drm/i915/execlists: Refactor CSB state machine
Daniele pointed out that the CSB status information will change with Tigerlake and suggested that we could rearrange our state machine to hide the differences in generation. gcc also prefers the explicit state machine, so make it so: process_csb 1980 1967 -13 Suggested-by: NDaniele Ceraolo Spurio <daniele.ceraolospurio@intel.com> Signed-off-by: NChris Wilson <chris@chris-wilson.co.uk> Cc: Daniele Ceraolo Spurio <daniele.ceraolospurio@intel.com> Cc: Tvrtko Ursulin <tvrtko.ursulin@linux.intel.com> Cc: Mika Kuoppala <mika.kuoppala@linux.intel.com> Reviewed-by: NMika Kuoppala <mika.kuoppala@linux.intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20190701100502.15639-4-chris@chris-wilson.co.uk
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