u_volt_min dynamically to the optimal voltage value. Cc: 4.16+ <stable@vger.kernel.org> # v4.16+ Fixes: 9a835fa ("PM / OPP: Add ti-opp-supply driver") Signed-off-by: Keerthy <j-keerthy@ti.com> Acked-by: Dave Gerlach <d-gerlach@ti.com> Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
diff --git a/drivers/opp/ti-opp-supply.c b/drivers/opp/ti-opp-supply.c
@@ -290,6 +290,9 @@ static int ti_opp_supply_set_opp(struct dev_pm_set_opp_data *data)
 	vdd_uv = _get_optimal_vdd_voltage(dev, &opp_data,
 					  new_supply_vbb->u_volt);
 
+	if (new_supply_vdd->u_volt_min < vdd_uv)
+		new_supply_vdd->u_volt_min = vdd_uv;
+
 	/* Scaling up? Scale voltage before frequency */
 	if (freq > old_freq) {
 		ret = _opp_set_voltage(dev, new_supply_vdd, vdd_uv, vdd_reg,
