Re: [PATCH 3/3] drm: mediatek: unbind components in mtk_drm_unbind()

[CK Hu <ck.hu@mediatek.com>]

Hi, Hsin-Yi:

On Mon, 2019-05-27 at 12:50 +0800, Hsin-Yi Wang wrote:
> Unbinding components (i.e. mtk_dsi and mtk_disp_ovl/rdma/color) will
> trigger master(mtk_drm)'s .unbind(), and currently mtk_drm's unbind
> won't actually unbind components. During the next bind,
> mtk_drm_kms_init() is called, and the components are added back.
> 
> .unbind() should call mtk_drm_kms_deinit() to unbind components.
> 
> And since component_master_del() in .remove() will trigger .unbind(),
> which will also unregister device, it's fine to remove original functions
> called here.
> 
> Fixes: 119f5173628a ("drm/mediatek: Add DRM Driver for Mediatek SoC MT8173.")
> Signed-off-by: Hsin-Yi Wang <hsinyi@chromium.org>
> ---
>  drivers/gpu/drm/mediatek/mtk_drm_drv.c | 8 +++-----
>  1 file changed, 3 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/gpu/drm/mediatek/mtk_drm_drv.c b/drivers/gpu/drm/mediatek/mtk_drm_drv.c
> index 57ce4708ef1b..bbfe3a464aea 100644
> --- a/drivers/gpu/drm/mediatek/mtk_drm_drv.c
> +++ b/drivers/gpu/drm/mediatek/mtk_drm_drv.c
> @@ -311,6 +311,7 @@ static int mtk_drm_kms_init(struct drm_device *drm)
>  static void mtk_drm_kms_deinit(struct drm_device *drm)
>  {
>  	drm_kms_helper_poll_fini(drm);
> +	drm_atomic_helper_shutdown(drm);

This looks not related to this patch. This patch is related to the
unbind timing. You could separate this to an independent patch.

>  
>  	component_unbind_all(drm->dev, drm);
>  	drm_mode_config_cleanup(drm);
> @@ -397,7 +398,9 @@ static void mtk_drm_unbind(struct device *dev)
>  	struct mtk_drm_private *private = dev_get_drvdata(dev);
>  
>  	drm_dev_unregister(private->drm);
> +	mtk_drm_kms_deinit(private->drm);
>  	drm_dev_put(private->drm);
> +	private->num_pipes = 0;

This looks not related to this patch. This patch is related to the
unbind timing. You could separate this to an independent patch.

Regards,
CK

>  	private->drm = NULL;
>  }
>  
> @@ -568,13 +571,8 @@ static int mtk_drm_probe(struct platform_device *pdev)
>  static int mtk_drm_remove(struct platform_device *pdev)
>  {
>  	struct mtk_drm_private *private = platform_get_drvdata(pdev);
> -	struct drm_device *drm = private->drm;
>  	int i;
>  
> -	drm_dev_unregister(drm);
> -	mtk_drm_kms_deinit(drm);
> -	drm_dev_put(drm);
> -
>  	component_master_del(&pdev->dev, &mtk_drm_ops);
>  	pm_runtime_disable(&pdev->dev);
>  	of_node_put(private->mutex_node);