From c9193f8f491ef9c385afcd48d58f87e028250a74 Mon Sep 17 00:00:00 2001
From: liangzhen <zhen.liang@spacemit.com>
Date: Thu, 4 Sep 2025 16:49:07 +0800
Subject: [PATCH] target/riscv: hard reset DTM if dmistat is busy

Due to certain reasons, the DMI scan is busy,
leading to a timeout and exit. When restarting
OpenCD, a hard reset of the DTM is required.
---
 src/target/riscv/riscv-013.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/src/target/riscv/riscv-013.c b/src/target/riscv/riscv-013.c
index b5c6bfb07..f1a297a97 100644
--- a/src/target/riscv/riscv-013.c
+++ b/src/target/riscv/riscv-013.c
@@ -2016,6 +2016,12 @@ static int examine(struct target *target)
 		return ERROR_FAIL;
 	}
 
+	if (get_field(dtmcontrol, DTM_DTMCS_DMISTAT) != DTM_DMI_OP_SUCCESS) {
+		if (dtmcs_scan(target->tap, DTM_DTMCS_DTMHARDRESET,
+				NULL /* discard result */) != ERROR_OK)
+			return ERROR_FAIL;
+	}
+
 	riscv013_info_t *info = get_info(target);
 
 	info->index = target->coreid;