linux-kernel - Re: [PATCH] Fixes and enhancements for the MMC SPI driver

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Date:	Thu, 8 Jan 2009 09:22:08 +0100
From:	Wolfgang Mües <wolfgang.mues@...rswald.de>
To:	"Matt Fleming" <matt@...sole-pimps.org>
Cc:	"David Brownell" <dbrownell@...rs.sourceforge.net>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Fixes and enhancements for the MMC SPI driver

Matt,

Am Dienstag, 6. Januar 2009 schrieb Matt Fleming:
> Which cards are you having issues with?

This was a noname 4 GByte SDHC card. If you write a continious stream of data 
at max. speed, the card generates a BUSY signal every 10 seconds for nearly a 
whole second.

> Modifying the code to no longer abide by the standard doesn't seem like a
> win to me.

I strongly disagree with you.

While each and every SD card should conform to the standard, a driver for a 
host controller should be as forgiving as possible. If the driver cannot cope 
with cards sold today, the user has a bad experience.

I code drivers for people and not for standards.

Remember, this is only a timeout. Lengthen the timeout will have no 
consequences for cards which behave.

best regards

i. A. Wolfgang Mües
-- 
Auerswald GmbH & Co. KG
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Telefon: +49 (0)5306 9219 0
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E-Mail: Wolfgang.Mues@...rswald.de
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