linux-kernel - Re: [PATCH] drm/msm/dp: stop link training after link training 2 failed

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Message-ID: <CAE-0n51FHOks2mF1tNxzEt7Hqz03in0KHRx8_49SGk-0F34Cvg@mail.gmail.com>
Date:   Wed, 5 Jan 2022 13:16:26 -0800
From:   Stephen Boyd <swboyd@...omium.org>
To:     Kuogee Hsieh <quic_khsieh@...cinc.com>, agross@...nel.org,
        airlied@...ux.ie, bjorn.andersson@...aro.org, daniel@...ll.ch,
        dmitry.baryshkov@...aro.org, robdclark@...il.com, sean@...rly.run,
        vkoul@...nel.org
Cc:     quic_abhinavk@...cinc.com, aravindh@...eaurora.org,
        quic_sbillaka@...cinc.com, freedreno@...ts.freedesktop.org,
        dri-devel@...ts.freedesktop.org, linux-arm-msm@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] drm/msm/dp: stop link training after link training 2 failed

Quoting Kuogee Hsieh (2022-01-04 15:52:07)
> Each DP link training contains link training 1 followed by link
> training 2.  There is maximum of 5 retries of DP link training
> before declared link training failed. It is required to stop link
> training at end of link training 2 if it is failed so that next
> link training 1 can start freshly. This patch fixes link compliance
> test  case 4.3.1.13 (Source Device Link Training EQ Fallback Test).
>
> Fixes: 2e0adc765d88 ("drm/msm/dp: do not end dp link training until video is ready")
> Signed-off-by: Kuogee Hsieh <quic_khsieh@...cinc.com>
> ---

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