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drm/i915/gen9: Fix runtime PM refcounting in case DMC firmware isn't …
…loaded While we disable runtime PM and with that display power well support if the DMC firmware isn't loaded, we still want to disable power wells during system suspend and driver unload. So drop/reacquire the corresponding power refcount during suspend/resume and driver unloading. This also means we have to check if DMC is not loaded and skip enabling DC states in the power well code. v2: - Reuse intel_csr_ucode_suspend() in intel_csr_ucode_fini() instead of opencoding the former. (Chris) - Add docbook comment to the public resume and suspend functions. CC: Chris Wilson <chris@chris-wilson.co.uk> Signed-off-by: Imre Deak <imre.deak@intel.com> Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk> Link: http://patchwork.freedesktop.org/patch/msgid/1460980101-14713-1-git-send-email-imre.deak@intel.com
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