[PATCH 1/2] arm: mach-snapdragon: misc: Initialize eMMC if necessary

[Ramon Fried]

On Mon, Aug 2, 2021 at 5:52 PM Stephan Gerhold <stephan at gerhold.net> wrote:
>
> At the moment U-Boot produces an empty MAC address (02:00:00:00:00:00)
> if the eMMC is not used by anything in U-Boot (e.g. with
> CONFIG_ENV_IS_NOWHERE=y instead of having the environment on eMMC).
> This happens because then there is nothing that actually initializes
> the eMMC and reads the "cid" that is later accessed.
>
> To fix this, call mmc_init() to ensure the eMMC is initialized.
> There is no functional difference if the eMMC is already initialized
> since then mmc_init() will just return without doing anything.
>
> Cc: Ramon Fried <rfried.dev at gmail.com>
> Signed-off-by: Stephan Gerhold <stephan at gerhold.net>
> ---
>
>  arch/arm/mach-snapdragon/misc.c | 3 +++
>  1 file changed, 3 insertions(+)
>
> diff --git a/arch/arm/mach-snapdragon/misc.c b/arch/arm/mach-snapdragon/misc.c
> index aaa561c2c6..5c062e9636 100644
> --- a/arch/arm/mach-snapdragon/misc.c
> +++ b/arch/arm/mach-snapdragon/misc.c
> @@ -33,6 +33,9 @@ u32 msm_board_serial(void)
>         if (!mmc_dev)
>                 return 0;
>
> +       if (mmc_init(mmc_dev))
> +               return 0;
> +
>         return UNSTUFF_BITS(mmc_dev->cid, 16, 32);
>  }
>
> --
> 2.32.0
>
Reviewed-by: Ramon Fried <rfried.dev at gmail.com>