linux-kernel - Re: [PATCH v1 0/1] Enable subsystem restart for Qualcomm bluetooth chip wcn3990.

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Date:   Mon, 09 Jul 2018 22:27:18 +0530
From:   Balakrishna Godavarthi <bgodavar@...eaurora.org>
To:     marcel@...tmann.org, johan.hedberg@...il.com, mka@...omium.org
Cc:     linux-kernel@...r.kernel.org, linux-bluetooth@...r.kernel.org,
        rtatiya@...eaurora.org, hemantg@...eaurora.org,
        c-hbandi@...eaurora.org, linux-arm-msm@...r.kernel.org
Subject: Re: [PATCH v1 0/1] Enable subsystem restart for Qualcomm bluetooth
 chip wcn3990.

Forgot to add this patch is on top of
Following patches. Which are under review

https://patchwork.kernel.org/patch/10510029/
https://patchwork.kernel.org/patch/10510031/
https://patchwork.kernel.org/patch/10510037/
https://patchwork.kernel.org/patch/10510045/
https://patchwork.kernel.org/patch/10510033/
https://patchwork.kernel.org/patch/10510051/
https://patchwork.kernel.org/patch/10510047/

On 2018-07-09 21:46, Balakrishna Godavarthi wrote:
> In many platforms Bluetooth chip wcn3990 is a discrete chip connected
> via UART lines to app processor. if the chip goes into bad state
> i.e. into hard fault exception routine, which will not further respond
> to any commands from HOST via UART. In that case wcn3390 will intimate
> HOST by generating hardware error. Host stack will initiate a close
> and reopen of the hci driver. Prior to sending hard ware error, wcn3990
> has a capability of sending the RAM dump i.e. memory dump of the BT 
> chip.
> this will help us to fix stability issues of the SoC. We at QCA driver
> read the dump packets and store via devcoredump().
> We perform restart after collecting the ram dump of the SoC.
> 
> 
> Harish Bandi (1):
>   Bluetooth: hci_qca: Sub system restart support for WCN3990
> 
>  drivers/bluetooth/btqca.h   |   8 ++
>  drivers/bluetooth/hci_qca.c | 261 ++++++++++++++++++++++++++++++++++++
>  2 files changed, 269 insertions(+)

-- 
Regards
Balakrishna.