drm/i915: Verify power domains after enabling them
After commit 2cd9a689 ("drm/i915: Refactor intel_display_set_init_power() logic") it makes more sense to check the power domain/well refcounts after enabling the power domains functionality. Before that it's guaranteed that most power wells (in the INIT domain) will have a reference held, so not an interesting state. While at it also add the check after the init_hw/fini_hw, disable and suspend/resume steps. Make the test optional on a Kconfig option since it may add substantial overhead: on VLV/CHV the corresponding PUNIT reg access for each power well may take up to 20ms. v2: - Add the state check to more spots. (Chris) v3: - During suspend check the state before deiniting display core. Afterwards DC states are disabled (and so the dc_off power well is enabled) even though we don't hold a reference on it. - Do the test conditionally based on a new Kconfig option. (Chris) Cc: Chris Wilson <chris@chris-wilson.co.uk> Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk> [Add DRM_I915_DEBUG_RUNTIME_PM to welcome messages] Signed-off-by: Imre Deak <imre.deak@intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20180817145837.26592-1-imre.deak@intel.com
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