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Date:   Mon, 18 Feb 2019 11:50:51 +0100
From:   Marcel Holtmann <>
To:     Balakrishna Godavarthi <>
Cc:     Johan Hedberg <>,,,,,
Subject: Re: [PATCH v11 0/3] Bug fixes for Qualcomm BT chip wcn3990

Hi Balakrishna,

> The below issues are found in our 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. 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
> Changes in v11:
> * added correct signatures for the patch.
> Changes in v10:
> * Decreased wait time for power pulse to 100 ms instead of 1second.
> * enabling the flow control back when baudarte change request fails.
> * updated review comments.
> Changes in v9:
> * Reverted the 100us delay and used msecs to jiffies inline call.
> * Disabling the flow control and enabling it back while setting the firmware.
> * Added spinlock while clearing the IBS state machine.
> Changes in v8:
> * dropped inject the command complete event.
> * added one second time for the power pules instead of the indefinite time.
> Changes in v7:
> * dropped frame reassmebly error patch.
> * dropped baudrate change wait time patch.
> * increased a wait to 5 ms for power pulses.
> 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 (3):
>  Bluetooth: hci_qca: use wait_until_sent() for power pulses
>  Bluetooth: hci_qca: Deassert RTS while baudrate change command
>  Bluetooth: hci_qca: Disable IBS state machine and flush Tx buffer
> drivers/bluetooth/hci_qca.c | 82 ++++++++++++++++++++-----------------
> 1 file changed, 44 insertions(+), 38 deletions(-)

all 3 patches have been applied to bluetooth-next tree.



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