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 11:08:09 +0200
From:   Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To:     Marijn Suijten <marijn.suijten@...ainline.org>
Cc:     phone-devel@...r.kernel.org, Rob Clark <robdclark@...il.com>,
        Abhinav Kumar <quic_abhinavk@...cinc.com>,
        Vinod Koul <vkoul@...nel.org>,
        ~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 Mon, 9 Jan 2023 at 10:21, Marijn Suijten
<marijn.suijten@...ainline.org> wrote:
>
> On 2023-01-09 01:31:57, Dmitry Baryshkov wrote:
> > 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.
>
> The assignment was reordered to match the order described in the comment
> right above, such that this reads more naturally.  Not sure if it's
> worth sending that as a separate fix, or drop it entirely.

I see. Sounds logical then. Let's keep it as is.

>
> > With that fixed:
> >
> > Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
>
> <snip>



-- 
With best wishes
Dmitry