[PATCH i-g-t 2/3] tests/intel/xe_query: Add debug messsage with calculated refclock

[Lucas De Marchi <lucas.demarchi@intel.com>]

When debugging new hardware, it's useful to check the refclock matches
the expectation. Calculated the expected reflock and print it for quick
check. Eventually this could be a test on its own if the err is stable.

Signed-off-by: Lucas De Marchi <lucas.demarchi@intel.com>
---
 tests/intel/xe_query.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/tests/intel/xe_query.c b/tests/intel/xe_query.c
index 9e0fa93dd..87ddb58bb 100644
--- a/tests/intel/xe_query.c
+++ b/tests/intel/xe_query.c
@@ -708,7 +708,7 @@ __engine_cycles(int fd, struct drm_xe_engine_class_instance *hwe)
 {
 	struct drm_xe_query_engine_cycles ts1 = {};
 	struct drm_xe_query_engine_cycles ts2 = {};
-	uint64_t delta_cpu, delta_cs, delta_delta;
+	uint64_t delta_cpu, delta_cs, delta_delta, calc_freq;
 	unsigned int exec_queue;
 	int i, usable = 0;
 	igt_spin_t *spin;
@@ -770,7 +770,10 @@ __engine_cycles(int fd, struct drm_xe_engine_class_instance *hwe)
 			delta_cs = (((1 << ts2.width) - ts2.engine_cycles) + ts1.engine_cycles) *
 				   NSEC_PER_SEC / eng_ref_clock;
 
-		igt_debug("freq %u Hz\n", eng_ref_clock);
+		calc_freq = (ts2.engine_cycles - ts1.engine_cycles) * NSEC_PER_SEC / delta_cpu;
+
+		igt_debug("freq %u Hz, calc_freq %"PRIu64" Hz, err %.3f%%\n", eng_ref_clock,
+			  calc_freq, fabs((double)calc_freq - eng_ref_clock) * 100 / eng_ref_clock);
 		igt_debug("delta_cpu[%"PRIu64"], delta_cs[%"PRIu64"]\n",
 			  delta_cpu, delta_cs);
 
-- 
2.46.2