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From 0539d41c3ed519649dac887faff333a06096e6ff Mon Sep 17 00:00:00 2001
From: Hersen Wu <hersenxs.wu@amd.com>
Date: Fri, 9 Feb 2018 16:35:14 -0500
Subject: [PATCH 3628/4131] drm/amd/display: move MST branch initialize to
before link training
some MST capable scaler doesn't like recieving CLEAR_PAYLOAD_ID_TABLE after
link training. move branch initialize to before link training
Signed-off-by: Hersen Wu <hersenxs.wu@amd.com>
Signed-off-by: Tony Cheng <tony.cheng@amd.com>
Reviewed-by: Tony Cheng <Tony.Cheng@amd.com>
Acked-by: Harry Wentland <harry.wentland@amd.com>
---
drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_helpers.c | 9 +++++++++
drivers/gpu/drm/amd/display/dc/core/dc_link.c | 3 +++
drivers/gpu/drm/amd/display/dc/dm_helpers.h | 7 +++++++
3 files changed, 19 insertions(+)
diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_helpers.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_helpers.c
index 9bd142f..3e157e6 100644
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_helpers.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_helpers.c
@@ -258,6 +258,15 @@ bool dm_helpers_dp_mst_write_payload_allocation_table(
return true;
}
+
+/*
+ * Clear payload allocation table before enable MST DP link.
+ */
+void dm_helpers_dp_mst_clear_payload_allocation_table(
+ struct dc_context *ctx,
+ const struct dc_link *link)
+{}
+
/*
* Polls for ACT (allocation change trigger) handled and sends
* ALLOCATE_PAYLOAD message.
diff --git a/drivers/gpu/drm/amd/display/dc/core/dc_link.c b/drivers/gpu/drm/amd/display/dc/core/dc_link.c
index 95955ade..f40c9c7 100644
--- a/drivers/gpu/drm/amd/display/dc/core/dc_link.c
+++ b/drivers/gpu/drm/amd/display/dc/core/dc_link.c
@@ -1311,6 +1311,9 @@ static enum dc_status enable_link_dp_mst(
if (link->cur_link_settings.lane_count != LANE_COUNT_UNKNOWN)
return DC_OK;
+ /* clear payload table */
+ dm_helpers_dp_mst_clear_payload_allocation_table(link->ctx, link);
+
/* set the sink to MST mode before enabling the link */
dp_enable_mst_on_sink(link, true);
diff --git a/drivers/gpu/drm/amd/display/dc/dm_helpers.h b/drivers/gpu/drm/amd/display/dc/dm_helpers.h
index ab88f07..53d5566 100644
--- a/drivers/gpu/drm/amd/display/dc/dm_helpers.h
+++ b/drivers/gpu/drm/amd/display/dc/dm_helpers.h
@@ -50,6 +50,13 @@ bool dm_helpers_dp_mst_write_payload_allocation_table(
bool enable);
/*
+ * Clear payload allocation table before enable MST DP link.
+ */
+void dm_helpers_dp_mst_clear_payload_allocation_table(
+ struct dc_context *ctx,
+ const struct dc_link *link);
+
+/*
* Polls for ACT (allocation change trigger) handled and
*/
bool dm_helpers_dp_mst_poll_for_allocation_change_trigger(
--
2.7.4
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