Hi,
Can any one please look into this & share info about MMC/SD 4.41
Specification for 2.6.32 Linux Kernel.
Thanks & Regards
Ashish
On Mon, Dec 15, 2014 at 2:00 PM, ashish yadav <[email protected]> wrote:
> 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 <[email protected]>
> 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 <[email protected]>
> Signed-off-by: Chris Ball <[email protected]>
>
>
>
>
> 2. commit 211d4fe580735bab850d31f9e4c0a62b47a38bb2
> Author: Venkatraman S <[email protected]>
> 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 <[email protected]>
> Acked-by: Felipe Balbi <[email protected]>
> Signed-off-by: Chris Ball <[email protected]>
>
>
>
> 3. commit 950d56acce5d401f477b91d0177605b543d63d07
> Author: Jaehoon Chung <[email protected]>
> 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 <[email protected]>
> Signed-off-by: Kyungmin Park <[email protected]>
> Signed-off-by: Konstantin Dorfman <[email protected]>
> Reviewed-by: Maya Erez <[email protected]>
> Signed-off-by: Chris Ball <[email protected]>
>
>
> 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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