drm/i915/mtl: add GSC CS interrupt support
The GSC CS re-uses the same interrupt bits that the GSC used in older platforms. This means that we can now have an engine interrupt coming out of OTHER_CLASS, so we need to handle that appropriately. v2: clean up the if statement for the engine irq (Tvrtko) Signed-off-by: Daniele Ceraolo Spurio <daniele.ceraolospurio@intel.com> Cc: Matt Roper <matthew.d.roper@intel.com> Cc: Tvrtko Ursulin <tvrtko.ursulin@linux.intel.com> Reviewed-by: Matt Roper <matthew.d.roper@intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20221102171047.2787951-4-daniele.ceraolospurio@intel.com
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