drm/amdgpu: Add DMCU to firmware query interface

DMCU firmware version can be read using the AMDGPU_INFO ioctl
or the amdgpu_firmware_info debugfs entry

Signed-off-by: David Francis <David.Francis@amd.com>
Reviewed-by: Huang Rui <ray.huang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c

@@ -257,6 +257,10 @@ static int amdgpu_firmware_info(struct drm_amdgpu_info_firmware *fw_info,
 		fw_info->ver = adev->psp.asd_fw_version;
 		fw_info->feature = adev->psp.asd_feature_version;
 		break;
+	case AMDGPU_INFO_FW_DMCU:
+		fw_info->ver = adev->dm.dmcu_fw_version;
+		fw_info->feature = 0;
+		break;
 	default:
 		return -EINVAL;
 	}
@@ -1295,6 +1299,14 @@ static int amdgpu_debugfs_firmware_info(struct seq_file *m, void *data)
 	seq_printf(m, "VCN feature version: %u, firmware version: 0x%08x\n",
 		   fw_info.feature, fw_info.ver);
 
+	/* DMCU */
+	query_fw.fw_type = AMDGPU_INFO_FW_DMCU;
+	ret = amdgpu_firmware_info(&fw_info, &query_fw, adev);
+	if (ret)
+		return ret;
+	seq_printf(m, "DMCU feature version: %u, firmware version: 0x%08x\n",
+		   fw_info.feature, fw_info.ver);
+
 
 	seq_printf(m, "VBIOS version: %s\n", ctx->vbios_version);