linux-kernel - Re: [PATCH] arm64: dts: meson: Add capacity-dmips-mhz attributes to G12B

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Message-ID: <7htv915x4i.fsf@baylibre.com>
Date:   Tue, 24 Sep 2019 12:10:05 -0700
From:   Kevin Hilman <khilman@...libre.com>
To:     Christian Hewitt <christianshewitt@...il.com>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-amlogic@...ts.infradead.org, linux-kernel@...r.kernel.org
Cc:     Frank Hartung <supervisedthinking@...il.com>,
        Christian Hewitt <christianshewitt@...il.com>
Subject: Re: [PATCH] arm64: dts: meson: Add capacity-dmips-mhz attributes to G12B

Christian Hewitt <christianshewitt@...il.com> writes:

> From: Frank Hartung <supervisedthinking@...il.com>
>
> From: Frank Hartung <supervisedthinking@...il.com>

nit: duplicate From line.  Removed when applying.

> Meson G12B SoCs (S922X and A311D) are a big-little design where not all CPUs
> are equal; the A53s cores are weaker than the A72s.
>
> Include capacity-dmips-mhz properties to tell the OS there is a difference
> in processing capacity. The dmips values are based on similar submissions for
> other A53/A72 SoCs: HiSilicon 3660 [1] and Rockchip RK3399 [2].
>
> This change is particularly beneficial for use-cases like retro gaming where
> emulators often run on a single core. The OS now chooses an A72 core instead
> of an A53 core.
>
> [1] https://lore.kernel.org/patchwork/patch/862742/
> [2] https://patchwork.kernel.org/patch/10836577/
>
> Signed-off-by: Frank Hartung <supervisedthinking@...il.com>
> Signed-off-by: Christian Hewitt <christianshewitt@...il.com>

Queued for v5.5,

Thanks!

Kevin