linux-kernel - Re: [LIBERTAS-SDIO] Support for single transfer blocks?

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Message-ID: <4A23A51C.2000608@digi.com>
Date:	Mon, 1 Jun 2009 11:53:32 +0200
From:	Luis Galdos <luis.galdos@...i.com>
To:	Dan Williams <dcbw@...hat.com>
CC:	Andrew Morton <akpm@...ux-foundation.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-wireless@...r.kernel.org" <linux-wireless@...r.kernel.org>,
	Pierre Ossman <drzeus@...eus.cx>
Subject: Re: [LIBERTAS-SDIO]  Support for single transfer blocks?

Dan Williams wrote:
> On Tue, 2009-05-12 at 23:11 -0700, Andrew Morton wrote:
>> Let's Cc the wireless development list.
> 
> And lets CC the MMC subsystem maintainer and original author of libertas_sdio too, so
> we can get an informed opinion :)
> 
> What firmware version are you using?
The installed firmware version is 9.70.3p24 (downloaded from the Marvell's website).

> What SDIO controller is this?  Has this controller been validated by Marvell for use
> with the 8686? (not that that is required or anything, just curious).
The uC is from Digi (NS9215) and its SDIO-port hasn't been validated by Marvell.

> All the information I have (up to firmware V10) references a block size of 32 bytes.
> The main firmware is transferred in 32-byte blocks using CMD 53, with a maximum number
> of 16 blocks transferred in a single CMD 53 write depending on how much data the helper
> firmware can accept in single write.  The available vendor drivers also use a 32-byte
> block size.
That's right. I only was surprised that the SD8686 accepts data blocks of 512 bytes in a 
single transfer too. This is just nice for SDIO-ports that only support single blocks :) 
(like the NS9215). Anyway, Pierre has informed me that the SD8686 has need of multiple 
blocks support, and the NS9215 doesn't. So, the problem is the controller.


> Dan

Thanks and sorry for the delayed answer (I was on vacations),


-- 
Luis Galdos

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