linux-kernel - Re: [PATCH v2 3/3] drm/mediatek: Implement OF graphs support for display paths

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Message-Id: <D12G1NPU2H06.3LBLR19XYUAA6@kernel.org>
Date: Mon, 06 May 2024 11:11:36 +0200
From: "Michael Walle" <mwalle@...nel.org>
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>
Subject: Re: [PATCH v2 3/3] drm/mediatek: Implement OF graphs support for
 display paths

Hi Angelo,

On Tue Apr 9, 2024 at 2:02 PM CEST, AngeloGioacchino Del Regno wrote:
> +static int mtk_drm_of_get_ddp_ep_cid(struct device_node *node,
> +				     int output_port, enum mtk_drm_crtc_path crtc_path,

Not sure what's your base branch is, but "enum mtk_drm_crtc_path"
was renamed to "enum mtk_crtc_path" in commit 9e149879038f5
('drm/mediatek: Rename "mtk_drm_crtc" to "mtk_crtc"').

> +/**
> + * mtk_drm_of_ddp_path_build_one - Build a Display HW Pipeline for a CRTC Path
> + * @dev:          The mediatek-drm device
> + * @cpath:        CRTC Path relative to a VDO or MMSYS
> + * @out_path:     Pointer to an array that will contain the new pipeline
> + * @out_path_len: Number of entries in the pipeline array
> + *
> + * MediaTek SoCs can use different DDP hardware pipelines (or paths) depending
> + * on the board-specific desired display configuration; this function walks
> + * through all of the output endpoints starting from a VDO or MMSYS hardware
> + * instance and builds the right pipeline as specified in device trees.
> + *
> + * Return:
> + * * %0       - Display HW Pipeline successfully built and validated
> + * * %-ENOENT - Display pipeline was not specified in device tree
> + * * %-EINVAL - Display pipeline built but validation failed
> + * * %-ENOMEM - Failure to allocate pipeline array to pass to the caller
> + */
> +static int mtk_drm_of_ddp_path_build_one(struct device *dev, enum mtk_drm_crtc_path cpath,

likewise

> +					 const unsigned int **out_path,
> +					 unsigned int *out_path_len)

-michael