drm/i915/pvc: Implement w/a 16016694945

A new PVC-specific workaround has just been added to the BSpec.

BSpec: 64027
Signed-off-by: NGustavo Sousa <gustavo.sousa@intel.com>
Reviewed-by: NMatt Roper <matthew.d.roper@intel.com>
Signed-off-by: NMatt Roper <matthew.d.roper@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220630201407.16770-1-gustavo.sousa@intel.com

drivers/gpu/drm/i915/gt/intel_gt_regs.h

@@ -918,6 +918,10 @@
 #define GEN7_L3CNTLREG1				_MMIO(0xb01c)
 #define   GEN7_WA_FOR_GEN7_L3_CONTROL		0x3C47FF8C
 #define   GEN7_L3AGDIS				(1 << 19)
+
+#define XEHPC_LNCFMISCCFGREG0			_MMIO(0xb01c)
+#define   XEHPC_OVRLSCCC			REG_BIT(0)
+
 #define GEN7_L3CNTLREG2				_MMIO(0xb020)
 
 /* MOCS (Memory Object Control State) registers */

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

@@ -2687,6 +2687,9 @@ general_render_compute_wa_init(struct intel_engine_cs *engine, struct i915_wa_li
 		 * performance guide section.
 		 */
 		wa_write(wal, XEHPC_L3SCRUB, SCRUB_CL_DWNGRADE_SHARED | SCRUB_RATE_4B_PER_CLK);
+
+		/* Wa_16016694945 */
+		wa_masked_en(wal, XEHPC_LNCFMISCCFGREG0, XEHPC_OVRLSCCC);
 	}
 
 	if (IS_XEHPSDV(i915)) {