mmc: sdhci-xenon: add runtime pm support and reimplement standby
Enable runtime pm support for xenon controller, which uses 50ms auto runtime suspend by default. Reimplement system standby based on runtime pm API. Introduce restore_needed to restore the Xenon specific registers when resume. Signed-off-by:Zhoujie Wu <zjwu@marvell.com> Acked-by:
Adrian Hunter <adrian.hunter@intel.com> Signed-off-by:
Ulf Hansson <ulf.hansson@linaro.org>
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