linux-kernel - Re: [PATCH v2 2/2] irqchip: Add Qualcomm MPM controller driver

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Date:   Tue, 30 Nov 2021 16:44:46 +0800
From:   Shawn Guo <shawn.guo@...aro.org>
To:     Maulik Shah <quic_mkshah@...cinc.com>
Cc:     Marc Zyngier <maz@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Loic Poulain <loic.poulain@...aro.org>,
        devicetree@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 2/2] irqchip: Add Qualcomm MPM controller driver

On Tue, Nov 30, 2021 at 01:56:02PM +0530, Maulik Shah wrote:
> Hi,
> 
> On 11/29/2021 7:15 PM, Shawn Guo wrote:
> > > This is not limited to suspend, you will need to notify RPM during deepest
> > > cpu idle state entry as well, since MPM may be monitoring interrupts in that
> > > case too.
> > Yeah, I was trying to test this MPM driver with cpuidle, but failed to
> > see the SoC get into vlow/vmin state from cpuidle.
> 
> In a few cases SoC can enter vmin/vlow from cpuidle one is from static
> screen on.
> 
> > Do you have any
> > suggestion how I should test it properly?
> Suspend resume (use "s2idle" and not "deep" mode on upstream kernel) is one
> good method, but you will have to make sure all drivers have removed votes
> on xo clock when entering suspend.
> Also need to make sure other subsystem like modem is in power collaspe (look
> at the internal master stats driver to know if other subsystems entering to
> low power mode or not).

I have already been able to trigger a vmin sleep with s2idle by doing:

 $ echo mem > /sys/power/state

My question is how I can get a vmin sleep in idle case, so that MPM
driver can be tested in both suspend and idle context.

Shawn