linux-kernel - Re: [PATCH 1/2] drm/mediatek: Add ability to support dynamic connector selection

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Message-ID: <f95ee9f4-71a3-2f92-ed9b-037e11b8e893@baylibre.com>
Date:   Wed, 12 Apr 2023 11:37:26 +0200
From:   Alexandre Mergnat <amergnat@...libre.com>
To:     "Jason-JH.Lin" <jason-jh.lin@...iatek.com>,
        Chun-Kuang Hu <chunkuang.hu@...nel.org>,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>
Cc:     Matthias Brugger <matthias.bgg@...il.com>,
        Rex-BC Chen <rex-bc.chen@...iatek.com>,
        Jonson Wang <jonson.wang@...iatek.com>,
        Singo Chang <singo.chang@...iatek.com>,
        Nancy Lin <nancy.lin@...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 1/2] drm/mediatek: Add ability to support dynamic
 connector selection

Hi Jason,

Can you give me the based git tree/branch for this series please ?
I want to do a non-regression test for mt8365-evk board.

Feedback below:

On 05/04/2023 16:51, Jason-JH.Lin wrote:
> 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.
> snip...
> diff --git a/drivers/gpu/drm/mediatek/mtk_drm_crtc.c b/drivers/gpu/drm/mediatek/mtk_drm_crtc.c
> index d40142842f85..5ff20d0de29b 100644
> --- a/drivers/gpu/drm/mediatek/mtk_drm_crtc.c
> +++ b/drivers/gpu/drm/mediatek/mtk_drm_crtc.c
> @@ -60,8 +60,13 @@ struct mtk_drm_crtc {
>   	struct device			*mmsys_dev;
>   	struct device			*dma_dev;
>   	struct mtk_mutex		*mutex;
> +

Remove this extra line please.

> +	unsigned int			ddp_comp_nr_ori;
> +	unsigned int			max_ddp_comp_nr;
>   	unsigned int			ddp_comp_nr;
>   	struct mtk_ddp_comp		**ddp_comp;
> +	unsigned int			conn_route_nr;
> +	const struct mtk_drm_route	*conn_routes;
>   
>   	/* lock for display hardware access */
>   	struct mutex			hw_lock;
> @@ -649,6 +654,85 @@ static void mtk_drm_crtc_disable_vblank(struct drm_crtc *crtc)
>   	mtk_ddp_comp_disable_vblank(comp);
>   }
>   
> +static unsigned int mtk_drm_crtc_max_num_route_comp(struct mtk_drm_crtc *mtk_crtc)
> +{
> +	unsigned int max_num = 0;
> +	unsigned int i;
> +
> +	if (!mtk_crtc->conn_route_nr)
> +		return 0;
> +
> +	for (i = 0; i < mtk_crtc->conn_route_nr; i++)
> +		max_num = (max_num > mtk_crtc->conn_routes[i].route_len) ? max_num :
> +				mtk_crtc->conn_routes[i].route_len;

if test is true, then do "max_num = max_num"
I'm not sure the compiler will optimize that.
Also, I think it more readable like that:

if (max_num < mtk_crtc->conn_routes[i].route_len) {
	max_num = mtk_crtc->conn_routes[i].route_len;
}

> +
> +	return max_num;
> +}
> +
> +static int mtk_drm_crtc_update_output(struct drm_crtc *crtc,
> +				      struct drm_atomic_state *state)
> +{
> +	int crtc_index = drm_crtc_index(crtc);
> +	struct drm_crtc_state *crtc_state = state->crtcs[crtc_index].new_state;
> +	unsigned int encoder_mask = crtc_state->encoder_mask;
> +	struct mtk_drm_private *priv = crtc->dev->dev_private;
> +	struct device *dev;
> +	struct mtk_drm_crtc *mtk_crtc = to_mtk_crtc(crtc);
> +	const struct mtk_drm_route *conn_routes;
> +	unsigned int route_len = 0, route_index = 0;
> +	unsigned int comp_id;
> +	int i;

Can you put them in alphabetical order please ?

> +
> +	if (!mtk_crtc->conn_route_nr)
> +		return 0;
> +
> snip...
> diff --git a/drivers/gpu/drm/mediatek/mtk_drm_crtc.h b/drivers/gpu/drm/mediatek/mtk_drm_crtc.h
> index 3e9046993d09..96790f8f7a94 100644
> --- a/drivers/gpu/drm/mediatek/mtk_drm_crtc.h
> +++ b/drivers/gpu/drm/mediatek/mtk_drm_crtc.h
> @@ -7,6 +7,7 @@
>   #define MTK_DRM_CRTC_H
>   
>   #include <drm/drm_crtc.h>
> +#include "mtk_drm_drv.h"

Alphabetical order please.

>   #include "mtk_drm_ddp_comp.h"
>   #include "mtk_drm_plane.h"
>   
> @@ -18,7 +19,9 @@ void mtk_drm_crtc_commit(struct drm_crtc *crtc);
>   int mtk_drm_crtc_create(struct drm_device *drm_dev,
>   			const unsigned int *path,
>   			unsigned int path_len,
> -			int priv_data_index);
> +			int priv_data_index,
> +			const struct mtk_drm_route *conn_routes,
> +			unsigned int conn_routes_num);
>   int mtk_drm_crtc_plane_check(struct drm_crtc *crtc, struct drm_plane *plane,
>   			     struct mtk_plane_state *state);
>   void mtk_drm_crtc_async_update(struct drm_crtc *crtc, struct drm_plane *plane,


Regards,
Alexandre