drm/i915: Disable runtime-pm using lowlevel functions if !HAS_RC6
If we cannot setup rc6, we cannot let the GPU suspend itself as it cannot save its state (to a powercontext). As such, we must disable runtime-pm, but we should do so using the low-level pm-runtime function which leaves our own debugging functions intact (and continue to detect errors in our runtime-pm handling should we ever be able to enable rc6). Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Reviewed-by: Mika Kuoppala <mika.kuoppala@linux.intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20180812223642.24865-3-chris@chris-wilson.co.uk
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