[PATCH v1] Bluetooth: hci_qca: Enable clocks required for BT SOC

[Balakrishna Godavarthi]

Instead of relying on other subsytem to turn ON clocks
required for BT SoC to operate, voting them from the driver.

Signed-off-by: Balakrishna Godavarthi <bgodavar@xxxxxxxxxxxxxx>
---
 drivers/bluetooth/hci_qca.c | 31 +++++++++++++++++++++++++++++--
 1 file changed, 29 insertions(+), 2 deletions(-)

diff --git a/drivers/bluetooth/hci_qca.c b/drivers/bluetooth/hci_qca.c
index f10bdf8e1fc5..dc95e378574b 100644
--- a/drivers/bluetooth/hci_qca.c
+++ b/drivers/bluetooth/hci_qca.c
@@ -164,6 +164,7 @@ struct qca_serdev {
 };
 
 static int qca_regulator_enable(struct qca_serdev *qcadev);
+static int qca_power_on(struct qca_serdev *qcadev);
 static void qca_regulator_disable(struct qca_serdev *qcadev);
 static void qca_power_shutdown(struct hci_uart *hu);
 static int qca_power_off(struct hci_dev *hdev);
@@ -528,7 +529,7 @@ static int qca_open(struct hci_uart *hu)
 		} else {
 			hu->init_speed = qcadev->init_speed;
 			hu->oper_speed = qcadev->oper_speed;
-			ret = qca_regulator_enable(qcadev);
+			ret = qca_power_on(qcadev);
 			if (ret) {
 				destroy_workqueue(qca->workqueue);
 				kfree_skb(qca->rx_skb);
@@ -1214,7 +1215,7 @@ static int qca_wcn3990_init(struct hci_uart *hu)
 	qcadev = serdev_device_get_drvdata(hu->serdev);
 	if (!qcadev->bt_power->vregs_on) {
 		serdev_device_close(hu->serdev);
-		ret = qca_regulator_enable(qcadev);
+		ret = qca_power_on(qcadev);
 		if (ret)
 			return ret;
 
@@ -1408,6 +1409,9 @@ static void qca_power_shutdown(struct hci_uart *hu)
 	host_set_baudrate(hu, 2400);
 	qca_send_power_pulse(hu, false);
 	qca_regulator_disable(qcadev);
+
+	if (qcadev->susclk)
+		clk_disable_unprepare(qcadev->susclk);
 }
 
 static int qca_power_off(struct hci_dev *hdev)
@@ -1423,6 +1427,20 @@ static int qca_power_off(struct hci_dev *hdev)
 	return 0;
 }
 
+static int qca_power_on(struct qca_serdev *qcadev)
+{
+	int err;
+
+	if (qcadev->susclk) {
+		err = clk_prepare_enable(qcadev->susclk);
+		if (err)
+			return err;
+	}
+
+	qca_regulator_enable(qcadev);
+	return 0;
+}
+
 static int qca_regulator_enable(struct qca_serdev *qcadev)
 {
 	struct qca_power *power = qcadev->bt_power;
@@ -1523,6 +1541,15 @@ static int qca_serdev_probe(struct serdev_device *serdev)
 
 		qcadev->bt_power->vregs_on = false;
 
+		if (qcadev->btsoc_type == QCA_WCN3990 ||
+		    qcadev->btsoc_type == QCA_WCN3991) {
+			qcadev->susclk = devm_clk_get(&serdev->dev, NULL);
+			if (IS_ERR(qcadev->susclk)) {
+				dev_err(&serdev->dev, "failed to acquire clk\n");
+				return PTR_ERR(qcadev->susclk);
+			}
+		}
+
 		device_property_read_u32(&serdev->dev, "max-speed",
 					 &qcadev->oper_speed);
 		if (!qcadev->oper_speed)
-- 
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