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Both from a runtime PM and clock management point of view, the ->set_ios()
code is unnecessary complex.
A suboptimal path is also executed when the mmc core requests a clock rate
of zero. As that happens during the card initialization phase, trying to
save power by decreasing the runtime PM usage count and gating the clock
via clk_disable_unprepare() is just superfluous.
Moreover, from a runtime PM point of view the core will anyway keep the
device active during the entire card initialization phase.
Restructure the code to rely on the ios->power_mode to understand when the
runtime PM usage count needs to be increased. Let's also deal with clock
rate changes by simply applying the rate.
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
4caf653a55