target/riscv: avoid unnecessary IR scans

Change-Id: I03feb5c7d72d5aa38f2cc13c4ed30175cffde84a Signed-off-by: Evgeniy Naydanov <[email protected]>
riscv-collab · Sep 6, 2024 · a96a0a4 · a96a0a4
1 parent 3cd99c0
commit a96a0a4
Showing 1 changed file with 3 additions and 0 deletions.
diff --git a/src/target/riscv/riscv-013.c b/src/target/riscv/riscv-013.c
@@ -435,6 +435,9 @@ static void select_dmi(struct target *target)
 		select_dmi_via_bscan(target);
 		return;
 	}
+	if (buf_cmp(target->tap->cur_instr, select_dbus.out_value,
+				target->tap->ir_length) == 0)
+		return;
 	jtag_add_ir_scan(target->tap, &select_dbus, TAP_IDLE);
 }