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H A Ddsi.cdiff ef8187d752650fe79239c5de9efc906cb7f6b30d Fri Aug 07 09:29:54 CEST 2015 Thierry Reding <treding@nvidia.com> drm/tegra: dsi: Implement runtime PM

Use runtime PM to clock-(un)gate, (de)assert reset and control power to
the DSI controller. This ties in nicely with atomic DPMS in that a
runtime PM reference is taken before a pipe is enabled and dropped after
it has been shut down.

Signed-off-by: Thierry Reding <treding@nvidia.com>