Re: [PATCH v1] Bluetooth: hci_qca: Increase SSR delay for rampatch and NVM loading

[Dmitry Baryshkov]

On Fri, May 22, 2026 at 07:08:38PM +0800, Shuai Zhang wrote:
> When bt_en is pulled high by hardware, the host does not re-download
> the firmware after SSR. The controller loads the rampatch and NVM
> internally.
> 
> On HMT chip, due to the large firmware file size, the
> loading process takes approximately 70ms. The previous 50ms delay is
> too short, causing the controller to not respond to the reset command
> sent by the host, which leads to BT initialization failure.
> 
> Increase the delay to 100ms to ensure the controller has finished
> loading the firmware before the host sends commands.
> 
> Steps to reproduce:
> 1. Trigger SSR and wait for SSR to complete:
>    hcitool cmd 0x3f 0c 26
> 2. Run "bluetoothctl power on" and observe that BT fails to start.
> 
> Fixes: fce1a9244a0f ("Bluetooth: hci_qca: Fix SSR (SubSystem Restart) fail when BT_EN is pulled up by hw")
> Cc: stable@xxxxxxxxxxxxxxx
> Signed-off-by: Shuai Zhang <shuai.zhang@xxxxxxxxxxxxxxxx>
> ---
>  drivers/bluetooth/hci_qca.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 

Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@xxxxxxxxxxxxxxxx>


-- 
With best wishes
Dmitry