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

From: Matthias Kaehlcke
Date: Thu Aug 02 2018 - 16:59:50 EST

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In reply to: Balakrishna Godavarthi: "Re: [PATCH v13 7/7] Bluetooth: hci_qca: Add support for Qualcomm Bluetooth chip wcn3990"
Next in thread: Balakrishna Godavarthi: "Re: [PATCH v13 0/7] Enable Bluetooth functionality for 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.

Next message: skannan: "Re: [PATCH v3 1/2] PM / devfreq: Generic CPU frequency to device frequency mapping governor"
Previous message: Stephen Boyd: "Re: [PATCH v10 00/10] drivers: Introduce firmware dnd clock river for ZynqMP core"
In reply to: Balakrishna Godavarthi: "Re: [PATCH v13 7/7] Bluetooth: hci_qca: Add support for Qualcomm Bluetooth chip wcn3990"
Next in thread: Balakrishna Godavarthi: "Re: [PATCH v13 0/7] Enable Bluetooth functionality for WCN3990"
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