Bluetooth: hci_qca: Don't vote for specific voltage

Devices with specific voltage requirements should not request voltage
from the driver, but instead rely on the system configuration to define
appropriate voltages for each rail.

This ensures that PMIC and board variations are accounted for, something
that the 0.1V range in the hci_qca driver currently tries to address.
But on the Lenovo Yoga C630 (with wcn3990) vddch0 is 3.1V, which means
the driver will fail to set the voltage.

Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>

drivers/bluetooth/hci_qca.c

@@ -130,8 +130,6 @@ enum qca_speed_type {
  */
 struct qca_vreg {
 	const char *name;
-	unsigned int min_uV;
-	unsigned int max_uV;
 	unsigned int load_uA;
 };
 
@@ -1334,21 +1332,21 @@ static const struct hci_uart_proto qca_proto = {
 static const struct qca_vreg_data qca_soc_data_wcn3990 = {
 	.soc_type = QCA_WCN3990,
 	.vregs = (struct qca_vreg []) {
-		{ "vddio",   1800000, 1900000,  15000  },
-		{ "vddxo",   1800000, 1900000,  80000  },
-		{ "vddrf",   1300000, 1350000,  300000 },
-		{ "vddch0",  3300000, 3400000,  450000 },
+		{ "vddio", 15000  },
+		{ "vddxo", 80000  },
+		{ "vddrf", 300000 },
+		{ "vddch0", 450000 },
 	},
 	.num_vregs = 4,
 };
 
 static const struct qca_vreg_data qca_soc_data_wcn3998 = {
 	.soc_type = QCA_WCN3998,
 	.vregs = (struct qca_vreg []) {
-		{ "vddio",   1800000, 1900000,  10000  },
-		{ "vddxo",   1800000, 1900000,  80000  },
-		{ "vddrf",   1300000, 1352000,  300000 },
-		{ "vddch0",  3300000, 3300000,  450000 },
+		{ "vddio", 10000  },
+		{ "vddxo", 80000  },
+		{ "vddrf", 300000 },
+		{ "vddch0", 450000 },
 	},
 	.num_vregs = 4,
 };
@@ -1388,13 +1386,6 @@ static int qca_power_off(struct hci_dev *hdev)
 static int qca_enable_regulator(struct qca_vreg vregs,
 				struct regulator *regulator)
 {
-	int ret;
-
-	ret = regulator_set_voltage(regulator, vregs.min_uV,
-				    vregs.max_uV);
-	if (ret)
-		return ret;
-
 	return regulator_enable(regulator);
 
 }
@@ -1403,7 +1394,6 @@ static void qca_disable_regulator(struct qca_vreg vregs,
 				  struct regulator *regulator)
 {
 	regulator_disable(regulator);
-	regulator_set_voltage(regulator, 0, vregs.max_uV);
 
 }