linux-kernel - Re: [RFC v1 0/1] drm: lima: devfreq and cooling device support

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Message-ID: <CAFBinCD+k8O90ePuwSEnW1+oh-xJ9oUC5P2WrHgLLBb0RHj+=Q@mail.gmail.com>
Date:   Tue, 24 Dec 2019 12:22:09 +0100
From:   Martin Blumenstingl <martin.blumenstingl@...glemail.com>
To:     Qiang Yu <yuq825@...il.com>
Cc:     dri-devel <dri-devel@...ts.freedesktop.org>,
        lima@...ts.freedesktop.org, David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Tomeu Vizoso <tomeu.vizoso@...labora.com>,
        Rob Herring <robh@...nel.org>,
        Steven Price <steven.price@....com>,
        Alyssa Rosenzweig <alyssa.rosenzweig@...labora.com>,
        "open list:ARM/Amlogic Meson..." <linux-amlogic@...ts.infradead.org>,
        linux-rockchip@...ts.infradead.org, Chen-Yu Tsai <wens@...e.org>
Subject: Re: [RFC v1 0/1] drm: lima: devfreq and cooling device support

On Mon, Dec 16, 2019 at 3:51 AM Qiang Yu <yuq825@...il.com> wrote:
[...]
> For the code, I think you may need some lock to protect the time records as
> there are two kernel threads gp/pp will try to mark GPU busy and several
> interrupts try to mark GPU idle.
good catch, thank you for this!
I assume the reason is that the panfrost GPUs are using a "unified"
architecture, while the ones supported by lima don't

I'll add locking so I don't run into trouble.


Thank you!
Martin