linux-kernel - [PATCH] dt: rockchip: rk3399: Add dynamic power coefficient for GPU

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Message-Id: <20210319110511.24787-1-daniel.lezcano@linaro.org>
Date:   Fri, 19 Mar 2021 12:05:09 +0100
From:   Daniel Lezcano <daniel.lezcano@...aro.org>
To:     heiko@...ech.de
Cc:     Rob Herring <robh+dt@...nel.org>, Johan Jonker <jbx6244@...il.com>,
        Helen Koike <helen.koike@...labora.com>,
        Shunqian Zheng <zhengsq@...k-chips.com>,
        Jacob Chen <jacob2.chen@...k-chips.com>,
        Chen-Yu Tsai <wens@...e.org>,
        Markus Reichl <m.reichl@...etechno.de>,
        Robin Murphy <robin.murphy@....com>,
        Boris Brezillon <boris.brezillon@...labora.com>,
        devicetree@...r.kernel.org (open list:OPEN FIRMWARE AND FLATTENED
        DEVICE TREE BINDINGS),
        linux-arm-kernel@...ts.infradead.org (moderated list:ARM/Rockchip SoC
        support),
        linux-rockchip@...ts.infradead.org (open list:ARM/Rockchip SoC support),
        linux-kernel@...r.kernel.org (open list)
Subject: [PATCH] dt: rockchip: rk3399: Add dynamic power coefficient for GPU

The DTPM framework is looking for upstream SoC candidates to share the
power numbers.

We can see around different numbers but the one which seems to be
consistent with the initial post for the values on the CPUs can be
found in the patch https://lore.kernel.org/patchwork/patch/810159/

I don't know the precision of this value but it is better than
nothing.

Hopefully, one day SoC vendors will be more generous with the power
numbers at least for the SoC which are from the previous generation
and give the community the opportunity to develop power based
frameworks.
---
 arch/arm64/boot/dts/rockchip/rk3399.dtsi | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/arm64/boot/dts/rockchip/rk3399.dtsi b/arch/arm64/boot/dts/rockchip/rk3399.dtsi
index edbbf35fe19e..1ab1d293d2e9 100644
--- a/arch/arm64/boot/dts/rockchip/rk3399.dtsi
+++ b/arch/arm64/boot/dts/rockchip/rk3399.dtsi
@@ -1933,6 +1933,7 @@
 		interrupt-names = "job", "mmu", "gpu";
 		clocks = <&cru ACLK_GPU>;
 		#cooling-cells = <2>;
+		dynamic-power-coefficient = <977>;
 		power-domains = <&power RK3399_PD_GPU>;
 		status = "disabled";
 	};
-- 
2.17.1