linux-kernel - Re: [PATCH v3 2/6] drm/msm/dp: reduce link rate if failed at link training 1

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Message-ID: <CAE-0n52xzaGKd=5fdXFnqixekRYHf8pfvcp+K3eEZk=+siPH1w@mail.gmail.com>
Date:   Tue, 10 Aug 2021 14:32:18 -0700
From:   Stephen Boyd <swboyd@...omium.org>
To:     Kuogee Hsieh <khsieh@...eaurora.org>,
        dri-devel@...ts.freedesktop.org, robdclark@...il.com,
        sean@...rly.run
Cc:     abhinavk@...eaurora.org, aravindh@...eaurora.org, airlied@...ux.ie,
        daniel@...ll.ch, bjorn.andersson@...aro.org,
        linux-arm-msm@...r.kernel.org, freedreno@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 2/6] drm/msm/dp: reduce link rate if failed at link
 training 1

Quoting Kuogee Hsieh (2021-08-05 13:44:51)
> Reduce link rate and re start link training if link training 1
> failed due to loss of clock recovery done to fix Link Layer
> CTS case 4.3.1.7.  Also only update voltage and pre-emphasis
> swing level after link training started to fix Link Layer CTS
> case 4.3.1.6.
>
> Changes in V2:
> -- replaced cr_status with link_status[DP_LINK_STATUS_SIZE]
> -- replaced dp_ctrl_any_lane_cr_done() with dp_ctrl_colco_recovery_any_ok()
> -- replaced dp_ctrl_any_ane_cr_lose() with !drm_dp_clock_recovery_ok()
>
> Changes in V3:
> -- return failed if lane_count <= 1
>
> Signed-off-by: Kuogee Hsieh <khsieh@...eaurora.org>
> ---

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