| Message ID | 20191227072130.29431-1-rjliao@codeaurora.org |
|---|---|
| State | Superseded |
| Headers | show |
| Series | [v3,1/4] Bluetooth: hci_qca: Add QCA Rome power off support to the qca_power_off() | expand |
Hi Rocky, On Fri, Dec 27, 2019 at 03:21:28PM +0800, Rocky Liao wrote: > This patch adds the retry of btsoc initialization when it fails. There are > reports that the btsoc initialization may fail on some platforms but the > repro ratio is very low. The failure may be caused by UART, platform HW or > the btsoc itself but it's very difficlut to root cause, given the repro > ratio is very low. Add a retry for the btsoc initialization will resolve > most of the failures and make Bluetooth finally works. Is this problem specific to a certain chipset? What are the symptoms? > Signed-off-by: Rocky Liao <rjliao@codeaurora.org> > --- > > Changes in v2: None > Changes in v3: None > > drivers/bluetooth/hci_qca.c | 26 ++++++++++++++++++++++++++ > 1 file changed, 26 insertions(+) > > diff --git a/drivers/bluetooth/hci_qca.c b/drivers/bluetooth/hci_qca.c > index 43fd84028786..45042aa27fa4 100644 > --- a/drivers/bluetooth/hci_qca.c > +++ b/drivers/bluetooth/hci_qca.c > @@ -53,6 +53,9 @@ > /* Controller debug log header */ > #define QCA_DEBUG_HANDLE 0x2EDC > > +/* max retry count when init fails */ > +#define QCA_MAX_INIT_RETRY_COUNT 3 nit: MAX_RETRIES or MAX_INIT_RETRIES? The QCA prefix just adds noise here IMO, there's no need to disambiguate the constant from other retries since it is defined in hci_qca.c. > + > enum qca_flags { > QCA_IBS_ENABLED, > QCA_DROP_VENDOR_EVENT, > @@ -1257,7 +1260,9 @@ 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; > + unsigned int init_retry_count = 0; nit: the name is a bit clunky, how about 'retries'? > enum qca_btsoc_type soc_type = qca_soc_type(hu); > const char *firmware_name = qca_get_firmware_name(hu); > int ret; > @@ -1275,6 +1280,7 @@ static int qca_setup(struct hci_uart *hu) > */ > set_bit(HCI_QUIRK_SIMULTANEOUS_DISCOVERY, &hdev->quirks); > > +retry: > if (qca_is_wcn399x(soc_type)) { > bt_dev_info(hdev, "setting up wcn3990"); > > @@ -1293,6 +1299,12 @@ static int qca_setup(struct hci_uart *hu) > return ret; > } else { > bt_dev_info(hdev, "ROME setup"); > + if (hu->serdev) { > + qcadev = serdev_device_get_drvdata(hu->serdev); > + gpiod_set_value_cansleep(qcadev->bt_en, 1); > + /* Controller needs time to bootup. */ > + msleep(150); Shouldn't this be in qca_power_on(), analogous to the power off code from "[1/4]Bluetooth: hci_qca: Add QCA Rome power off support to the qca_power_off()"? qca_power_on() should then also be called for ROME. If you opt for this it should be done in a separate patch, or possibly merged into the one mentioned above. > + } > qca_set_speed(hu, QCA_INIT_SPEED); > } > > @@ -1329,6 +1341,20 @@ static int qca_setup(struct hci_uart *hu) > * patch/nvm-config is found, so run with original fw/config. > */ > ret = 0; > + } else { > + if (init_retry_count < QCA_MAX_INIT_RETRY_COUNT) { > + qca_power_off(hdev); > + if (hu->serdev) { > + serdev_device_close(hu->serdev); > + ret = serdev_device_open(hu->serdev); > + if (ret) { > + bt_dev_err(hu->hdev, "open port fail"); nit: "failed to open port"
On Fri, Jan 03, 2020 at 02:31:46PM +0800, rjliao@codeaurora.org wrote: > 在 2020-01-03 02:41，Matthias Kaehlcke 写道： > > > Hi Rocky, > > > > On Fri, Dec 27, 2019 at 03:21:28PM +0800, Rocky Liao wrote: > > > > > This patch adds the retry of btsoc initialization when it fails. > > > There are > > > reports that the btsoc initialization may fail on some platforms but > > > the > > > repro ratio is very low. The failure may be caused by UART, platform > > > HW or > > > the btsoc itself but it's very difficlut to root cause, given the > > > repro > > > ratio is very low. Add a retry for the btsoc initialization will > > > resolve > > > most of the failures and make Bluetooth finally works. > > > > Is this problem specific to a certain chipset? > > > > What are the symptoms? > > It's reported on Rome so far but I think the patch is potentially helpful > for > wcn399x as well. > > The symptoms is the firmware downloading failed due to the UART write timed > out. Working around this with retries seems ok for now if the repro rate is really low, but it shouldn't necessarily be interpreted as "the problem is fixed". Please mention the symptoms in the commit message for documentation, then the retries can potentially be removed in the futures when the root cause is fixed. > > > enum qca_btsoc_type soc_type = qca_soc_type(hu); > > > const char *firmware_name = qca_get_firmware_name(hu); > > > int ret; > > > @@ -1275,6 +1280,7 @@ static int qca_setup(struct hci_uart *hu) > > > */ > > > set_bit(HCI_QUIRK_SIMULTANEOUS_DISCOVERY, &hdev->quirks); > > > > > > +retry: > > > if (qca_is_wcn399x(soc_type)) { > > > bt_dev_info(hdev, "setting up wcn3990"); > > > > > > @@ -1293,6 +1299,12 @@ static int qca_setup(struct hci_uart *hu) > > > return ret; > > > } else { > > > bt_dev_info(hdev, "ROME setup"); > > > + if (hu->serdev) { > > > + qcadev = serdev_device_get_drvdata(hu->serdev); > > > + gpiod_set_value_cansleep(qcadev->bt_en, 1); > > > + /* Controller needs time to bootup. */ > > > + msleep(150); > > > > Shouldn't this be in qca_power_on(), analogous to the power off code > > from > > "[1/4]Bluetooth: hci_qca: Add QCA Rome power off support to the > > qca_power_off()"? > > > > qca_power_on() should then also be called for ROME. If you opt for this > > it > > should be done in a separate patch, or possibly merged into the one > > mentioned above. > > > > There is no qca_power_on() func and wcn399x is calling qca_wcn3990_init() to > do power on, I prefer to not do this change this time. I would say it's precisely the right time to add this function. Patch 1 of this series adds handling of the BT_EN GPIO to qca_power_off(), now this patch duplicates the code of the BT_EN handling in qca_open(). > If it's needed 'needed' is a relative term. It certainly isn't needed from a purely functional POV. However it is desirable for encapsulation and to avoid code duplication. > it should be a new patch to add qca_power_on() which supports both Rome and wcn399x. Agreed m.
diff --git a/drivers/bluetooth/hci_qca.c b/drivers/bluetooth/hci_qca.c index b602ed01505b..43fd84028786 100644 --- a/drivers/bluetooth/hci_qca.c +++ b/drivers/bluetooth/hci_qca.c @@ -1413,13 +1413,26 @@ static void qca_power_shutdown(struct hci_uart *hu) static int qca_power_off(struct hci_dev *hdev) { struct hci_uart *hu = hci_get_drvdata(hdev); + struct qca_serdev *qcadev; + enum qca_btsoc_type soc_type = qca_soc_type(hu); + + if (qca_is_wcn399x(soc_type)) { + /* Perform pre shutdown command */ + qca_send_pre_shutdown_cmd(hdev); + + usleep_range(8000, 10000); - /* Perform pre shutdown command */ - qca_send_pre_shutdown_cmd(hdev); + qca_power_shutdown(hu); + } else { + if (hu->serdev) { + qcadev = serdev_device_get_drvdata(hu->serdev); + + gpiod_set_value_cansleep(qcadev->bt_en, 0); - usleep_range(8000, 10000); + usleep_range(8000, 10000); + } + } - qca_power_shutdown(hu); return 0; }
We will need to call the qca_power_off() API to power off Rome, add the support into it. QCA Rome is using bt_en GPIO for power off, so we just need to pull down this bt_en GPIO to power off it. Signed-off-by: Rocky Liao <rjliao@codeaurora.org> --- Changes in v2: None Changes in v3: None drivers/bluetooth/hci_qca.c | 21 +++++++++++++++++---- 1 file changed, 17 insertions(+), 4 deletions(-)