linux-kernel - Re: [PATCH v4 3/7] drm/msm/dp: Allow specifying connector

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Date:   Tue, 5 Oct 2021 17:15:32 -0700
From:   Stephen Boyd <swboyd@...omium.org>
To:     Abhinav Kumar <abhinavk@...eaurora.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Daniel Vetter <daniel@...ll.ch>,
        David Airlie <airlied@...ux.ie>,
        Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
        Kalyan Thota <kalyan_t@...eaurora.org>,
        Kuogee Hsieh <khsieh@...eaurora.org>,
        Rob Clark <robdclark@...il.com>, Sean Paul <sean@...rly.run>
Cc:     Rob Herring <robh+dt@...nel.org>, linux-arm-msm@...r.kernel.org,
        dri-devel@...ts.freedesktop.org, freedreno@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 3/7] drm/msm/dp: Allow specifying connector_type per controller

Quoting Bjorn Andersson (2021-10-05 16:13:19)
> diff --git a/drivers/gpu/drm/msm/dp/dp_display.c b/drivers/gpu/drm/msm/dp/dp_display.c
> index 5d3ee5ef07c2..eaf08f9e7d87 100644
> --- a/drivers/gpu/drm/msm/dp/dp_display.c
> +++ b/drivers/gpu/drm/msm/dp/dp_display.c
> @@ -115,8 +115,25 @@ struct dp_display_private {
>         struct dp_audio *audio;
>  };
>
> +struct msm_dp_desc {
> +       phys_addr_t io_start;
> +       int connector_type;
> +};
> +
> +struct msm_dp_config {
> +       struct msm_dp_desc *descs;

const?

> +       size_t num_descs;
> +};
> +
> +static const struct msm_dp_config sc7180_dp_cfg = {
> +       .descs = (struct msm_dp_desc[]) {

const?

> +               { .io_start = 0x0ae90000, .connector_type = DRM_MODE_CONNECTOR_DisplayPort },
> +       },
> +       .num_descs = 1,
> +};
> +
>  static const struct of_device_id dp_dt_match[] = {
> -       {.compatible = "qcom,sc7180-dp"},
> +       { .compatible = "qcom,sc7180-dp", .data = &sc7180_dp_cfg },
>         {}
>  };
>
> @@ -1180,10 +1197,29 @@ int dp_display_request_irq(struct msm_dp *dp_display)
>         return 0;
>  }
>
> +static struct msm_dp_desc *dp_display_get_desc(struct platform_device *pdev)

const msm_dp_desc?

> +{
> +       const struct msm_dp_config *cfg = of_device_get_match_data(&pdev->dev);
> +       struct resource *res;
> +       int i;
> +
> +       res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> +       if (!res)
> +               return NULL;
> +
> +       for (i = 0; i < cfg->num_descs; i++)
> +               if (cfg->descs[i].io_start == res->start)
> +                       return &cfg->descs[i];
> +
> +       dev_err(&pdev->dev, "unknown displayport instance\n");
> +       return NULL;
> +}
> +
>  static int dp_display_probe(struct platform_device *pdev)
>  {
>         int rc = 0;
>         struct dp_display_private *dp;
> +       struct msm_dp_desc *desc;

const?

>
>         if (!pdev || !pdev->dev.of_node) {
>                 DRM_ERROR("pdev not found\n");
> @@ -1194,8 +1230,13 @@ static int dp_display_probe(struct platform_device *pdev)
>         if (!dp)
>                 return -ENOMEM;
>
> +       desc = dp_display_get_desc(pdev);
> +       if (!desc)
> +               return -EINVAL;
> +
>         dp->pdev = pdev;
>         dp->name = "drm_dp";
> +       dp->dp_display.connector_type = desc->connector_type;
>
>         rc = dp_init_sub_modules(dp);
>         if (rc) {