linux-kernel - Re: [PATCH v2 1/3] ARM: dts: rockchip: disable GPU 500 MHz OPP for veyron

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Message-ID: <CAD=FV=WxhL3FLYWvOoys3GOB68WVKinfgjTVK5byyzyTzVsyBw@mail.gmail.com>
Date:   Mon, 20 May 2019 16:24:21 -0700
From:   Doug Anderson <dianders@...omium.org>
To:     Matthias Kaehlcke <mka@...omium.org>
Cc:     Heiko Stuebner <heiko@...ech.de>, Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        "open list:ARM/Rockchip SoC..." <linux-rockchip@...ts.infradead.org>,
        devicetree@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 1/3] ARM: dts: rockchip: disable GPU 500 MHz OPP for veyron

Hi,

On Mon, May 20, 2019 at 3:01 PM Matthias Kaehlcke <mka@...omium.org> wrote:
>
> The NPLL is the only safe way to generate 500 MHz for the GPU. The
> downstream Chrome OS 3.14 kernel ('official' kernel for veyron
> devices) re-purposes NPLL to HDMI and hence disables the OPP for
> the GPU (see https://crrev.com/c/1574579). Disable it here as well
> to keep in sync and avoid problems in case someone decides to
> re-purpose NPLL.
>
> Signed-off-by: Matthias Kaehlcke <mka@...omium.org>
> ---
> Changes in v2:
> - patch added to the series
> ---
>  arch/arm/boot/dts/rk3288-veyron.dtsi | 8 ++++++++
>  1 file changed, 8 insertions(+)

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