linux-kernel - Re: [PATCH v3 13/14] drm/msm/dp: drop struct msm_dp_panel

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Message-ID: <3346b2fb-1366-476b-bb52-e42a2170d719@quicinc.com>
Date: Wed, 11 Dec 2024 19:26:47 -0800
From: Abhinav Kumar <quic_abhinavk@...cinc.com>
To: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
        Rob Clark
	<robdclark@...il.com>, Sean Paul <sean@...rly.run>,
        Marijn Suijten
	<marijn.suijten@...ainline.org>,
        David Airlie <airlied@...il.com>, "Simona
 Vetter" <simona@...ll.ch>,
        Paloma Arellano <quic_parellan@...cinc.com>
CC: Douglas Anderson <dianders@...omium.org>,
        Stephen Boyd
	<swboyd@...omium.org>, <linux-arm-msm@...r.kernel.org>,
        <dri-devel@...ts.freedesktop.org>, <freedreno@...ts.freedesktop.org>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3 13/14] drm/msm/dp: drop struct msm_dp_panel_in



On 12/11/2024 3:41 PM, Dmitry Baryshkov wrote:
> All other submodules pass arguments directly. Drop struct
> msm_dp_panel_in that is used to wrap dp_panel's submodule args and pass
> all data to msm_dp_panel_get() directly.
> 
> Reviewed-by: Stephen Boyd <swboyd@...omium.org>
> Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
> ---
>   drivers/gpu/drm/msm/dp/dp_display.c |  9 +--------
>   drivers/gpu/drm/msm/dp/dp_panel.c   | 15 ++++++++-------
>   drivers/gpu/drm/msm/dp/dp_panel.h   | 10 ++--------
>   3 files changed, 11 insertions(+), 23 deletions(-)
> 

Change not necessarily tied to catalog cleanup, and can be sent 
independently IMO.

> diff --git a/drivers/gpu/drm/msm/dp/dp_display.c b/drivers/gpu/drm/msm/dp/dp_display.c
> index cb02d5d5b404925707c737ed75e9e83fbec34f83..a2cdcdac042d63a59ff71aefcecb7f8b22f01167 100644
> --- a/drivers/gpu/drm/msm/dp/dp_display.c
> +++ b/drivers/gpu/drm/msm/dp/dp_display.c
> @@ -722,9 +722,6 @@ static int msm_dp_init_sub_modules(struct msm_dp_display_private *dp)
>   {
>   	int rc = 0;
>   	struct device *dev = &dp->msm_dp_display.pdev->dev;
> -	struct msm_dp_panel_in panel_in = {
> -		.dev = dev,
> -	};
>   	struct phy *phy;
>   
>   	phy = devm_phy_get(dev, "dp");
> @@ -765,11 +762,7 @@ static int msm_dp_init_sub_modules(struct msm_dp_display_private *dp)
>   		goto error_link;
>   	}
>   
> -	panel_in.aux = dp->aux;
> -	panel_in.catalog = dp->catalog;
> -	panel_in.link = dp->link;
> -
> -	dp->panel = msm_dp_panel_get(&panel_in);
> +	dp->panel = msm_dp_panel_get(dev, dp->aux, dp->link, dp->catalog);
>   	if (IS_ERR(dp->panel)) {
>   		rc = PTR_ERR(dp->panel);
>   		DRM_ERROR("failed to initialize panel, rc = %d\n", rc);
> diff --git a/drivers/gpu/drm/msm/dp/dp_panel.c b/drivers/gpu/drm/msm/dp/dp_panel.c
> index 25869e2ac93aba0bffeddae9f95917d81870d8cb..49bbcde8cf60ac1b297310a50191135d79b092fb 100644
> --- a/drivers/gpu/drm/msm/dp/dp_panel.c
> +++ b/drivers/gpu/drm/msm/dp/dp_panel.c
> @@ -659,25 +659,26 @@ static int msm_dp_panel_parse_dt(struct msm_dp_panel *msm_dp_panel)
>   	return 0;
>   }
>   
> -struct msm_dp_panel *msm_dp_panel_get(struct msm_dp_panel_in *in)
> +struct msm_dp_panel *msm_dp_panel_get(struct device *dev, struct drm_dp_aux *aux,
> +			      struct msm_dp_link *link, struct msm_dp_catalog *catalog)
>   {

so this API, takes a filled input panel, makes a msm_dp_panel out of it 
by filling out more information on top of what was already passed in and 
returns a msm_dp_panel.

So IOW, converts a msm_dp_panel_in to msm_dp_panel.

What is the gain by passing individual params rather than passing them 
as a struct instead? Isnt it better to have it within that struct to 
show the conversion and moreover we dont have to pass in 4 arguments 
instead of 1.


>   	struct msm_dp_panel_private *panel;
>   	struct msm_dp_panel *msm_dp_panel;
>   	int ret;
>   
> -	if (!in->dev || !in->catalog || !in->aux || !in->link) {
> +	if (!dev || !catalog || !aux || !link) {
>   		DRM_ERROR("invalid input\n");
>   		return ERR_PTR(-EINVAL);
>   	}
>   
> -	panel = devm_kzalloc(in->dev, sizeof(*panel), GFP_KERNEL);
> +	panel = devm_kzalloc(dev, sizeof(*panel), GFP_KERNEL);
>   	if (!panel)
>   		return ERR_PTR(-ENOMEM);
>   
> -	panel->dev = in->dev;
> -	panel->aux = in->aux;
> -	panel->catalog = in->catalog;
> -	panel->link = in->link;
> +	panel->dev = dev;
> +	panel->aux = aux;
> +	panel->catalog = catalog;
> +	panel->link = link;
>   
>   	msm_dp_panel = &panel->msm_dp_panel;
>   	msm_dp_panel->max_bw_code = DP_LINK_BW_8_1;
> diff --git a/drivers/gpu/drm/msm/dp/dp_panel.h b/drivers/gpu/drm/msm/dp/dp_panel.h
> index f305b1151118b53762368905b70d951a366ba1a8..a4719a3bbbddd18304227a006e82a5ce9ad7bbf3 100644
> --- a/drivers/gpu/drm/msm/dp/dp_panel.h
> +++ b/drivers/gpu/drm/msm/dp/dp_panel.h
> @@ -21,13 +21,6 @@ struct msm_dp_display_mode {
>   	bool out_fmt_is_yuv_420;
>   };
>   
> -struct msm_dp_panel_in {
> -	struct device *dev;
> -	struct drm_dp_aux *aux;
> -	struct msm_dp_link *link;
> -	struct msm_dp_catalog *catalog;
> -};
> -
>   struct msm_dp_panel_psr {
>   	u8 version;
>   	u8 capabilities;
> @@ -94,6 +87,7 @@ static inline bool is_lane_count_valid(u32 lane_count)
>   		lane_count == 4);
>   }
>   
> -struct msm_dp_panel *msm_dp_panel_get(struct msm_dp_panel_in *in);
> +struct msm_dp_panel *msm_dp_panel_get(struct device *dev, struct drm_dp_aux *aux,
> +			      struct msm_dp_link *link, struct msm_dp_catalog *catalog);
>   void msm_dp_panel_put(struct msm_dp_panel *msm_dp_panel);
>   #endif /* _DP_PANEL_H_ */
>