From: Xiaolei Wang xiaolei.wang@windriver.com
[ Upstream commit be18293e47cbca7c6acee9231fc851601d69563a ]
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 mmc0: 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/imx7s.dtsi#L1216-L1217
Fixes: 1e336aa0c025 ("mmc: sdhci-esdhc-imx: correct the tuning start tap and step setting") Signed-off-by: Xiaolei Wang xiaolei.wang@windriver.com Reviewed-by: Fabio Estevam festevam@gmail.com Signed-off-by: Shawn Guo shawnguo@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org --- arch/arm/boot/dts/imx7s.dtsi | 6 ++++++ 1 file changed, 6 insertions(+)
diff --git a/arch/arm/boot/dts/imx7s.dtsi b/arch/arm/boot/dts/imx7s.dtsi index 54026c2c93fac..6ffb428dc939c 100644 --- a/arch/arm/boot/dts/imx7s.dtsi +++ b/arch/arm/boot/dts/imx7s.dtsi @@ -1184,6 +1184,8 @@ <&clks IMX7D_USDHC1_ROOT_CLK>; clock-names = "ipg", "ahb", "per"; bus-width = <4>; + fsl,tuning-step = <2>; + fsl,tuning-start-tap = <20>; status = "disabled"; };
@@ -1196,6 +1198,8 @@ <&clks IMX7D_USDHC2_ROOT_CLK>; clock-names = "ipg", "ahb", "per"; bus-width = <4>; + fsl,tuning-step = <2>; + fsl,tuning-start-tap = <20>; status = "disabled"; };
@@ -1208,6 +1212,8 @@ <&clks IMX7D_USDHC3_ROOT_CLK>; clock-names = "ipg", "ahb", "per"; bus-width = <4>; + fsl,tuning-step = <2>; + fsl,tuning-start-tap = <20>; status = "disabled"; };