enoch/armbian-build
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

rockchip-current: Add GPU 500MHZ OPP

Browse Source 
Those were removed from mainline kernels by Chromebook devs,
wanting to protect their broken babies at all cost.

This patch was dully tested here :
https://forum.armbian.com/topic/13515-panfrost-on-rk3288-and-gpu-on-600mhz-problems/

But you're welcome to test it again !

I did it, with a whole glmark2 round and it worked flawlessly.

To test the GPU at that frequency, locate the **devfreq** folder of your GPU unit on your system (For tinkerboards, it's in **/sys/devices/platform/ffa30000.gpu/devfreq/ffa30000.gpu**) and then :

* Check the available frequencies by doing `sudo cat available_frequencies` .
That should output something like this : `100000000 200000000 300000000 400000000 500000000 600000000`
Be sure that `500000000` is in the list.

* Setup the minimum GPU frequency to 500Mhz like this : `sudo echo 500000000 > min_freq`

You can also set up the GPU to not go over 500Mhz like this : `sudo echo 500000000 > max_freq`

Signed-off-by: Miouyouyou (Myy) <myy@miouyouyou.fr>
This commit is contained in:
Miouyouyou (Myy) 2020-08-15 22:43:27 +02:00
parent c27379e93f
commit 71920e0e56
No known key found for this signature in database
GPG Key ID: 0E2BB0769DB137BE
1 changed files with 42 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

42
patch/kernel/rockchip-current/1026-arm-dtsi-rk3288-add-GPU-500-Mhz-OPP.patch Normal file
View File

@ -0,0 +1,42 @@
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