On Tue, Apr 06, 2010 at 06:16:01PM +0200, ext Madhusudhan wrote:
-----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.
in that case, the code could be:
WARN_ON(mmc_slot(host).wires > 8);
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;
--
balbi
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