linux-kernel - Re: [PATCH v5 09/11] remoteproc: qcom: Add Hexagon based multipd rproc driver

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Date:   Wed, 8 Nov 2023 16:10:57 +0530
From:   Manikanta Mylavarapu <quic_mmanikan@...cinc.com>
To:     <agross@...nel.org>, <andersson@...nel.org>,
        <konrad.dybcio@...aro.org>, <mathieu.poirier@...aro.org>,
        <robh+dt@...nel.org>, <krzysztof.kozlowski+dt@...aro.org>,
        <conor+dt@...nel.org>, <mturquette@...libre.com>,
        <sboyd@...nel.org>, <quic_eberman@...cinc.com>,
        <quic_gurus@...cinc.com>, <kvalo@...nel.org>,
        <loic.poulain@...aro.org>, <linux-arm-msm@...r.kernel.org>,
        <linux-remoteproc@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <linux-clk@...r.kernel.org>
CC:     <quic_srichara@...cinc.com>, <quic_sjaganat@...cinc.com>,
        <quic_kathirav@...cinc.com>, <quic_anusha@...cinc.com>,
        <quic_varada@...cinc.com>
Subject: Re: [PATCH v5 09/11] remoteproc: qcom: Add Hexagon based multipd
 rproc driver



On 8/2/2023 7:36 PM, Manikanta Mylavarapu wrote:
> It adds support to bring up remoteproc's on multipd model.
> Pd means protection domain. It's similar to process in Linux.
> Here QDSP6 processor runs each wifi radio functionality on a
> separate process. One process can't access other process
> resources, so this is termed as PD i.e protection domain.
> 
> Here we have two pd's called root and user pd. We can correlate
> Root pd as root and user pd as user in linux. Root pd has more
> privileges than user pd. Root will provide services to user pd.
> 
>  From remoteproc driver perspective, root pd corresponds to QDSP6
> processor bring up and user pd corresponds to Wifi radio (WCSS)
> bring up.
> 
> Here WCSS(user) PD is dependent on Q6(root) PD, so first
> q6 pd should be up before wcss pd. After wcss pd goes down,
> q6 pd should be turned off.
> 

Thanks Krzysztof, Kalle, Rob, Bjorn for all your reviews.
I have addressed them in this series.
Can you please suggest and help me to take this forward ?

Thanks & Regards,
Manikanta.