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From 4617b27b7d395c4b7c885030e6b41623ddd5581f Mon Sep 17 00:00:00 2001
From: Mykola Lysenko <Mykola.Lysenko@amd.com>
Date: Thu, 3 Dec 2015 19:22:04 +0800
Subject: [PATCH 0572/1110] drm/amd/dal: temporary fix for MST chaing
disconnect
Unplug of MST chain happened (two displays),
payload allocation table is empty on first reset mode,
and cause 0 division in avg_time_slots_per_mtp calculation
Signed-off-by: Harry Wentland <harry.wentland@amd.com>
Acked-by: Harry Wentland <harry.wentland@amd.com>
---
drivers/gpu/drm/amd/dal/dc/core/dc_link.c | 9 +++++++++
1 file changed, 9 insertions(+)
diff --git a/drivers/gpu/drm/amd/dal/dc/core/dc_link.c b/drivers/gpu/drm/amd/dal/dc/core/dc_link.c
index 44b3a2b..8dc3af2 100644
--- a/drivers/gpu/drm/amd/dal/dc/core/dc_link.c
+++ b/drivers/gpu/drm/amd/dal/dc/core/dc_link.c
@@ -1116,6 +1116,15 @@ static enum dc_status allocate_mst_payload(struct core_stream *stream)
&table,
true);
+ /*
+ * temporary fix. Unplug of MST chain happened (two displays),
+ * table is empty on first reset mode, and cause 0 division in
+ * avg_time_slots_per_mtp calculation
+ */
+
+ if (table.stream_count == 0)
+ return DC_OK;
+
/* program DP source TX for payload */
dc->hwss.update_mst_stream_allocation_table(
link_encoder,
--
2.7.4
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