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

[Ajay Bhargav <ajay.bhargav@einfochips.com>]

----- "Marek Vasut" <marek.vasut@gmail.com> wrote:

> > 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
> 
Hi Marek,

Armada100 SOC has this bug for particularly that register. This is particularly for that register so Do you think a config is required for this?

Regards,
Ajay Bhargav