linux-kernel - Re: [v1] drm/msm: add shutdown support for display platform

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Message-ID: <159070441846.69627.1650074507855844615@swboyd.mtv.corp.google.com>
Date:   Thu, 28 May 2020 15:20:18 -0700
From:   Stephen Boyd <swboyd@...omium.org>
To:     Krishna Manikandan <mkrishn@...eaurora.org>,
        devicetree@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        freedreno@...ts.freedesktop.org, linux-arm-msm@...r.kernel.org
Cc:     Krishna Manikandan <mkrishn@...eaurora.org>,
        linux-kernel@...r.kernel.org, robdclark@...il.com,
        seanpaul@...omium.org, hoegsberg@...omium.org,
        kalyan_t@...eaurora.org, nganji@...eaurora.org, mka@...omium.org
Subject: Re: [v1] drm/msm: add shutdown support for display platform_driver

Quoting Krishna Manikandan (2020-05-28 01:38:23)
> diff --git a/drivers/gpu/drm/msm/msm_drv.c b/drivers/gpu/drm/msm/msm_drv.c
> index e4b750b..7a8953f 100644
> --- a/drivers/gpu/drm/msm/msm_drv.c
> +++ b/drivers/gpu/drm/msm/msm_drv.c
> @@ -1322,6 +1322,18 @@ static int msm_pdev_remove(struct platform_device *pdev)
>         return 0;
>  }
>  
> +static void msm_pdev_shutdown(struct platform_device *pdev)
> +{
> +       struct drm_device *drm = platform_get_drvdata(pdev);
> +
> +       if (!drm) {
> +               DRM_ERROR("Invalid drm device node\n");
> +               return;
> +       }

When would this ever happen? Please drop this useless check.

> +
> +       drm_atomic_helper_shutdown(drm);
> +}
> +
>  static const struct of_device_id dt_match[] = {
>         { .compatible = "qcom,mdp4", .data = (void *)KMS_MDP4 },
>         { .compatible = "qcom,mdss", .data = (void *)KMS_MDP5 },