From: Balaji T K <balajitk@ti.com>
Date: Fri, 25 Jan 2013 11:30:30 +0000 (+0530)
Subject: mmc: core: expose RPMB partition only for CMD23 capable hosts
X-Git-Tag: v3.9-rc1~78^2~34
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=d0123ccac55088811bde4f76c4a3fdbd39c3cfba;p=pandora-kernel.git

mmc: core: expose RPMB partition only for CMD23 capable hosts

SET_BLOCK_COUNT CMD23 is needed for all access to RPMB partition.  If
block count is not set by CMD23, all subsequent read/write commands fail
as per eMMC specification. So, If the host does not support CMD23, do not
expose RPMB partition.

Accessing RPMB partition can cause hang / huge delay for hosts which do
not support CMD23.

Signed-off-by: Balaji T K <balajitk@ti.com>
Reported-and-Tested-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
Cc: stable <stable@vger.kernel.org>
Signed-off-by: Chris Ball <cjb@laptop.org>
---

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