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Subject[PATCH v6 0/6] Bug fixes for Qualcomm BT chip wcn3990
Date
The below issues are found in the recent testing.

1. Observed device is not going into off state or not responding.
As wcn3990 require a power pulses to turn on the irrespctive of
igniting regulators, it was observed that power on or power off
pulses are not in sync with respective to chip.
The below patch will help us to wait until byte is pushed on to wires.

* Bluetooth: hci_qca: use wait_until_sent() for power pulses

2. Observed Chip responding when we are in sleep.
This is due to turn on flow control during change baudrate request.
The below patch will only pull the RTS line high instead of turning off
the flow.

* Bluetooth: hci_qca: Pull RTS line high for baudrate change command.

3. Frame reassembly errors splashing on console.
wcn3990 requires will use multiple baudrates during booting stage.
i.e. 2400 bps while sending power off pulse
115200 bps while sending power on pulse
port close
port open
set baudrate to 115200 request the chip version.

during above process, we are seeing some stray bytes coming up
on the UART Rx FIFO it could be due to frequent baudrate change.

This patch will stop the frame reassembly errors.

* Bluetooth: hci_qca: Fix frame reassembly errors for wcn3990

4. Disable IBS state machine and flush Tx buffer
We are disabling IBS and flushing the Tx buffer before turning off the chip.

This is due to IBS state machine is active when we turn off the chip.
This will stop queuing IBS protocol bytes.

* Bluetooth: hci_qca: Disable IBS state machine and flush Tx buffer

5. hci_qca: Update baudrate change wait time for wcn3990

This patch will help to decrease the BT on time by 200ms.
we updated the baudrate change wait time to 100ms instead of 300ms.

6. btqca: inject command complete event during fw download

Qualcomm latest chip will not send an command complete event
for last packet of the fw dump sent, so here we are inject an command
complete event.

* Bluetooth: btqca: inject command complete event during fw download

Changes in v6:
* added serdev_device_write_flush in qca_send_power_pulse().
* added new patch to update the baudrate change wait time.

Changes in V5:
* added serdev_device_write_flush before sending the power off pulse
during shutdown.

Changes in v4:
* used serdev_device_write_buf() instead of serdev_device_write().
* added new patch to stop logging of 0xfc00 timeout on console.

Changes in v3:
* moved IBS & qca_flush to different patch
* updated comments in code fo Deassert RTS patch

Balakrishna Godavarthi (6):
Bluetooth: hci_qca: use wait_until_sent() for power pulses
Bluetooth: hci_qca: Deassert RTS while baudrate change command
Bluetooth: hci_qca: Fix frame reassembly errors for wcn3990
Bluetooth: hci_qca: Disable IBS state machine and flush Tx buffer
Bluetooth: hci_qca: Update baudrate change wait time for wcn3990
Bluetooth: btqca: inject command complete event during fw download

drivers/bluetooth/btqca.c | 39 +++++++++++++++-
drivers/bluetooth/btqca.h | 3 ++
drivers/bluetooth/hci_qca.c | 88 ++++++++++++++++++++++---------------
3 files changed, 94 insertions(+), 36 deletions(-)

--
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project

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