media: amphion: handle firmware debug message

decoder firmware may notify host some debug message,
it can help analyze the state of the firmware in case of error

Fixes: 9f599f35 ("media: amphion: add vpu core driver")
Signed-off-by: Ming Qian <ming.qian@nxp.com>
Reviewed-by: Nicolas Dufresne <nicolas.dufresne@collabora.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>

drivers/media/platform/amphion/vpu_defs.h

@@ -71,6 +71,7 @@ enum {
 	VPU_MSG_ID_TIMESTAMP_INFO,
 	VPU_MSG_ID_FIRMWARE_XCPT,
 	VPU_MSG_ID_PIC_SKIPPED,
+	VPU_MSG_ID_DBG_MSG,
 };
 
 enum VPU_ENC_MEMORY_RESOURSE {

drivers/media/platform/amphion/vpu_helpers.c

@@ -489,6 +489,7 @@ const char *vpu_id_name(u32 id)
 	case VPU_MSG_ID_UNSUPPORTED: return "unsupported";
 	case VPU_MSG_ID_FIRMWARE_XCPT: return "exception";
 	case VPU_MSG_ID_PIC_SKIPPED: return "skipped";
+	case VPU_MSG_ID_DBG_MSG: return "debug msg";
 	}
 	return "<unknown>";
 }

drivers/media/platform/amphion/vpu_malone.c

@@ -745,6 +745,7 @@ static struct vpu_pair malone_msgs[] = {
 	{VPU_MSG_ID_UNSUPPORTED, VID_API_EVENT_UNSUPPORTED_STREAM},
 	{VPU_MSG_ID_FIRMWARE_XCPT, VID_API_EVENT_FIRMWARE_XCPT},
 	{VPU_MSG_ID_PIC_SKIPPED, VID_API_EVENT_PIC_SKIPPED},
+	{VPU_MSG_ID_DBG_MSG, VID_API_EVENT_DBG_MSG_DEC},
 };
 
 static void vpu_malone_pack_fs_alloc(struct vpu_rpc_event *pkt,

drivers/media/platform/amphion/vpu_msgs.c

@@ -23,6 +23,7 @@
 struct vpu_msg_handler {
 	u32 id;
 	void (*done)(struct vpu_inst *inst, struct vpu_rpc_event *pkt);
+	u32 is_str;
 };
 
 static void vpu_session_handle_start_done(struct vpu_inst *inst, struct vpu_rpc_event *pkt)
@@ -154,7 +155,7 @@ static void vpu_session_handle_error(struct vpu_inst *inst, struct vpu_rpc_event
 {
 	char *str = (char *)pkt->data;
 
-	if (strlen(str))
+	if (*str)
 		dev_err(inst->dev, "instance %d firmware error : %s\n", inst->id, str);
 	else
 		dev_err(inst->dev, "instance %d is unsupported stream\n", inst->id);
@@ -180,6 +181,21 @@ static void vpu_session_handle_pic_skipped(struct vpu_inst *inst, struct vpu_rpc
 	vpu_inst_unlock(inst);
 }
 
+static void vpu_session_handle_dbg_msg(struct vpu_inst *inst, struct vpu_rpc_event *pkt)
+{
+	char *str = (char *)pkt->data;
+
+	if (*str)
+		dev_info(inst->dev, "instance %d firmware dbg msg : %s\n", inst->id, str);
+}
+
+static void vpu_terminate_string_msg(struct vpu_rpc_event *pkt)
+{
+	if (pkt->hdr.num == ARRAY_SIZE(pkt->data))
+		pkt->hdr.num--;
+	pkt->data[pkt->hdr.num] = 0;
+}
+
 static struct vpu_msg_handler handlers[] = {
 	{VPU_MSG_ID_START_DONE, vpu_session_handle_start_done},
 	{VPU_MSG_ID_STOP_DONE, vpu_session_handle_stop_done},
@@ -193,9 +209,10 @@ static struct vpu_msg_handler handlers[] = {
 	{VPU_MSG_ID_PIC_DECODED, vpu_session_handle_pic_decoded},
 	{VPU_MSG_ID_DEC_DONE, vpu_session_handle_pic_done},
 	{VPU_MSG_ID_PIC_EOS, vpu_session_handle_eos},
-	{VPU_MSG_ID_UNSUPPORTED, vpu_session_handle_error},
-	{VPU_MSG_ID_FIRMWARE_XCPT, vpu_session_handle_firmware_xcpt},
+	{VPU_MSG_ID_UNSUPPORTED, vpu_session_handle_error, true},
+	{VPU_MSG_ID_FIRMWARE_XCPT, vpu_session_handle_firmware_xcpt, true},
 	{VPU_MSG_ID_PIC_SKIPPED, vpu_session_handle_pic_skipped},
+	{VPU_MSG_ID_DBG_MSG, vpu_session_handle_dbg_msg, true},
 };
 
 static int vpu_session_handle_msg(struct vpu_inst *inst, struct vpu_rpc_event *msg)
@@ -219,8 +236,12 @@ static int vpu_session_handle_msg(struct vpu_inst *inst, struct vpu_rpc_event *m
 		}
 	}
 
-	if (handler && handler->done)
-		handler->done(inst, msg);
+	if (handler) {
+		if (handler->is_str)
+			vpu_terminate_string_msg(msg);
+		if (handler->done)
+			handler->done(inst, msg);
+	}
 
 	vpu_response_cmd(inst, msg_id, 1);