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From:   Stephen Boyd <swboyd@chromium.org>
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Date:   Fri, 14 Jan 2022 14:41:48 -0600
Message-ID: <CAE-0n52UntroUk9hzPorUOvkVty1=V5B2oznYghi_DM6=zyzrw@mail.gmail.com>
Subject: Re: [PATCH v14 1/4] drm/msm/dp: do not initialize phy until plugin
 interrupt received
To:     Kuogee Hsieh <quic_khsieh@quicinc.com>, agross@kernel.org,
        airlied@linux.ie, bjorn.andersson@linaro.org, daniel@ffwll.ch,
        dmitry.baryshkov@linaro.org, dri-devel@lists.freedesktop.org,
        robdclark@gmail.com, sean@poorly.run, vkoul@kernel.org
Cc:     quic_abhinavk@quicinc.com, aravindh@codeaurora.org,
        quic_sbillaka@quicinc.com, freedreno@lists.freedesktop.org,
        linux-arm-msm@vger.kernel.org, linux-kernel@vger.kernel.org
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Quoting Kuogee Hsieh (2022-01-14 09:54:31)
> diff --git a/drivers/gpu/drm/msm/dp/dp_display.c b/drivers/gpu/drm/msm/dp/dp_display.c
> index 7cc4d21..2616f7b 100644
> --- a/drivers/gpu/drm/msm/dp/dp_display.c
> +++ b/drivers/gpu/drm/msm/dp/dp_display.c
> @@ -372,21 +373,38 @@ static int dp_display_process_hpd_high(struct dp_display_private *dp)
>         return rc;
>  }
>
> -static void dp_display_host_init(struct dp_display_private *dp, int reset)
> +static void dp_display_host_phy_init(struct dp_display_private *dp)
>  {
> -       bool flip = false;
> +       DRM_DEBUG_DP("core_init=%d phy_init=%d\n",
> +                       dp->core_initialized, dp->phy_initialized);
>
> +       if (!dp->phy_initialized) {
> +               dp_ctrl_phy_init(dp->ctrl);
> +               dp->phy_initialized = true;
> +       }
> +}
> +
> +static void dp_display_host_phy_exit(struct dp_display_private *dp)
> +{
> +       DRM_DEBUG_DP("core_init=%d phy_init=%d\n",
> +                       dp->core_initialized, dp->phy_initialized);
> +
> +       if (dp->phy_initialized) {
> +               dp_ctrl_phy_exit(dp->ctrl);
> +               dp->phy_initialized = false;
> +       }
> +}
> +
> +static void dp_display_host_init(struct dp_display_private *dp)
> +{
>         DRM_DEBUG_DP("core_initialized=%d\n", dp->core_initialized);
>         if (dp->core_initialized) {

Can you remove this if condition too? I don't see how it ever happens.

>                 DRM_DEBUG_DP("DP core already initialized\n");
>                 return;
>         }
>
> -       if (dp->usbpd->orientation == ORIENTATION_CC2)
> -               flip = true;
> -
> -       dp_power_init(dp->power, flip);
> -       dp_ctrl_host_init(dp->ctrl, flip, reset);
> +       dp_power_init(dp->power, false);
> +       dp_ctrl_reset_irq_ctrl(dp->ctrl, true);
>         dp_aux_init(dp->aux);
>         dp->core_initialized = true;
>  }