linux-kernel - Re: Re: Re: [PATCH v2 1/5] drm/mediatek: config component output by device node port

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Message-ID: <D0A969BC-1BB3-4EBB-8D03-DAA610E62EBE@public-files.de>
Date:   Mon, 03 Aug 2020 20:02:38 +0200
From:   Frank Wunderlich <frank-w@...lic-files.de>
To:     linux-mediatek@...ts.infradead.org,
        Chun-Kuang Hu <chunkuang.hu@...nel.org>, ryder.lee@...iatek.com
CC:     Daniel Vetter <daniel@...ll.ch>, David Airlie <airlied@...ux.ie>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        DRI Development <dri-devel@...ts.freedesktop.org>,
        "moderated list:ARM/Mediatek SoC support" 
        <linux-mediatek@...ts.infradead.org>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Bibby Hsieh <bibby.hsieh@...iatek.com>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>
Subject: Re: Re: Re: [PATCH v2 1/5] drm/mediatek: config component output by device node port



Am 3. August 2020 18:27:02 MESZ schrieb Chun-Kuang Hu <chunkuang.hu@...nel.org>:

>But now I have a solution that you need not to modify binding document.
>Because now mt7623 has a different routing than mt2701, and this
>patch's approach is to use different port setting in each device tree.
>My solution is that these two SoC has different compatible string:
>"mediatek,mt7623-mmsys" and "mediatek,mt2701-mmsys". For now,
>"mediatek,mt2701-mmsys" has its data as
>
>static const struct mtk_mmsys_driver_data mt2701_mmsys_driver_data = {
>.main_path = mt2701_mtk_ddp_main,
>.main_len = ARRAY_SIZE(mt2701_mtk_ddp_main),
>.ext_path = mt2701_mtk_ddp_ext,
>.ext_len = ARRAY_SIZE(mt2701_mtk_ddp_ext),
>.shadow_register = true,
>};
>
>I think you could create a data for "mediatek,mt7623-mmsys" which has
>a different routing.

The paths are defined as this:

static enum mtk_ddp_comp_id mt2701_mtk_ddp_main[] = {	DDP_COMPONENT_OVL0,	DDP_COMPONENT_RDMA0,	DDP_COMPONENT_COLOR0,	DDP_COMPONENT_BLS,	DDP_COMPONENT_DSI0,};

static enum mtk_ddp_comp_id mt2701_mtk_ddp_ext[] = {	DDP_COMPONENT_RDMA1,	DDP_COMPONENT_DPI0,};

First thing i notice is that main=dsi and ext=dpi (hdmi). I guess dpi should be main,right? And bls is actually routed to dpi...how about the other components?

The 2 loops are not really clear to me (except 1st overwrites mt2701 main-path and second ext_path based on ports/endpoints) but this only applies from bls-dpi-hdmi-connector,not xdma/color or similar.
Or should be main-path (or external) only bls and dpi? It looks like it only swappes dpi and dsi in my case.

@Ryder Lee can you explain it?
regards Frank