linux-kernel - Re: [PATCH v2 6/8] drm/msm/dpu: Remove num_enc from topology struct in favour of num

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Date:   Mon, 9 Jan 2023 01:31:57 +0200
From:   Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To:     Marijn Suijten <marijn.suijten@...ainline.org>,
        phone-devel@...r.kernel.org, Rob Clark <robdclark@...il.com>,
        Abhinav Kumar <quic_abhinavk@...cinc.com>,
        Vinod Koul <vkoul@...nel.org>
Cc:     ~postmarketos/upstreaming@...ts.sr.ht,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...ainline.org>,
        Konrad Dybcio <konrad.dybcio@...ainline.org>,
        Martin Botka <martin.botka@...ainline.org>,
        Jami Kettunen <jami.kettunen@...ainline.org>,
        Sean Paul <sean@...rly.run>, David Airlie <airlied@...il.com>,
        Daniel Vetter <daniel@...ll.ch>,
        Stephen Boyd <swboyd@...omium.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Jessica Zhang <quic_jesszhan@...cinc.com>,
        Ville Syrjälä <ville.syrjala@...ux.intel.com>,
        Kuogee Hsieh <quic_khsieh@...cinc.com>,
        Jani Nikula <jani.nikula@...el.com>,
        sunliming <sunliming@...inos.cn>,
        Sam Ravnborg <sam@...nborg.org>,
        Haowen Bai <baihaowen@...zu.com>,
        Konrad Dybcio <konrad.dybcio@...aro.org>,
        Loic Poulain <loic.poulain@...aro.org>,
        Vinod Polimera <quic_vpolimer@...cinc.com>,
        Douglas Anderson <dianders@...omium.org>,
        Vladimir Lypak <vladimir.lypak@...il.com>,
        linux-arm-msm@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        freedreno@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 6/8] drm/msm/dpu: Remove num_enc from topology struct
 in favour of num_dsc

On 22/12/2022 01:19, Marijn Suijten wrote:
> Downstream calls this num_enc yet the DSC patches introduced a new
> num_dsc struct member, leaving num_enc effectively unused.
> 
> Fixes: 7e9cc175b159 ("drm/msm/disp/dpu1: Add support for DSC in topology")
> Signed-off-by: Marijn Suijten <marijn.suijten@...ainline.org>
> ---
>   drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c | 9 ++++-----
>   drivers/gpu/drm/msm/disp/dpu1/dpu_rm.c      | 4 ++--
>   drivers/gpu/drm/msm/msm_drv.h               | 2 --
>   3 files changed, 6 insertions(+), 9 deletions(-)
> 
> diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
> index 9c6817b5a194..a158cd502d38 100644
> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
> @@ -579,19 +579,18 @@ static struct msm_display_topology dpu_encoder_get_topology(
>   			topology.num_dspp = topology.num_lm;
>   	}
>   
> -	topology.num_enc = 0;
>   	topology.num_intf = intf_count;
>   
>   	if (dpu_enc->dsc) {
> -		/* In case of Display Stream Compression (DSC), we would use
> -		 * 2 encoders, 2 layer mixers and 1 interface
> +		/*
> +		 * In case of Display Stream Compression (DSC), we would use
> +		 * 2 DSC encoders, 2 layer mixers and 1 interface
>   		 * this is power optimal and can drive up to (including) 4k
>   		 * screens
>   		 */
> -		topology.num_enc = 2;
>   		topology.num_dsc = 2;
> -		topology.num_intf = 1;
>   		topology.num_lm = 2;
> +		topology.num_intf = 1;

Unless there is a reason, please move num_intf assignment back while 
preparing v3.

With that fixed:

Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>

>   	}
>   
>   	return topology;
> diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_rm.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_rm.c
> index dcbf03d2940a..5e7aa0f3a31c 100644
> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_rm.c
> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_rm.c
> @@ -548,8 +548,8 @@ static int _dpu_rm_populate_requirements(
>   {
>   	reqs->topology = req_topology;
>   
> -	DRM_DEBUG_KMS("num_lm: %d num_enc: %d num_intf: %d\n",
> -		      reqs->topology.num_lm, reqs->topology.num_enc,
> +	DRM_DEBUG_KMS("num_lm: %d num_dsc: %d num_intf: %d\n",
> +		      reqs->topology.num_lm, reqs->topology.num_dsc,
>   		      reqs->topology.num_intf);
>   
>   	return 0;
> diff --git a/drivers/gpu/drm/msm/msm_drv.h b/drivers/gpu/drm/msm/msm_drv.h
> index d4e0ef608950..74626a271f46 100644
> --- a/drivers/gpu/drm/msm/msm_drv.h
> +++ b/drivers/gpu/drm/msm/msm_drv.h
> @@ -82,14 +82,12 @@ enum msm_event_wait {
>   /**
>    * struct msm_display_topology - defines a display topology pipeline
>    * @num_lm:       number of layer mixers used
> - * @num_enc:      number of compression encoder blocks used
>    * @num_intf:     number of interfaces the panel is mounted on
>    * @num_dspp:     number of dspp blocks used
>    * @num_dsc:      number of Display Stream Compression (DSC) blocks used
>    */
>   struct msm_display_topology {
>   	u32 num_lm;
> -	u32 num_enc;
>   	u32 num_intf;
>   	u32 num_dspp;
>   	u32 num_dsc;

-- 
With best wishes
Dmitry