linux-kernel - Re: [PATCH v4] drm/mediatek: check plane visibility in atomic

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Message-ID: <CAAOTY_-mB5EC7_fHzpn+NFPRxAHEzY-f5dRv3g1TKfR5Hui58A@mail.gmail.com>
Date:   Sat, 27 Jun 2020 10:35:46 +0800
From:   Chun-Kuang Hu <chunkuang.hu@...nel.org>
To:     Hsin-Yi Wang <hsinyi@...omium.org>
Cc:     Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        Chun-Kuang Hu <chunkuang.hu@...nel.org>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Matthias Brugger <matthias.bgg@...il.com>,
        DRI Development <dri-devel@...ts.freedesktop.org>,
        "moderated list:ARM/Mediatek SoC support" 
        <linux-mediatek@...ts.infradead.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        Yongqiang Niu <yongqiang.niu@...iatek.com>,
        Tomasz Figa <tfiga@...omium.org>
Subject: Re: [PATCH v4] drm/mediatek: check plane visibility in atomic_update

Hi, Hsin-Yi:

Hsin-Yi Wang <hsinyi@...omium.org> 於 2020年6月22日 週一 下午11:57寫道：
>
> Disable the plane if it's not visible. Otherwise mtk_ovl_layer_config()
> would proceed with invalid plane and we may see vblank timeout.
>

Applied to mediatek-drm-next [1], thanks.

[1] https://git.kernel.org/pub/scm/linux/kernel/git/chunkuang.hu/linux.git/log/?h=mediatek-drm-next

Regards,
Chun-Kuang.

> Fixes: 119f5173628a ("drm/mediatek: Add DRM Driver for Mediatek SoC MT8173.")
> Signed-off-by: Hsin-Yi Wang <hsinyi@...omium.org>
> Reviewed-by: Chun-Kuang Hu <chunkuang.hu@...nel.org>
> Reviewed-by: Tomasz Figa <tfiga@...omium.org>
> ---
> v4: fix commit message
> v3: Address comment
> v2: Add fixes tag
> ---
>  drivers/gpu/drm/mediatek/mtk_drm_plane.c | 25 ++++++++++++++----------
>  1 file changed, 15 insertions(+), 10 deletions(-)
>
> diff --git a/drivers/gpu/drm/mediatek/mtk_drm_plane.c b/drivers/gpu/drm/mediatek/mtk_drm_plane.c
> index c2bd683a87c8..92141a19681b 100644
> --- a/drivers/gpu/drm/mediatek/mtk_drm_plane.c
> +++ b/drivers/gpu/drm/mediatek/mtk_drm_plane.c
> @@ -164,6 +164,16 @@ static int mtk_plane_atomic_check(struct drm_plane *plane,
>                                                    true, true);
>  }
>
> +static void mtk_plane_atomic_disable(struct drm_plane *plane,
> +                                    struct drm_plane_state *old_state)
> +{
> +       struct mtk_plane_state *state = to_mtk_plane_state(plane->state);
> +
> +       state->pending.enable = false;
> +       wmb(); /* Make sure the above parameter is set before update */
> +       state->pending.dirty = true;
> +}
> +
>  static void mtk_plane_atomic_update(struct drm_plane *plane,
>                                     struct drm_plane_state *old_state)
>  {
> @@ -178,6 +188,11 @@ static void mtk_plane_atomic_update(struct drm_plane *plane,
>         if (!crtc || WARN_ON(!fb))
>                 return;
>
> +       if (!plane->state->visible) {
> +               mtk_plane_atomic_disable(plane, old_state);
> +               return;
> +       }
> +
>         gem = fb->obj[0];
>         mtk_gem = to_mtk_gem_obj(gem);
>         addr = mtk_gem->dma_addr;
> @@ -200,16 +215,6 @@ static void mtk_plane_atomic_update(struct drm_plane *plane,
>         state->pending.dirty = true;
>  }
>
> -static void mtk_plane_atomic_disable(struct drm_plane *plane,
> -                                    struct drm_plane_state *old_state)
> -{
> -       struct mtk_plane_state *state = to_mtk_plane_state(plane->state);
> -
> -       state->pending.enable = false;
> -       wmb(); /* Make sure the above parameter is set before update */
> -       state->pending.dirty = true;
> -}
> -
>  static const struct drm_plane_helper_funcs mtk_plane_helper_funcs = {
>         .prepare_fb = drm_gem_fb_prepare_fb,
>         .atomic_check = mtk_plane_atomic_check,
> --
> 2.27.0.111.gc72c7da667-goog
>