drm/i915: Remove special handling for !RCS_MASK()

With both XEHPSDV and PVC removed (as platforms, most of their code
remain used by others), there's no need to handle !RCS_MASK() as
other platforms don't ever have fused-off render. Remove those code
paths and the special WA flag when initializing GuC.
Reviewed-by: Matt Roper <matthew.d.roper@intel.com>
Acked-by: Tvrtko Ursulin <tursulin@ursulin.net>
Link: https://patchwork.freedesktop.org/patch/msgid/20240320060543.4034215-7-lucas.demarchi@intel.comSigned-off-by: Lucas De Marchi <lucas.demarchi@intel.com>

drivers/gpu/drm/i915/gt/intel_engine_cs.c

@@ -497,9 +497,8 @@ static int intel_engine_setup(struct intel_gt *gt, enum intel_engine_id id,
 	engine->logical_mask = BIT(logical_instance);
 	__sprint_engine_name(engine);
 
-	if ((engine->class == COMPUTE_CLASS && !RCS_MASK(engine->gt) &&
-	     __ffs(CCS_MASK(engine->gt)) == engine->instance) ||
-	     engine->class == RENDER_CLASS)
+	if ((engine->class == COMPUTE_CLASS || engine->class == RENDER_CLASS) &&
+	    __ffs(CCS_MASK(engine->gt) | RCS_MASK(engine->gt)) == engine->instance)
 		engine->flags |= I915_ENGINE_FIRST_RENDER_COMPUTE;
 
 	/* features common between engines sharing EUs */

drivers/gpu/drm/i915/gt/uc/intel_guc.c

@@ -315,10 +315,6 @@ static u32 guc_ctl_wa_flags(struct intel_guc *guc)
 	if (IS_DG2_G11(gt->i915))
 		flags |= GUC_WA_CONTEXT_ISOLATION;
 
-	/* Wa_16015675438 */
-	if (!RCS_MASK(gt))
-		flags |= GUC_WA_RCS_REGS_IN_CCS_REGS_LIST;
-
 	/* Wa_14018913170 */
 	if (GUC_FIRMWARE_VER(guc) >= MAKE_GUC_VER(70, 7, 0)) {
 		if (IS_DG2(gt->i915) || IS_METEORLAKE(gt->i915))