linux-kernel - Re: [PATCH 1/3] drm: mediatek: fix unbind functions

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Date:   Wed, 29 May 2019 09:35:11 +0800
From:   CK Hu <ck.hu@...iatek.com>
To:     Hsin-Yi Wang <hsinyi@...omium.org>
CC:     <linux-arm-kernel@...ts.infradead.org>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Matthias Brugger <matthias.bgg@...il.com>,
        <dri-devel@...ts.freedesktop.org>,
        <linux-mediatek@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/3] drm: mediatek: fix unbind functions

Hi, Hsin-yi:

On Mon, 2019-05-27 at 12:50 +0800, Hsin-Yi Wang wrote:
> move mipi_dsi_host_unregister() to .remove since mipi_dsi_host_register()
> is called in .probe.

In the latest kernel [1], mipi_dsi_host_register() is called in
mtk_dsi_bind(), I think we don't need this part.

[1]
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/drivers/gpu/drm/mediatek/mtk_dsi.c?h=v5.2-rc2

> 
> detatch panel in mtk_dsi_destroy_conn_enc(), since .bind will try to
> attach it again.
> 
> Fixes: 2e54c14e310f ("drm/mediatek: Add DSI sub driver")
> Signed-off-by: Hsin-Yi Wang <hsinyi@...omium.org>
> ---
>  drivers/gpu/drm/mediatek/mtk_dsi.c | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/mediatek/mtk_dsi.c b/drivers/gpu/drm/mediatek/mtk_dsi.c
> index b00eb2d2e086..c9b6d3a68c8b 100644
> --- a/drivers/gpu/drm/mediatek/mtk_dsi.c
> +++ b/drivers/gpu/drm/mediatek/mtk_dsi.c
> @@ -844,6 +844,8 @@ static void mtk_dsi_destroy_conn_enc(struct mtk_dsi *dsi)
>  	/* Skip connector cleanup if creation was delegated to the bridge */
>  	if (dsi->conn.dev)
>  		drm_connector_cleanup(&dsi->conn);
> +	if (dsi->panel)
> +		drm_panel_detach(dsi->panel);

I think mtk_dsi_destroy_conn_enc() has much thing to do and I would like
you to do more. You could refer to [2] for complete implementation.

[2]
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/drivers/gpu/drm/exynos/exynos_drm_dsi.c?h=v5.2-rc2#n1575

Regards,
CK

>  }
>  
>  static void mtk_dsi_ddp_start(struct mtk_ddp_comp *comp)
> @@ -1073,7 +1075,6 @@ static void mtk_dsi_unbind(struct device *dev, struct device *master,
>  	struct mtk_dsi *dsi = dev_get_drvdata(dev);
>  
>  	mtk_dsi_destroy_conn_enc(dsi);
> -	mipi_dsi_host_unregister(&dsi->host);
>  	mtk_ddp_comp_unregister(drm, &dsi->ddp_comp);
>  }
>  
> @@ -1179,6 +1180,7 @@ static int mtk_dsi_remove(struct platform_device *pdev)
>  
>  	mtk_output_dsi_disable(dsi);
>  	component_del(&pdev->dev, &mtk_dsi_component_ops);
> +	mipi_dsi_host_unregister(&dsi->host);
>  
>  	return 0;
>  }