linux-kernel - Re: [PATCH v8 0/3] drm/mediatek: Add support for OF graphs

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Message-Id: <D233EO49QOHJ.Z924UBW5OPJU@walle.cc>
Date: Tue, 18 Jun 2024 13:05:59 +0200
From: "Michael Walle" <michael@...le.cc>
To: "AngeloGioacchino Del Regno" <angelogioacchino.delregno@...labora.com>,
 <chunkuang.hu@...nel.org>
Cc: <robh@...nel.org>, <krzysztof.kozlowski+dt@...aro.org>,
 <conor+dt@...nel.org>, <p.zabel@...gutronix.de>, <airlied@...il.com>,
 <daniel@...ll.ch>, <maarten.lankhorst@...ux.intel.com>,
 <mripard@...nel.org>, <tzimmermann@...e.de>, <matthias.bgg@...il.com>,
 <shawn.sung@...iatek.com>, <yu-chang.lee@...iatek.com>,
 <ck.hu@...iatek.com>, <jitao.shi@...iatek.com>,
 <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
 <dri-devel@...ts.freedesktop.org>, <linux-mediatek@...ts.infradead.org>,
 <linux-arm-kernel@...ts.infradead.org>, <wenst@...omium.org>,
 <kernel@...labora.com>, <sui.jingfeng@...ux.dev>
Subject: Re: [PATCH v8 0/3] drm/mediatek: Add support for OF graphs

On Tue Jun 18, 2024 at 12:17 PM CEST, AngeloGioacchino Del Regno wrote:
> The display IPs in MediaTek SoCs are *VERY* flexible and those support
> being interconnected with different instances of DDP IPs (for example,
> merge0 or merge1) and/or with different DDP IPs (for example, rdma can
> be connected with either color, dpi, dsi, merge, etc), forming a full
> Display Data Path that ends with an actual display.
>
> This series was born because of an issue that I've found while enabling
> support for MT8195/MT8395 boards with DSI output as main display: the
> current mtk_drm_route variations would not work as currently, the driver
> hardcodes a display path for Chromebooks, which have a DisplayPort panel
> with DSC support, instead of a DSI panel without DSC support.
>
> There are other reasons for which I wrote this series, and I find that
> hardcoding those paths - when a HW path is clearly board-specific - is
> highly suboptimal. Also, let's not forget about keeping this driver from
> becoming a huge list of paths for each combination of SoC->board->disp
> and... this and that.
>
> For more information, please look at the commit description for each of
> the commits included in this series.
>
> This series is essential to enable support for the MT8195/MT8395 EVK,
> Kontron i1200, Radxa NIO-12L and, mainly, for non-Chromebook boards
> and Chromebooks to co-exist without conflicts.
>
> Besides, this is also a valid option for MT8188 Chromebooks which might
> have different DSI-or-eDP displays depending on the model (as far as I
> can see from the mtk_drm_route attempt for this SoC that is already
> present in this driver).
>
> This series was tested on MT8195 Cherry Tomato and on MT8395 Radxa
> NIO-12L with both hardcoded paths, OF graph support and partially
> hardcoded paths, and pure OF graph support including pipelines that
> require OVL_ADAPTOR support.
>
> AngeloGioacchino Del Regno (3):
>   dt-bindings: display: mediatek: Add OF graph support for board path
>   dt-bindings: arm: mediatek: mmsys: Add OF graph support for board path
>   drm/mediatek: Implement OF graphs support for display paths

Thanks!

Tested-by: Michael Walle <mwalle@...nel.org> # on kontron-sbc-i1200

-michael

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