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

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Message-ID: <CAA8EJppFcPRcMzjB8hxbWK9G19J-C720DP7gukW3ds8j-Af92w@mail.gmail.com>
Date: Sat, 27 Jul 2024 15:46:59 +0300
From: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To: Abhinav Kumar <quic_abhinavk@...cinc.com>
Cc: freedreno@...ts.freedesktop.org, Rob Clark <robdclark@...il.com>, 
	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>, 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: Re: [PATCH] drm/msm/dp: reset the link phy params before link training

On Fri, 26 Jul 2024 at 01:05, Abhinav Kumar <quic_abhinavk@...cinc.com> wrote:
>
> 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: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
Tested-by: Dmitry Baryshkov <dmitry.baryshkov@...aro.org> # SM8350-HDK

-- 
With best wishes
Dmitry