lib/i915/perf: configure OA timestamp shift and mask for ACM

OA reports have the timestamp value shifted to the right by 1 bits, it
also means we cannot use the top bit for comparison. Configure OA
timestamp shift and mask for ACM.

Signed-off-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Reviewed-by: Umesh Nerlige Ramappa <umesh.nerlige.ramappa@intel.com>

lib/i915/perf.c

@@ -377,6 +377,12 @@ intel_perf_for_devinfo(uint32_t device_id,
 		intel_perf_load_metrics_adl(perf);
 	} else if (devinfo->is_dg2) {
 		perf->devinfo.eu_threads_count = 8;
+		/* OA reports have the timestamp value shifted to the
+		 * right by 1 bits, it also means we cannot use the
+		 * top bit for comparison.
+		 */
+		perf->devinfo.oa_timestamp_shift = -1;
+		perf->devinfo.oa_timestamp_mask = 0x7fffffff;
 
 		if (is_acm_gt1(&perf->devinfo))
 			intel_perf_load_metrics_acmgt1(perf);