drm/i915/mtl: WA to clear RDOP clock gating

Workaround implementation to clear RDOP clock gating.

Bspec: 66622
Signed-off-by: Haridhar Kalvala <haridhar.kalvala@intel.com>
Signed-off-by: Radhakrishna Sripada <radhakrishna.sripada@intel.com>
Reviewed-by: Matt Atwood <matthew.s.atwood@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230418220446.2205509-5-radhakrishna.sripada@intel.com

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

@@ -1703,6 +1703,9 @@ xelpg_gt_workarounds_init(struct intel_gt *gt, struct i915_wa_list *wal)
 		/* Wa_18018781329 */
 		wa_mcr_write_or(wal, RENDER_MOD_CTRL, FORCE_MISS_FTLB);
 		wa_mcr_write_or(wal, COMP_MOD_CTRL, FORCE_MISS_FTLB);
+
+		/* Wa_14015795083 */
+		wa_write_clr(wal, GEN7_MISCCPCTL, GEN12_DOP_CLOCK_GATE_RENDER_ENABLE);
 	}
 
 	/*