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SubjectRe: [PATCH v2 1/2] Bluetooth: hci_qca: Enable clocks required for BT SOC
Hi Marcel,

On 2020-02-01 01:21, Marcel Holtmann wrote:
> Hi Venkata,
>
>> Instead of relying on other subsytem to turn ON clocks
>> required for BT SoC to operate, voting them from the driver.
>>
>> Signed-off-by: Venkata Lakshmi Narayana Gubba
>> <gubbaven@codeaurora.org>
>> ---
>> v2:
>> * addressed forward declarations
>> * updated with devm_clk_get_optional()
>>
>> ---
>> drivers/bluetooth/hci_qca.c | 25 +++++++++++++++++++++++++
>> 1 file changed, 25 insertions(+)
>>
>> diff --git a/drivers/bluetooth/hci_qca.c b/drivers/bluetooth/hci_qca.c
>> index d6e0c99..73706f3 100644
>> --- a/drivers/bluetooth/hci_qca.c
>> +++ b/drivers/bluetooth/hci_qca.c
>> @@ -1738,6 +1738,15 @@ static int qca_power_off(struct hci_dev *hdev)
>> return 0;
>> }
>>
>> +static int qca_setup_clock(struct clk *clk, bool enable)
>> +{
>> + if (enable)
>> + return clk_prepare_enable(clk);
>> +
>> + clk_disable_unprepare(clk);
>> + return 0;
>> +}
>> +
>
> this function is pointless and it just complicated the code.

[Venkata] : Sure we will remove the function and will update in next
patch set.
>
>> static int qca_regulator_enable(struct qca_serdev *qcadev)
>> {
>> struct qca_power *power = qcadev->bt_power;
>> @@ -1755,6 +1764,13 @@ static int qca_regulator_enable(struct
>> qca_serdev *qcadev)
>>
>> power->vregs_on = true;
>>
>> + ret = qca_setup_clock(qcadev->susclk, true);
>
> ret = clk_prepare_enable(qcadev->susclk);

[Venkata] : Sure.We will update in next patch set.

>
>> + if (ret) {
>> + /* Turn off regulators to overcome power leakage */
>> + qca_regulator_disable(qcadev);
>> + return ret;
>> + }
>> +
>> return 0;
>> }
>>
>> @@ -1773,6 +1789,9 @@ static void qca_regulator_disable(struct
>> qca_serdev *qcadev)
>>
>> regulator_bulk_disable(power->num_vregs, power->vreg_bulk);
>> power->vregs_on = false;
>> +
>> + if (qcadev->susclk)
>> + qca_setup_clock(qcadev->susclk, false);
>
> clk_disable_unprepare(qcadev->susclk);

[Venkata] : Sure.We will update in next patch set.
>
>> }
>>
>> static int qca_init_regulators(struct qca_power *qca,
>> @@ -1839,6 +1858,12 @@ static int qca_serdev_probe(struct
>> serdev_device *serdev)
>>
>> qcadev->bt_power->vregs_on = false;
>>
>> + qcadev->susclk = devm_clk_get_optional(&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)
>
> Regards
>
> Marcel

Regards,
Venkata.

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