Re: [PATCH v13 7/7] Bluetooth: hci_qca: Add support for Qualcomm Bluetooth chip wcn3990

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On Fri, Aug 03, 2018 at 01:40:43AM +0530, Balakrishna Godavarthi wrote:
> On 2018-08-03 01:27, Matthias Kaehlcke wrote:
> > On Fri, Aug 03, 2018 at 12:37:32AM +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>
> > > Reviewed-by: Matthias Kaehlcke <mka@xxxxxxxxxxxx>
> > > ---
> > > Changes in v13:
> > >    * updated review comments.
> > > 
> > > Changes in v12:
> > >     * removed retrying iteration loop in qca_wcn3990_init.
> > > 
> > > Changes in v11:
> > >     * removed support to read regulator currents from dts.
> > >     * updated review comments.
> > > 
> > > Changes in v10:
> > >     * added support to read regulator currents from dts.
> > >     * added support to try to connect with chip if it fails to
> > > respond to initial commands
> > >     * updated review comments.
> > > 
> > > changes in v9:
> > >     * moved flow control to vendor and set_baudarte functions.
> > >     * removed parent regs.
> > > 
> > > changes in v8:
> > >     * closing qca buffer, if qca_power_setup fails
> > >     * chnaged ibs start timer function call location.
> > >     * updated review comments.
> > > 
> > > changes in v7:
> > >     * addressed review comments.
> > > 
> > > 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.
> > > ---
> > >  drivers/bluetooth/btqca.h   |   3 +
> > >  drivers/bluetooth/hci_qca.c | 402
> > > +++++++++++++++++++++++++++++++-----
> > >  2 files changed, 358 insertions(+), 47 deletions(-)
> > > 
> > > diff --git a/drivers/bluetooth/btqca.h b/drivers/bluetooth/btqca.h
> > > index a9c2779f3e07..0c01f375fe83 100644
> > > --- a/drivers/bluetooth/btqca.h
> > > +++ b/drivers/bluetooth/btqca.h
> > > @@ -37,6 +37,9 @@
> > >  #define EDL_TAG_ID_HCI			(17)
> > >  #define EDL_TAG_ID_DEEP_SLEEP		(27)
> > > 
> > > +#define QCA_WCN3990_POWERON_PULSE	0xFC
> > > +#define QCA_WCN3990_POWEROFF_PULSE	0xC0
> > > +
> > >  enum qca_bardrate {
> > >  	QCA_BAUDRATE_115200 	= 0,
> > >  	QCA_BAUDRATE_57600,
> > > diff --git a/drivers/bluetooth/hci_qca.c b/drivers/bluetooth/hci_qca.c
> > > index a6e7d38ef931..66f36527e4dd 100644
> > > --- a/drivers/bluetooth/hci_qca.c
> > > +++ b/drivers/bluetooth/hci_qca.c
> > > @@ -5,7 +5,7 @@
> > >   *  protocol extension to H4.
> > >   *
> > >   *  Copyright (C) 2007 Texas Instruments, Inc.
> > > - *  Copyright (c) 2010, 2012 The Linux Foundation. All rights
> > > reserved.
> > > + *  Copyright (c) 2010, 2012, 2018 The Linux Foundation. All rights
> > > reserved.
> > >   *
> > >   *  Acknowledgements:
> > >   *  This file is based on hci_ll.c, which was...
> > > @@ -31,9 +31,14 @@
> > >  #include <linux/kernel.h>
> > >  #include <linux/clk.h>
> > >  #include <linux/debugfs.h>
> > > +#include <linux/delay.h>
> > > +#include <linux/device.h>
> > >  #include <linux/gpio/consumer.h>
> > >  #include <linux/mod_devicetable.h>
> > >  #include <linux/module.h>
> > > +#include <linux/of_device.h>
> > > +#include <linux/platform_device.h>
> > > +#include <linux/regulator/consumer.h>
> > >  #include <linux/serdev.h>
> > > 
> > >  #include <net/bluetooth/bluetooth.h>
> > > @@ -124,12 +129,46 @@ enum qca_speed_type {
> > >  	QCA_OPER_SPEED
> > >  };
> > > 
> > > +/*
> > > + * Voltage regulator information required for configuring the
> > > + * QCA Bluetooth chipset
> > > + */
> > > +struct qca_vreg {
> > > +	const char *name;
> > > +	unsigned int min_uV;
> > > +	unsigned int max_uV;
> > > +	unsigned int load_uA;
> > > +};
> > > +
> > > +struct qca_vreg_data {
> > > +	enum qca_btsoc_type soc_type;
> > > +	struct qca_vreg *vregs;
> > > +	size_t num_vregs;
> > > +};
> > > +
> > > +/*
> > > + * Platform data for the QCA Bluetooth power driver.
> > > + */
> > > +struct qca_power {
> > > +	struct device *dev;
> > > +	const struct qca_vreg_data *vreg_data;
> > > +	struct regulator_bulk_data *vreg_bulk;
> > > +	bool vregs_on;
> > > +};
> > > +
> > >  struct qca_serdev {
> > >  	struct hci_uart	 serdev_hu;
> > >  	struct gpio_desc *bt_en;
> > >  	struct clk	 *susclk;
> > > +	enum qca_btsoc_type btsoc_type;
> > > +	struct qca_power *bt_power;
> > > +	u32 init_speed;
> > > +	u32 oper_speed;
> > >  };
> > > 
> > > +static int qca_power_setup(struct hci_uart *hu, bool on);
> > > +static void qca_power_shutdown(struct hci_dev *hdev);
> > > +
> > >  static void __serial_clock_on(struct tty_struct *tty)
> > >  {
> > >  	/* TODO: Some chipset requires to enable UART clock on client
> > > @@ -407,6 +446,7 @@ static int qca_open(struct hci_uart *hu)
> > >  {
> > >  	struct qca_serdev *qcadev;
> > >  	struct qca_data *qca;
> > > +	int ret;
> > > 
> > >  	BT_DBG("hu %p qca_open", hu);
> > > 
> > > @@ -458,19 +498,32 @@ static int qca_open(struct hci_uart *hu)
> > > 
> > >  	hu->priv = qca;
> > > 
> > > -	timer_setup(&qca->wake_retrans_timer,
> > > hci_ibs_wake_retrans_timeout, 0);
> > > -	qca->wake_retrans = IBS_WAKE_RETRANS_TIMEOUT_MS;
> > > -
> > > -	timer_setup(&qca->tx_idle_timer, hci_ibs_tx_idle_timeout, 0);
> > > -	qca->tx_idle_delay = IBS_TX_IDLE_TIMEOUT_MS;
> > > -
> > >  	if (hu->serdev) {
> > >  		serdev_device_open(hu->serdev);
> > > 
> > >  		qcadev = serdev_device_get_drvdata(hu->serdev);
> > > -		gpiod_set_value_cansleep(qcadev->bt_en, 1);
> > > +		if (qcadev->btsoc_type != QCA_WCN3990) {
> > > +			gpiod_set_value_cansleep(qcadev->bt_en, 1);
> > > +		} else {
> > > +			hu->init_speed = qcadev->init_speed;
> > > +			hu->oper_speed = qcadev->oper_speed;
> > > +			ret = qca_power_setup(hu, true);
> > > +			if (ret) {
> > > +				destroy_workqueue(qca->workqueue);
> > > +				kfree_skb(qca->rx_skb);
> > > +				hu->priv = NULL;
> > > +				kfree(qca);
> > > +				return ret;
> > > +			}
> > > +		}
> > >  	}
> > > 
> > > +	timer_setup(&qca->wake_retrans_timer,
> > > hci_ibs_wake_retrans_timeout, 0);
> > > +	qca->wake_retrans = IBS_WAKE_RETRANS_TIMEOUT_MS;
> > > +
> > > +	timer_setup(&qca->tx_idle_timer, hci_ibs_tx_idle_timeout, 0);
> > > +	qca->tx_idle_delay = IBS_TX_IDLE_TIMEOUT_MS;
> > > +
> > >  	BT_DBG("HCI_UART_QCA open, tx_idle_delay=%u, wake_retrans=%u",
> > >  	       qca->tx_idle_delay, qca->wake_retrans);
> > > 
> > > @@ -554,10 +607,13 @@ static int qca_close(struct hci_uart *hu)
> > >  	qca->hu = NULL;
> > > 
> > >  	if (hu->serdev) {
> > > -		serdev_device_close(hu->serdev);
> > > -
> > >  		qcadev = serdev_device_get_drvdata(hu->serdev);
> > > -		gpiod_set_value_cansleep(qcadev->bt_en, 0);
> > > +		if (qcadev->btsoc_type == QCA_WCN3990)
> > > +			qca_power_shutdown(hu->hdev);
> > > +		else
> > > +			gpiod_set_value_cansleep(qcadev->bt_en, 0);
> > > +
> > > +		serdev_device_close(hu->serdev);
> > >  	}
> > > 
> > >  	kfree_skb(qca->rx_skb);
> > > @@ -891,6 +947,7 @@ static int qca_set_baudrate(struct hci_dev
> > > *hdev, uint8_t baudrate)
> > >  	struct hci_uart *hu = hci_get_drvdata(hdev);
> > >  	struct qca_data *qca = hu->priv;
> > >  	struct sk_buff *skb;
> > > +	struct qca_serdev *qcadev;
> > >  	u8 cmd[] = { 0x01, 0x48, 0xFC, 0x01, 0x00 };
> > > 
> > >  	if (baudrate > QCA_BAUDRATE_3200000)
> > > @@ -904,6 +961,13 @@ static int qca_set_baudrate(struct hci_dev
> > > *hdev, uint8_t baudrate)
> > >  		return -ENOMEM;
> > >  	}
> > > 
> > > +	/* Disabling hardware flow control is mandatory while
> > > +	 * sending change baudrate request to wcn3990 SoC.
> > > +	 */
> > > +	qcadev = serdev_device_get_drvdata(hu->serdev);
> > > +	if (qcadev->btsoc_type == QCA_WCN3990)
> > > +		hci_uart_set_flow_control(hu, true);
> > > +
> > >  	/* Assign commands to change baudrate and packet type. */
> > >  	skb_put_data(skb, cmd, sizeof(cmd));
> > >  	hci_skb_pkt_type(skb) = HCI_COMMAND_PKT;
> > > @@ -919,6 +983,9 @@ static int qca_set_baudrate(struct hci_dev
> > > *hdev, uint8_t baudrate)
> > >  	schedule_timeout(msecs_to_jiffies(BAUDRATE_SETTLE_TIMEOUT_MS));
> > >  	set_current_state(TASK_RUNNING);
> > > 
> > > +	if (qcadev->btsoc_type == QCA_WCN3990)
> > > +		hci_uart_set_flow_control(hu, false);
> > > +
> > >  	return 0;
> > >  }
> > > 
> > > @@ -930,6 +997,43 @@ static inline void host_set_baudrate(struct
> > > hci_uart *hu, unsigned int speed)
> > >  		hci_uart_set_baudrate(hu, speed);
> > >  }
> > > 
> > > +static int qca_send_power_pulse(struct hci_dev *hdev, u8 cmd)
> > > +{
> > > +	struct hci_uart *hu = hci_get_drvdata(hdev);
> > > +	struct qca_data *qca = hu->priv;
> > > +	struct sk_buff *skb;
> > > +
> > > +	/* These power pulses are single byte command which are sent
> > > +	 * at required baudrate to wcn3990. On wcn3990, we have an external
> > > +	 * circuit at Tx pin which decodes the pulse sent at specific
> > > baudrate.
> > > +	 * For example, wcn3990 supports RF COEX antenna for both Wi-Fi/BT
> > > +	 * and also we use the same power inputs to turn on and off for
> > > +	 * Wi-Fi/BT. Powering up the power sources will not enable BT, until
> > > +	 * we send a power on pulse at 115200 bps. This algorithm will
> > > help to
> > > +	 * save power. Disabling hardware flow control is mandatory while
> > > +	 * sending power pulses to SoC.
> > > +	 */
> > > +	bt_dev_dbg(hdev, "sending power pulse %02x to SoC", cmd);
> > > +
> > > +	skb = bt_skb_alloc(sizeof(cmd), GFP_KERNEL);
> > > +	if (!skb)
> > > +		return -ENOMEM;
> > > +
> > > +	hci_uart_set_flow_control(hu, true);
> > > +
> > > +	skb_put_u8(skb, cmd);
> > > +	hci_skb_pkt_type(skb) = HCI_COMMAND_PKT;
> > > +
> > > +	skb_queue_tail(&qca->txq, skb);
> > > +	hci_uart_tx_wakeup(hu);
> > > +
> > > +	/* Wait for 100 uS for SoC to settle down */
> > > +	usleep_range(100, 200);
> > > +	hci_uart_set_flow_control(hu, false);
> > > +
> > > +	return 0;
> > > +}
> > > +
> > >  static unsigned int qca_get_speed(struct hci_uart *hu,
> > >  				  enum qca_speed_type speed_type)
> > >  {
> > > @@ -952,9 +1056,18 @@ static unsigned int qca_get_speed(struct
> > > hci_uart *hu,
> > > 
> > >  static int qca_check_speeds(struct hci_uart *hu)
> > >  {
> > > -	if (!qca_get_speed(hu, QCA_INIT_SPEED) ||
> > > -	    !qca_get_speed(hu, QCA_OPER_SPEED))
> > > -		return -EINVAL;
> > > +	struct qca_serdev *qcadev;
> > > +
> > > +	qcadev = serdev_device_get_drvdata(hu->serdev);
> > > +	if (qcadev->btsoc_type == QCA_WCN3990) {
> > > +		if (!qca_get_speed(hu, QCA_INIT_SPEED) &&
> > > +		    !qca_get_speed(hu, QCA_OPER_SPEED))
> > > +			return -EINVAL;
> > > +	} else {
> > > +		if (!qca_get_speed(hu, QCA_INIT_SPEED) ||
> > > +		    !qca_get_speed(hu, QCA_OPER_SPEED))
> > > +			return -EINVAL;
> > > +	}
> > > 
> > >  	return 0;
> > >  }
> > > @@ -974,7 +1087,7 @@ static int qca_set_speed(struct hci_uart *hu,
> > > enum qca_speed_type speed_type)
> > >  			return 0;
> > > 
> > >  		qca_baudrate = qca_get_baudrate_value(speed);
> > > -		bt_dev_info(hu->hdev, "Set UART speed to %d", speed);
> > > +		bt_dev_dbg(hu->hdev, "Set UART speed to %d", speed);
> > >  		ret = qca_set_baudrate(hu->hdev, qca_baudrate);
> > >  		if (ret)
> > >  			return ret;
> > > @@ -985,15 +1098,51 @@ static int qca_set_speed(struct hci_uart *hu,
> > > enum qca_speed_type speed_type)
> > >  	return 0;
> > >  }
> > > 
> > > +static int qca_wcn3990_init(struct hci_uart *hu, u32 *soc_ver)
> > > +{
> > 
> > I focussed more on other things in the last review rounds and
> > overlooked that qca_read_soc_version() and the soc_ver pointer slipped
> > in here with v10 (v9: https://patchwork.kernel.org/patch/10510029/).
> > 
> > In a similar line as in an earlier discussion about reading the SoC
> > version in qca_uart_setup()
> > (https://patchwork.kernel.org/patch/10467903/)
> > I don't think the init function is the right place and it shouldn't
> > receive this soc_ver parameter about which it doesn't really
> > care. Please switch back as it was in v9 and read the SoC version in
> > qca_setup() (like it is done for Rome).
> > 
> > Then we should be done from my side.
> 
> so it should be some thing like this?
> 
> if (qcadev->btsoc_type == QCA_WCN3990) {
> 		bt_dev_info(hdev, "setting up wcn3990");
> 		ret = qca_wcn3990_init(hu);
> 		if (ret)
> 			return ret;
>                 hci_uart_set_flow_control(hu, false);
>                 ret = qca_read_soc_version(hdev, &soc_ver);
>                 if (ret)
>                      return ret;
> 	}

Enabling flow control can be considered part of the initialization
and be inside qca_wcn3990_init(), as it was with v9.
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