linux-kernel - Re: [PATCH v7 3/4] drm/mediatek: Add ability to support dynamic connector selection

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Message-ID: <7ba4f465-6910-8b23-e950-98598547e8d9@collabora.com>
Date:   Fri, 28 Jul 2023 10:11:07 +0200
From:   AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>
To:     "Jason-JH.Lin" <jason-jh.lin@...iatek.com>,
        Chun-Kuang Hu <chunkuang.hu@...nel.org>
Cc:     Matthias Brugger <matthias.bgg@...il.com>,
        Jason-ch Chen <jason-ch.chen@...iatek.com>,
        Johnson Wang <johnson.wang@...iatek.com>,
        Singo Chang <singo.chang@...iatek.com>,
        Nancy Lin <nancy.lin@...iatek.com>,
        Shawn Sung <shawn.sung@...iatek.com>,
        dri-devel@...ts.freedesktop.org,
        linux-mediatek@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Project_Global_Chrome_Upstream_Group@...iatek.com,
        Nathan Lu <nathan.lu@...iatek.com>
Subject: Re: [PATCH v7 3/4] drm/mediatek: Add ability to support dynamic
 connector selection

Il 27/07/23 18:41, Jason-JH.Lin ha scritto:
> 1. Move output drm connector from each ddp_path array to connector array.
> 2. Add dynamic select available connector flow in crtc create and enable.
> 
> Signed-off-by: Nancy Lin <nancy.lin@...iatek.com>
> Signed-off-by: Nathan Lu <nathan.lu@...iatek.com>
> Signed-off-by: Jason-JH.Lin <jason-jh.lin@...iatek.com>
> ---
>   drivers/gpu/drm/mediatek/mtk_disp_drv.h     |  1 +
>   drivers/gpu/drm/mediatek/mtk_dpi.c          |  9 +++
>   drivers/gpu/drm/mediatek/mtk_drm_crtc.c     | 75 ++++++++++++++++++++-
>   drivers/gpu/drm/mediatek/mtk_drm_crtc.h     |  5 +-
>   drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c | 26 +++++++
>   drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.h |  8 +++
>   drivers/gpu/drm/mediatek/mtk_drm_drv.c      | 20 ++++--
>   drivers/gpu/drm/mediatek/mtk_drm_drv.h      |  7 ++
>   8 files changed, 145 insertions(+), 6 deletions(-)
> 

..snip..

> diff --git a/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c b/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c
> index f114da4d36a9..bc7b0a0c20db 100644
> --- a/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c
> +++ b/drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c
> @@ -304,6 +304,7 @@ static const struct mtk_ddp_comp_funcs ddp_dither = {
>   static const struct mtk_ddp_comp_funcs ddp_dpi = {
>   	.start = mtk_dpi_start,
>   	.stop = mtk_dpi_stop,
> +	.encoder_index = mtk_dpi_encoder_index,
>   };
>   
>   static const struct mtk_ddp_comp_funcs ddp_dsc = {
> @@ -507,6 +508,25 @@ static bool mtk_drm_find_comp_in_ddp(struct device *dev,
>   	return false;
>   }
>   
> +static int mtk_drm_find_comp_in_ddp_conn_path(struct device *dev,
> +					      const struct mtk_drm_route *routes,
> +					      unsigned int routes_num,

`num_routes` would be more readable.

> +					      struct mtk_ddp_comp *ddp_comp)
> +{
> +	unsigned int i;
> +
> +	if (!routes)
> +		return 0;

if (!routes)
	return -EINVAL;

> +
> +	for (i = 0; i < routes_num; i++)
> +		if (dev == ddp_comp[routes[i].route_ddp].dev)
> +			return BIT(routes[i].crtc_id);
> +
> +	DRM_INFO("Failed to find comp in ddp connector table\n");

This print is redundant.

> +
> +	return 0;

return -ENODEV;

> +}
> +
>   int mtk_ddp_comp_get_id(struct device_node *node,
>   			enum mtk_ddp_comp_type comp_type)
>   {
> @@ -538,6 +558,12 @@ unsigned int mtk_drm_find_possible_crtc_by_comp(struct drm_device *drm,
>   					  private->data->third_len, private->ddp_comp))
>   		ret = BIT(2);
>   	else
> +		ret = mtk_drm_find_comp_in_ddp_conn_path(dev,
> +							 private->data->conn_routes,
> +							 private->data->num_conn_routes,
> +							 private->ddp_comp);
> +
> +	if (ret == 0)

if (ret < 0)

>   		DRM_INFO("Failed to find comp in ddp table\n");
>   
>   	return ret;

Regards,
Angelo