[PATCH v2 1/3] wifi: ath12k: configure RDDM size to MHI for device recovery

[Wen Gong]

On 8/3/2023 7:32 PM, Kalle Valo wrote:
> Wen Gong <quic_wgong at quicinc.com> writes:
>
>> On 8/3/2023 5:24 PM, Kalle Valo wrote:
>>> Wen Gong <quic_wgong at quicinc.com> wrote:
>>>
>>>> RDDM is RAM DUMP DEBUG module, it is used to debug issues when firmware
>>>> encounters an error.
>>>>
>>>> The rddm_size is needed by firmware while MHI enter RDDM state. Add it
>>>> to support device recovery when ath12k receive MHI_CB_EE_RDDM message.
>>>>
>>>> Tested-on: WCN7850 hw2.0 PCI
>>>> WLAN.HMT.1.0-03427-QCAHMTSWPL_V1.0_V2.0_SILICONZ-1.15378.4
>>>>
>>>> Signed-off-by: Wen Gong <quic_wgong at quicinc.com>
>>>> Signed-off-by: Kalle Valo <quic_kvalo at quicinc.com>
>>> I'm not sure what "support device recovery" means exactly. How does this patch
>>> change functionality from user's point of view?
>>>
>>> No need to resend because of this, I can add that to the commit log.
>> Device recovery means SSR(subsystem restart), when firmware happen
>> crash, ath12k
>> will receive the RDDM event, and then ath12k/mac80211 begin to
>> re-start wifi/firmware,
>> after that, the wifi become normal again.
>>
>> This patch is to let firmware report RDDM event correctly to ath12k.
>> Without this patch,
>> firmware will not report RDDM event to ath12k correctly, then ath12k
>> will not begin SSR
>> process.
>>
>> I think it should be changed like this:
>>
>> The rddm_size is needed by firmware while MHI enter RDDM state. Add it
>> and then firmware will report MHI_CB_EE_RDDM correctly while firmware
>> encounters an error, then ath12k could start the device recovery process.
> How about this:
>
> "RDDM is Ram Dump Debug Module which is used to debug issues when the
> firmware encounters an error. The rddm_size is needed by the firmware
> while MHI goes to the RDDM state. Provide the size to MHI subsystem so
> that the firmware restart works when the firmware crashes."

Thanks.

Yes, it is OK for me.