linux-kernel - Re: [RFC PATCH 2/2] PM / devfreq: rk3399

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Message-ID: <CAD=FV=Wdp5ax_MhGg-=ocSPS=cs1nUCRcz+E81Z2V-w_YVuzUw@mail.gmail.com>
Date:   Tue, 5 Apr 2022 19:26:28 -0700
From:   Doug Anderson <dianders@...omium.org>
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>,
        Heiko Stuebner <heiko@...ech.de>,
        LKML <linux-kernel@...r.kernel.org>,
        Elaine Zhang <zhangqing@...k-chips.com>,
        Linux PM <linux-pm@...r.kernel.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        "open list:ARM/Rockchip SoC..." <linux-rockchip@...ts.infradead.org>
Subject: Re: [RFC PATCH 2/2] PM / devfreq: rk3399_dmc: Block PMU during transitions

Hi,

On Tue, Apr 5, 2022 at 6:49 PM Brian Norris <briannorris@...omium.org> wrote:
>
> See the previous patch ("soc: rockchip: power-domain: Manage resource
> conflicts with firmware") for a thorough explanation of the conflicts.
> While ARM Trusted Firmware may be modifying memory controller and
> power-domain states, we need to block the kernel's power-domain driver.
>
> If the power-domain driver is disabled, there is no resource conflict
> and this becomes a no-op.
>
> Signed-off-by: Brian Norris <briannorris@...omium.org>
> ---
>
>  drivers/devfreq/rk3399_dmc.c | 13 +++++++++++++
>  1 file changed, 13 insertions(+)

Reviewed-by: Douglas Anderson <dianders@...omium.org>