linux-kernel - Re: [PATCH v2 7/9] arm64: dts: qcom: msm8998: Add PSCI cpuidle low power states

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Message-ID: <20191002092734.GA15523@centauri>
Date:   Wed, 2 Oct 2019 11:27:34 +0200
From:   Niklas Cassel <niklas.cassel@...aro.org>
To:     Jeffrey Hugo <jeffrey.l.hugo@...il.com>
Cc:     Amit Kucheria <amit.kucheria@...aro.org>,
        lkml <linux-kernel@...r.kernel.org>,
        MSM <linux-arm-msm@...r.kernel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Andy Gross <agross@...nel.org>,
        Marc Gonzalez <marc.w.gonzalez@...e.fr>,
        Sibi Sankar <sibis@...eaurora.org>, daniel.lezcano@...aro.org,
        David Brown <david.brown@...aro.org>,
        Li Yang <leoyang.li@....com>, Shawn Guo <shawnguo@...nel.org>,
        DTML <devicetree@...r.kernel.org>
Subject: Re: [PATCH v2 7/9] arm64: dts: qcom: msm8998: Add PSCI cpuidle low
 power states

On Wed, Oct 02, 2019 at 11:19:50AM +0200, Niklas Cassel wrote:
> On Mon, Sep 30, 2019 at 04:20:15PM -0600, Jeffrey Hugo wrote:
> > Amit, the merged version of the below change causes a boot failure
> > (nasty hang, sometimes with RCU stalls) on the msm8998 laptops.  Oddly
> > enough, it seems to be resolved if I remove the cpu-idle-states
> > property from one of the cpu nodes.
> > 
> > I see no issues with the msm8998 MTP.
> 
> Hello Jeffrey, Amit,
> 
> If the PSCI idle states work properly on the msm8998 devboard (MTP),
> but causes crashes on msm8998 laptops, the only logical change is
> that the PSCI firmware is different between the two devices.

Since the msm8998 laptops boot using ACPI, perhaps these laptops
doesn't support PSCI/have any PSCI firmware at all.


Kind regards,
Niklas