Get back 500Mhz freqs on Mali GPU when using RK3288 boards

0003-arm-dtsi-rk3288-add-GPU-500-Mhz-OPP-again.patch

From 73258d32daf3a661281bb5c77c5e2e06c7ff714e Mon Sep 17 00:00:00 2001
From: "Miouyouyou (Myy)" <myy@miouyouyou.fr>
Date: Fri, 3 Jul 2020 02:02:18 +0200
Subject: [PATCH] arm: dtsi: rk3288: add GPU 500 Mhz OPP again

Undoing the very bizarre mainline kernel patch,
75481833c6dbab4c29d15452f6b4337c16f5407b
which main purpose is to sync some 3.14 kernels hacks to
mainline kernels, for reasons that only matter for a few Chromebooks,
and shove it down the throat of every RK3288 user.

If you need to avoid the GPU going to 500 Mhz on Chromebooks,
remove the OPP entry inside the DTS that actually matters to RK3288
Chromebooks.

Meanwhile, the 600 Mhz operating point can prove to be unstable on
some RK3288 boards, while 500 Mhz works fine.
https://forum.armbian.com/topic/13515-panfrost-on-rk3288-and-gpu-on-600mhz-problems/

Signed-off-by: Miouyouyou (Myy) <myy@miouyouyou.fr>
---
 arch/arm/boot/dts/rk3288.dtsi | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/arch/arm/boot/dts/rk3288.dtsi b/arch/arm/boot/dts/rk3288.dtsi
index a66412547..ef7457f79 100644
--- a/arch/arm/boot/dts/rk3288.dtsi
+++ b/arch/arm/boot/dts/rk3288.dtsi
@@ -1312,6 +1312,10 @@ opp-400000000 {
                        opp-hz = /bits/ 64 <400000000>;
                        opp-microvolt = <1100000>;
                };
+               opp-500000000 {
+                       opp-hz = /bits/ 64 <500000000>;
+                       opp-microvolt = <1200000>;
+               };
                opp-600000000 {
                        opp-hz = /bits/ 64 <600000000>;
                        opp-microvolt = <1250000>;
-- 
2.27.0