I want to support MMC 4.41 Specification for 2.6.32 Linux Kernel Version.
AFAIK, these support is not available in 2.6.32.
Looking into 3.18 Kernel, I found following commit for MMC 4.41 Specification:
1. commit eb0d8f135b6730d6d0324a064664d1
21334290e7
Author: Jaehoon Chung <jh80.chung@xxxxxxxxxxx>
Date: Tue Oct 18 01:26:42 2011 -0400
mmc: core: support HPI send command
HPI command is defined in eMMC4.41.
This feature is important for eMMC4.5 devices.
Signed-off-by: Jaehoon Chung <jh80.chung@xxxxxxxxxxx>
Signed-off-by: Chris Ball <cjb@xxxxxxxxxx>
2. commit 211d4fe580735bab850d31f9e4c0a62b47a38bb2
Author: Venkatraman S <svenkatr@xxxxxx>
Date: Tue Aug 7 19:24:45 2012 +0530
mmc: core: Add TRANsfer state to non-HPI state
HPI can be issued only in programming state to bring the card to
transfer state. If the card is already in transfer state, doing
a HPI is redundant.
Fix this by adding transfer state to the list of exceptions to
doing HPI and return without error.
Signed-off-by: Venkatraman S <svenkatr@xxxxxx>
Acked-by: Felipe Balbi <balbi@xxxxxx>
Signed-off-by: Chris Ball <cjb@xxxxxxxxxx>
3. commit 950d56acce5d401f477b91d0177605b543d63d07
Author: Jaehoon Chung <jh80.chung@xxxxxxxxxxx>
Date: Mon Sep 17 08:42:02 2012 +0000
mmc: support BKOPS feature for eMMC
Enable eMMC background operations (BKOPS) feature.
If URGENT_BKOPS is set after a response, note that BKOPS are required.
Immediately run BKOPS if required. Read/write operations should be
requested during BKOPS(LEVEL-1), then issue HPI to interrupt the
ongoing BKOPS and service the foreground operation.
(This patch only controls the LEVEL2/3.)
When repeating the writing 1GB data, at a certain time, performance is
decreased. At that time, card triggers the Level-3 or Level-2. After
running bkops, performance is recovered.
Future considerations:
* Check BKOPS_LEVEL=1 and start BKOPS in a preventive manner.
* Interrupt ongoing BKOPS before powering off the card.
* How do we get BKOPS_STATUS value (periodically send ext_csd command)?
* If using periodic bkops, also consider runtime_pm control.
Signed-off-by: Jaehoon Chung <jh80.chung@xxxxxxxxxxx>
Signed-off-by: Kyungmin Park <kyungmin.park@xxxxxxxxxxx>
Signed-off-by: Konstantin Dorfman <kdorfman@xxxxxxxxxxxxxx>
Reviewed-by: Maya Erez <merez@xxxxxxxxxxxxxx>
Signed-off-by: Chris Ball <cjb@xxxxxxxxxx>
Could you please let me know if above commits/patches are sufficient
for MMC 4.41 Specification (Background operation & HPI) or I need
more patches for same.
Thanks & Regards
Ashish
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