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Date:   Tue, 24 Dec 2019 19:35:36 +0800
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Subject: Re: [Lima] [RFC v1 0/1] drm: lima: devfreq and cooling device support
To:     lima@lists.freedesktop.org,
        Martin Blumenstingl <martin.blumenstingl@googlemail.com>,
        Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>
CC:     robh@kernel.org, tomeu.vizoso@collabora.com, airlied@linux.ie,
        linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org,
        steven.price@arm.com, linux-rockchip@lists.infradead.org,
        wens@csie.org, yuq825@gmail.com, daniel@ffwll.ch,
        linux-amlogic@lists.infradead.org
From:   Icenowy Zheng <icenowy@aosc.io>
Message-ID: <54FE8BA3-BB70-4411-9FD9-4AE460097A95@aosc.io>
Sender: linux-kernel-owner@vger.kernel.org
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于 2019年12月24日 GMT+08:00 下午7:28:41, Martin Blumenstingl <martin.blumenstingl@googlemail.com> 写到:
>Hi Alyssa,
>
>On Mon, Dec 16, 2019 at 4:48 PM Alyssa Rosenzweig
><alyssa.rosenzweig@collabora.com> wrote:
>>
>> If so much code is being duplicated over, I'm wondering if it makes
>> sense for us to move some of the common devfreq code to core DRM
>> helpers?
>if you have any recommendation where to put it then please let me know
>(I am not familiar with the DRM subsystem at all)
>
>my initial idea was that the devfreq logic needs the same information
>that the scheduler needs (whether we're submitting something to be
>executed, there was a timeout, ...).
>however, looking at drivers/gpu/drm/scheduler/ this seems pretty
>stand-alone so I'm not sure it should go there
>also the Mali-4x0 GPUs have some "PMU" which *may* be used instead of

It's optional. We cannot promise its existance on a given
hardware, and I heard that at least on Allwinner H5 Mali PMU
is broken.

>polling the statistics internally
>so this is where I realize that with my current knowledge I don't know
>enough about lima, panfrost, DRM or the devfreq subsystem to get a
>good idea where to put the code.
>
>
>Martin
>_______________________________________________
>lima mailing list
>lima@lists.freedesktop.org
>https://lists.freedesktop.org/mailman/listinfo/lima

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