mmc: sunxi: Gate the clock when rate is 0
The MMC core assumes that the code will gate the clock when the bus frequency is set to 0, which we've been ignoring so far. Handle that. Signed-off-by: NMaxime Ripard <maxime.ripard@free-electrons.com> Tested-by: NFlorian Vaussard <florian.vaussard@heig-vd.ch> Acked-by: NChen-Yu Tsai <wens@csie.org> Signed-off-by: NUlf Hansson <ulf.hansson@linaro.org>
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