On 16 December 2014 at 07:18, ashish yadav <ashishyadav78@xxxxxxxxx> wrote: > 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 <ashishyadav78@xxxxxxxxx> 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. Sorry, we just don't care much about such old kernels. Kind regards Uffe >> >> 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 -- To unsubscribe from this list: send the line "unsubscribe linux-mmc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
