linux-kernel - Re: [RFCv1 0/8] RK3399 clean shutdown issue

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Date:   Sat, 07 Dec 2019 12:45:13 +0100
From:   Heiko Stuebner <heiko@...ech.de>
To:     Anand Moon <linux.amoon@...il.com>
Cc:     Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Jagan Teki <jagan@...rulasolutions.com>,
        Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>,
        Robin Murphy <robin.murphy@....com>,
        Daniel Schultz <d.schultz@...tec.de>,
        devicetree <devicetree@...r.kernel.org>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        linux-rockchip@...ts.infradead.org,
        Linux Kernel <linux-kernel@...r.kernel.org>
Subject: Re: [RFCv1 0/8] RK3399 clean shutdown issue

Am Samstag, 7. Dezember 2019, 06:07:49 CET schrieb Anand Moon:
> Hi Heiko,
> 
> On Sat, 7 Dec 2019 at 04:02, Heiko Stuebner <heiko@...ech.de> wrote:
> >
> > Hi Anand,
> >
> > Am Freitag, 6. Dezember 2019, 19:45:28 CET schrieb Anand Moon:
> > > Most of the RK3399 SBC boards do not perform clean
> > > shutdown and clean reboot.
> > >
> > > These patches try to help resolve the issue with proper
> > > shutdown by turning off the PMIC.
> > >
> > > For reference
> > > RK805 PMCI data sheet:
> > > [0] http://rockchip.fr/RK805%20datasheet%20V1.3.pdf
> > > RK808 PMIC data sheet:
> > > [1] http://rockchip.fr/RK808%20datasheet%20V1.4.pdf
> > > RK817 PMIC data sheet:
> > > [2] http://rockchip.fr/RK817%20datasheet%20V1.01.pdf
> > > RK818 PMIC data sheet:
> > > [3] http://rockchip.fr/RK818%20datasheet%20V1.0.pdf
> > >
> > > Reboot issue:
> > > My guess is that we need to some proper sequence of
> > > setting to PMCI to perform clean.
> > >
> > > If you have any input please share them.
> >
> > The rk8xx pmics may not on all devices be responsible for powering down
> > the device. That is what the system-power-controller dt-property is for.
> >
> > So that property is there for a reason - to indicate that the pmic is
> > responsible for power-off-handling.
> >
> > Heiko
> >
> 
> Ok, my intent was to have common framework for
> shutdown, restart, suspend, resume routines.

That is a great goal actually :-)

I guess just keep in mind that it should only handle power-off
if instructed by the devicetree property.