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SubjectRe: [PATCH v1] Bluetooth: hci_qca: Enable clocks required for BT SOC
On Thu, Nov 14, 2019 at 01:44:30PM +0530, Balakrishna Godavarthi wrote:
> 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@codeaurora.org>
> ---
> 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);
> + }

This will break existing users. Use devm_clk_get_optional() and at most
raise a warning if the clock doesn't exist.

It would also be nice to add the clock to the affected devices in the tree
if possible:

arch/arm64/boot/dts/qcom/msm8998-clamshell.dtsi: compatible = "qcom,wcn3990-bt";
arch/arm64/boot/dts/qcom/msm8998-mtp.dtsi: compatible = "qcom,wcn3990-bt";
arch/arm64/boot/dts/qcom/qcs404-evb.dtsi: compatible = "qcom,wcn3990-bt";
arch/arm64/boot/dts/qcom/sdm845-cheza.dtsi: compatible = "qcom,wcn3990-bt";
arch/arm64/boot/dts/qcom/sdm845-db845c.dts: compatible = "qcom,wcn3990-bt";
arch/arm64/boot/dts/qcom/sdm850-lenovo-yoga-c630.dts: compatible = "qcom,wcn3990-bt";

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