linux-kernel - [PATCH] ARM: dts: imx: Set default tuning step for imx6sx usdhc

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Date:   Wed, 26 Jul 2023 15:57:47 +0800
From:   Xiaolei Wang <xiaolei.wang@...driver.com>
To:     robh+dt@...nel.org, krzysztof.kozlowski+dt@...aro.org,
        conor+dt@...nel.org, shawnguo@...nel.org, s.hauer@...gutronix.de,
        kernel@...gutronix.de, festevam@...il.com, linux-imx@....com,
        richardcochran@...il.com
Cc:     devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH] ARM: dts: imx: Set default tuning step for imx6sx usdhc

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@...driver.com>
---
 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@...0000 {
 					 <&clks IMX6SX_CLK_USDHC1>;
 				clock-names = "ipg", "ahb", "per";
 				bus-width = <4>;
+				fsl,tuning-start-tap = <20>;
+				fsl,tuning-step= <2>;
 				status = "disabled";
 			};
 
@@ -1022,6 +1024,8 @@ usdhc2: mmc@...4000 {
 					 <&clks IMX6SX_CLK_USDHC2>;
 				clock-names = "ipg", "ahb", "per";
 				bus-width = <4>;
+				fsl,tuning-start-tap = <20>;
+				fsl,tuning-step= <2>;
 				status = "disabled";
 			};
 
@@ -1034,6 +1038,8 @@ usdhc3: mmc@...8000 {
 					 <&clks IMX6SX_CLK_USDHC3>;
 				clock-names = "ipg", "ahb", "per";
 				bus-width = <4>;
+				fsl,tuning-start-tap = <20>;
+				fsl,tuning-step= <2>;
 				status = "disabled";
 			};
 
-- 
2.25.1