linux-kernel - RE: [PATCH] mmc: align data size for host which only supports power-of-2 block

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Date:	Tue, 7 Apr 2009 16:34:37 +0800
From:	"Cai, Cliff" <Cliff.Cai@...log.com>
To:	"Pierre Ossman" <drzeus-mmc@...eus.cx>
CC:	"Bryan Wu" <cooloney@...nel.org>, <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH] mmc: align data size for host which only supports power-of-2 block

 

>-----Original Message-----
>From: Pierre Ossman [mailto:drzeus-mmc@...eus.cx] 
>Sent: Monday, April 06, 2009 3:09 AM
>To: Cai, Cliff
>Cc: Bryan Wu; linux-kernel@...r.kernel.org
>Subject: Re: [PATCH] mmc: align data size for host which only 
>supports power-of-2 block
>
>On Thu, 26 Mar 2009 10:22:54 +0800
>"Cai, Cliff" <Cliff.Cai@...log.com> wrote:
>
>> >
>> >mmc_align_data_size() shouldn't be adjusting the size to 
>something it 
>> >can easily determine that it's invalid.
>> 
>> Should I create a new function to do the power-of-2 adjustment?
>> Or any ideal way to do it?
>
>That function is the correct place. My point was that we need 
>to check after the adjustment that we didn't violate any of 
>the other restrictions the driver has set. If we do, we should 
>just return the original value.

What are other restrictions?I don't see any other restrictions on data
size in current host driver
Except 4 byte alignment.


>> Otherwise,the SDH almost can't be used as sdio host.
>
>Unfortunately I think this controller will be very unsuitable 
>as an SDIO controller anyway with that restriction.

Yes,But since we need to support some SDIO devices according to our
customers'
Requests ,I think we have no other choice of this.


Thanks

Cliff
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