linux-kernel - Re: [PATCH v1 3/5] drm/msm/dpu: save dpu topology configuration

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Message-ID: <897af051-aed4-938a-5ab1-c44c967ab02d@linaro.org>
Date:   Fri, 21 Apr 2023 03:12:08 +0300
From:   Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To:     Kuogee Hsieh <quic_khsieh@...cinc.com>,
        dri-devel@...ts.freedesktop.org, robdclark@...il.com,
        sean@...rly.run, swboyd@...omium.org, dianders@...omium.org,
        vkoul@...nel.org, daniel@...ll.ch, airlied@...il.com,
        agross@...nel.org, andersson@...nel.org
Cc:     quic_abhinavk@...cinc.com, quic_sbillaka@...cinc.com,
        marijn.suijten@...ainline.org, freedreno@...ts.freedesktop.org,
        linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1 3/5] drm/msm/dpu: save dpu topology configuration

On 21/04/2023 02:25, Kuogee Hsieh wrote:
> At current implementation, topology configuration is thrown away after
> dpu_rm_reserve(). This patch save the topology so that it can be used
> for DSC related calculation later.

Please take a look at 
https://patchwork.freedesktop.org/patch/527960/?series=115283&rev=2 .

> 
> Signed-off-by: Kuogee Hsieh <quic_khsieh@...cinc.com>
> ---
>   drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c | 32 ++++++++++++++---------------
>   1 file changed, 16 insertions(+), 16 deletions(-)
> 
> diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
> index ecb87bc..2fdacf1 100644
> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
> @@ -542,13 +542,13 @@ bool dpu_encoder_use_dsc_merge(struct drm_encoder *drm_enc)
>   	return (num_dsc > 0) && (num_dsc > intf_count);
>   }
>   
> -static struct msm_display_topology dpu_encoder_get_topology(
> +static void dpu_encoder_get_topology(
>   			struct dpu_encoder_virt *dpu_enc,
>   			struct dpu_kms *dpu_kms,
>   			struct drm_display_mode *mode,
> -			struct drm_crtc_state *crtc_state)
> +			struct drm_crtc_state *crtc_state,
> +			struct msm_display_topology *topology)
>   {
> -	struct msm_display_topology topology = {0};
>   	int i, intf_count = 0;
>   
>   	for (i = 0; i < MAX_PHYS_ENCODERS_PER_VIRTUAL; i++)
> @@ -567,16 +567,16 @@ static struct msm_display_topology dpu_encoder_get_topology(
>   	 * Add dspps to the reservation requirements if ctm is requested
>   	 */
>   	if (intf_count == 2)
> -		topology.num_lm = 2;
> +		topology->num_lm = 2;
>   	else if (!dpu_kms->catalog->caps->has_3d_merge)
> -		topology.num_lm = 1;
> +		topology->num_lm = 1;
>   	else
> -		topology.num_lm = (mode->hdisplay > MAX_HDISPLAY_SPLIT) ? 2 : 1;
> +		topology->num_lm = (mode->hdisplay > MAX_HDISPLAY_SPLIT) ? 2 : 1;
>   
>   	if (crtc_state->ctm)
> -		topology.num_dspp = topology.num_lm;
> +		topology->num_dspp = topology->num_lm;
>   
> -	topology.num_intf = intf_count;
> +	topology->num_intf = intf_count;
>   
>   	if (dpu_enc->dsc) {
>   		/*
> @@ -585,12 +585,10 @@ static struct msm_display_topology dpu_encoder_get_topology(
>   		 * this is power optimal and can drive up to (including) 4k
>   		 * screens
>   		 */
> -		topology.num_dsc = 2;
> -		topology.num_lm = 2;
> -		topology.num_intf = 1;
> +		topology->num_dsc = 2;
> +		topology->num_lm = 2;
> +		topology->num_intf = 1;
>   	}
> -
> -	return topology;
>   }
>   
>   static int dpu_encoder_virt_atomic_check(
> @@ -602,7 +600,7 @@ static int dpu_encoder_virt_atomic_check(
>   	struct msm_drm_private *priv;
>   	struct dpu_kms *dpu_kms;
>   	struct drm_display_mode *adj_mode;
> -	struct msm_display_topology topology;
> +	struct msm_display_topology *topology;
>   	struct dpu_global_state *global_state;
>   	int i = 0;
>   	int ret = 0;
> @@ -639,7 +637,9 @@ static int dpu_encoder_virt_atomic_check(
>   		}
>   	}
>   
> -	topology = dpu_encoder_get_topology(dpu_enc, dpu_kms, adj_mode, crtc_state);
> +	topology = &dpu_enc->topology;
> +	memset(topology, 0, sizeof (*topology));
> +	dpu_encoder_get_topology(dpu_enc, dpu_kms, adj_mode, crtc_state, topology);
>   
>   	/*
>   	 * Release and Allocate resources on every modeset
> @@ -650,7 +650,7 @@ static int dpu_encoder_virt_atomic_check(
>   
>   		if (!crtc_state->active_changed || crtc_state->enable)
>   			ret = dpu_rm_reserve(&dpu_kms->rm, global_state,
> -					drm_enc, crtc_state, topology);
> +					drm_enc, crtc_state, *topology);
>   	}
>   
>   	trace_dpu_enc_atomic_check_flags(DRMID(drm_enc), adj_mode->flags);

-- 
With best wishes
Dmitry