linux-kernel - Re: [PATCH 2.6.19] mmc: Add support for SDHC cards

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Date:	Mon, 01 Jan 2007 07:20:21 -0800
From:	Philip Langdale <philipl@...rt.org>
To:	Pierre Ossman <drzeus-list@...eus.cx>
CC:	linux-kernel@...r.kernel.org, John Gilmore <gnu@...d.com>
Subject: Re: [PATCH 2.6.19] mmc: Add support for SDHC cards

I will post the updated diff as a separate follow up.

Pierre Ossman wrote:
> 
> When you have a commit message larger than the patch, you know there is
> something wrong. ;)
> 
> Please skip the part about MMC at least.

Heh. I forget that you don't want to manually alter the email. Will do.

> 
> Actually, the way the spec describes version 2.0 of the CSD leaves my
> stomach a bit upset. I think we will find cards that put bogus values in
> the fields, expecting most hosts to use the well defined values. So I'd
> prefer a switch statement here, where csd_struct == 1 results in hard
> coded values for many fields.

I'm less pessimistic than you about this, but I have no problems with
hard-coding.

>> +	cmd.opcode = SD_SEND_IF_COND;
>>   
> 
> Put this in mmc_setup() with the rest of the initialisation. Hiding in
> here just confuses things.

Done. I thought we needed it before both SD_APP_SEND_OP_COND calls but
it's only needed before the second one so I've moved it inline into
mmc_setup.

> Also, please add a comment about why you manipulate the ocr.

Done.

> 
> Wrong. R7 is defined as MMC_RSP_PRESENT|MMC_RSP_CRC|MMC_RSP_OPCODE.
> 
> (So is R6 btw, wonder why that is...)

Ah - I knew they were both the same so I made R7 match R6. :-)

I've added OPCODE to both.

Thanks,

--phil
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