From 9e179ea19c78123a8a67355b36a2c55b2bb7bf04 Mon Sep 17 00:00:00 2001
From: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
Date: Sun, 11 Jul 2021 23:40:23 +0200
Subject: [PATCH] ARM: dts: meson8: Use a higher default GPU clock frequency
Git-commit: 44cf630bcb8c5ec78125805c9447dd5766792224
Patch-mainline: v5.15-rc1
References: stable-5.14.4
[ Upstream commit 44cf630bcb8c5ec78125805c9447dd5766792224 ]
We are seeing "imprecise external abort (0x1406)" errors during boot
(which then cause the whole board to hang) on Meson8 (but not Meson8m2).
These are observed while trying to access the GPU's registers when the
MALI clock is running at it's default setting of 24MHz. The 3.10 vendor
kernel uses 318.75MHz as "default" GPU frequency. Using that makes the
"imprecise external aborts" go away.
Add the assigned-clocks and assigned-clock-rates properties to also bump
the MALI clock to 318.75MHz before accessing any of it's registers.
Fixes: 7d3f6b536e72c9 ("ARM: dts: meson8: add the Mali-450 MP6 GPU")
Reported-by: Demetris Ierokipides <ierokipides.dem@gmail.com>
Signed-off-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
Reviewed-by: Neil Armstrong <narmstrong@baylibre.com>
Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
Link: https://lore.kernel.org/r/20210711214023.2163565-1-martin.blumenstingl@googlemail.com
Signed-off-by: Sasha Levin <sashal@kernel.org>
Acked-by: Takashi Iwai <tiwai@suse.de>
---
arch/arm/boot/dts/meson8.dtsi | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/arch/arm/boot/dts/meson8.dtsi b/arch/arm/boot/dts/meson8.dtsi
index 157a950a55d3..686c7b7c79d5 100644
--- a/arch/arm/boot/dts/meson8.dtsi
+++ b/arch/arm/boot/dts/meson8.dtsi
@@ -304,8 +304,13 @@ mali: gpu@c0000 {
"pp2", "ppmmu2", "pp4", "ppmmu4",
"pp5", "ppmmu5", "pp6", "ppmmu6";
resets = <&reset RESET_MALI>;
+
clocks = <&clkc CLKID_CLK81>, <&clkc CLKID_MALI>;
clock-names = "bus", "core";
+
+ assigned-clocks = <&clkc CLKID_MALI>;
+ assigned-clock-rates = <318750000>;
+
operating-points-v2 = <&gpu_opp_table>;
#cooling-cells = <2>; /* min followed by max */
};
--
2.26.2