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

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Message-ID: <CA+ASDXP46bVqZAyzgUQkZAqqVf6Yc5Zg9CZ_1k0XCYUSYq_QLg@mail.gmail.com>
Date:   Tue, 5 Apr 2022 19:05:33 -0700
From:   Brian Norris <briannorris@...omium.org>
To:     Peter Geis <pgwipeout@...il.com>
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

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.

Regards,
Brian