[Feature] eMMC 5.0 support

[Yingying Zhao]

The primary feature of eMMC 5.0 is a new high speed transfer mode called HS400. Core support for HS400 is queued for linux v3.16 (http://git.kernel.org/cgit/linux/kernel/git/cjb/mmc.git/commit/?h=mmc-next&id=0a5b6438ee482696360bb013e67b8488f63d3e9e ) but support by SDHCI is still missing.

Upstream status:
Target - kernel 4.2

[XiongZhang (xiong-y-zhang)]

While basic support made it to 3.19, but lack of HS400 re-tuning
Intel posted 2 series of patches but they missed 4.0
http://marc.info/?l=linux-mmc&m=142252567401017
http://marc.info/?l=linux-mmc&m=142322491517086

[Leann Ogasawara (leannogasawara)]

Per discussion between Canonical and Intel, retarget for 15.10.

[XiongZhang (xiong-y-zhang)]

the second patchset have been accepted and are queued for v4.2.
http://marc.info/?l=linux-mmc&m=143254347628295&w=2

[XiongZhang (xiong-y-zhang)]

Second set of patches have been accepted and are queued for v4.2.
http://thread.gmane.org/gmane.linux.kernel.mmc/32229/

[Leann Ogasawara (leannogasawara)]

A 4.2 based kernel is officially available in the archive for Wily 15.10. Marking this Fix Released.