linux-kernel - Re: [PATCH v2 12/15] arm64: dts: rockchip: Enable dmc and dfi nodes on gru

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Message-ID: <CAMdYzYqvjin-S0mKFZJ5pwe4yNhG9ZH77-VMNpnL3W2HSQ6gNQ@mail.gmail.com>
Date:   Wed, 6 Apr 2022 20:18:26 -0400
From:   Peter Geis <pgwipeout@...il.com>
To:     Brian Norris <briannorris@...omium.org>
Cc:     MyungJoo Ham <myungjoo.ham@...sung.com>,
        Kyungmin Park <kyungmin.park@...sung.com>,
        Chanwoo Choi <cw00.choi@...sung.com>,
        Rob Herring <robh+dt@...nel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        "open list:ARM/Rockchip SoC..." <linux-rockchip@...ts.infradead.org>,
        Lin Huang <hl@...k-chips.com>,
        arm-mail-list <linux-arm-kernel@...ts.infradead.org>,
        Derek Basehore <dbasehore@...omium.org>,
        devicetree <devicetree@...r.kernel.org>,
        linux-pm <linux-pm@...r.kernel.org>,
        Heiko Stuebner <heiko@...ech.de>,
        Enric Balletbo i Serra <enric.balletbo@...labora.com>,
        Gaël PORTAY <gael.portay@...labora.com>,
        Daniel Lezcano <daniel.lezcano@...aro.org>
Subject: Re: [PATCH v2 12/15] arm64: dts: rockchip: Enable dmc and dfi nodes
 on gru

On Tue, Apr 5, 2022 at 10:05 PM Brian Norris <briannorris@...omium.org> wrote:
>
> Hello again Peter,
>
> On Fri, Mar 4, 2022 at 6:47 AM Peter Geis <pgwipeout@...il.com> wrote:
> > Transitions anywhere from the default 800mhz cause a lock.
> >
> > I'm digging deeper, but I'm hoping you can answer some questions in
> > the meantime:
> > 1. Does this require something from firmware that isn't available on
> > Mainline ATF? (AKA special firmware to the Chromebook line)
> > 2. If not, do you have any recommendations off the top of your head?
>
> I may have a better answer for you now. In the intervening time
> period, I've discovered a potentially-relevant bug, involving
> interactions between the kernel power-domain driver and ATF. See this
> series for my current fixes:
>
> https://lore.kernel.org/linux-rockchip/20220406014842.2771799-1-briannorris@chromium.org/
> [RFC PATCH 0/2] rockchip / devfreq: Coordinate DRAM controller
> resources between ATF and kernel
>
> If that happens to help you (it may help, for instance, if your system
> was toggling NPLL off/on like mine was; it also may help if you're
> hitting a race on PMU_BUS_IDLE_REQ like noticed in patch 1), I'd love
> your feedback there.
>
> It's still possible your problems are completely unrelated though.

Thank you, that is certainly possible to be the problem here as well.
I won't have time to test them till this weekend, but you can count on
my feedback as soon as I get the time to do so.

>
> Regards,
> Brian