linux-kernel - [PATCH 1/3] arm64: dts: imx93-9x9-qsb: change usdhc tuning step for eMMC and SD

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Message-Id: <20260128073532.2904161-1-ziniu.wang_1@nxp.com>
Date: Wed, 28 Jan 2026 15:35:30 +0800
From: ziniu.wang_1@....com
To: shawnguo@...nel.org,
	s.hauer@...gutronix.de,
	frank.li@....com,
	robh@...nel.org,
	krzk+dt@...nel.org,
	conor+dt@...nel.org
Cc: kernel@...gutronix.de,
	festevam@...il.com,
	devicetree@...r.kernel.org,
	imx@...ts.linux.dev,
	linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH 1/3] arm64: dts: imx93-9x9-qsb: change usdhc tuning step for eMMC and SD

From: Luke Wang <ziniu.wang_1@....com>

For eMMC and SD, there are two tuning pass windows and the gap between
those two windows may only have one cell. If tuning step > 1, the gap may
just be skipped and host assumes those two windows as a continuous
windows. This will cause a bad delay cell near the gap to be selected.

For SDIO, the gap is big enough, default tuning step is fine.

Signed-off-by: Luke Wang <ziniu.wang_1@....com>
---
 arch/arm64/boot/dts/freescale/imx93-9x9-qsb.dts | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/arch/arm64/boot/dts/freescale/imx93-9x9-qsb.dts b/arch/arm64/boot/dts/freescale/imx93-9x9-qsb.dts
index 0852067eab2c..197c8f8b7f66 100644
--- a/arch/arm64/boot/dts/freescale/imx93-9x9-qsb.dts
+++ b/arch/arm64/boot/dts/freescale/imx93-9x9-qsb.dts
@@ -507,6 +507,7 @@ &usdhc1 {
 	pinctrl-2 = <&pinctrl_usdhc1_200mhz>;
 	bus-width = <8>;
 	non-removable;
+	fsl,tuning-step = <1>;
 	status = "okay";
 };
 
@@ -519,6 +520,7 @@ &usdhc2 {
 	vmmc-supply = <&reg_usdhc2_vmmc>;
 	bus-width = <4>;
 	no-mmc;
+	fsl,tuning-step = <1>;
 	status = "okay";
 };
 
-- 
2.34.1