1 files changed, 47 insertions, 0 deletions
diff --git a/drivers/gpu/drm/amd/display/dc/link/protocols/link_hpd.h b/drivers/gpu/drm/amd/display/dc/link/protocols/link_hpd.h
new file mode 100644
index 000000000000..3d122def0c88
--- /dev/null
+++ b/drivers/gpu/drm/amd/display/dc/link/protocols/link_hpd.h
@@ -0,0 +1,47 @@
+/*
+ * Copyright 2022 Advanced Micro Devices, Inc.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
+ * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+ * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ * Authors: AMD
+ *
+ */
+
+
+#ifndef __DC_LINK_HPD_H__
+#define __DC_LINK_HPD_H__
+#include "link.h"
+
+enum hpd_source_id get_hpd_line(struct dc_link *link);
+/*
+ *  Function: program_hpd_filter
+ *
+ *  @brief
+ *     Programs HPD filter on associated HPD line to default values.
+ *
+ *  @return
+ *     true on success, false otherwise
+ */
+bool program_hpd_filter(const struct dc_link *link);
+/* Query hot plug status of USB4 DP tunnel.
+ * Returns true if HPD high.
+ */
+bool dpia_query_hpd_status(struct dc_link *link);
+bool query_hpd_status(struct dc_link *link, uint32_t *is_hpd_high);
+#endif /* __DC_LINK_HPD_H__ */