On Monday 04 May 2015 21:17:27 Joakim Tjernlund wrote:
> On Mon, 2015-05-04 at 19:31 +0200, Arnd Bergmann wrote:
> > On Monday 04 May 2015 18:31:31 Joakim Tjernlund wrote:
> > > @@ -252,6 +260,8 @@ static void esdhc_of_platform_init(struct sdhci_host
> > > *host)
> > >
> > > if (vvn > VENDOR_V_22)
> > > host->quirks &= ~SDHCI_QUIRK_NO_BUSY_IRQ;
> > > +
> > > + host->mmc->caps |= MMC_CAP_8_BIT_DATA;
> > > }
> > >
> >
> > Shouldn't this check the "bus-width" property before setting the width?
> >
> > There might be an eMMC or SDIO with 4-bit interface connected.
>
> This is for an eMMC chip we got and I THINK(this is new to me) that
> this only allows 8 bit negotiation but I might be way off.
>
> Anyone knows for sure?
>
Most mmc host controllers can work with both eMMC and SD cards or
some of the less common variants (SDIO, eSD, MMC, ...), and most of those
are not 8 bit wide.
Arnd
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