On 10/07/2025 18:09, Josua Mayer wrote:
LX2160 SoC uses a densely packed configuration area in memory for pin muxing - configuring a variable number of IOs at a time.
Since pinctrl nodes were added for the i2c signals of LX2160 SoC, boot errors have been observed on SolidRun LX2162A Clearfog board when rootfs is located on SD-Card (esdhc0):
[ 1.961035] mmc0: new ultra high speed SDR104 SDHC card at address aaaa ... [ 5.220655] i2c i2c-1: using pinctrl states for GPIO recovery [ 5.226425] i2c i2c-1: using generic GPIOs for recovery ... [ 5.440471] mmc0: card aaaa removed
The card-detect and write-protect signals of esdhc0 are an alternate function of IIC2 (in dts i2c1 - on lx2162 clearfog status disabled).
By use of u-boot "md", and linux "devmem" command it was confirmed that RCWSR12 (at 0x01e0012c) with IIC2_PMUX (at bits 0-2) changes from 0x08000006 to 0x0000000 after starting Linux.
compared values at 0x01e0012c (read-only) and 0x70010012c (dcfg).
This means that the card-detect pin function has changed to i2c function
- which will cause the controller to detect card removal.
The respective i2c1-scl-pins node is only linked to i2c1 node that has status disabled in device-tree for the solidrun boards. How the memory is changed has not been investigated.
RCWSR12 at 0x01e0012c is read-only and reflects the initial boot-time setting from RCW stage. The pinctrl-single driver uses dynamic configuration area at 0x70010012c to overide boot-time values.
We found that the dynamic configuration address reads 0 before first write, hence when applying the first configuration the original non-zero value is lost.
It might be worth reviewing and defining pinctrl for all alternate functions of each i2c controller.
As a workaround add a new pinctrl definition for the card-detect/write-protect function of IIC2 pins. It seems unwise to link this directly from the SoC dtsi as boards may rely on other functions such as flextimer.
Instead add the pinctrl to each board's esdhc0 node if it is known to rely on native card-detect function. These boards have esdhc0 node enabled and do not define broken-cd property:
- fsl-lx2160a-bluebox3.dts
- fsl-lx2160a-clearfog-itx.dtsi
- fsl-lx2160a-qds.dts
- fsl-lx2160a-rdb.dts
- fsl-lx2160a-tqmlx2160a-mblx2160a.dts
- fsl-lx2162a-clearfog.dts
- fsl-lx2162a-qds.dts
This was tested on the SolidRun LX2162 Clearfog with Linux v6.12.33.
Fixes: 8a1365c7bbc1 ("arm64: dts: lx2160a: add pinmux and i2c gpio to support bus recovery") Cc: stable@vger.kernel.org Signed-off-by: Josua Mayer josua@solid-run.com
arch/arm64/boot/dts/freescale/fsl-lx2160a-bluebox3.dts | 2 ++ arch/arm64/boot/dts/freescale/fsl-lx2160a-clearfog-itx.dtsi | 2 ++ arch/arm64/boot/dts/freescale/fsl-lx2160a-qds.dts | 2 ++ arch/arm64/boot/dts/freescale/fsl-lx2160a-rdb.dts | 2 ++ arch/arm64/boot/dts/freescale/fsl-lx2160a-tqmlx2160a-mblx2160a.dts | 2 ++ arch/arm64/boot/dts/freescale/fsl-lx2160a.dtsi | 4 ++++ arch/arm64/boot/dts/freescale/fsl-lx2162a-clearfog.dts | 2 ++ arch/arm64/boot/dts/freescale/fsl-lx2162a-qds.dts | 2 ++ 8 files changed, 18 insertions(+)
diff --git a/arch/arm64/boot/dts/freescale/fsl-lx2160a-bluebox3.dts b/arch/arm64/boot/dts/freescale/fsl-lx2160a-bluebox3.dts index 042c486bdda2..298fcdce6c6b 100644 --- a/arch/arm64/boot/dts/freescale/fsl-lx2160a-bluebox3.dts +++ b/arch/arm64/boot/dts/freescale/fsl-lx2160a-bluebox3.dts @@ -152,6 +152,8 @@ &esdhc0 { sd-uhs-sdr50; sd-uhs-sdr25; sd-uhs-sdr12;
- pinctrl-0 = <&i2c1_sdhc_cdwp>;
- pinctrl-names = "default"; status = "okay"; }; diff --git
a/arch/arm64/boot/dts/freescale/fsl-lx2160a-clearfog-itx.dtsi b/arch/arm64/boot/dts/freescale/fsl-lx2160a-clearfog-itx.dtsi index a7dcbecc1f41..67ffe2e1b0bc 100644 --- a/arch/arm64/boot/dts/freescale/fsl-lx2160a-clearfog-itx.dtsi +++ b/arch/arm64/boot/dts/freescale/fsl-lx2160a-clearfog-itx.dtsi @@ -93,6 +93,8 @@ &esdhc0 { sd-uhs-sdr50; sd-uhs-sdr25; sd-uhs-sdr12;
- pinctrl-0 = <&i2c1_sdhc_cdwp>;
- pinctrl-names = "default"; status = "okay"; }; diff --git a/arch/arm64/boot/dts/freescale/fsl-lx2160a-qds.dts
b/arch/arm64/boot/dts/freescale/fsl-lx2160a-qds.dts index 4d721197d837..17fe4a8fd35e 100644 --- a/arch/arm64/boot/dts/freescale/fsl-lx2160a-qds.dts +++ b/arch/arm64/boot/dts/freescale/fsl-lx2160a-qds.dts @@ -214,6 +214,8 @@ &emdio2 { }; &esdhc0 {
- pinctrl-0 = <&i2c1_sdhc_cdwp>;
- pinctrl-names = "default"; status = "okay"; }; diff --git a/arch/arm64/boot/dts/freescale/fsl-lx2160a-rdb.dts
b/arch/arm64/boot/dts/freescale/fsl-lx2160a-rdb.dts index 0c44b3cbef77..faa486d6a5b1 100644 --- a/arch/arm64/boot/dts/freescale/fsl-lx2160a-rdb.dts +++ b/arch/arm64/boot/dts/freescale/fsl-lx2160a-rdb.dts @@ -131,6 +131,8 @@ &esdhc0 { sd-uhs-sdr50; sd-uhs-sdr25; sd-uhs-sdr12;
- pinctrl-0 = <&i2c1_sdhc_cdwp>;
- pinctrl-names = "default"; status = "okay"; }; diff --git
a/arch/arm64/boot/dts/freescale/fsl-lx2160a-tqmlx2160a-mblx2160a.dts b/arch/arm64/boot/dts/freescale/fsl-lx2160a-tqmlx2160a-mblx2160a.dts index f6a4f8d54301..4ba55feb18b2 100644 --- a/arch/arm64/boot/dts/freescale/fsl-lx2160a-tqmlx2160a-mblx2160a.dts +++ b/arch/arm64/boot/dts/freescale/fsl-lx2160a-tqmlx2160a-mblx2160a.dts @@ -177,6 +177,8 @@ &esdhc0 { no-sdio; wp-gpios = <&gpio0 30 GPIO_ACTIVE_LOW>; cd-gpios = <&gpio0 31 GPIO_ACTIVE_LOW>;
- pinctrl-0 = <&i2c1_scl_gpio>;
- pinctrl-names = "default"; status = "okay"; }; diff --git a/arch/arm64/boot/dts/freescale/fsl-lx2160a.dtsi
b/arch/arm64/boot/dts/freescale/fsl-lx2160a.dtsi index c9541403bcd8..555a191b0bb4 100644 --- a/arch/arm64/boot/dts/freescale/fsl-lx2160a.dtsi +++ b/arch/arm64/boot/dts/freescale/fsl-lx2160a.dtsi @@ -1717,6 +1717,10 @@ i2c1_scl_gpio: i2c1-scl-gpio-pins { pinctrl-single,bits = <0x0 0x1 0x7>; };
i2c1_sdhc_cdwp: i2c1-esdhc0-cd-wp-pins {pinctrl-single,bits = <0x0 0x6 0x7>;};i2c2_scl: i2c2-scl-pins { pinctrl-single,bits = <0x0 0 (0x7 << 3)>; };diff --git a/arch/arm64/boot/dts/freescale/fsl-lx2162a-clearfog.dts b/arch/arm64/boot/dts/freescale/fsl-lx2162a-clearfog.dts index eafef8718a0f..4b58105c3ffa 100644 --- a/arch/arm64/boot/dts/freescale/fsl-lx2162a-clearfog.dts +++ b/arch/arm64/boot/dts/freescale/fsl-lx2162a-clearfog.dts @@ -227,6 +227,8 @@ &esdhc0 { sd-uhs-sdr50; sd-uhs-sdr25; sd-uhs-sdr12;
- pinctrl-0 = <&i2c1_sdhc_cdwp>;
- pinctrl-names = "default"; status = "okay"; }; diff --git a/arch/arm64/boot/dts/freescale/fsl-lx2162a-qds.dts
b/arch/arm64/boot/dts/freescale/fsl-lx2162a-qds.dts index 9f5ff1ffe7d5..caa079df35f6 100644 --- a/arch/arm64/boot/dts/freescale/fsl-lx2162a-qds.dts +++ b/arch/arm64/boot/dts/freescale/fsl-lx2162a-qds.dts @@ -238,6 +238,8 @@ &esdhc0 { sd-uhs-sdr50; sd-uhs-sdr25; sd-uhs-sdr12;
- pinctrl-0 = <&i2c1_sdhc_cdwp>;
- pinctrl-names = "default"; status = "okay"; };
base-commit: 19272b37aa4f83ca52bdf9c16d5d81bdd1354494 change-id: 20250710-lx2160-sd-cd-00bf38ae169e
Best regards,