drm/tilcdc: cleanup runtime PM handling
Cleanup runtime PM handling. Before the patch the usage of pm_runtime calls was inconsistent and hard to follow. After the update the pm_runtime calls are removed from set_scanout() and called around major operations that access the HW. After the patch the DPMS code does not have pm_runtime_forbid/allow calls any more and pm_runtime_irq_safe() is not set anymore. Signed-off-by: NTomi Valkeinen <tomi.valkeinen@ti.com> [Added description to the patch] Signed-off-by: NJyri Sarha <jsarha@ti.com>
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