Re: SD card timeout problems on Nokia N900 (omap_hsmmc on OMAP3)

[Stefan Roese <stefan.roese@gmail.com>]

Hi Sebastian,

On 26.02.2014 07:02, Michael Trimarchi wrote:
> Hi Sebastian
>
> On Wed, Feb 26, 2014 at 12:47 AM, Sebastian Reichel <sre@ring0.de> wrote:
>> Hi,
>>
>> I have problems with the SD-card initialization on my Nokia N900
>> using a 3.14-rc1 based kernel in DT boot mode. The bug is can be
>> circumvented by changing the kernel slightly (e.g. remove some DT
>> nodes or mark them as disabled). So the SD card's timeout problems
>> seem to derive from kernel timing problems. I'm pretty sure, that
>> the problems are not originating from a broken SD card, since
>>
>>   1. The SD card worked quite good before and still does depending
>>      on unrelated DTS changes (=> loading less drivers).
>>   2. The SD card works flawlessly on my notebook using a USB adapter
>>   3. Another SD card showed the same problem
>>
>> I tried to git bisect the problem, but I just get shown some
>> unrelated driver additions.
>>
>> Anyways, this is the error I get during boot:
>>
>> [    3.896820] mmc0: mmc_rescan_try_freq: trying to init card at 400000 Hz
>> ...
>> [    5.956237] mmc0: error -110 whilst initialising SD card
>>
>
> Are you sure that some subsystem that you deactivate don't change
> pin muxing setting? Can you check in the broken system if the pins of the sdcard
> are correctly muxed? Does it happen even if you change the sdcard?

Did you try to add this patch series:

http://www.spinics.net/lists/linux-omap/msg103264.html

Without it I'm also having problems with MMC detection on some OMAP3 
based boards.

Balaji, what is the status of this patch series? Are there any chances 
that it will be included in v3.14?

Thanks,
Stefan