[media] exynos4-is: Ensure fimc-is clocks are not enabled until properly configured
Use clk_prepare_enable/clk_unprepare_disable instead of preparing the clocks during the driver initalization and then using just clk_disable/ clk_enable. The clock framework doesn't guarantee a clock will not get enabled during e.g. clk_set_parent if clk_prepare has been called on it. So we ensure clk_prepare() is called only when it is safe to enable the clocks, i.e. the parent clocks and the clocks' frequencies are set. It must be ensured the FIMC-IS clocks have proper frequencies before they are enabled, otherwise the whole system will hang. Signed-off-by: NSylwester Nawrocki <s.nawrocki@samsung.com> Signed-off-by: NKyunmin Park <kyungmin.park@samsung.com> Signed-off-by: NMauro Carvalho Chehab <mchehab@redhat.com>
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