ARM: dts: imx: Set default tuning step for imx6sx usdhc

[ Upstream commit 0a2b96e42a0284c4fc03022236f656a085ca714a ]

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 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>

diff --git a/arch/arm/boot/dts/imx6sx.dtsi b/arch/arm/boot/dts/imx6sx.dtsi
index 4233943a1cca8687587c8e7afef046b78af06b03..fc0654e3fe950797bb61357db87e1167149f882d 100644 (file)
--- a/arch/arm/boot/dts/imx6sx.dtsi
+++ b/arch/arm/boot/dts/imx6sx.dtsi
@@ -980,6 +980,8 @@
                                         <&clks IMX6SX_CLK_USDHC1>;
                                clock-names = "ipg", "ahb", "per";
                                bus-width = <4>;
+                               fsl,tuning-start-tap = <20>;
+                               fsl,tuning-step= <2>;
                                status = "disabled";
                        };
 
@@ -992,6 +994,8 @@
                                         <&clks IMX6SX_CLK_USDHC2>;
                                clock-names = "ipg", "ahb", "per";
                                bus-width = <4>;
+                               fsl,tuning-start-tap = <20>;
+                               fsl,tuning-step= <2>;
                                status = "disabled";
                        };
 
@@ -1004,6 +1008,8 @@
                                         <&clks IMX6SX_CLK_USDHC3>;
                                clock-names = "ipg", "ahb", "per";
                                bus-width = <4>;
+                               fsl,tuning-start-tap = <20>;
+                               fsl,tuning-step= <2>;
                                status = "disabled";
                        };