linux-kernel - Re: [PATCH 2/2] drm/mediatek: Apply CMDQ control flow

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Date:   Mon, 18 Nov 2019 17:34:16 +0800
From:   Hsin-Yi Wang <hsinyi@...omium.org>
To:     Bibby Hsieh <bibby.hsieh@...iatek.com>
Cc:     David Airlie <airlied@...ux.ie>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Daniel Vetter <daniel.vetter@...ll.ch>,
        dri-devel@...ts.freedesktop.org,
        linux-mediatek@...ts.infradead.org,
        Nicolas Boichat <drinkcat@...omium.org>,
        Yongqiang Niu <yongqiang.niu@...iatek.com>,
        lkml <linux-kernel@...r.kernel.org>, tfiga@...omium.org,
        CK Hu <ck.hu@...iatek.com>,
        Thierry Reding <thierry.reding@...il.com>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        YT Shen <yt.shen@...iatek.com>,
        "moderated list:ARM/FREESCALE IMX / MXC ARM ARCHITECTURE" 
        <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH 2/2] drm/mediatek: Apply CMDQ control flow

On Fri, Aug 30, 2019 at 7:41 AM Bibby Hsieh <bibby.hsieh@...iatek.com> wrote:

> @@ -405,26 +458,69 @@ void mtk_drm_crtc_cursor_update(struct drm_crtc *crtc, struct drm_plane *plane,
>                 return;
>
>         mutex_lock(&priv->hw_lock);
> -       plane_helper_funcs->atomic_update(plane, plane_state);
> -       for (i = 0; i < mtk_crtc->layer_nr; i++) {
> -               struct drm_plane *plane = &mtk_crtc->planes[i];
> -               struct mtk_plane_state *plane_state;
> +       if (IS_ENABLED(CONFIG_MTK_CMDQ) && mtk_crtc->cmdq_client) {
> +               struct mtk_crtc_state *mtk_crtc_state =
> +                               to_mtk_crtc_state(crtc->state);
> +               struct mtk_cmdq_cb_data *cb_data;
> +
> +               mtk_crtc_state->cmdq_handle =
> +                               cmdq_pkt_create(mtk_crtc->cmdq_client,
> +                                               PAGE_SIZE);
> +               cmdq_pkt_clear_event(mtk_crtc_state->cmdq_handle,
> +                                    mtk_crtc->cmdq_event);
> +               cmdq_pkt_wfe(mtk_crtc_state->cmdq_handle, mtk_crtc->cmdq_event);
> +               plane_helper_funcs->atomic_update(plane, plane_state);
> +               cb_data = kmalloc(sizeof(*cb_data), GFP_KERNEL);
Check kmalloc failure?
> +               cb_data->cmdq_handle = mtk_crtc_state->cmdq_handle;
> +               cmdq_pkt_flush_async(mtk_crtc_state->cmdq_handle,
> +                                    ddp_cmdq_cursor_cb, cb_data);

> @@ -494,13 +599,29 @@ static void mtk_drm_crtc_atomic_flush(struct drm_crtc *crtc,
>                                       struct drm_crtc_state *old_crtc_state)
>  {
>         struct drm_atomic_state *old_atomic_state = old_crtc_state->state;
> +       struct drm_crtc_state *crtc_state = crtc->state;
> +       struct mtk_crtc_state *state = to_mtk_crtc_state(crtc_state);
> +       struct cmdq_pkt *cmdq_handle = state->cmdq_handle;
>         struct mtk_drm_crtc *mtk_crtc = to_mtk_crtc(crtc);
>         struct mtk_drm_private *priv = crtc->dev->dev_private;
> +       struct mtk_cmdq_cb_data *cb_data;
>         unsigned int pending_planes = 0;
>         int i;
>
> -       if (mtk_crtc->event)
> -               mtk_crtc->pending_needs_vblank = true;
> +       DRM_DEBUG_DRIVER("[CRTC:%u] [STATE:%p(%p)->%p(%p)]\n", crtc->base.id,
> +                        old_crtc_state, old_crtc_state->state,
> +                        crtc_state, crtc_state->state);
> +
> +       if (IS_ENABLED(CONFIG_MTK_CMDQ) && mtk_crtc->cmdq_client) {
> +               drm_atomic_state_get(old_atomic_state);
> +               cb_data = kmalloc(sizeof(*cb_data), GFP_KERNEL);
Check kmalloc failure?
> +               cb_data->state = old_crtc_state;
> +               cb_data->cmdq_handle = cmdq_handle;