linux-kernel - Re: [RFC 0/2] Add workaround for core wake-up on IPI for i.MX8MQ

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Date:   Fri, 8 Nov 2019 11:50:03 +0000
From:   Abel Vesa <abel.vesa@....com>
To:     Martin Kepplinger <martink@...teo.de>
CC:     Leonard Crestez <leonard.crestez@....com>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Shawn Guo <shawnguo@...nel.org>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        Fabio Estevam <festevam@...il.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Marc Zyngier <marc.zyngier@....com>,
        Lucas Stach <l.stach@...gutronix.de>,
        Jacky Bai <ping.bai@....com>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        Carlo Caione <ccaione@...libre.com>,
        dl-linux-imx <linux-imx@....com>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [RFC 0/2] Add workaround for core wake-up on IPI for i.MX8MQ

On 19-11-08 12:21:21, Martin Kepplinger wrote:

> Hi Leonard, hi Abel,
> 
> Thanks for having a look! To sum up this problem and not to get confused:
> 
> We have the workaround that changes irq-imx-gpcv2 from this very email
> thread, to be used with mainline ATF. when applying Abel's recent diff,
> Linux 5.4 boots but I still don't have a cpuidle driver.
> 
> When I enable CONFIG_ARM_PSCI_CPUIDLE, the kernel hangs during boot
> (after probing mmc, but that doesn't tell much)
> 
> What do I miss?
> 

OK, please fetch the branches called "imx8mq-err11171" from both following github repos and give it a try:

https://github.com/abelvesa/linux.git

and

https://github.com/abelvesa/arm-trusted-firmware.git

I just tested it. Works with defconfig.

> 
> Then (in parallel) we have NXP's ATF:
> https://eur01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fsource.codeaurora.org%2Fexternal%2Fimx%2Fimx-atf%2Flog%2F%3Fh%3Dimx_4.19.35_1.0.0&amp;data=02%7C01%7Cabel.vesa%40nxp.com%7C0a5a09f616c84932e06d08d7643dccaf%7C686ea1d3bc2b4c6fa92cd99c5c301635%7C0%7C0%7C637088088896134121&amp;sdata=tq0aUGawG%2FhRRXZB9jdIi2xSNGHINhbWM1ZpDKPFrqU%3D&amp;reserved=0
> that I test in parallel (and will actually want to have cpuidle right
> now too). The workaround in Linux in that case looks like so:
> https://eur01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fsource.codeaurora.org%2Fexternal%2Fimx%2Flinux-imx%2Fcommit%2F%3Fh%3Dimx_4.19.35_1.0.0%26id%3D26a59057f88997dfe48ab7f81898ddd6b6d3903e&amp;data=02%7C01%7Cabel.vesa%40nxp.com%7C0a5a09f616c84932e06d08d7643dccaf%7C686ea1d3bc2b4c6fa92cd99c5c301635%7C0%7C0%7C637088088896134121&amp;sdata=GqmtzpS8fB4bxmOXxTNQZrWNCV18lNu7XpX5dmcAEaY%3D&amp;reserved=0
> which changes irq-gic-v3 only.
> 

Forget about the NXP arm-trusted-firmware for now. It will never work with mainline + the workaround patches.

> Since 5.4, also no cpu-sleep state anymore. What would need to change in
> that "NXP" case, for 5.4 to have cpuidle again?
> 
> When I enable ARM_PSCI_CPUIDLE here, right now Linux hangs during boot
> (during probing sdhci but again that seems random).
> 
> I'm still happy for hints :)
> 
> Thanks,
> 
>                               martin
>