devicetree.vger.kernel.org archive mirror
 help / color / mirror / Atom feed
From: "Heiko Stübner" <heiko@sntech.de>
To: Peter Geis <pgwipeout@gmail.com>
Cc: Robin Murphy <robin.murphy@arm.com>,
	Anand Moon <linux.amoon@gmail.com>,
	Rob Herring <robh+dt@kernel.org>,
	Mark Rutland <mark.rutland@arm.com>,
	Jagan Teki <jagan@amarulasolutions.com>,
	Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>,
	Daniel Schultz <d.schultz@phytec.de>,
	devicetree@vger.kernel.org, linux-kernel@vger.kernel.org,
	linux-arm-kernel@lists.infradead.org,
	"open list:ARM/Rockchip SoC..."
	<linux-rockchip@lists.infradead.org>
Subject: Re: [RFCv1 0/8] RK3399 clean shutdown issue
Date: Mon, 09 Dec 2019 14:53:52 +0100	[thread overview]
Message-ID: <8087758.JvhXzBlCRf@diego> (raw)
In-Reply-To: <CAMdYzYoZY5gau=DGtPhk9CPV_WcyM4wjR9o+rPyaQfOzoy2Y=Q@mail.gmail.com>

Hi,

Am Montag, 9. Dezember 2019, 14:37:28 CET schrieb Peter Geis:
> On Mon, Dec 9, 2019 at 8:29 AM Robin Murphy <robin.murphy@arm.com> wrote:
> >
> > On 06/12/2019 6:45 pm, Anand Moon wrote:
> > > Most of the RK3399 SBC boards do not perform clean
> > > shutdown and clean reboot.
> >
> > FWIW reboot problems on RK3399 have been tracked down to issues in
> > upstream ATF, and are unrelated to the PMIC.
> >
> > > These patches try to help resolve the issue with proper
> > > shutdown by turning off the PMIC.
> >
> > As mentioned elsewhere[1], although this is what the BSP kernel seems to
> > do, and in practice it's unlikely to matter for the majority of devboard
> > users like you and me, I still feel a bit uncomfortable with this
> > solution for systems using ATF as in principle the secure world might
> > want to know about orderly shutdowns, and this effectively makes every
> > shutdown an unexpected power loss from secure software's point of view.
> >
> > Robin.
> 
> Since ATF is operating completely in volatile memory, and shouldn't be
> touching hardware once it passes off control to the kernel anyways,
> what is the harm of pulling the rug out from under it?

Secure-world doesn't end with ATF :-)

There can also be an instance of OP-TEE or another TEE on top and they
often actually do secure storage encrypted onto the hosts mass storage
(see kernel's optee module).


> If this idea is to prevent issues in the future, such as if ATF does
> gain the ability to preempt hardware control, then at that time ATF
> will need to be able to handle actually powering off devices using the
> same functionality.
> 
> But as we discussed previously, ATF doesn't have this capability, so
> in this case any board without a dedicated power-off gpio will be
> unable to power off at all.
> Also it seems that giving ATF this functionality, with the current
> state of ATF, would be cost prohibitive.
> 
> I personally feel that allowing the kernel to do this is a solution to
> the problem we have now.

For the rest I guess I'll just point to Robin's text and Ack under your
system-power-controller patch ;-)

Heiko


> > [1]
> > http://lists.infradead.org/pipermail/linux-rockchip/2019-December/028183.html
> >
> > > 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.
> > >
> > > Tested on SBC
> > > Rock960 Model A
> > > Odroid N1
> > > Rock64
> > >
> > > -Anand Moon
> > >
> > > Anand Moon (8):
> > >    mfd: rk808: Refactor shutdown functions
> > >    mfd: rk808: use syscore for RK805 PMIC shutdown
> > >    mfd: rk808: use syscore for RK808 PMIC shutdown
> > >    mfd: rk808: use syscore for RK818 PMIC shutdown
> > >    mfd: rk808: cleanup unused function pointer
> > >    mfd: rk808: use common syscore for all PMCI for clean shutdown
> > >    arm64: rockchip: drop unused field from rk8xx i2c node
> > >    arm: rockchip: drop unused field from rk8xx i2c node
> > >
> > >   arch/arm/boot/dts/rk3036-kylin.dts            |   1 -
> > >   arch/arm/boot/dts/rk3188-px3-evb.dts          |   1 -
> > >   arch/arm/boot/dts/rk3288-evb-rk808.dts        |   1 -
> > >   arch/arm/boot/dts/rk3288-phycore-som.dtsi     |   1 -
> > >   arch/arm/boot/dts/rk3288-popmetal.dts         |   1 -
> > >   arch/arm/boot/dts/rk3288-tinker.dtsi          |   1 -
> > >   arch/arm/boot/dts/rk3288-veyron.dtsi          |   1 -
> > >   arch/arm/boot/dts/rk3288-vyasa.dts            |   1 -
> > >   arch/arm/boot/dts/rv1108-elgin-r1.dts         |   1 -
> > >   arch/arm/boot/dts/rv1108-evb.dts              |   1 -
> > >   arch/arm64/boot/dts/rockchip/px30-evb.dts     |   1 -
> > >   arch/arm64/boot/dts/rockchip/rk3328-a1.dts    |   1 -
> > >   arch/arm64/boot/dts/rockchip/rk3328-evb.dts   |   1 -
> > >   .../arm64/boot/dts/rockchip/rk3328-roc-cc.dts |   1 -
> > >   .../arm64/boot/dts/rockchip/rk3328-rock64.dts |   1 -
> > >   .../boot/dts/rockchip/rk3368-geekbox.dts      |   1 -
> > >   arch/arm64/boot/dts/rockchip/rk3368-lion.dtsi |   1 -
> > >   .../boot/dts/rockchip/rk3368-px5-evb.dts      |   1 -
> > >   .../boot/dts/rockchip/rk3399-firefly.dts      |   1 -
> > >   .../boot/dts/rockchip/rk3399-hugsun-x99.dts   |   1 -
> > >   .../boot/dts/rockchip/rk3399-khadas-edge.dtsi |   1 -
> > >   .../boot/dts/rockchip/rk3399-leez-p710.dts    |   1 -
> > >   .../boot/dts/rockchip/rk3399-nanopi4.dtsi     |   1 -
> > >   .../boot/dts/rockchip/rk3399-orangepi.dts     |   1 -
> > >   arch/arm64/boot/dts/rockchip/rk3399-puma.dtsi |   1 -
> > >   .../boot/dts/rockchip/rk3399-roc-pc.dtsi      |   1 -
> > >   .../boot/dts/rockchip/rk3399-rock-pi-4.dts    |   1 -
> > >   .../boot/dts/rockchip/rk3399-rock960.dtsi     |   1 -
> > >   .../boot/dts/rockchip/rk3399-rockpro64.dts    |   1 -
> > >   .../boot/dts/rockchip/rk3399-sapphire.dtsi    |   1 -
> > >   drivers/mfd/rk808.c                           | 144 +++++-------------
> > >   include/linux/mfd/rk808.h                     |   2 -
> > >   32 files changed, 42 insertions(+), 134 deletions(-)
> > >
> >
> > _______________________________________________
> > Linux-rockchip mailing list
> > Linux-rockchip@lists.infradead.org
> > http://lists.infradead.org/mailman/listinfo/linux-rockchip
> 





  reply	other threads:[~2019-12-09 13:53 UTC|newest]

Thread overview: 21+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-12-06 18:45 [RFCv1 0/8] RK3399 clean shutdown issue Anand Moon
2019-12-06 18:45 ` [RFCv1 1/8] mfd: rk808: Refactor shutdown functions Anand Moon
2019-12-16 11:11   ` Lee Jones
2019-12-06 18:45 ` [RFCv1 2/8] mfd: rk808: use syscore for RK805 PMIC shutdown Anand Moon
2019-12-09 13:34   ` Robin Murphy
2019-12-09 15:38     ` Anand Moon
2019-12-06 18:45 ` [RFCv1 3/8] mfd: rk808: use syscore for RK808 " Anand Moon
2019-12-06 18:45 ` [RFCv1 4/8] mfd: rk808: use syscore for RK818 " Anand Moon
2019-12-06 18:45 ` [RFCv1 5/8] mfd: rk808: cleanup unused function pointer Anand Moon
2019-12-06 18:45 ` [RFCv1 6/8] mfd: rk808: use common syscore for all PMCI for clean shutdown Anand Moon
2019-12-06 18:45 ` [RFCv1 7/8] arm64: rockchip: drop unused field from rk8xx i2c node Anand Moon
2019-12-06 18:45 ` [RFCv1 8/8] arm: " Anand Moon
2019-12-06 22:32 ` [RFCv1 0/8] RK3399 clean shutdown issue Heiko Stuebner
2019-12-07  5:07   ` Anand Moon
2019-12-07 11:45     ` Heiko Stuebner
2019-12-09 13:29 ` Robin Murphy
2019-12-09 13:37   ` Peter Geis
2019-12-09 13:53     ` Heiko Stübner [this message]
2019-12-09 13:58     ` Robin Murphy
2019-12-09 14:51     ` Tobias Schramm
2019-12-09 14:56   ` Anand Moon

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=8087758.JvhXzBlCRf@diego \
    --to=heiko@sntech.de \
    --cc=d.schultz@phytec.de \
    --cc=devicetree@vger.kernel.org \
    --cc=jagan@amarulasolutions.com \
    --cc=linux-arm-kernel@lists.infradead.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=linux-rockchip@lists.infradead.org \
    --cc=linux.amoon@gmail.com \
    --cc=manivannan.sadhasivam@linaro.org \
    --cc=mark.rutland@arm.com \
    --cc=pgwipeout@gmail.com \
    --cc=robh+dt@kernel.org \
    --cc=robin.murphy@arm.com \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).