[PATCH v1 0/4]mmc: enable eMMC4.41 new feature backgroundoperations and HPI

[Chuanxiao Dong]

Hi,
	These patches were enabled eMMC4.41 standard new feature: background
	operations and HPI.

	Since these two features are opertional, driver only enable for those
	eMMC card which supports them.

	HPI can interrupt both background operations and low priority foreground
	operations. In these patches, only implemented using HPI to interrupt
	background operations.

	patch1: enable background operations feature for supported eMMC card.
	patch2: let eMMC card do background operations when user reqeust queue
	is idle. In this patch, also considered when driver added runtime power
	management.
	patch3: enable HPI feature for supported eMMC card.
	patch4: use HPI to interrupt background operations if there is user
	request(foreground operations).

Thanks
Chuanxiao
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