Re: [PATCH] mmc: core: Add option to prevent eMMC sleep command

[Ulf Hansson <ulf.hansson@stericsson.com>]

Subhash Jadavani wrote:
> 
>> -----Original Message-----
>> From: Ulf Hansson [mailto:ulf.hansson@stericsson.com]
>> Sent: Wednesday, December 14, 2011 9:04 PM
>> To: Subhash Jadavani
>> Cc: linux-mmc@vger.kernel.org; 'Chris Ball'; Per FORLIN; Johan RUDHOLM;
>> 'Lee Jones'
>> Subject: Re: [PATCH] mmc: core: Add option to prevent eMMC sleep
>> command
>>
>> Subhash Jadavani wrote:
>>> Why is this patch needed? Do you see any issue with eMMC sleep on
>> particular
>>> cards?
>>>
>>> Regards,
>>> Subhash
>> Suppose the eMMC is put in sleep state when doing suspend, at that
>> point
>> the kernel crashes. The kernel crash is supposed to be dumped to the
>> same eMMC by some other software than the kernel itself. But this
>> software do not have support for waking up the eMMC from sleep and is
>> thus not able to store the dump.
> 
> Ok. This means that SW still has some support to read/write eMMC. As part of
> suspend, we also deselect the card. So does that SW is capable of
> re-selecting the card and the do read/write transfer? I know this discussion
> might not be required. But still it's good to know.

Sorry, but I can't go into too much details, since this software is 
proprietary. :-)

> 
> As far as patch is concerned, it looks good. You might want to mention the
> motivation for this patch in commit text.

I fix in a V2 patch.

> 
>> Br
>> Ulf Hansson
> 
>