linux-kernel - Re: [PATCH] drm/mediatek: Implement shutdown

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Message-ID: <CAAOTY_9=87WTtsYhjMKi+t8-ffu0FTw2vokzeVBOSsGsWCznjA@mail.gmail.com>
Date:   Sun, 29 Jan 2023 09:27:43 +0800
From:   Chun-Kuang Hu <chunkuang.hu@...nel.org>
To:     Ricardo Ribalda <ribalda@...omium.org>
Cc:     Philipp Zabel <p.zabel@...gutronix.de>,
        Daniel Vetter <daniel@...ll.ch>,
        Chun-Kuang Hu <chunkuang.hu@...nel.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        David Airlie <airlied@...il.com>,
        linux-mediatek@...ts.infradead.org,
        dri-devel@...ts.freedesktop.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] drm/mediatek: Implement shutdown

Hi, Ricardo:

Ricardo Ribalda <ribalda@...omium.org> 於 2022年11月28日 週一 下午6:42寫道：
>
> Poweroff the device properly, otherwise the device will not come back
> from kexec().
>
> Signed-off-by: Ricardo Ribalda <ribalda@...omium.org>
> ---
> To: Chun-Kuang Hu <chunkuang.hu@...nel.org>
> To: Philipp Zabel <p.zabel@...gutronix.de>
> To: David Airlie <airlied@...il.com>
> To: Daniel Vetter <daniel@...ll.ch>
> To: Matthias Brugger <matthias.bgg@...il.com>
> Cc: dri-devel@...ts.freedesktop.org
> Cc: linux-mediatek@...ts.infradead.org
> Cc: linux-arm-kernel@...ts.infradead.org
> Cc: linux-kernel@...r.kernel.org
> ---
>  drivers/gpu/drm/mediatek/mtk_drm_drv.c | 7 +++++++
>  1 file changed, 7 insertions(+)
>
> diff --git a/drivers/gpu/drm/mediatek/mtk_drm_drv.c b/drivers/gpu/drm/mediatek/mtk_drm_drv.c
> index 91f58db5915f..51dbd85796e9 100644
> --- a/drivers/gpu/drm/mediatek/mtk_drm_drv.c
> +++ b/drivers/gpu/drm/mediatek/mtk_drm_drv.c
> @@ -829,6 +829,12 @@ static int mtk_drm_remove(struct platform_device *pdev)
>         return 0;
>  }
>
> +static void mtk_drm_shutdown(struct platform_device *pdev)
> +{
> +       component_master_del(&pdev->dev, &mtk_drm_ops);
> +       pm_runtime_disable(&pdev->dev);
> +}

Would it be better to implement like rockchip [1]?

[1] https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/drivers/gpu/drm/rockchip/rockchip_drm_drv.c?h=v6.2-rc5#n462

Regards,
Chun-Kuang.

> +
>  static int mtk_drm_sys_prepare(struct device *dev)
>  {
>         struct mtk_drm_private *private = dev_get_drvdata(dev);
> @@ -856,6 +862,7 @@ static const struct dev_pm_ops mtk_drm_pm_ops = {
>  static struct platform_driver mtk_drm_platform_driver = {
>         .probe  = mtk_drm_probe,
>         .remove = mtk_drm_remove,
> +       .shutdown = mtk_drm_shutdown,
>         .driver = {
>                 .name   = "mediatek-drm",
>                 .pm     = &mtk_drm_pm_ops,
>
> ---
> base-commit: 4312098baf37ee17a8350725e6e0d0e8590252d4
> change-id: 20221128-mtk-drm-ca6c5ac6b389
>
> Best regards,
> --
> Ricardo Ribalda <ribalda@...omium.org>