linux-kernel - Re: [PATCH] drm/mediatek: component type MTK_DISP_OVL

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Date:   Thu, 20 Feb 2020 09:36:08 +0800
From:   CK Hu <ck.hu@...iatek.com>
To:     Phong LE <ple@...libre.com>
CC:     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-arm-kernel@...ts.infradead.org>,
        <linux-mediatek@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] drm/mediatek: component type MTK_DISP_OVL_2L is not
 correctly handled

Hi, Phong:

On Wed, 2020-02-19 at 15:13 +0100, Phong LE wrote:
> The larb device remains NULL if the type is MTK_DISP_OVL_2L.
> A kernel panic is raised when a crtc uses mtk_smi_larb_get or
> mtk_smi_larb_put.
> 

Reviewed-by: CK Hu <ck.hu@...iatek.com>

> Signed-off-by: Phong LE <ple@...libre.com>
> ---
>  drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c b/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c
> index 1f5a112bb034..57c88de9a329 100644
> --- a/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c
> +++ b/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c
> @@ -471,6 +471,7 @@ int mtk_ddp_comp_init(struct device *dev, struct device_node *node,
>  	/* Only DMA capable components need the LARB property */
>  	comp->larb_dev = NULL;
>  	if (type != MTK_DISP_OVL &&
> +	    type != MTK_DISP_OVL_2L &&
>  	    type != MTK_DISP_RDMA &&
>  	    type != MTK_DISP_WDMA)
>  		return 0;