linux-kernel - Re: [PATCH] ARM: dts: imx25-pinfunc: Always set SION for SD CMD

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Date:   Sat, 27 Jan 2018 16:37:33 +0100
From:   Uwe Kleine-König 
        <u.kleine-koenig@...gutronix.de>
To:     Benoît Thébaudeau 
        <benoit.thebaudeau.dev@...il.com>
Cc:     linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        Russell King <linux@...linux.org.uk>,
        Mark Rutland <mark.rutland@....com>,
        Rob Herring <robh+dt@...nel.org>,
        Fabio Estevam <fabio.estevam@....com>,
        Sascha Hauer <kernel@...gutronix.de>,
        Shawn Guo <shawnguo@...nel.org>,
        Michael Nazzareno Trimarchi <michael@...rulasolutions.com>
Subject: Re: [PATCH] ARM: dts: imx25-pinfunc: Always set SION for SD CMD

On Sat, Jan 27, 2018 at 01:07:52AM +0100, Benoît Thébaudeau wrote:
> The eSDHC does not work properly if the SION bit is not set for the
> bidirectional CMD signal, whatever the eSDHC instance and the selected
> pad. Therefore, setting SION is mandatory for all eSDHC CMD ports. Do
> this for MX25_PAD_*__SD*_CMD in imx25-pinfunc.h in order to enforce this
> behavior for all boards.
> 
> This had already been done for eSDHC1, but not for eSDHC2. Also, define
> MX25_PAD_FEC_MDC__SDHC2_CMD so that all the possible cases are covered
> from now on.

There is an inconsistency in the naming. The eSDHC1 CMD constants are
named:

	MX25_PAD_SD1_CMD__SD1_CMD

The reference calls this:

	CMD of instance: esdhc1.

The register name is correct though. Not sure it's worth to fix this to
use consistent naming (which would result in:

	MX25_PAD_SD1_CMD__ESDHC1_CMD

which looks ugly, too).

> Signed-off-by: Benoît Thébaudeau <benoit.thebaudeau.dev@...il.com>
> ---
>  arch/arm/boot/dts/imx25-pinfunc.h | 8 ++++++--
>  1 file changed, 6 insertions(+), 2 deletions(-)
> 
> diff --git a/arch/arm/boot/dts/imx25-pinfunc.h b/arch/arm/boot/dts/imx25-pinfunc.h
> index 6c63dca1b9b8..6cc71f7e1baa 100644
> --- a/arch/arm/boot/dts/imx25-pinfunc.h
> +++ b/arch/arm/boot/dts/imx25-pinfunc.h
> @@ -236,7 +236,8 @@
>  #define MX25_PAD_LD8__LD8			0x0e8 0x2e0 0x000 0x00 0x000
>  #define MX25_PAD_LD8__UART4_RXD			0x0e8 0x2e0 0x570 0x02 0x000
>  #define MX25_PAD_LD8__FEC_TX_ERR		0x0e8 0x2e0 0x000 0x05 0x000
> -#define MX25_PAD_LD8__SDHC2_CMD			0x0e8 0x2e0 0x4e0 0x06 0x000
> +/* The eSDHC cannot work if SION is not set for the bidirectional CMD signal. */

Maybe reference the more verbose comment for MX25_PAD_SD1_CMD__SD1_CMD
here?

> +#define MX25_PAD_LD8__SDHC2_CMD			0x0e8 0x2e0 0x4e0 0x16 0x000
>  
>  #define MX25_PAD_LD9__LD9			0x0ec 0x2e4 0x000 0x00 0x000
>  #define MX25_PAD_LD9__UART4_TXD			0x0ec 0x2e4 0x000 0x02 0x000
> @@ -316,7 +317,8 @@
>  #define MX25_PAD_CSI_D5__CSPI3_RDY		0x12c 0x324 0x000 0x07 0x000
>  
>  #define MX25_PAD_CSI_D6__CSI_D6			0x130 0x328 0x000 0x00 0x000
> -#define MX25_PAD_CSI_D6__SDHC2_CMD		0x130 0x328 0x4e0 0x02 0x001
> +/* The eSDHC cannot work if SION is not set for the bidirectional CMD signal. */
> +#define MX25_PAD_CSI_D6__SDHC2_CMD		0x130 0x328 0x4e0 0x12 0x001
>  #define MX25_PAD_CSI_D6__SIM1_PD0		0x130 0x328 0x000 0x04 0x000
>  #define MX25_PAD_CSI_D6__GPIO_1_31		0x130 0x328 0x000 0x05 0x000
>  
> @@ -496,6 +498,8 @@
>  #define MX25_PAD_KPP_COL3__GPIO_3_4		0x1c4 0x3bc 0x000 0x05 0x000
>  
>  #define MX25_PAD_FEC_MDC__FEC_MDC		0x1c8 0x3c0 0x000 0x00 0x000
> +/* The eSDHC cannot work if SION is not set for the bidirectional CMD signal. */
> +#define MX25_PAD_FEC_MDC__SDHC2_CMD		0x1c8 0x3c0 0x4e0 0x11 0x002
>  #define MX25_PAD_FEC_MDC__AUD4_TXD		0x1c8 0x3c0 0x464 0x02 0x001
>  #define MX25_PAD_FEC_MDC__GPIO_3_5		0x1c8 0x3c0 0x000 0x05 0x000

I double checked the numbers, and these seem all to be correct.

Best regards
Uwe

-- 
Pengutronix e.K.                           | Uwe Kleine-König            |
Industrial Linux Solutions                 | http://www.pengutronix.de/  |