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charset="utf-8" If the tuning step is not set, the tuning step is set to 1. For some sd cards, the following Tuning timeout will occur. Tuning failed, falling back to fixed sampling clock So set the default tuning step. This refers to the NXP vendor's commit below: https://github.com/nxp-imx/linux-imx/blob/lf-6.1.y/ arch/arm/boot/dts/imx6sx.dtsi#L1108-L1109 Fixes: 1e336aa0c025 ("mmc: sdhci-esdhc-imx: correct the tuning start tap an= d step setting") Signed-off-by: Xiaolei Wang Reviewed-by: Fabio Estevam --- arch/arm/boot/dts/nxp/imx/imx6sx.dtsi | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/arch/arm/boot/dts/nxp/imx/imx6sx.dtsi b/arch/arm/boot/dts/nxp/= imx/imx6sx.dtsi index 3a4308666552..5bed7b411a3a 100644 --- a/arch/arm/boot/dts/nxp/imx/imx6sx.dtsi +++ b/arch/arm/boot/dts/nxp/imx/imx6sx.dtsi @@ -1010,6 +1010,8 @@ usdhc1: mmc@2190000 { <&clks IMX6SX_CLK_USDHC1>; clock-names =3D "ipg", "ahb", "per"; bus-width =3D <4>; + fsl,tuning-start-tap =3D <20>; + fsl,tuning-step=3D <2>; status =3D "disabled"; }; =20 @@ -1022,6 +1024,8 @@ usdhc2: mmc@2194000 { <&clks IMX6SX_CLK_USDHC2>; clock-names =3D "ipg", "ahb", "per"; bus-width =3D <4>; + fsl,tuning-start-tap =3D <20>; + fsl,tuning-step=3D <2>; status =3D "disabled"; }; =20 @@ -1034,6 +1038,8 @@ usdhc3: mmc@2198000 { <&clks IMX6SX_CLK_USDHC3>; clock-names =3D "ipg", "ahb", "per"; bus-width =3D <4>; + fsl,tuning-start-tap =3D <20>; + fsl,tuning-step=3D <2>; status =3D "disabled"; }; =20 --=20 2.25.1