Date:   Tue, 16 Jul 2019 16:13:26 -0700
From:   Ryan Case <ryandcase@...omium.org>
To:     yongqiang.niu@...iatek.com
Cc:     CK Hu <ck.hu@...iatek.com>, Philipp Zabel <p.zabel@...gutronix.de>,
        Rob Herring <robh+dt@...nel.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Mark Rutland <mark.rutland@....com>,
        dri-devel@...ts.freedesktop.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org
Subject: Re: [PATCH v4, 23/33] drm/mediatek: add ovl0/ovl_2l0 usecase

On Mon, Jul 8, 2019 at 3:35 PM <yongqiang.niu@...iatek.com> wrote:
>
> From: Yongqiang Niu <yongqiang.niu@...iatek.com>
>
> This patch add ovl0/ovl_2l0 usecase
> in ovl->ovl_2l0 direct link usecase:
> 1. the crtc support layer number will 4+2
> 2. ovl_2l0 background color input select ovl0 when crtc init
> and disable it when crtc finish
> 3. config ovl_2l0 layer, if crtc config layer number is
> bigger than ovl0 support layers(max is 4)
>
> Signed-off-by: Yongqiang Niu <yongqiang.niu@...iatek.com>
> ---
>  drivers/gpu/drm/mediatek/mtk_drm_crtc.c | 38 +++++++++++++++++++++++++++++++--
>  1 file changed, 36 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/gpu/drm/mediatek/mtk_drm_crtc.c b/drivers/gpu/drm/mediatek/mtk_drm_crtc.c
> index 5eac376..9ee9ce2 100644
> --- a/drivers/gpu/drm/mediatek/mtk_drm_crtc.c
> +++ b/drivers/gpu/drm/mediatek/mtk_drm_crtc.c
> @@ -282,6 +282,15 @@ static int mtk_crtc_ddp_hw_init(struct mtk_drm_crtc *mtk_crtc)
>
>         for (i = 0; i < mtk_crtc->ddp_comp_nr; i++) {
>                 struct mtk_ddp_comp *comp = mtk_crtc->ddp_comp[i];
> +               enum mtk_ddp_comp_id prev;
> +
> +               if (i > 0)
> +                       prev = mtk_crtc->ddp_comp[i - 1]->id;
> +               else
> +                       prev = DDP_COMPONENT_ID_MAX;
> +
> +               if (prev == DDP_COMPONENT_OVL0)
> +                       mtk_ddp_comp_bgclr_in_on(comp);
>
>                 mtk_ddp_comp_config(comp, width, height, vrefresh, bpc);
>                 mtk_ddp_comp_start(comp);
> @@ -291,9 +300,18 @@ static int mtk_crtc_ddp_hw_init(struct mtk_drm_crtc *mtk_crtc)
>         for (i = 0; i < mtk_crtc->layer_nr; i++) {
>                 struct drm_plane *plane = &mtk_crtc->planes[i];
>                 struct mtk_plane_state *plane_state;
> +               struct mtk_ddp_comp *comp = mtk_crtc->ddp_comp[0];
> +               unsigned int comp_layer_nr = mtk_ddp_comp_layer_nr(comp);
> +               unsigned int local_layer;
>
>                 plane_state = to_mtk_plane_state(plane->state);
> -               mtk_ddp_comp_layer_config(mtk_crtc->ddp_comp[0], i,
> +
> +               if (i >= comp_layer_nr) {
> +                       comp = mtk_crtc->ddp_comp[1];
> +                       local_layer = i - comp_layer_nr;
> +               } else
> +                       local_layer = i;
> +               mtk_ddp_comp_layer_config(comp , local_layer,
>                                           plane_state);

There is an extra space after comp.

This whole loop is essentially identical to the one found in
mtk_crtc_ddp_config below. It would be nice to either move that loop
to a dedicated function called from both spots or allow
mtk_crtc_ddp_config to be called from here.

>         }
>
> @@ -319,6 +337,7 @@ static void mtk_crtc_ddp_hw_fini(struct mtk_drm_crtc *mtk_crtc)
>                                            mtk_crtc->ddp_comp[i]->id);
>         mtk_disp_mutex_disable(mtk_crtc->mutex);
>         for (i = 0; i < mtk_crtc->ddp_comp_nr - 1; i++) {
> +               mtk_ddp_comp_bgclr_in_off(mtk_crtc->ddp_comp[i]);
>                 mtk_ddp_remove_comp_from_path(mtk_crtc->config_regs,
>                                               mtk_crtc->mmsys_reg_data,
>                                               mtk_crtc->ddp_comp[i]->id,
> @@ -339,6 +358,8 @@ static void mtk_crtc_ddp_config(struct drm_crtc *crtc)
>         struct mtk_crtc_state *state = to_mtk_crtc_state(mtk_crtc->base.state);
>         struct mtk_ddp_comp *comp = mtk_crtc->ddp_comp[0];
>         unsigned int i;
> +       unsigned int comp_layer_nr = mtk_ddp_comp_layer_nr(comp);
> +       unsigned int local_layer;
>
>         /*
>          * TODO: instead of updating the registers here, we should prepare
> @@ -361,7 +382,14 @@ static void mtk_crtc_ddp_config(struct drm_crtc *crtc)
>                         plane_state = to_mtk_plane_state(plane->state);
>
>                         if (plane_state->pending.config) {
> -                               mtk_ddp_comp_layer_config(comp, i, plane_state);
> +                               if (i >= comp_layer_nr) {
> +                                       comp = mtk_crtc->ddp_comp[1];
> +                                       local_layer = i - comp_layer_nr;
> +                               } else
> +                                       local_layer = i;
> +
> +                               mtk_ddp_comp_layer_config(comp, local_layer,
> +                                                         plane_state);
>                                 plane_state->pending.config = false;
>                         }
>                 }
> @@ -592,6 +620,12 @@ int mtk_drm_crtc_create(struct drm_device *drm_dev,
>         }
>
>         mtk_crtc->layer_nr = mtk_ddp_comp_layer_nr(mtk_crtc->ddp_comp[0]);
> +       if (mtk_crtc->ddp_comp_nr > 1) {
> +               struct mtk_ddp_comp *comp = mtk_crtc->ddp_comp[1];
> +
> +               if (comp->funcs->bgclr_in_on)
> +                       mtk_crtc->layer_nr += mtk_ddp_comp_layer_nr(comp);
> +       }
>         mtk_crtc->planes = devm_kcalloc(dev, mtk_crtc->layer_nr,
>                                         sizeof(struct drm_plane),
>                                         GFP_KERNEL);
> --
> 1.8.1.1.dirty
>

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