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From 427f0e33f6917ce94cf794568d357bbe66bf4d7f Mon Sep 17 00:00:00 2001
From: Hugo Hu <hugo.hu@amd.com>
Date: Wed, 13 Nov 2019 16:18:09 -0500
Subject: [PATCH 4693/4736] drm/amd/display: Save/restore link setting for
disable phy when link retraining
[Why]
The link setting will be modify after disable phy
and due to DP Compliance Fails.
[How]
Save and resotre link setting for disable link phy when link retraining.
Signed-off-by: Hugo Hu <hugo.hu@amd.com>
Reviewed-by: Wenjing Liu <Wenjing.Liu@amd.com>
Acked-by: Leo Li <sunpeng.li@amd.com>
---
drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c b/drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c
index 486c14e0cd41..015fa0c52746 100644
--- a/drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c
+++ b/drivers/gpu/drm/amd/display/dc/core/dc_link_dp.c
@@ -2788,9 +2788,9 @@ bool dc_link_handle_hpd_rx_irq(struct dc_link *link, union hpd_irq_data *out_hpd
union hpd_irq_data hpd_irq_dpcd_data = { { { {0} } } };
union device_service_irq device_service_clear = { { 0 } };
enum dc_status result;
-
bool status = false;
struct pipe_ctx *pipe_ctx;
+ struct dc_link_settings previous_link_settings;
int i;
if (out_link_loss)
@@ -2873,9 +2873,10 @@ bool dc_link_handle_hpd_rx_irq(struct dc_link *link, union hpd_irq_data *out_hpd
if (pipe_ctx == NULL || pipe_ctx->stream == NULL)
return false;
+ previous_link_settings = link->cur_link_settings;
dp_disable_link_phy(link, pipe_ctx->stream->signal);
- perform_link_training_with_retries(&link->cur_link_settings,
+ perform_link_training_with_retries(&previous_link_settings,
true, LINK_TRAINING_ATTEMPTS,
pipe_ctx,
pipe_ctx->stream->signal);
--
2.17.1
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