drm/i915: Fix DPT suspend/resume on !HAS_DISPLAY platforms
The drm.mode_config state is not initialized in case of !HAS_DISPLAY so taking the fb_lock and iterating the fb list won't work on those platforms. Skip the suspend/resume with an explicit check for this. Fixes: 9755f055 ("drm/i915: Restore memory mapping for DPT FBs across system suspend/resume") Cc: Chris Wilson <chris@chris-wilson.co.uk> Cc: Ville Syrjala <ville.syrjala@linux.intel.com> Cc: Jani Nikula <jani.nikula@linux.intel.com> Signed-off-by: Imre Deak <imre.deak@intel.com> Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20211125171603.1775179-1-imre.deak@intel.com
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