linux-kernel - Re: [Freedreno] [PATCH] drm/msm/dpu: fix/enable 6bpc dither with split-lm

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Date:   Mon, 20 Jul 2020 08:23:09 -0700
From:   Rob Clark <robdclark@...il.com>
To:     Kalyan Thota <kalyan_t@...eaurora.org>
Cc:     dri-devel <dri-devel@...ts.freedesktop.org>,
        Rob Clark <robdclark@...omium.org>,
        "open list:DRM DRIVER FOR MSM ADRENO GPU" 
        <freedreno@...ts.freedesktop.org>, Sam Ravnborg <sam@...nborg.org>,
        David Airlie <airlied@...ux.ie>,
        Steev Klimaszewski <steev@...too.org>,
        "open list:DRM DRIVER FOR MSM ADRENO GPU" 
        <linux-arm-msm@...r.kernel.org>,
        Doug Anderson <dianders@...omium.org>,
        Stephen Boyd <swboyd@...omium.org>,
        Zheng Bin <zhengbin13@...wei.com>,
        Daniel Vetter <daniel@...ll.ch>,
        Drew Davenport <ddavenport@...omium.org>,
        Sean Paul <sean@...rly.run>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [Freedreno] [PATCH] drm/msm/dpu: fix/enable 6bpc dither with split-lm

On Mon, Jul 20, 2020 at 5:53 AM <kalyan_t@...eaurora.org> wrote:
>
> On 2020-07-16 03:49, Rob Clark wrote:
> > From: Rob Clark <robdclark@...omium.org>
> >
> > If split-lm is used (for ex, on sdm845), we can have multiple ping-
> > pongs, but only a single phys encoder.  We need to configure dithering
> > on each of them.
> >
> > Signed-off-by: Rob Clark <robdclark@...omium.org>
> > ---
> >  drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c   | 22 ++++++++++---------
> >  .../gpu/drm/msm/disp/dpu1/dpu_hw_pingpong.c   |  3 +--
> >  2 files changed, 13 insertions(+), 12 deletions(-)
> >
> > diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
> > b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
> > index 46df0ff75b85..9b98b63c77fb 100644
> > --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
> > +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder.c
> > @@ -212,14 +212,14 @@ static u32 dither_matrix[DITHER_MATRIX_SZ] = {
> >       15, 7, 13, 5, 3, 11, 1, 9, 12, 4, 14, 6, 0, 8, 2, 10
> >  };
> >
> > -static void _dpu_encoder_setup_dither(struct dpu_encoder_phys *phys)
> > +static void _dpu_encoder_setup_dither(struct dpu_hw_pingpong *hw_pp,
> > unsigned bpc)
> >  {
> >       struct dpu_hw_dither_cfg dither_cfg = { 0 };
> >
> > -     if (!phys->hw_pp || !phys->hw_pp->ops.setup_dither)
> > +     if (!hw_pp->ops.setup_dither)
> >               return;
> >
> > -     switch (phys->connector->display_info.bpc) {
> > +     switch (bpc) {
> >       case 6:
> >               dither_cfg.c0_bitdepth = 6;
> >               dither_cfg.c1_bitdepth = 6;
> > @@ -228,14 +228,14 @@ static void _dpu_encoder_setup_dither(struct
> > dpu_encoder_phys *phys)
> >               dither_cfg.temporal_en = 0;
> >               break;
> >       default:
> > -             phys->hw_pp->ops.setup_dither(phys->hw_pp, NULL);
> > +             hw_pp->ops.setup_dither(hw_pp, NULL);
> >               return;
> >       }
> >
> >       memcpy(&dither_cfg.matrix, dither_matrix,
> >                       sizeof(u32) * DITHER_MATRIX_SZ);
> >
> > -     phys->hw_pp->ops.setup_dither(phys->hw_pp, &dither_cfg);
> > +     hw_pp->ops.setup_dither(hw_pp, &dither_cfg);
> >  }
> >
> >  void dpu_encoder_helper_report_irq_timeout(struct dpu_encoder_phys
> > *phys_enc,
> > @@ -1132,11 +1132,13 @@ static void
> > _dpu_encoder_virt_enable_helper(struct drm_encoder *drm_enc)
> >
> >       _dpu_encoder_update_vsync_source(dpu_enc, &dpu_enc->disp_info);
> >
> > -     if (dpu_enc->disp_info.intf_type == DRM_MODE_ENCODER_DSI) {
> > -             for (i = 0; i < dpu_enc->num_phys_encs; i++) {
> > -                     struct dpu_encoder_phys *phys = dpu_enc->phys_encs[i];
> > -
> > -                     _dpu_encoder_setup_dither(phys);
> > +     if (dpu_enc->disp_info.intf_type == DRM_MODE_ENCODER_DSI &&
> > +                     !WARN_ON(dpu_enc->num_phys_encs == 0)) {
> > +             unsigned bpc = dpu_enc->phys_encs[0]->connector->display_info.bpc;
> > +             for (i = 0; i < MAX_CHANNELS_PER_ENC; i++) {
> > +                     if (!dpu_enc->hw_pp[i])
> > +                             continue;
> > +                     _dpu_encoder_setup_dither(dpu_enc->hw_pp[i], bpc);
> >               }
> >       }
> >  }
> > diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_pingpong.c
> > b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_pingpong.c
> > index 7411ab6bf6af..bea4ab5c58c5 100644
> > --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_pingpong.c
> > +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_pingpong.c
> > @@ -231,8 +231,7 @@ static void _setup_pingpong_ops(struct
> > dpu_hw_pingpong *c,
> >       c->ops.poll_timeout_wr_ptr = dpu_hw_pp_poll_timeout_wr_ptr;
> >       c->ops.get_line_count = dpu_hw_pp_get_line_count;
> >
> > -     if (test_bit(DPU_PINGPONG_DITHER, &features) &&
> > -             IS_SC7180_TARGET(c->hw.hwversion))
> > +     if (test_bit(DPU_PINGPONG_DITHER, &features))
> >               c->ops.setup_dither = dpu_hw_pp_setup_dither;
> >  };
>
> Change looks good to me

Does that count as a Reviewed-by?

BR,
-R

>
> - Kalyan