linux-kernel - Re: [PATCH v2 14/15] drm/mediatek: Add support for multiple mmsys in the one mediatek-drm driver

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Message-ID: <6bf9d4b3e060461ec491a3703d7ba952f9c5dceb.camel@mediatek.com>
Date: Tue, 25 Mar 2025 03:44:57 +0000
From: CK Hu (胡俊光) <ck.hu@...iatek.com>
To: "robh@...nel.org" <robh@...nel.org>, "krzk+dt@...nel.org"
	<krzk+dt@...nel.org>, Paul-pl Chen (陳柏霖)
	<Paul-pl.Chen@...iatek.com>, "conor+dt@...nel.org" <conor+dt@...nel.org>,
	AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>,
	"chunkuang.hu@...nel.org" <chunkuang.hu@...nel.org>
CC: Sunny Shen (沈姍姍) <Sunny.Shen@...iatek.com>,
	Sirius Wang (王皓昱) <Sirius.Wang@...iatek.com>,
	Nancy Lin (林欣螢) <Nancy.Lin@...iatek.com>,
	Xiandong Wang (王先冬)
	<Xiandong.Wang@...iatek.com>, "linux-kernel@...r.kernel.org"
	<linux-kernel@...r.kernel.org>, "dri-devel@...ts.freedesktop.org"
	<dri-devel@...ts.freedesktop.org>, Project_Global_Chrome_Upstream_Group
	<Project_Global_Chrome_Upstream_Group@...iatek.com>,
	"linux-mediatek@...ts.infradead.org" <linux-mediatek@...ts.infradead.org>,
	Jason-JH Lin (林睿祥) <Jason-JH.Lin@...iatek.com>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"fshao@...omium.org" <fshao@...omium.org>, "p.zabel@...gutronix.de"
	<p.zabel@...gutronix.de>, Singo Chang (張興國)
	<Singo.Chang@...iatek.com>, "linux-arm-kernel@...ts.infradead.org"
	<linux-arm-kernel@...ts.infradead.org>, "matthias.bgg@...il.com"
	<matthias.bgg@...il.com>, "treapking@...omium.org" <treapking@...omium.org>
Subject: Re: [PATCH v2 14/15] drm/mediatek: Add support for multiple mmsys in
 the one mediatek-drm driver

On Fri, 2025-03-21 at 17:33 +0800, paul-pl.chen wrote:
> From: Nancy Lin <nancy.lin@...iatek.com>
> 
> To support multiple mmsys instances in the one mediatek-drm instance,
> providing improved flexibility and scalability by the following changes:
> 
> 1. Add DDP_COMPONENT_DRM_OVLSYS_ADAPTOR* to probe the
>   ovlsys_adaptor drivers and support different mmsys composition.
> 2. Added new component types MTK_DISP_VIRTUAL to support the
>   routing to virtual display components.
> 3. Added and adjusted the existed structure or interface to extend
>   the support of multiple mmsys instances.
> 4. Modified the component matching and binding logic to support
>   multiple mmsys instances.
> 
> Signed-off-by: Nancy Lin <nancy.lin@...iatek.com>
> Signed-off-by: Paul-pl Chen <paul-pl.chen@...iatek.com>
> ---

[snip]

>  
> +enum mtk_drm_mmsys {
> +	DISPSYS0,
> +	DISPSYS1,
> +	OVLSYS0,
> +	OVLSYS1,
> +	MAX_MMSYS,
> +};

Let ovlsys sub driver control OVLSYS0 and OVLSYS1, so mediatek drm driver would not see them and this patch is not necessary.

Regards,
CK