Hi Matthias,
On 2018-06-22 03:39, Matthias Kaehlcke wrote:
On Thu, Jun 21, 2018 at 04:50:28PM +0530, Balakrishna Godavarthi wrote:
Hi Matthias,
On 2018-06-21 05:03, Matthias Kaehlcke wrote:
> Hi Balakrishna,
>
> On Wed, Jun 20, 2018 at 04:23:25PM +0530, Balakrishna Godavarthi wrote:
> > Hi Matthias,
> >
> > On 2018-06-20 01:33, Matthias Kaehlcke wrote:
> > > On Tue, Jun 19, 2018 at 12:39:07PM +0530, Balakrishna Godavarthi wrote:
> > > > Hi Matthias,
> > > >
> > > > Please find my comments inline.
> > > >
> > > > On 2018-06-19 02:49, Matthias Kaehlcke wrote:
> > > > > On Sat, Jun 16, 2018 at 11:57:14AM +0530, Balakrishna Godavarthi wrote:
> > > > >
> > > > > > @@ -337,19 +337,20 @@ int qca_uart_setup(struct hci_dev *hdev,
> > > > > > uint8_t baudrate)
> > > > > >
> > > > > > config.user_baud_rate = baudrate;
> > > > > >
> > > > > > - /* Get QCA version information */
> > > > > > - err = qca_read_soc_version(hdev, &rome_ver);
> > > > > > - if (err < 0 || rome_ver == 0) {
> > > > > > - bt_dev_err(hdev, "QCA Failed to get version %d", err);
> > > > > > - return err;
> > > > > > + if (!soc_ver) {
> > > > > > + /* Get QCA version information */
> > > > > > + err = qca_read_soc_version(hdev, &soc_ver);
> > > > > > + if (err < 0 || soc_ver == 0) {
> > > > > > + bt_dev_err(hdev, "QCA Failed to get version %d", err);
> > > > > > + return err;
> > > > > > + }
> > > > > > + bt_dev_info(hdev, "QCA controller version 0x%08x", soc_ver);
> > > > > > }
> > > > >
> > > > > Why is this needed? A caller that passes in soc_ver = 0 could just
> > > > > call qca_read_soc_version() themselves.
> > > > [Bala]: hci_qca support two chip one ROME (already up-streamed) and
> > > > other
> > > > wcn3990.
> > > > there setup sequence differs.
> > > >
> > > > wcn3900:
> > > > 1. set baudrate to 115200
> > > > 2. read soc version
> > > > 3. set baudarte to 3.2Mbps
> > > > 4. download firmware. (calls qca_uart_setup)
> > > >
> > > > ROME:
> > > > 1. set baudrate to 3.0 mbps
> > > > 2. calls qca_uart_setup to read soc version and download
> > > > firmware.
> > > >
> > > > so to make use of existing function qca_setup_uart(). passing
> > > > soc_ver
> > > > as argument.
> > > > if soc_ver is zero, then read soc version (i.e. for ROME chip).
> > > >
> > > > Pls let me know, if you have any queries.
> > >
> > > I don't really understand this argumentation. Let's look at the code
> > > at the end of this series, where both Rome and wcn3900 are supported:
> > >
> > > https://chromium-review.googlesource.com/c/chromiumos/third_party/kernel/+/1045608/6/drivers/bluetooth/hci_qca.c#1059
> > >
> > > The version could be read (for Rome only) after setting the operating
> > > speed:
> >
> > [Bala]: yes we can read SoC version after setting operating baud
> > rate. an
> > advice from SoC vendor that, read SoC version before setting operating
> > speed.
> > one advantage from reading SoC version before setting
> > operating
> > baudrate,it will helps us to understand whether the soc is
> > responding to any
> > commands in default baud rate
> > before setting operating speed.
>
> Is the recommendation for Rome or wcn3990? I was referring to Rome and
> the current code sets the operating speed and then reads the SoC
> version (inside qca_uart_setup())
>
[Bala]: my statement is wrt to wcn3990. yes, ROME will set operating
speed
and read version.
> > > https://chromium-review.googlesource.com/c/chromiumos/third_party/kernel/+/1045608/6/drivers/bluetooth/hci_qca.c#1111
> > >
> > > I concede that having two "if (qcadev->btsoc_type == XYZ)" branches in
> > > qca_setup() is kinda ugly, but I think it's still better than the
> > > conditional call of qca_read_soc_version() in qca_uart_setup().
> >
> > [Bala]: we require an if-else block for soc type.As wcn3900 support
> > hardware flow control where as ROME is not supporting hardware flow
> > control.
>
> Since you mention if-else and flow control I'm not sure if you
> understood correctly what I suggested. My suggestion is to add
> something like this:
>
> if (qcadev->btsoc_type == QCA_ROME) {
> ret = qca_read_soc_version(hdev, &soc_ver);
> if (ret < 0 || soc_ver == 0) {
> // Note mka@: we might want to skip this log,
> // qca_read_soc_version() already logs in all error paths
> bt_dev_err(hdev, "Failed to get version %d", ret);
> return ret;
> }
> }
>
> right here:
>
> https://chromium-review.googlesource.com/c/chromiumos/third_party/kernel/+/1045608/6/drivers/bluetooth/hci_qca.c#1111
>
> which is functionally equivalent to the current code.
>
> You could even do the error check in the common code (just checking
> for 'soc_ver == 0', assuming that qca_read_soc_version() doesn't set
> it to something different in case of error).
>
> Anyway, I won't insist if you prefer it as is and Marcel is ok with it.
[Bala]: thanks for clarifying my doubt, but if remove the
qca_read_soc_version() from qca_uart_setup() and handle it
qca_setup().
in that case, we will have common blocks of code, when we
integrate
wcn3990 into existing qca_setup()
Excellent!
static int qca_setup(struct hci_uart *hu)
{
...
qcadev = serdev_device_get_drvdata(hu->serdev);
/* Patch downloading has to be done without IBS mode */
clear_bit(STATE_IN_BAND_SLEEP_ENABLED, &qca->flags);
/* Setup initial baudrate */
speed = qca_get_speed(hu, QCA_INIT_SPEED);
if (speed)
qca_set_speed(hu, speed, QCA_INIT_SPEED);
I said earlier that a _set_speed() followed by a _get_speed() is a bit
odd, and that it would be better to get the speed first and pass it as
a parameter. After looking again over the larger code I'm not
convinced anymore this is such a good idea, since the above pattern is
repeated multiple times, when it could be just:
qca_set_speed(hu, QCA_INIT_SPEED)
(+ error handling, which is also missing in the code above)
Just a thought, not asking you to change it back, do whatever seems
best to you.
if (qcadev->btsoc_type == QCA_WCN3990) {
bt_dev_dbg(hdev, "setting up wcn3990");
hci_uart_set_flow_control(hu, true);
ret = qca_send_vendor_cmd(hdev,
QCA_WCN3990_POWERON_PULSE);
if (ret) {
bt_dev_err(hdev, "failed to send power on
command");
return ret;
}
serdev_device_close(hu->serdev);
ret = serdev_device_open(hu->serdev);
if (ret) {
bt_dev_err(hdev, "failed to open port");
return ret;
}
msleep(100);
speed = qca_get_speed(hu, QCA_INIT_SPEED);
if (speed)
qca_set_speed(hu, speed, QCA_INIT_SPEED);
hci_uart_set_flow_control(hu, false);
} else {
bt_dev_info(hdev, "ROME setup");
/* Setup user speed if needed */
speed = qca_get_speed(hu, QCA_OPER_SPEED);
if (speed) {
ret = qca_set_speed(hu, speed,
QCA_OPER_SPEED);
if (ret)
return ret;
qca_baudrate = qca_get_baudrate_value(speed);
It seems setting 'qca_baudrate' could also be done in the common
path. Would require an extra qca_get_speed(hu, QCA_OPER_SPEED) call,
in exchange this would be done in a single place closer to where
'qca_baudrate' is actually used.
Actually as it is now 'qca_baudrate' could remain uninitialized for
Rome if no operating speed is defined, which judging from
qca_get_baudrate_value() should result in QCA_BAUDRATE_115200.
}
}
ret = qca_read_soc_version(hdev, &soc_ver);
if (ret < 0 || soc_ver == 0) {
bt_dev_err(hdev, "Failed to get version %d", ret);
return ret;
}
bt_dev_info(hdev, "wcn3990 controller version 0x%08x",
soc_ver);
if (qcadev->btsoc_type == QCA_WCN3990) {
hci_uart_set_flow_control(hu, true);
/* Setup user speed if needed */
speed = qca_get_speed(hu, QCA_OPER_SPEED);
if (speed) {
ret = qca_set_speed(hu, speed,
QCA_OPER_SPEED);
if (ret)
return ret;
qca_baudrate = qca_get_baudrate_value(speed);
}
/* Setup patch / NVM configurations */
ret = qca_uart_setup(hdev, qca_baudrate, qcadev->btsoc_type,
soc_ver);
if (!ret) {
set_bit(STATE_IN_BAND_SLEEP_ENABLED, &qca->flags);
qca_debugfs_init(hdev);
} else if (ret == -ENOENT) {
/* No patch/nvm-config found, run with original
fw/config */
ret = 0;
} else if (ret == -EAGAIN) {
/*
...
}
Overall looks good and should still become a bit more compact if the
handling of flow control is done in _set_speed() as you suggested in
"[PATCH v7 8/8] Bluetooth: hci_qca: Add support for Qualcomm Bluetooth
chip wcn3990"
[Bala}: to over come calling qca_get_speed() for qca_baudrate.
i prefer passing qca_baudrate as pointer argument to
qca_set_speed().
that will actually helps to lower function calls. intern
increase the speed of execution too.
code snippet after integrating wcn3990:
static int qca_set_speed(struct hci_uart *hu, unsigned int
*qca_baudrate,
enum qca_speed_type speed_type)
{
struct qca_serdev *qcadev;
unsigned int speed;
int ret;
if (speed_type == QCA_INIT_SPEED) {
speed = qca_get_speed(hu, QCA_INIT_SPEED);
if (speed) {
host_set_baudrate(hu, speed);
*qca_baudrate = qca_get_baudrate_value(speed);
} else {
bt_dev_err(hu->hdev, "Init speed should be non
zero");
}
return 0;
}
speed = qca_get_speed(hu, QCA_OPER_SPEED);
if (!speed) {
bt_dev_err(hu->hdev, "operating speed should be non
zero");
return 0;
}
qcadev = serdev_device_get_drvdata(hu->serdev);
/* Disabling hardware flow control is preferred while
* sending change baud rate command to SoC.
*/
if (qcadev->btsoc_type == QCA_WCN3990)
hci_uart_set_flow_control(hu, true);
*qca_baudrate = qca_get_baudrate_value(speed);
bt_dev_info(hu->hdev, "Set UART speed to %d", speed);
ret = qca_set_baudrate(hu->hdev, *qca_baudrate);
if (ret) {
bt_dev_err(hu->hdev, "Failed to change the baudrate
(%d)", ret);
return ret;
}
host_set_baudrate(hu, speed);
if (qcadev->btsoc_type == QCA_WCN3990)
hci_uart_set_flow_control(hu, false);
return 0;
}
static int qca_setup(struct hci_uart *hu)
{
....
qcadev = serdev_device_get_drvdata(hu->serdev);
/* Patch downloading has to be done without IBS mode */
clear_bit(STATE_IN_BAND_SLEEP_ENABLED, &qca->flags);
/* Setup initial baudrate */
qca_set_speed(hu, &qca_baudrate, QCA_INIT_SPEED);
if (qcadev->btsoc_type == QCA_WCN3990) {
bt_dev_dbg(hdev, "setting up wcn3990");
hci_uart_set_flow_control(hu, true);
ret = qca_send_vendor_cmd(hdev,
QCA_WCN3990_POWERON_PULSE);
if (ret)
return ret;
serdev_device_close(hu->serdev);
ret = serdev_device_open(hu->serdev);
if (ret) {
bt_dev_err(hdev, "failed to open port");
return ret;
}
msleep(100);
/* Setup initial baudrate */
qca_set_speed(hu, &qca_baudrate, QCA_INIT_SPEED);
hci_uart_set_flow_control(hu, false);
ret = qca_read_soc_version(hdev, &soc_ver);
if (ret < 0 || soc_ver == 0) {
bt_dev_err(hdev, "Failed to get version %d",
ret);
return ret;
}
bt_dev_info(hdev, "wcn3990 controller version 0x%08x",
soc_ver);
} else {
bt_dev_info(hdev, "ROME setup");
}
/* Setup user speed if needed */
ret = qca_set_speed(hu, &qca_baudrate, QCA_OPER_SPEED);
if (ret)
return ret;
/* Setup patch / NVM configurations */
ret = qca_uart_setup(hdev, qca_baudrate, qcadev->btsoc_type,
soc_ver);
if (!ret) {
set_bit(STATE_IN_BAND_SLEEP_ENABLED, &qca->flags);
qca_debugfs_init(hdev);
} else if (ret == -ENOENT) {
/* No patch/nvm-config found, run with original
fw/config */
ret = 0;
} else if (ret == -EAGAIN) {
/*
* Userspace firmware loader will return -EAGAIN in case
no
* patch/nvm-config is found, so run with original
fw/config.
*/
ret = 0;
}
/* Setup bdaddr */
hu->hdev->set_bdaddr = qca_set_bdaddr_rome;
return ret;
}
--
Regards
Balakrishna.
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