Re: [PATCH v5 2/4] Bluetooth: hci_qca: Add support for QTI Bluetooth chip wcn6855

From: Steev Klimaszewski
Date: Thu Mar 09 2023 - 15:25:35 EST

On Thu, Mar 9, 2023 at 11:08 AM Johan Hovold <johan@xxxxxxxxxx> wrote:
>
> On Wed, Feb 08, 2023 at 08:09:14PM -0600, Steev Klimaszewski wrote:
> > Added regulators,GPIOs and changes required to power on/off wcn6855.
> > Added support for firmware download for wcn6855.
> >
> > Signed-off-by: Steev Klimaszewski <steev@xxxxxxxx>
> > ---
> > Changes since v4:
> > * Remove unused firmware check because we don't have mbn firmware.
> > * Set qcadev->init_speed if it hasn't been set.
> >
> > Changes since v3:
> > * drop unused regulators
> >
> > Changes since v2:
> > * drop unnecessary commit info
> >
> > Changes since v1:
> > * None
> >
> > drivers/bluetooth/btqca.c | 9 ++++++-
> > drivers/bluetooth/btqca.h | 10 ++++++++
> > drivers/bluetooth/hci_qca.c | 50 ++++++++++++++++++++++++++++---------
> > 3 files changed, 56 insertions(+), 13 deletions(-)
> >
> > diff --git a/drivers/bluetooth/btqca.c b/drivers/bluetooth/btqca.c
> > index c9064d34d830..2f9d8bd27c38 100644
> > --- a/drivers/bluetooth/btqca.c
> > +++ b/drivers/bluetooth/btqca.c
> > @@ -614,6 +614,9 @@ int qca_uart_setup(struct hci_dev *hdev, uint8_t baudrate,
> > config.type = ELF_TYPE_PATCH;
> > snprintf(config.fwname, sizeof(config.fwname),
> > "qca/msbtfw%02x.mbn", rom_ver);
> > + } else if (soc_type == QCA_WCN6855) {
> > + snprintf(config.fwname, sizeof(config.fwname),
> > + "qca/hpbtfw%02x.tlv", rom_ver);
> > } else {
> > snprintf(config.fwname, sizeof(config.fwname),
> > "qca/rampatch_%08x.bin", soc_ver);
> > @@ -648,6 +651,9 @@ int qca_uart_setup(struct hci_dev *hdev, uint8_t baudrate,
> > else if (soc_type == QCA_WCN6750)
> > snprintf(config.fwname, sizeof(config.fwname),
> > "qca/msnv%02x.bin", rom_ver);
> > + else if (soc_type == QCA_WCN6855)
> > + snprintf(config.fwname, sizeof(config.fwname),
> > + "qca/hpnv%02x.bin", rom_ver);
> > else
> > snprintf(config.fwname, sizeof(config.fwname),
> > "qca/nvm_%08x.bin", soc_ver);
> > @@ -672,6 +678,7 @@ int qca_uart_setup(struct hci_dev *hdev, uint8_t baudrate,
> > case QCA_WCN3991:
> > case QCA_WCN3998:
> > case QCA_WCN6750:
> > + case QCA_WCN6855:
>
> Did you actually verify the microsoft extensions need this, or you are
> assuming it works as 6750?
>
It was 100% an assumption that since the 6750 does it, the 6855 does
too. I should know better than to assume since I used to work at a
device manufacturer but high hopes things have changed a bit in the
past 12 years ;)

> > hci_set_msft_opcode(hdev, 0xFD70);
> > break;
> > default:
> > @@ -685,7 +692,7 @@ int qca_uart_setup(struct hci_dev *hdev, uint8_t baudrate,
> > return err;
> > }
> >
> > - if (soc_type == QCA_WCN3991 || soc_type == QCA_WCN6750) {
> > + if (soc_type == QCA_WCN3991 || soc_type == QCA_WCN6750 || soc_type == QCA_WCN6855) {
>
> Line is now over 80 columns which is still the preferred limit.
>
> Perhaps this should now be a switch statement instead?
>
switch statement might work, I'll give it a shot here.

> > /* get fw build info */
> > err = qca_read_fw_build_info(hdev);
> > if (err < 0)
> > diff --git a/drivers/bluetooth/btqca.h b/drivers/bluetooth/btqca.h
> > index 61e9a50e66ae..b884095bcd9d 100644
> > --- a/drivers/bluetooth/btqca.h
> > +++ b/drivers/bluetooth/btqca.h
> > @@ -147,6 +147,7 @@ enum qca_btsoc_type {
> > QCA_WCN3991,
> > QCA_QCA6390,
> > QCA_WCN6750,
> > + QCA_WCN6855,
> > };
> >
> > #if IS_ENABLED(CONFIG_BT_QCA)
> > @@ -168,6 +169,10 @@ static inline bool qca_is_wcn6750(enum qca_btsoc_type soc_type)
> > {
> > return soc_type == QCA_WCN6750;
> > }
> > +static inline bool qca_is_wcn6855(enum qca_btsoc_type soc_type)
> > +{
> > + return soc_type == QCA_WCN6855;
> > +}
> >
> > #else
> >
> > @@ -206,6 +211,11 @@ static inline bool qca_is_wcn6750(enum qca_btsoc_type soc_type)
> > return false;
> > }
> >
> > +static inline bool qca_is_wcn6855(enum qca_btsoc_type soc_type)
> > +{
> > + return false;
> > +}
> > +
> > static inline int qca_send_pre_shutdown_cmd(struct hci_dev *hdev)
> > {
> > return -EOPNOTSUPP;
> > diff --git a/drivers/bluetooth/hci_qca.c b/drivers/bluetooth/hci_qca.c
> > index 3df8c3606e93..efc1c0306b4e 100644
> > --- a/drivers/bluetooth/hci_qca.c
> > +++ b/drivers/bluetooth/hci_qca.c
> > @@ -605,8 +605,7 @@ static int qca_open(struct hci_uart *hu)
> > if (hu->serdev) {
> > qcadev = serdev_device_get_drvdata(hu->serdev);
> >
> > - if (qca_is_wcn399x(qcadev->btsoc_type) ||
> > - qca_is_wcn6750(qcadev->btsoc_type))
> > + if (!(qcadev->init_speed))
> > hu->init_speed = qcadev->init_speed;
>
> This change makes no sense.
>
> In fact, it seems the driver never sets init_speed anywhere.
>
> Either way, it should not be needed for wcn6855.
>

So, that was a request from an earlier review, but if it's not needed
for 6855, I'll just drop it, and then I don't need to do any of those
changes :D

> >
> > if (qcadev->oper_speed)
> > @@ -1317,7 +1316,8 @@ static int qca_set_baudrate(struct hci_dev *hdev, uint8_t baudrate)
> >
> > /* Give the controller time to process the request */
> > if (qca_is_wcn399x(qca_soc_type(hu)) ||
> > - qca_is_wcn6750(qca_soc_type(hu)))
> > + qca_is_wcn6750(qca_soc_type(hu)) ||
> > + qca_is_wcn6855(qca_soc_type(hu)))
> > usleep_range(1000, 10000);
> > else
> > msleep(300);
> > @@ -1394,7 +1394,8 @@ static unsigned int qca_get_speed(struct hci_uart *hu,
> > static int qca_check_speeds(struct hci_uart *hu)
> > {
> > if (qca_is_wcn399x(qca_soc_type(hu)) ||
> > - qca_is_wcn6750(qca_soc_type(hu))) {
> > + qca_is_wcn6750(qca_soc_type(hu)) ||
> > + qca_is_wcn6855(qca_soc_type(hu))) {
> > if (!qca_get_speed(hu, QCA_INIT_SPEED) &&
> > !qca_get_speed(hu, QCA_OPER_SPEED))
> > return -EINVAL;
> > @@ -1682,7 +1683,8 @@ static int qca_power_on(struct hci_dev *hdev)
> > return 0;
> >
> > if (qca_is_wcn399x(soc_type) ||
> > - qca_is_wcn6750(soc_type)) {
> > + qca_is_wcn6750(soc_type) ||
> > + qca_is_wcn6855(soc_type)) {
> > ret = qca_regulator_init(hu);
> > } else {
> > qcadev = serdev_device_get_drvdata(hu->serdev);
> > @@ -1723,7 +1725,8 @@ static int qca_setup(struct hci_uart *hu)
> >
> > bt_dev_info(hdev, "setting up %s",
> > qca_is_wcn399x(soc_type) ? "wcn399x" :
> > - (soc_type == QCA_WCN6750) ? "wcn6750" : "ROME/QCA6390");
> > + (soc_type == QCA_WCN6750) ? "wcn6750" :
> > + (soc_type == QCA_WCN6855) ? "wcn6855" : "ROME/QCA6390");
>
> This is hideous, but not your fault...
>
It is, and, I'm not entirely sure we need it? I mean, it's nice to
show that it's now starting to set up, but it isn't particularly
helpful for end users or making sure things are working?

> >
> > qca->memdump_state = QCA_MEMDUMP_IDLE;
> >
> > @@ -1735,7 +1738,8 @@ static int qca_setup(struct hci_uart *hu)
> > clear_bit(QCA_SSR_TRIGGERED, &qca->flags);
> >
> > if (qca_is_wcn399x(soc_type) ||
> > - qca_is_wcn6750(soc_type)) {
> > + qca_is_wcn6750(soc_type) ||
> > + qca_is_wcn6855(soc_type)) {
> > set_bit(HCI_QUIRK_USE_BDADDR_PROPERTY, &hdev->quirks);
> > hci_set_aosp_capable(hdev);
> >
> > @@ -1757,7 +1761,8 @@ static int qca_setup(struct hci_uart *hu)
> > }
> >
> > if (!(qca_is_wcn399x(soc_type) ||
> > - qca_is_wcn6750(soc_type))) {
> > + qca_is_wcn6750(soc_type) ||
> > + qca_is_wcn6855(soc_type))) {
>
> Perhaps you can add a leading space while changing this so that the
> open-parenthesis alignment makes sense.
>
> > /* Get QCA version information */
> > ret = qca_read_soc_version(hdev, &ver, soc_type);
> > if (ret)
> > @@ -1883,6 +1888,20 @@ static const struct qca_device_data qca_soc_data_wcn6750 = {
> > .capabilities = QCA_CAP_WIDEBAND_SPEECH | QCA_CAP_VALID_LE_STATES,
> > };
> >
> > +static const struct qca_device_data qca_soc_data_wcn6855 = {
> > + .soc_type = QCA_WCN6855,
> > + .vregs = (struct qca_vreg []) {
> > + { "vddio", 5000 },
> > + { "vddbtcxmx", 126000 },
> > + { "vddrfacmn", 12500 },
> > + { "vddrfa0p8", 102000 },
> > + { "vddrfa1p7", 302000 },
> > + { "vddrfa1p2", 257000 },
>
> Hmm. More random regulator load values. I really think we should get rid
> of this but that's a separate discussion.
>
Bjorn specifically requested that he wanted me to leave them in. I'm
not married to them, and don't care one way or the other, I just
wanted working bluetooth since audio wasn't quite ready yet :)

> > + },
> > + .num_vregs = 6,
> > + .capabilities = QCA_CAP_WIDEBAND_SPEECH | QCA_CAP_VALID_LE_STATES,
> > +};
> > +
> > static void qca_power_shutdown(struct hci_uart *hu)
> > {
> > struct qca_serdev *qcadev;
>
> As I mentioned elsewhere, you need to update also this function so that
> wcn6855 can be powered down.

Sorry, I do have that locally, I just haven't pushed a v6 as I was
looking at Tim's v2 of the qca2066 and was wondering if I should or
shouldn't continue working on my version of the driver?

>
> > @@ -2047,7 +2066,8 @@ static int qca_serdev_probe(struct serdev_device *serdev)
> >
> > if (data &&
> > (qca_is_wcn399x(data->soc_type) ||
> > - qca_is_wcn6750(data->soc_type))) {
> > + qca_is_wcn6750(data->soc_type) ||
> > + qca_is_wcn6855(data->soc_type))) {
>
> Perhaps you fix the alignment here too.
>
> > qcadev->btsoc_type = data->soc_type;
> > qcadev->bt_power = devm_kzalloc(&serdev->dev,
> > sizeof(struct qca_power),
> > @@ -2067,14 +2087,18 @@ static int qca_serdev_probe(struct serdev_device *serdev)
> >
> > qcadev->bt_en = devm_gpiod_get_optional(&serdev->dev, "enable",
> > GPIOD_OUT_LOW);
> > - if (IS_ERR_OR_NULL(qcadev->bt_en) && data->soc_type == QCA_WCN6750) {
> > + if (IS_ERR_OR_NULL(qcadev->bt_en)
> > + && (data->soc_type == QCA_WCN6750 ||
>
> && operator should go on the previous line before the line break.
>
> > + data->soc_type == QCA_WCN6855)) {
> > dev_err(&serdev->dev, "failed to acquire BT_EN gpio\n");
> > power_ctrl_enabled = false;
> > }
> >
> > qcadev->sw_ctrl = devm_gpiod_get_optional(&serdev->dev, "swctrl",
> > GPIOD_IN);
> > - if (IS_ERR_OR_NULL(qcadev->sw_ctrl) && data->soc_type == QCA_WCN6750)
> > + if (IS_ERR_OR_NULL(qcadev->sw_ctrl)
> > + && (data->soc_type == QCA_WCN6750 ||
>
> Same here.
>
> > + data->soc_type == QCA_WCN6855))
> > dev_warn(&serdev->dev, "failed to acquire SW_CTRL gpio\n");
> >
> > qcadev->susclk = devm_clk_get_optional(&serdev->dev, NULL);
> > @@ -2150,7 +2174,8 @@ static void qca_serdev_remove(struct serdev_device *serdev)
> > struct qca_power *power = qcadev->bt_power;
> >
> > if ((qca_is_wcn399x(qcadev->btsoc_type) ||
> > - qca_is_wcn6750(qcadev->btsoc_type)) &&
> > + qca_is_wcn6750(qcadev->btsoc_type) ||
> > + qca_is_wcn6855(qcadev->btsoc_type)) &&
> > power->vregs_on)
> > qca_power_shutdown(&qcadev->serdev_hu);
> > else if (qcadev->susclk)
> > @@ -2335,6 +2360,7 @@ static const struct of_device_id qca_bluetooth_of_match[] = {
> > { .compatible = "qcom,wcn3991-bt", .data = &qca_soc_data_wcn3991},
> > { .compatible = "qcom,wcn3998-bt", .data = &qca_soc_data_wcn3998},
> > { .compatible = "qcom,wcn6750-bt", .data = &qca_soc_data_wcn6750},
> > + { .compatible = "qcom,wcn6855-bt", .data = &qca_soc_data_wcn6855},
> > { /* sentinel */ }
> > };
> > MODULE_DEVICE_TABLE(of, qca_bluetooth_of_match);
>
> With power-off handling fixed, this seems to work as quite well on my
> X13s with 6.3-rc1. Nice job!
>
> Btw, apart from the frame reassembly error, I'm also seeing:
>
> Bluetooth: Received HCI_IBS_WAKE_ACK in tx state 0
>
> during probe.
>
I'm still not sure where the frame reassembly error comes from, and I
don't know how to get more info to figure it out either, if anyone
happens to have any guidance for that, I would love some.
Additionally, it doesn't always happen. It seems to happen on the
first load of the module, however, running modprobe -r && modprobe in
a loop (with the powerdown properly modified so the log isn't full of
splats), it doesn't seem to occur every time. Likewise for the
WAKE_ACK.

> Johan