From: Harry Wentland <harry.wentland@amd.com>
Date: Fri, 23 Mar 2018 13:39:27 -0400
Subject: drm/amd/display: Implement dm_get_timestamp
Git-commit: 4c61af8afe855fcf65a09d47c8e330bb1fd1fb4a
Patch-mainline: v4.18-rc1
References: FATE#326289 FATE#326079 FATE#326049 FATE#322398 FATE#326166

We use this to ensure we wait at least 500ms in between eDP
disable/enable.

Signed-off-by: Harry Wentland <harry.wentland@amd.com>
Reviewed-by: Tony Cheng <Tony.Cheng@amd.com>
Acked-by: Harry Wentland <harry.wentland@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Acked-by: Petr Tesarik <ptesarik@suse.com>
---
 drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_services.c |    6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_services.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_services.c
@@ -37,8 +37,10 @@
 
 unsigned long long dm_get_timestamp(struct dc_context *ctx)
 {
-	/* TODO: return actual timestamp */
-	return 0;
+	struct timespec64 time;
+
+	getrawmonotonic64(&time);
+	return timespec64_to_ns(&time);
 }
 
 void dm_perf_trace_timestamp(const char *func_name, unsigned int line)