[PATCH v2 0/3] Bug fixes for Qualcomm BT chip wcn3990

[Balakrishna Godavarthi]

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


Changes in v2:
 * Removed Bluetooth: hci_qca: clear HCI_QUIRK_RESET_ON_CLOSE flag patch
   will be sending as separate series.

Balakrishna Godavarthi (3):
  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

 drivers/bluetooth/hci_qca.c | 76 ++++++++++++++++++++-----------------
 1 file changed, 42 insertions(+), 34 deletions(-)

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