linux-kernel - Re: [PATCH v2 1/3] bus: mhi: core: Clear devices when moving execution environments

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Message-ID: <fb1246c0bbc2ebef6ef97f2645d3a741@codeaurora.org>
Date:   Thu, 04 Feb 2021 15:52:49 -0800
From:   Bhaumik Bhatt <bbhatt@...eaurora.org>
To:     Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
Cc:     linux-arm-msm@...r.kernel.org, hemantk@...eaurora.org,
        carl.yin@...ctel.com, naveen.kumar@...ctel.com,
        jhugo@...eaurora.org, linux-kernel@...r.kernel.org,
        loic.poulain@...aro.org
Subject: Re: [PATCH v2 1/3] bus: mhi: core: Clear devices when moving
 execution environments

Hi Mani,

On 2021-01-20 11:50 PM, Manivannan Sadhasivam wrote:
> On Thu, Jan 14, 2021 at 11:16:33AM -0800, Bhaumik Bhatt wrote:
>> When moving from SBL to mission mode execution environment, there
>> is no remove callback notification to MHI client drivers which
>> operate on SBL mode only. Client driver devices are being created
>> in SBL or AMSS(mission mode) and only destroyed after power down
>> or SYS_ERROR. If there exist any SBL-specific channels, those are
>> left open and client drivers are thus unaware of the new execution
>> environment where those channels cannot operate. Close the gap and
>> issue remove callbacks to SBL-specific client drivers once device
>> enters mission mode.
>> 
> 
> What are the SBL specific channels and the client drivers operating on 
> them?
> If this is something going to come in future, then this patch can come 
> later.
> 
> Thanks,
> Mani

Carl from Quectel (CC'd here) will need this patch as he works on EDL 
and Flash
Programmer changes which also needs usage of QSAHARA server over SBL.

Thanks,
Bhaumik
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