linux-kernel - Re: [PATCH 6/6] arm64: dts: imx8mm-kontron: Add support for reading SD

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Message-ID: <20230213161548.ucaqpza65byyqvfo@pengutronix.de>
Date:   Mon, 13 Feb 2023 17:15:48 +0100
From:   Marco Felsch <m.felsch@...gutronix.de>
To:     Frieder Schrempf <frieder@...s.de>
Cc:     devicetree@...r.kernel.org,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Rob Herring <robh+dt@...nel.org>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Shawn Guo <shawnguo@...nel.org>, Marek Vasut <marex@...x.de>,
        Frieder Schrempf <frieder.schrempf@...tron.de>,
        Oleksij Rempel <linux@...pel-privat.de>,
        Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        NXP Linux Team <linux-imx@....com>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        Heiko Thiery <heiko.thiery@...il.com>,
        Fabio Estevam <festevam@...il.com>
Subject: Re: [PATCH 6/6] arm64: dts: imx8mm-kontron: Add support for reading
 SD_VSEL signal

Hi Frieder,

thanks for the patch.

On 23-02-13, Frieder Schrempf wrote:
> From: Frieder Schrempf <frieder.schrempf@...tron.de>
> 
> This fixes the LDO5 regulator handling of the pca9450 driver by
> taking the status of the SD_VSEL into account to determine which
> configuration register is used for the voltage setting.
> 
> Even without this change there is no functional issue, as the code
> for switching the voltage in sdhci.c currently switches both, the
> VSELECT/SD_VSEL signal and the regulator voltage at the same time
> and doesn't run into an invalid corner case.
> 
> We should still make sure, that we always use the correct register
> when controlling the regulator. At least in U-Boot this fixes an
> actual bug where the wrong IO voltage is used.
> 
> Signed-off-by: Frieder Schrempf <frieder.schrempf@...tron.de>
> ---
>  arch/arm64/boot/dts/freescale/imx8mm-kontron-bl-osm-s.dts | 6 +++---
>  arch/arm64/boot/dts/freescale/imx8mm-kontron-bl.dts       | 6 +++---
>  arch/arm64/boot/dts/freescale/imx8mm-kontron-osm-s.dtsi   | 1 +
>  arch/arm64/boot/dts/freescale/imx8mm-kontron-sl.dtsi      | 1 +
>  4 files changed, 8 insertions(+), 6 deletions(-)
> 
> diff --git a/arch/arm64/boot/dts/freescale/imx8mm-kontron-bl-osm-s.dts b/arch/arm64/boot/dts/freescale/imx8mm-kontron-bl-osm-s.dts
> index 8b16bd68576c..bdcd9cd843c7 100644
> --- a/arch/arm64/boot/dts/freescale/imx8mm-kontron-bl-osm-s.dts
> +++ b/arch/arm64/boot/dts/freescale/imx8mm-kontron-bl-osm-s.dts
> @@ -344,7 +344,7 @@ MX8MM_IOMUXC_SD2_DATA1_USDHC2_DATA1		0x1d0
>  			MX8MM_IOMUXC_SD2_DATA2_USDHC2_DATA2		0x1d0
>  			MX8MM_IOMUXC_SD2_DATA3_USDHC2_DATA3		0x1d0
>  			MX8MM_IOMUXC_SD2_CD_B_GPIO2_IO12		0x019
> -			MX8MM_IOMUXC_GPIO1_IO04_USDHC2_VSELECT		0x1d0
> +			MX8MM_IOMUXC_GPIO1_IO04_USDHC2_VSELECT		0x400001d0
>  		>;
>  	};
>  
> @@ -357,7 +357,7 @@ MX8MM_IOMUXC_SD2_DATA1_USDHC2_DATA1		0x1d4
>  			MX8MM_IOMUXC_SD2_DATA2_USDHC2_DATA2		0x1d4
>  			MX8MM_IOMUXC_SD2_DATA3_USDHC2_DATA3		0x1d4
>  			MX8MM_IOMUXC_SD2_CD_B_GPIO2_IO12		0x019
> -			MX8MM_IOMUXC_GPIO1_IO04_USDHC2_VSELECT		0x1d0
> +			MX8MM_IOMUXC_GPIO1_IO04_USDHC2_VSELECT		0x400001d0
>  		>;
>  	};
>  
> @@ -370,7 +370,7 @@ MX8MM_IOMUXC_SD2_DATA1_USDHC2_DATA1		0x1d6
>  			MX8MM_IOMUXC_SD2_DATA2_USDHC2_DATA2		0x1d6
>  			MX8MM_IOMUXC_SD2_DATA3_USDHC2_DATA3		0x1d6
>  			MX8MM_IOMUXC_SD2_CD_B_GPIO2_IO12		0x019
> -			MX8MM_IOMUXC_GPIO1_IO04_USDHC2_VSELECT		0x1d0
> +			MX8MM_IOMUXC_GPIO1_IO04_USDHC2_VSELECT		0x400001d0
>  		>;
>  	};
>  };
> diff --git a/arch/arm64/boot/dts/freescale/imx8mm-kontron-bl.dts b/arch/arm64/boot/dts/freescale/imx8mm-kontron-bl.dts
> index a079322a3793..ba2a4491cf31 100644
> --- a/arch/arm64/boot/dts/freescale/imx8mm-kontron-bl.dts
> +++ b/arch/arm64/boot/dts/freescale/imx8mm-kontron-bl.dts
> @@ -321,7 +321,7 @@ MX8MM_IOMUXC_SD2_DATA1_USDHC2_DATA1		0x1d0
>  			MX8MM_IOMUXC_SD2_DATA2_USDHC2_DATA2		0x1d0
>  			MX8MM_IOMUXC_SD2_DATA3_USDHC2_DATA3		0x1d0
>  			MX8MM_IOMUXC_SD2_CD_B_GPIO2_IO12		0x019
> -			MX8MM_IOMUXC_GPIO1_IO04_USDHC2_VSELECT		0x1d0
> +			MX8MM_IOMUXC_GPIO1_IO04_USDHC2_VSELECT		0x400001d0
>  		>;
>  	};
>  
> @@ -334,7 +334,7 @@ MX8MM_IOMUXC_SD2_DATA1_USDHC2_DATA1		0x1d4
>  			MX8MM_IOMUXC_SD2_DATA2_USDHC2_DATA2		0x1d4
>  			MX8MM_IOMUXC_SD2_DATA3_USDHC2_DATA3		0x1d4
>  			MX8MM_IOMUXC_SD2_CD_B_GPIO2_IO12		0x019
> -			MX8MM_IOMUXC_GPIO1_IO04_USDHC2_VSELECT		0x1d0
> +			MX8MM_IOMUXC_GPIO1_IO04_USDHC2_VSELECT		0x400001d0
>  		>;
>  	};
>  
> @@ -347,7 +347,7 @@ MX8MM_IOMUXC_SD2_DATA1_USDHC2_DATA1		0x1d6
>  			MX8MM_IOMUXC_SD2_DATA2_USDHC2_DATA2		0x1d6
>  			MX8MM_IOMUXC_SD2_DATA3_USDHC2_DATA3		0x1d6
>  			MX8MM_IOMUXC_SD2_CD_B_GPIO2_IO12		0x019
> -			MX8MM_IOMUXC_GPIO1_IO04_USDHC2_VSELECT		0x1d0
> +			MX8MM_IOMUXC_GPIO1_IO04_USDHC2_VSELECT		0x400001d0

The VSELECT pin should be driven by the (u)sdhc core...

>  		>;
>  	};
>  };
> diff --git a/arch/arm64/boot/dts/freescale/imx8mm-kontron-osm-s.dtsi b/arch/arm64/boot/dts/freescale/imx8mm-kontron-osm-s.dtsi
> index 5172883717d1..90daaf54e704 100644
> --- a/arch/arm64/boot/dts/freescale/imx8mm-kontron-osm-s.dtsi
> +++ b/arch/arm64/boot/dts/freescale/imx8mm-kontron-osm-s.dtsi
> @@ -196,6 +196,7 @@ reg_nvcc_sd: LDO5 {
>  				regulator-name = "NVCC_SD (LDO5)";
>  				regulator-min-microvolt = <1800000>;
>  				regulator-max-microvolt = <3300000>;
> +				sd-vsel-gpios = <&gpio1 4 GPIO_ACTIVE_HIGH>;

and by using the sd-vsel-gpios property the IOMUXC_GPIO1_IO04 have to be
muxed as GPIO, which is not the case. So I think that u-boot have a bug
within the (u)sdhc core.

Regards,
  Marco

>  			};
>  		};
>  	};
> diff --git a/arch/arm64/boot/dts/freescale/imx8mm-kontron-sl.dtsi b/arch/arm64/boot/dts/freescale/imx8mm-kontron-sl.dtsi
> index 1f8326613ee9..7468a8aa771d 100644
> --- a/arch/arm64/boot/dts/freescale/imx8mm-kontron-sl.dtsi
> +++ b/arch/arm64/boot/dts/freescale/imx8mm-kontron-sl.dtsi
> @@ -195,6 +195,7 @@ reg_nvcc_sd: LDO5 {
>  				regulator-name = "NVCC_SD (LDO5)";
>  				regulator-min-microvolt = <1800000>;
>  				regulator-max-microvolt = <3300000>;
> +				sd-vsel-gpios = <&gpio1 4 GPIO_ACTIVE_HIGH>;
>  			};
>  		};
>  	};
> -- 
> 2.39.1
> 
> 
>