diff --git a/tools/perf/tests/shell/test_arm_coresight.sh b/tools/perf/tests/shell/test_arm_coresight.sh
index 18fde2f179cd..59b647455ec6 100755
--- a/tools/perf/tests/shell/test_arm_coresight.sh
+++ b/tools/perf/tests/shell/test_arm_coresight.sh
@@ -33,7 +33,7 @@ record_touch_file() {
 	echo "Recording trace (only user mode) with path: CPU$2 => $1"
 	rm -f $file
 	perf record -o ${perfdata} -e cs_etm/@$1/u --per-thread \
-		-- taskset -c $2 touch $file
+		-- taskset -c $2 touch $file > /dev/null 2>&1
 }
 
 perf_script_branch_samples() {
@@ -43,8 +43,8 @@ perf_script_branch_samples() {
 	#   touch  6512          1         branches:u:      ffffb220824c strcmp+0xc (/lib/aarch64-linux-gnu/ld-2.27.so)
 	#   touch  6512          1         branches:u:      ffffb22082e0 strcmp+0xa0 (/lib/aarch64-linux-gnu/ld-2.27.so)
 	#   touch  6512          1         branches:u:      ffffb2208320 strcmp+0xe0 (/lib/aarch64-linux-gnu/ld-2.27.so)
-	perf script -F,-time -i ${perfdata} | \
-		egrep " +$1 +[0-9]+ .* +branches:(.*:)? +"
+	perf script -F,-time -i ${perfdata} 2>&1 | \
+		egrep " +$1 +[0-9]+ .* +branches:(.*:)? +" > /dev/null 2>&1
 }
 
 perf_report_branch_samples() {
@@ -54,8 +54,8 @@ perf_report_branch_samples() {
 	#   73.04%    73.04%  touch    libc-2.27.so      [.] _dl_addr
 	#    7.71%     7.71%  touch    libc-2.27.so      [.] getenv
 	#    2.59%     2.59%  touch    ld-2.27.so        [.] strcmp
-	perf report --stdio -i ${perfdata} | \
-		egrep " +[0-9]+\.[0-9]+% +[0-9]+\.[0-9]+% +$1 "
+	perf report --stdio -i ${perfdata} 2>&1 | \
+		egrep " +[0-9]+\.[0-9]+% +[0-9]+\.[0-9]+% +$1 " > /dev/null 2>&1
 }
 
 perf_report_instruction_samples() {
@@ -65,8 +65,8 @@ perf_report_instruction_samples() {
 	#   68.12%  touch    libc-2.27.so   [.] _dl_addr
 	#    5.80%  touch    libc-2.27.so   [.] getenv
 	#    4.35%  touch    ld-2.27.so     [.] _dl_fixup
-	perf report --itrace=i1000i --stdio -i ${perfdata} | \
-		egrep " +[0-9]+\.[0-9]+% +$1"
+	perf report --itrace=i1000i --stdio -i ${perfdata} 2>&1 | \
+		egrep " +[0-9]+\.[0-9]+% +$1" > /dev/null 2>&1
 }
 
 is_device_sink() {
@@ -129,9 +129,6 @@ arm_cs_etm_traverse_path_test() {
 		# Find the ETM device belonging to which CPU
 		cpu=`cat $dev/cpu`
 
-		echo $dev
-		echo $cpu
-
 		# Use depth-first search (DFS) to iterate outputs
 		arm_cs_iterate_devices $dev $cpu
 	done
@@ -139,7 +136,7 @@ arm_cs_etm_traverse_path_test() {
 
 arm_cs_etm_system_wide_test() {
 	echo "Recording trace with system wide mode"
-	perf record -o ${perfdata} -e cs_etm// -a -- ls
+	perf record -o ${perfdata} -e cs_etm// -a -- ls > /dev/null 2>&1
 
 	perf_script_branch_samples perf &&
 	perf_report_branch_samples perf &&
@@ -154,7 +151,7 @@ arm_cs_etm_system_wide_test() {
 arm_cs_etm_snapshot_test() {
 	echo "Recording trace with snapshot mode"
 	perf record -o ${perfdata} -e cs_etm// -S \
-		-- dd if=/dev/zero of=/dev/null &
+		-- dd if=/dev/zero of=/dev/null > /dev/null 2>&1 &
 	PERFPID=$!
 
 	# Wait for perf program