linux-kernel - [PATCH] drm/msm/dp: reset the link phy params before link training

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Message-ID: <20240725220450.131245-1-quic_abhinavk@quicinc.com>
Date: Thu, 25 Jul 2024 15:04:50 -0700
From: Abhinav Kumar <quic_abhinavk@...cinc.com>
To: <freedreno@...ts.freedesktop.org>, Rob Clark <robdclark@...il.com>,
        Abhinav Kumar <quic_abhinavk@...cinc.com>,
        Dmitry Baryshkov
	<dmitry.baryshkov@...aro.org>,
        Sean Paul <sean@...rly.run>,
        Marijn Suijten
	<marijn.suijten@...ainline.org>,
        David Airlie <airlied@...il.com>, "Daniel
 Vetter" <daniel@...ll.ch>,
        Kuogee Hsieh <quic_khsieh@...cinc.com>
CC: <dri-devel@...ts.freedesktop.org>, <quic_jesszhan@...cinc.com>,
        <neil.armstrong@...aro.org>, <swboyd@...omium.org>,
        <abel.vesa@...aro.org>, Rob Clark <robdclark@...omium.org>,
        <linux-arm-msm@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: [PATCH] drm/msm/dp: reset the link phy params before link training

Before re-starting link training reset the link phy params namely
the pre-emphasis and voltage swing levels otherwise the next
link training begins at the previously cached levels which can result
in link training failures.

Fixes: 8ede2ecc3e5e ("drm/msm/dp: Add DP compliance tests on Snapdragon Chipsets")
Signed-off-by: Abhinav Kumar <quic_abhinavk@...cinc.com>
---
 drivers/gpu/drm/msm/dp/dp_ctrl.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/gpu/drm/msm/dp/dp_ctrl.c b/drivers/gpu/drm/msm/dp/dp_ctrl.c
index cdfcb54a3618..c7a89ab21e09 100644
--- a/drivers/gpu/drm/msm/dp/dp_ctrl.c
+++ b/drivers/gpu/drm/msm/dp/dp_ctrl.c
@@ -1286,6 +1286,8 @@ static int dp_ctrl_link_train(struct dp_ctrl_private *ctrl,
 	link_info.rate = ctrl->link->link_params.rate;
 	link_info.capabilities = DP_LINK_CAP_ENHANCED_FRAMING;
 
+	dp_link_reset_phy_params_vx_px(ctrl->link);
+
 	dp_aux_link_configure(ctrl->aux, &link_info);
 
 	if (drm_dp_max_downspread(dpcd))
-- 
2.44.0