[PATCH v2 0/2]mmc: implemented eMMC4.4 hardware reset feature

["Chuanxiao.Dong" <chuanxiao.dong@intel.com>]

Hello Chris,
	  Several days ago, I send a patch which is used to implement the
	  eMMC4.4 hardware reset feature. But did not get any response till
	  now. I have splitted that patch into 2 for easy understanding, and
	  posting here for you to review it. Thanks.

	  The 2 patches implemented eMMC4.4 hardware reset feature in core
	  layer and sdhci host layer, but need each sdhci host controller to
	  implement the real reset part specially.

	  patch 0001: implemented eMMC4.4 hardware reset feature in mmc core
	  layer.
	  patch 0002: implemented hardware reset callback in sdhci host
	  layer.

	  I also have a concern about the enabling hardware reset part. As
	  eMMC 4.4 standar says, to enable hardware reset need to set the bit
	  0 of byte 162 in ext_csd register. However this register is onetime
	  programmable, once setted, cannot be changed any more. And the
	  standar also says this feature is disabled by default. If driver
	  does not set it, the feature can not be enabled. So is it suitable
	  for driver to set this bit?

Thanks
Chuanxiao