Subhash Jadavani wrote:
-----Original Message-----
From: Ulf Hansson [mailto:ulf.hansson@xxxxxxxxxxxxxx]
Sent: Wednesday, December 14, 2011 9:04 PM
To: Subhash Jadavani
Cc: linux-mmc@xxxxxxxxxxxxxxx; '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
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