[U-Boot] [PATCH] mmc: Avoid HS400 mode when accessing boot partitions

[Peng Fan]

> Subject: [PATCH] mmc: Avoid HS400 mode when accessing boot partitions
> 
> According to JEDEC JESD84-B51.pdf section 6.3.3 Boot operation ,
> HS200 & HS400 mode is not supported during boot operation. The U-Boot
> code currently only applies this restriction to HS200 mode, extend this to
> HS400 mode as well.
> 
> Signed-off-by: Marek Vasut <marek.vasut+renesas at gmail.com>
> Cc: Jean-Jacques Hiblot <jjhiblot at ti.com>
> Cc: Nobuhiro Iwamatsu <iwamatsu at nigauri.org>
> Cc: Peng Fan <peng.fan at nxp.com>
> ---
>  drivers/mmc/mmc.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/mmc/mmc.c b/drivers/mmc/mmc.c index
> 456c1b4cc9..71b52c6cf2 100644
> --- a/drivers/mmc/mmc.c
> +++ b/drivers/mmc/mmc.c
> @@ -905,14 +905,14 @@ static int mmc_set_capacity(struct mmc *mmc, int
> part_num)
>  	return 0;
>  }
> 
> -#if CONFIG_IS_ENABLED(MMC_HS200_SUPPORT)
> +#if CONFIG_IS_ENABLED(MMC_HS200_SUPPORT) ||
> +CONFIG_IS_ENABLED(MMC_HS400_SUPPORT)
>  static int mmc_boot_part_access_chk(struct mmc *mmc, unsigned int
> part_num)  {
>  	int forbidden = 0;
>  	bool change = false;
> 
>  	if (part_num & PART_ACCESS_MASK)
> -		forbidden = MMC_CAP(MMC_HS_200);
> +		forbidden = MMC_CAP(MMC_HS_200) | MMC_CAP(MMC_HS_400);
> 
>  	if (MMC_CAP(mmc->selected_mode) & forbidden) {
>  		pr_debug("selected mode (%s) is forbidden for part %d\n",

Reviewed-by: Peng Fan <peng.fan at nxp.com>

> --
> 2.20.1