linux-kernel - Re: [PATCH RFC 3/5] mmc: mmci: relax blksz check for SDIO

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Date:	Wed, 13 Aug 2014 06:14:44 +0100
From:	Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
To:	Russell King - ARM Linux <linux@....linux.org.uk>
CC:	linux-mmc@...r.kernel.org,
	Linus Walleij <linus.walleij@...aro.org>,
	Chris Ball <chris@...ntf.net>,
	Ulf Hansson <ulf.hansson@...aro.org>,
	linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org
Subject: Re: [PATCH RFC 3/5] mmc: mmci: relax blksz check for SDIO

Thankyou for the feedback.

On 12/08/14 15:12, Russell King - ARM Linux wrote:
> On Tue, Aug 12, 2014 at 01:04:40PM +0100, Srinivas Kandagatla wrote:
>> From: Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
>>
>> This patch adds condition in mmci_validate_data to skip checking
>> blocksize for SDIO card types. SDIO card type can issue blocksizes
>> which are not exactly power of 2 so this check always fails, resulting
>> in SDIO failures.
>
> Do you understand why this check is there?
>
> Do you realise that the standard MMCI from ARM Ltd can /only/ perform
> power-of-2 block transfers?

Yes, I noticed that in pl180 TRM. I agree this patch will break standard 
MMCI.

In the past Ulf Hansson and Stefan Nilsson have submitted a patch to fix 
this issue for ux500v2. This patch adds new flag non_power_of_2_blksize 
/ any_blksize to variant_data.

http://www.spinics.net/lists/linux-mmc/msg12160.html
http://marc.info/?l=linux-mmc&m=131710963908853&w=2

This patch will fix the issue for Qcom too. If you are Ok with adding 
new flag non_power_of_2_blksize/any_blksize in the variant_data, I can 
rebase and include Ulf's patch in next version.


thanks,
--srini

>
> Hence, NAK on this change as it stands.
>
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