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From 45be44a0f066d38f9fa9075cd161dc3102f49eee Mon Sep 17 00:00:00 2001
From: Samson Tam <Samson.Tam@amd.com>
Date: Mon, 30 Jul 2018 12:22:35 -0400
Subject: [PATCH 5176/5725] drm/amd/display: Do not retain link settings
Do not retrain link settings if lane count and link rate are both
unknown. Causes driver to be stuck reading VBIOS register after
removing emulated connection.
Signed-off-by: Samson Tam <Samson.Tam@amd.com>
Reviewed-by: Anthony Koo <Anthony.Koo@amd.com>
Acked-by: Bhawanpreet Lakha <Bhawanpreet.Lakha@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
---
drivers/gpu/drm/amd/display/dc/core/dc.c | 15 +++++++++++++--
1 file changed, 13 insertions(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/amd/display/dc/core/dc.c b/drivers/gpu/drm/amd/display/dc/core/dc.c
index 16beef9..8f4a288 100644
--- a/drivers/gpu/drm/amd/display/dc/core/dc.c
+++ b/drivers/gpu/drm/amd/display/dc/core/dc.c
@@ -52,6 +52,8 @@
#include "dm_helpers.h"
#include "mem_input.h"
#include "hubp.h"
+
+#include "dc_link_dp.h"
#define DC_LOGGER \
dc->ctx->logger
@@ -434,8 +436,17 @@ void dc_link_set_preferred_link_settings(struct dc *dc,
struct dc_link_settings *link_setting,
struct dc_link *link)
{
- link->preferred_link_setting = *link_setting;
- dp_retrain_link_dp_test(link, link_setting, false);
+ struct dc_link_settings store_settings = *link_setting;
+ struct dc_stream_state *link_stream =
+ link->dc->current_state->res_ctx.pipe_ctx[0].stream;
+
+ link->preferred_link_setting = store_settings;
+ if (link_stream)
+ decide_link_settings(link_stream, &store_settings);
+
+ if ((store_settings.lane_count != LANE_COUNT_UNKNOWN) &&
+ (store_settings.link_rate != LINK_RATE_UNKNOWN))
+ dp_retrain_link_dp_test(link, &store_settings, false);
}
void dc_link_enable_hpd(const struct dc_link *link)
--
2.7.4
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