linux-kernel - [PATCH] arm64: dts: rockchip: slow down emmc freq for rock 5 itx

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Message-ID: <20250228143341.70244-1-liujianfeng1994@gmail.com>
Date: Fri, 28 Feb 2025 22:33:08 +0800
From: Jianfeng Liu <liujianfeng1994@...il.com>
To: linux-rockchip@...ts.infradead.org
Cc: Jianfeng Liu <liujianfeng1994@...il.com>,
	Conor Dooley <conor+dt@...nel.org>,
	Heiko Stuebner <heiko@...ech.de>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Rob Herring <robh@...nel.org>,
	Stephen Rothwell <sfr@...b.auug.org.au>,
	devicetree@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH] arm64: dts: rockchip: slow down emmc freq for rock 5 itx

The current max-frequency 200000000 of emmc is not stable. When doing
heavy write there will be I/O Error. After setting max-frequency to
150000000 the emmc is stable under write.

Also remove property mmc-hs200-1_8v because we are already running at
HS400 mode.

Tested with fio command:
fio -filename=./test_randread -direct=1 -iodepth 1 -thread \
-rw=randwrite -ioengine=psync -bs=16k -size=1G -numjobs=10 \
-runtime=600 -group_reporting -name=mytest

Signed-off-by: Jianfeng Liu <liujianfeng1994@...il.com>
---

 arch/arm64/boot/dts/rockchip/rk3588-rock-5-itx.dts | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/arch/arm64/boot/dts/rockchip/rk3588-rock-5-itx.dts b/arch/arm64/boot/dts/rockchip/rk3588-rock-5-itx.dts
index 253b23ea9fba..bcefe5356936 100644
--- a/arch/arm64/boot/dts/rockchip/rk3588-rock-5-itx.dts
+++ b/arch/arm64/boot/dts/rockchip/rk3588-rock-5-itx.dts
@@ -724,10 +724,9 @@ &saradc {
 
 &sdhci {
 	bus-width = <8>;
-	max-frequency = <200000000>;
+	max-frequency = <150000000>;
 	mmc-hs400-1_8v;
 	mmc-hs400-enhanced-strobe;
-	mmc-hs200-1_8v;
 	no-sdio;
 	no-sd;
 	non-removable;
-- 
2.43.0