Dear Mr. Jeon,
This is workaround for some Samsung eMMC, MoviNAND.
There are known issue about secure erase & secure trim with these eMMC device which I listed by product_name.
Therefore, for these eMMC devices, we just skip mmc_blk_issue_secdiscard_rq() and use mmc_blk_issue_discard_rq() instead.
You could refer this discussion in XDA developers.
http://forum.xda-developers.com/showthread.php?t=1644364
https://plus.google.com/111398485184813224730/posts/21pTYfTsCkB#111398485184813224730/posts/21pTYfTsCkB
Regards,
Ian
-----Original Message-----
From: Namjae Jeon [mailto:linkinjeon@xxxxxxxxx]
Sent: Monday, August 13, 2012 10:03 PM
To: IAN CHEN
Cc: cjb@xxxxxxxxxx; adrian.hunter@xxxxxxxxx; subhashj@xxxxxxxxxxxxxx; linus.walleij@xxxxxxxxxx; linux-mmc@xxxxxxxxxxxxxxx; linux-kernel@xxxxxxxxxxxxxxx; d.j.shin@xxxxxxxxxxx; jongtae22.kim@xxxxxxxxxxx; kyungmin.park@xxxxxxxxxxx; jh80.chung@xxxxxxxxxxx
Subject: Re: [PATCH] mmc: card: Skip secure option for MoviNAND.
Hi. Ian.
known issue ? Would you explain more ?
Thanks.
2012/8/13 IAN CHEN <ian.cy.chen@xxxxxxxxxxx>:
> From 5c60eb8be04c7440d6e33b8f72ea2046a3657ac4 Mon Sep 17 00:00:00 2001
> From: ian.cy.chen <ian.cy.chen@xxxxxxxxxxx>
> Date: Mon, 13 Aug 2012 10:53:55 +0900
> Subject: [PATCH] mmc: card: Skip secure option for MoviNAND.
>
> For several MoviNAND, there are some known issue with secure option.
> For these specific MoviNAND device, we skip secure option.
>
> Signed-off-by: Ian Chen <ian.cy.chen@xxxxxxxxxxx>
> ---
> drivers/mmc/card/block.c | 24 +++++++++++++++++++++++-
> include/linux/mmc/card.h | 1 +
> 2 files changed, 24 insertions(+), 1 deletions(-)
>
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