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drm/i915: Skip display interruption setup when display is not available
[ Upstream commit a844cfb ] Return ealier in the functions doing interruption setup for GEN8+ also adding a warning in gen8_de_irq_handler() to let us know that something else is still missing. Reviewed-by: Radhakrishna Sripada <radhakrishna.sripada@intel.com> Cc: Ville Syrjälä <ville.syrjala@linux.intel.com> Cc: Lucas De Marchi <lucas.demarchi@intel.com> Signed-off-by: José Roberto de Souza <jose.souza@intel.com> Signed-off-by: Jani Nikula <jani.nikula@intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20210408203150.237947-1-jose.souza@intel.com Signed-off-by: Sasha Levin <sashal@kernel.org>
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