1 files changed, 34 insertions, 0 deletions
diff --git a/src/soc/mediatek/mt8183/mtcmos.c b/src/soc/mediatek/mt8183/mtcmos.c
new file mode 100644
index 0000000000..1c0d7aba7d
--- /dev/null
+++ b/src/soc/mediatek/mt8183/mtcmos.c
@@ -0,0 +1,34 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright 2018 MediaTek Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <arch/io.h>
+#include <soc/infracfg.h>
+#include <soc/smi.h>
+#include <soc/mtcmos.h>
+
+enum {
+	DISP_PROT_STEP1_0_MASK	= 0x3 << 16,
+	DISP_PROT_STEP2_0_MASK	= 0x3 << 10,
+	DISP_PROT_STEP2_1_MASK	= 0xff,
+};
+
+void mtcmos_protect_display_bus(void)
+{
+	write32(&mt8183_infracfg->infra_topaxi_protecten_clr,
+		DISP_PROT_STEP2_0_MASK);
+	write32(&mt8183_smi->smi_common_clamp_en_clr, DISP_PROT_STEP2_1_MASK);
+	write32(&mt8183_infracfg->infra_topaxi_protecten_1_clr,
+		DISP_PROT_STEP1_0_MASK);
+}