linux-kernel - Re: [PATCH v3] drm/msm/dp: add support of tps4 (training pattern 4) for HBR3

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Message-ID: <CAE-0n52-SL6jPVtn_wEPtY1FQ4EUZ2PhiQ=agXcnA0AHPV9TQQ@mail.gmail.com>
Date:   Thu, 6 Jan 2022 16:16:07 -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, Kuogee Hsieh <khsieh@...eaurora.org>
Subject: Re: [PATCH v3] drm/msm/dp: add support of tps4 (training pattern 4)
 for HBR3

Quoting Kuogee Hsieh (2022-01-06 09:14:56)
> @@ -1189,12 +1190,20 @@ static int dp_ctrl_link_train_2(struct dp_ctrl_private *ctrl,
>
>         *training_step = DP_TRAINING_2;
>
> -       if (drm_dp_tps3_supported(ctrl->panel->dpcd))
> +       if (drm_dp_tps4_supported(ctrl->panel->dpcd)) {
> +               pattern = DP_TRAINING_PATTERN_4;
> +               state_ctrl_bit = 4;
> +       }
> +       else if (drm_dp_tps3_supported(ctrl->panel->dpcd)) {

also

	} else if (...) {