drm/i915/gen9: Fix runtime PM refcounting in case DMC firmware isn't loaded
authorImre Deak <imre.deak@intel.com>
Mon, 18 Apr 2016 11:48:21 +0000 (14:48 +0300)
committerImre Deak <imre.deak@intel.com>
Tue, 19 Apr 2016 09:33:48 +0000 (12:33 +0300)
commitf74ed08d55a059a20dc1e513edc51c18dfaf2add
tree3dc05c647eae7669f66089bb37d996e0a07ae22e
parentbf93ba67e9c05882f05b7ca2d773cfc8bf462c2a
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
drivers/gpu/drm/i915/i915_drv.c
drivers/gpu/drm/i915/intel_csr.c
drivers/gpu/drm/i915/intel_drv.h
drivers/gpu/drm/i915/intel_runtime_pm.c