[U-Boot] [PATCH] mmc: mv_sdhci: Fix host version read for Armada100

[Marek Vasut <marek.vasut@gmail.com>]

> sdhci_readw does not work for host version read in Armada100 series
> SoCs. This patch fix this issue by making a sdhci_readl call to get host
> version.
> 
> Signed-off-by: Ajay Bhargav <ajay.bhargav@einfochips.com>
> ---
>  drivers/mmc/mv_sdhci.c |    6 ++++++
>  1 files changed, 6 insertions(+), 0 deletions(-)
> 
> diff --git a/drivers/mmc/mv_sdhci.c b/drivers/mmc/mv_sdhci.c
> index f92caeb..c7fd287 100644
> --- a/drivers/mmc/mv_sdhci.c
> +++ b/drivers/mmc/mv_sdhci.c
> @@ -30,6 +30,7 @@ static inline void mv_sdhci_writeb(struct sdhci_host
> *host, u8 val, int reg) #endif /* CONFIG_MMC_SDHCI_IO_ACCESSORS */
> 
>  static char *MVSDH_NAME = "mv_sdh";
> +
>  int mv_sdh_init(u32 regbase, u32 max_clk, u32 min_clk, u32 quirks)
>  {
>  	struct sdhci_host *host = NULL;
> @@ -48,7 +49,12 @@ int mv_sdh_init(u32 regbase, u32 max_clk, u32 min_clk,
> u32 quirks) mv_ops.write_b = mv_sdhci_writeb;
>  	host->ops = &mv_ops;
>  #endif
> +#ifdef CONFIG_ARMADA100
> +	/* SDHCI host version read workaround for Armada100 series */
> +	host->version = sdhci_readl(host, SDHCI_HOST_VERSION - 2) >> 16;
> +#else
>  	host->version = sdhci_readw(host, SDHCI_HOST_VERSION);
> +#endif
>  	add_sdhci(host, max_clk, min_clk);
>  	return 0;
>  }

Basically armada100 can't do 16bit access to that register. Ok, but why does it 
work for other registers? Also, can you make this a config option like 
CONFIG_SDHCI_REG32_QUIRK (invent some better name ;-) ).

Cheers