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

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Message-ID: <CAE-0n52kAq4=Cbdjg8JFVJ9a9ww-cLkUwcJ4BNBP9McXeaSxeQ@mail.gmail.com>
Date: Sun, 28 Jul 2024 17:37:51 -0700
From: Stephen Boyd <swboyd@...omium.org>
To: Abhinav Kumar <quic_abhinavk@...cinc.com>, Daniel Vetter <daniel@...ll.ch>, 
	David Airlie <airlied@...il.com>, Dmitry Baryshkov <dmitry.baryshkov@...aro.org>, 
	Kuogee Hsieh <quic_khsieh@...cinc.com>, Marijn Suijten <marijn.suijten@...ainline.org>, 
	Rob Clark <robdclark@...il.com>, Sean Paul <sean@...rly.run>, freedreno@...ts.freedesktop.org
Cc: dri-devel@...ts.freedesktop.org, quic_jesszhan@...cinc.com, 
	neil.armstrong@...aro.org, abel.vesa@...aro.org, 
	Rob Clark <robdclark@...omium.org>, linux-arm-msm@...r.kernel.org, 
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] drm/msm/dp: reset the link phy params before link training

Quoting Abhinav Kumar (2024-07-25 15:04:50)
> 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>
> ---

Reviewed-by: Stephen Boyd <swboyd@...omium.org>