On Thu, May 24, 2018 at 09:30:51PM +0530, Balakrishna Godavarthi wrote:
> Add support to set voltage/current of various regulators
> to power up/down Bluetooth chip wcn3990.
>
> Signed-off-by: Balakrishna Godavarthi <bgodavar@xxxxxxxxxxxxxx>
> ---
>
> Changes in v6:
> * Hooked up qca_power to qca_serdev.
> * renamed all the naming inconsistency functions with qca_*
> * leveraged common code of ROME for wcn3990.
> * created wrapper functions for re-usable blocks.
> * updated function of _*regulator_enable and _*regualtor_disable.
> * removed redundant comments and functions.
> * addressed review comments.
>
> Changes in v5:
> * updated regulator vddpa min_uV to 1304000.
> * addressed review comments.
>
> Changes in v4:
> * Segregated the changes of btqca from hci_qca
> * rebased all changes on top of bluetooth-next.
> * addressed review comments.
> ---
>
> ...
>
> diff --git a/drivers/bluetooth/hci_qca.c b/drivers/bluetooth/hci_qca.c
> index cb1034998040..e235be0e5202 100644
> --- a/drivers/bluetooth/hci_qca.c
> +++ b/drivers/bluetooth/hci_qca.c
> ...
> +static void qca_set_init_speed(struct hci_uart *hu)
> +{
> + unsigned int speed = 0;
>
> - /* Setup initial baudrate */
> - speed = 0;
> if (hu->init_speed)
> speed = hu->init_speed;
> else if (hu->proto->init_speed)
> @@ -946,29 +1015,136 @@ static int qca_setup(struct hci_uart *hu)
>
> if (speed)
> host_set_baudrate(hu, speed);
> +}
> +
> +static int qca_set_operating_speed(struct hci_uart *hu, u32 *qca_baudrate)
> +{
This is a bit convoluted, with the function setting the speed and
returning it. I would suggest a qca_get_oper_speed() and
qca_get_init_speed(), and just have them return the value instead of
passing it through a pointer. You could then have a qca_set_speed()
which converts the baudrate to the value the chip understands, calls
qca_set_baudrate() and host_set_baudrate()
> +static int qca_setup(struct hci_uart *hu)
> +{
> + struct hci_dev *hdev = hu->hdev;
> + struct qca_data *qca = hu->priv;
> + struct qca_serdev *qcadev;
> + unsigned int speed, qca_baudrate = QCA_BAUDRATE_115200;
> + int ret;
> + int soc_ver;
> +
> + qcadev = serdev_device_get_drvdata(hu->serdev);
> +
> + switch (qcadev->btsoc_type) {
> + case BTQCA_CHEROKEE:
> + bt_dev_dbg(hdev, "setting up wcn3990");
> + /* Patch downloading has to be done without IBS mode */
> + clear_bit(STATE_IN_BAND_SLEEP_ENABLED, &qca->flags);
> + qca_set_init_speed(hu);
> + hci_uart_set_flow_control(hu, true);
> + ret = qca_send_vendor_cmd(hdev, CHEROKEE_POWERON_PULSE);
> + if (ret) {
> + bt_dev_err(hdev, "failed to send power on command");
> + return ret;
> + }
> +
> + /* Close and re-open the port */
As mentioned earlier, this comment doesn't provide any useful
information, it's evident from the code. Rather explain *why* the
close/open is needed.
> + serdev_device_close(hu->serdev);
> + ret = serdev_device_open(hu->serdev);
> + if (ret) {
> + bt_dev_err(hdev, "failed to open port");
> + return ret;
> + }
> +
> + qca_set_init_speed(hu);
> + hci_uart_set_flow_control(hu, false);
> + msleep(100);
Which step makes the delay necessary? I guess it's not enabling flow
control but probably sending the power on command. If that is correct
the delay should be done after the corresponding command.
> + ret = qca_patch_ver_req(hdev, &soc_ver);
> + if (ret < 0 || soc_ver == 0) {
> + bt_dev_err(hdev, "Failed to get version 0x%x", ret);
Probably better: "Failed to get version: %d" since ret contains an
errno and the problem wasn't that we couldn't get "version 0x<errno>".
> + return ret;
> + }
> +
> + bt_dev_info(hdev, "wcn3990 controller version 0x%08x", soc_ver);
> + hci_uart_set_flow_control(hu, true);
Repeatedly switching on and off of flow control is a bit noisy, I
wonder if it could be hidden in a wrapper. From the code it seems that
flow control is disabled (true) for init speed and and enabled (false)
for operating speed. If this is correct the hci_uart_set_flow_control()
calls could be moved inside qca_set_oper/init_speed(). struct qca_serdev
could have a flag indicating if flow control is supported at all to
skip the hci_uart_set_flow_control() calls for Rome.
Just an idea, no objections if you prefer to leave it as is and Marcel
is ok with it.
> + ret = qca_set_operating_speed(hu, &qca_baudrate);
> + if (ret)
> + return ret;
> + hci_uart_set_flow_control(hu, false);
> + /* Setup patch and NVM configurations */
> + ret = qca_uart_setup_cherokee(hdev, qca_baudrate, &soc_ver);
> +
> + break;
> +
> + default:
> + bt_dev_info(hdev, "ROME setup");
> +
> + /* Patch downloading has to be done without IBS mode */
> + clear_bit(STATE_IN_BAND_SLEEP_ENABLED, &qca->flags);
> +
> + /* Setup initial baudrate */
> + speed = 0;
> + if (hu->init_speed)
> + speed = hu->init_speed;
> + else if (hu->proto->init_speed)
> + speed = hu->proto->init_speed;
If you introduce helpers to determine the init/oper speed these should
also be used here. Probably best to do this in a separate patch.
> +
> + if (speed)
> + host_set_baudrate(hu, speed);
> +
> + /* Setup user speed if needed */
> + speed = 0;
> + if (hu->oper_speed)
> + speed = hu->oper_speed;
> + else if (hu->proto->oper_speed)
> + speed = hu->proto->oper_speed;
ditto
> +static void qca_disable_regulator(struct qca_vreg vregs,
> + struct regulator *regulator)
> +{
> + /* Disable the regulator if requested by user
> + * or when fault to enable any regulator.
> + */
This comment is not useful. The following code simply disables the
regulator, why this is done is a question of the caller.
> + regulator_disable(regulator);
> + regulator_set_voltage(regulator, 0, vregs.max_uV);
> + if (vregs.load_uA)
> + regulator_set_load(regulator, 0);
> +
> +}
> +
> +int qca_btsoc_power_setup(struct hci_uart *hu, bool on)
> +{
> + struct qca_vreg *vregs;
> + struct regulator_bulk_data *vreg_bulk;
> + struct qca_serdev *qcadev;
> + int i, num_vregs, ret = 0;
> +
> + qcadev = serdev_device_get_drvdata(hu->serdev);
> + if (!qcadev || !qcadev->bt_power || !qcadev->bt_power->vreg_data ||
> + !qcadev->bt_power->vreg_bulk)
> + return -EINVAL;
> +
> + vregs = qcadev->bt_power->vreg_data->vregs;
> + vreg_bulk = qcadev->bt_power->vreg_bulk;
> + num_vregs = qcadev->bt_power->vreg_data->num_vregs;
> + BT_DBG("on: %d", on);
> + if (on && !qcadev->bt_power->vregs_on) {
> + for (i = 0; i < num_vregs; i++) {
> + ret = qca_enable_regulator(vregs[i],
> + vreg_bulk[i].consumer);
> + if (ret)
> + break;
> + }
> + /* regulators failed */
Comment is not useful, BT_ERR below leaves things clear.
> + if (ret) {
> + BT_ERR("failed to enable regulator:%s", vregs[i].name);
> + /* turn off regulators which are enabled */
> + for (i = i - 1; i >= 0; i--)
> + qca_disable_regulator(vregs[i],
> + vreg_bulk[i].consumer);
> + } else {
> + qcadev->bt_power->vregs_on = true;
> + }
> + } else if (!on && qcadev->bt_power->vregs_on) {
> + /* turn off regulator in reverse order */
> + i = qcadev->bt_power->vreg_data->num_vregs - 1;
> + for ( ; i >= 0; i--)
> + qca_disable_regulator(vregs[i], vreg_bulk[i].consumer);
> + qcadev->bt_power->vregs_on = false;
> + }
> +
> + return ret;
> +}
> +
> +static int qca_init_regulators(struct qca_power *qca,
> + const struct qca_vreg *vregs, size_t num_vregs)
> +{
> + int i;
> +
> + qca->vreg_bulk = devm_kzalloc(qca->dev, num_vregs *
> + sizeof(struct regulator_bulk_data),
> + GFP_KERNEL);
> + if (!qca->vreg_bulk)
> + return -ENOMEM;
> +
> + for (i = 0; i < num_vregs; i++)
> + qca->vreg_bulk[i].supply = vregs[i].name;
> +
> + return devm_regulator_bulk_get(qca->dev, num_vregs, qca->vreg_bulk);
> +}
> +
> static int qca_serdev_probe(struct serdev_device *serdev)
> {
> struct qca_serdev *qcadev;
> + const struct qca_vreg_data *data;
> int err;
>
> qcadev = devm_kzalloc(&serdev->dev, sizeof(*qcadev), GFP_KERNEL);
> @@ -1014,34 +1301,72 @@ static int qca_serdev_probe(struct serdev_device *serdev)
> return -ENOMEM;
>
> qcadev->serdev_hu.serdev = serdev;
> + data = of_device_get_match_data(&serdev->dev);
> + if (data && data->soc_type == BTQCA_CHEROKEE)
> + qcadev->btsoc_type = BTQCA_CHEROKEE;
> + else
> + qcadev->btsoc_type = BTQCA_ROME;
> +
> serdev_device_set_drvdata(serdev, qcadev);
> + if (qcadev->btsoc_type == BTQCA_CHEROKEE) {
> + qcadev->bt_power = devm_kzalloc(&serdev->dev,
> + sizeof(struct qca_power),
> + GFP_KERNEL);
> + if (!qcadev->bt_power)
> + return -ENOMEM;
> +
> + qcadev->bt_power->dev = &serdev->dev;
> + qcadev->bt_power->vreg_data = data;
> + err = qca_init_regulators(qcadev->bt_power, data->vregs,
> + data->num_vregs);
> + if (err) {
> + BT_ERR("Failed to init regulators:%d", err);
> + devm_kfree(&serdev->dev, qcadev->bt_power->vreg_bulk);
> + devm_kfree(&serdev->dev, qcadev->bt_power);
Not necessary, the memory is allocated with devm_kzalloc(&serdev->dev,
...), therefore it is freed if probe() fails.
> + goto out;
> + }
>
> - qcadev->bt_en = devm_gpiod_get(&serdev->dev, "enable",
> - GPIOD_OUT_LOW);
> - if (IS_ERR(qcadev->bt_en)) {
> - dev_err(&serdev->dev, "failed to acquire enable gpio\n");
> - return PTR_ERR(qcadev->bt_en);
> - }
> + qcadev->bt_power->vregs_on = false;
> + device_property_read_u32(&serdev->dev, "max-speed",
> + &qcadev->oper_speed);
> + if (!qcadev->oper_speed)
> + BT_INFO("UART will pick default operating speed");
> + err = hci_uart_register_device(&qcadev->serdev_hu, &qca_proto);
> + if (err) {
> + BT_ERR("wcn3990 serdev registration failed");
> + devm_kfree(&serdev->dev, qcadev->bt_power->vreg_bulk);
> + devm_kfree(&serdev->dev, qcadev->bt_power);
no need to free memory.
> + goto out;
> + }
> + } else {
> + qcadev->bt_en = devm_gpiod_get(&serdev->dev, "enable",
> + GPIOD_OUT_LOW);
> + if (IS_ERR(qcadev->bt_en)) {
> + dev_err(&serdev->dev, "failed to acquire enable gpio\n");
> + return PTR_ERR(qcadev->bt_en);
> + }
>
> - 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);
> - }
> + 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);
> + }
>
> - err = clk_set_rate(qcadev->susclk, SUSCLK_RATE_32KHZ);
> - if (err)
> - return err;
> + err = clk_set_rate(qcadev->susclk, SUSCLK_RATE_32KHZ);
> + if (err)
> + return err;
>
> - err = clk_prepare_enable(qcadev->susclk);
> - if (err)
> - return err;
> + err = clk_prepare_enable(qcadev->susclk);
> + if (err)
> + return err;
>
> - err = hci_uart_register_device(&qcadev->serdev_hu, &qca_proto);
> - if (err)
> - clk_disable_unprepare(qcadev->susclk);
> + err = hci_uart_register_device(&qcadev->serdev_hu, &qca_proto);
> + if (err)
> + clk_disable_unprepare(qcadev->susclk);
> + }
> +
> +out: return err;
>
> - return err;
> }
>
> static void qca_serdev_remove(struct serdev_device *serdev)
> @@ -1050,11 +1375,17 @@ static void qca_serdev_remove(struct serdev_device *serdev)
>
> hci_uart_unregister_device(&qcadev->serdev_hu);
>
> - clk_disable_unprepare(qcadev->susclk);
> + if (qcadev->btsoc_type == BTQCA_CHEROKEE) {
> + devm_kfree(&serdev->dev, qcadev->bt_power->vreg_bulk);
> + devm_kfree(&serdev->dev, qcadev->bt_power);
no need to free memory
--
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