linux-kernel - RE: [PATCH v3] OMAP: Fix for bus width which improves SD card's peformance.

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Date:	Tue, 6 Apr 2010 18:23:06 -0500
From:	"Madhusudhan" <madhu.cr@...com>
To:	<felipe.balbi@...ia.com>, "'ext Nishanth Menon'" <nm@...com>
Cc:	<me@...ipebalbi.com>,
	"'kishore kadiyala'" <kishorek.kadiyala@...il.com>,
	"'Vimal Singh'" <vimal.newwork@...il.com>, <tony@...mide.com>,
	"'S, Venkatraman'" <svenkatr@...com>, <linux-omap@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>,
	"'Lavinen Jarkko \(Nokia-D/Helsinki\)'" <jarkko.lavinen@...ia.com>
Subject: RE: [PATCH v3] OMAP: Fix for bus width which improves SD card's peformance.



> -----Original Message-----
> From: Felipe Balbi [mailto:felipe.balbi@...ia.com]
> Sent: Tuesday, April 06, 2010 11:57 AM
> To: ext Nishanth Menon
> Cc: Balbi Felipe (Nokia-D/Helsinki); Chikkature Rajashekar, Madhusudhan;
> me@...ipebalbi.com; 'kishore kadiyala'; 'Vimal Singh'; tony@...mide.com;
> S, Venkatraman; linux-omap@...r.kernel.org; linux-kernel@...r.kernel.org;
> Lavinen Jarkko (Nokia-D/Helsinki)
> Subject: Re: [PATCH v3] OMAP: Fix for bus width which improves SD card's
> peformance.
> 
> On Tue, Apr 06, 2010 at 06:55:03PM +0200, ext Nishanth Menon wrote:
> >some reasons why i love switch statements ;) since I dont expect other
> >than precisely 4 and 8 (do we expect 5,6,7 - i might be wrong).. but if
> >it is so, wont the following be better?
> >
> >switch (mmc_slot(host).wires)
> >{
> >case 8:
> >	mmc->caps |= MMC_CAP_8_BIT_DATA;
> >	/* fall thru*/
> >case 4:
> >	mmc->caps |= MMC_CAP_4_BIT_DATA;
> >		break;
> >default:
> >	WARN("bad width");
> >}
> 
> I like that, but I remember Madhu (or someone else) saying he thinks
> it's less readable this way. Go figure...
> 
Well, I did not comment on the usage of switch here. Note we only need to
handle 8-bit and 4-bit.The board files need not setup 8-bit or 4-bit if the
configuration of that board is 1-bit. The driver will still work in 1-bit
mode which would mean there is nothing to do in default case and should not
err out.

Regards,
Madhu

> --
> balbi

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