> -----Original Message-----
> From: Felipe Balbi [mailto:m...@felipebalbi.com]
> Sent: Tuesday, April 06, 2010 12:01 AM
> To: Madhusudhan
> Cc: m...@felipebalbi.com; 'kishore kadiyala'; 'Vimal Singh';
> t...@atomide.com; svenk...@ti.com; linux-omap@vger.kernel.org; linux-
> ker...@vger.kernel.org; jarkko.lavi...@nokia.com
> Subject: Re: [PATCH v3] OMAP: Fix for bus width which improves SD card's
> peformance.
>
> Hi,
>
> On Mon, Apr 05, 2010 at 12:19:29PM -0500, Madhusudhan wrote:
> > Since the first if command already checks for the 8-bit the second check
> > like >= 4 is definitely not readable in my opinion.
>
> how come ???
>
> > Functionally do you see anything wrong with this patch??
>
> functionally no, but (hypothetical situation) and if on
> omap4/5/6/whatever, omap controller supports a bigger bus width then
> you'll have to add a line like:
>
> + if (mmc_slot(host).wires == 16)
> + mmc->caps |= (MMC_CAP_16_BIT_DATA | MMC_CAP_8_BIT_DATA |
> + MMC_CAP_4_BIT_DATA);
> - if (mmc_slot(host).wires == 8)
> + else if (mmc_slot(host).wires == 8)
>
> do you see the problem ?? In my opinion it doesn't scale well.
>
The point we should note here is that MMC spec supports a max bus width of
8-bit. So anything beyond 8-bit is not in the picture as of today.
But, my bad on miss interpreting the snippet Felipe sent earlier.
if (mmc_slot(host).wires >= 8)
mmc->caps |= MMC_CAP_8_BIT_DATA;
if (mmc_slot(host).wires >= 4)
mmc->caps |= MMC_CAP_4_BIT_DATA;
I missed the fact that you removed the setting of 4-bit from the first
check.
I am okay with the above snippet as it is a trivial change that we are
trying to patch here which fixes an important issue.
Regards,
Madhu
> --
> balbi
--
To unsubscribe from this list: send the line "unsubscribe linux-omap" in
the body of a message to majord...@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
