[PATCH V2 0/3] mmc: block: Fix tuning (by avoiding it) for RPMB

[Adrian Hunter <adrian.hunter@intel.com>]

Hi

The RPMB partition only allows certain commands.  In particular,
the tuning command (CMD21) is not allowed -  refer JEDEC eMMC
standard v5.1 section 6.2.2 Command restrictions.

That means commands will begin failing if re-tuning is needed
while switched to the RPMB partition.

As we discussed here:

	http://marc.info/?l=linux-mmc&m=146218765801869

this patch set takes a new approach which is:

	Re-tune before switching to the RPMB partition
	Don't allow re-tuning while switched to RPMB
	Switch back from the RPMB partition immediately

I gave it a brief test with a HS400 eMMC and using mmc utils
to access RPMB.  Despite all the partition switches and
re-tuning in between, all RPMB operations were successful.


Changes in V2:

	New approach entirely


Adrian Hunter (3):
      mmc: core: Add a facility to "pause" re-tuning
      mmc: block: Always switch back to main area after RPMB access
      mmc: block: Pause re-tuning while switched to the RPMB partition

 drivers/mmc/card/block.c | 19 ++++++++++++++++++-
 drivers/mmc/core/host.c  | 22 ++++++++++++++++++++++
 include/linux/mmc/host.h |  4 ++++
 3 files changed, 44 insertions(+), 1 deletion(-)


Regards
Adrian