linux-kernel - Re: MMC: CRC Errors with 2GB cards

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Message-ID: <20071029095015.GA20714@grex.cyberspace.org>
Date:	Mon, 29 Oct 2007 05:50:15 -0400
From:	Roopesh <roopesh@...erspace.org>
To:	Pierre Ossman <drzeus-list@...eus.cx>
Cc:	Roopesh <roopesh@...erspace.org>, linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: MMC: CRC Errors with 2GB cards

 Hi Pierrie, 

 Thanks for writing back. 

:     > -			} while (!(cmd.resp[0] & R1_READY_FOR_DATA));
:     > -
:     > +			} while (!(R1_CURRENT_STATE(cmd.resp[0]) == 4)); 
:     > +			
:     >  #if 0
:     
:     This might trade us one problem for another. Could you try the following:
:     
:     } while (!(cmd.resp[0] & R1_READY_FOR_DATA) || (R1_CURRENT_STATE(cmd.resp[0]) == 7));
:
:     
:     This should also work for cards that mishandle the state field, and if the card jumps to
:     some odd state for some reason.
:     
:     > 
:     >  I am just wondering if I have set of broken cards.  Any pointers 
:     >  in this regard?
:     > 
:     
:     You do. But don't be too alarmed, that is unfortunately the norm. :/
:     

 I have purchased 4 Transcend cards, and all of them behave the 
 same way.  Just wondering why others dont have this problem, and 
 why such a fix hasn't made it to main tree yet.

 I have tried the fix, and it works fine.  Thanks.

 Roopesh.
-
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