linux-kernel - Re: [PATCH v5 04/13] remoteproc: qcom: q6v5: Use qmp

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Date:   Mon, 23 Aug 2021 15:17:08 -0500
From:   Stephen Boyd <swboyd@...omium.org>
To:     Sibi Sankar <sibis@...eaurora.org>, bjorn.andersson@...aro.org,
        mka@...omium.org, robh+dt@...nel.org
Cc:     ulf.hansson@...aro.org, rjw@...ysocki.net, agross@...nel.org,
        ohad@...ery.com, mathieu.poirier@...aro.org,
        linux-arm-msm@...r.kernel.org, linux-remoteproc@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        dianders@...omium.org, rishabhb@...eaurora.org,
        sidgup@...eaurora.org
Subject: Re: [PATCH v5 04/13] remoteproc: qcom: q6v5: Use qmp_send to update
 co-processor load state

Quoting Sibi Sankar (2021-08-18 20:02:07)
> The power domains exposed by the AOSS QMP driver control the load state
> resources linked to modem, adsp, cdsp remoteprocs. These are used to
> notify the Always on Subsystem (AOSS) that a particular co-processor is
> up/down. AOSS uses this information to wait for the co-processors to
> suspend before starting its sleep sequence.
>
> These co-processors enter low-power modes independent to that of the
> application processor and the load state resources linked to them are
> expected to remain unaltered across system suspend/resume cycles. To
> achieve this behavior lets stop using the power-domains exposed by the
> AOSS QMP node and replace them with generic qmp_send interface instead.
>
> Signed-off-by: Sibi Sankar <sibis@...eaurora.org>
> ---

Reviewed-by: Stephen Boyd <swboyd@...omium.org>