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In-Reply-To: <1545638931-24938-18-git-send-email-yongqiang.niu@mediatek.com>
From:   Nicolas Boichat <drinkcat@chromium.org>
Date:   Tue, 25 Dec 2018 12:22:41 +0800
Message-ID: <CANMq1KBtkd8yMHppMDV1OYocB70L-UxrF0cnYiWMjQLA9NWbvQ@mail.gmail.com>
Subject: Re: [PATCH 17/18] drm/mediatek: add ovl0/ovl0_2l usecase
To:     Yongqiang Niu <yongqiang.niu@mediatek.com>
Cc:     CK Hu <ck.hu@mediatek.com>, Philipp Zabel <p.zabel@pengutronix.de>,
        David Airlie <airlied@linux.ie>,
        Rob Herring <robh+dt@kernel.org>,
        Mark Rutland <mark.rutland@arm.com>,
        Matthias Brugger <matthias.bgg@gmail.com>,
        devicetree@vger.kernel.org, lkml <linux-kernel@vger.kernel.org>,
        dri-devel@lists.freedesktop.org,
        linux-mediatek@lists.infradead.org,
        linux-arm Mailing List <linux-arm-kernel@lists.infradead.org>
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On Mon, Dec 24, 2018 at 6:52 PM Yongqiang Niu
<yongqiang.niu@mediatek.com> wrote:
>
> This patch add ovl0/ovl0_2l usecase
>
> Signed-off-by: Yongqiang Niu <yongqiang.niu@mediatek.com>
> ---
>  drivers/gpu/drm/mediatek/mtk_drm_crtc.c | 38 ++++++++++++++++++++++++++++++---
>  1 file changed, 35 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/gpu/drm/mediatek/mtk_drm_crtc.c b/drivers/gpu/drm/mediatek/mtk_drm_crtc.c
> index a5af4be..25cf063 100644
> --- a/drivers/gpu/drm/mediatek/mtk_drm_crtc.c
> +++ b/drivers/gpu/drm/mediatek/mtk_drm_crtc.c
> @@ -283,6 +283,15 @@ 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 = DDP_COMPONENT_ID_MAX;
> +
> +               if (i > 0) {
> +                       struct mtk_ddp_comp *comp_prev;
> +
> +                       comp_prev = mtk_crtc->ddp_comp[i - 1];
> +                       prev = comp_prev->id;

Just

if (i > 0)
  prev = mtk_crtc->ddp_comp[i - 1]->id;
else
  prev = DDP_COMPONENT_ID_MAX;

> +               }
> +               mtk_ddp_comp_connect(comp, prev);
>
>                 mtk_ddp_comp_config(comp, width, height, vrefresh, bpc);
>                 mtk_ddp_comp_start(comp);
> @@ -292,10 +301,19 @@ 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 = 0;

No need to init to 0.

>
>                 plane_state = to_mtk_plane_state(plane->state);
> -               mtk_ddp_comp_layer_config(mtk_crtc->ddp_comp[0], 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);
>         }
>
>         return 0;
> @@ -340,6 +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 = 0;

ditto, don't init to 0.

>
>         /*
>          * TODO: instead of updating the registers here, we should prepare
> @@ -362,7 +382,15 @@ 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;
>                         }
>                 }
> @@ -604,6 +632,10 @@ 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 &&
> +           mtk_ddp_comp_get_type(mtk_crtc->ddp_comp[1]->id) == MTK_DISP_OVL)
> +               mtk_crtc->layer_nr +=
> +               mtk_ddp_comp_layer_nr(mtk_crtc->ddp_comp[1]);
>         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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