linux-kernel - Re: [PATCH 3/3] drm/mediatek: Fix cursor plane is not config when primary is updating

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Date:   Wed, 29 Sep 2021 22:55:46 +0800
From:   Chun-Kuang Hu <chunkuang.hu@...nel.org>
To:     "jason-jh.lin" <jason-jh.lin@...iatek.com>
Cc:     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>,
        Yongqiang Niu <yongqiang.niu@...iatek.com>,
        DRI Development <dri-devel@...ts.freedesktop.org>,
        "moderated list:ARM/Mediatek SoC support" 
        <linux-mediatek@...ts.infradead.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        Hsin-Yi Wang <hsinyi@...omium.org>, fshao@...omium.org,
        Nancy Lin <nancy.lin@...iatek.com>, singo.chang@...iatek.com
Subject: Re: [PATCH 3/3] drm/mediatek: Fix cursor plane is not config when
 primary is updating

Hi, Jason:

jason-jh.lin <jason-jh.lin@...iatek.com> 於 2021年9月29日 週三 下午3:02寫道：
>
> If cursor plane has updated but primary plane config task is not
> finished, mtk_drm_crtc_update_config will call mbox_flush() to clear
> all task in current GCE thread and let cursor plane re-send a new
> GCE task with cursor + primary plane config to replace the unfinished
> GCE task.
>
> So the plane config flag should not be cleared when mailbox callback
> with a error status.
>
> Fixes: 9efb16c2fdd6 ("drm/mediatek: Clear pending flag when cmdq packet is done")
> Signed-off-by: jason-jh.lin <jason-jh.lin@...iatek.com>
> ---
>  drivers/gpu/drm/mediatek/mtk_drm_crtc.c | 3 +++
>  1 file changed, 3 insertions(+)
>
> diff --git a/drivers/gpu/drm/mediatek/mtk_drm_crtc.c b/drivers/gpu/drm/mediatek/mtk_drm_crtc.c
> index 06342df2a0be..fb0d9424acec 100644
> --- a/drivers/gpu/drm/mediatek/mtk_drm_crtc.c
> +++ b/drivers/gpu/drm/mediatek/mtk_drm_crtc.c
> @@ -281,6 +281,9 @@ static void ddp_cmdq_cb(struct mbox_client *cl, void *mssg)
>         struct mtk_crtc_state *state;
>         unsigned int i;
>
> +       if (data->sta != 0)

data->sta is now the standard error code, so data->sta < 0 is an error.

Regards,
Chun-Kuang.

> +               return;
> +
>         state = to_mtk_crtc_state(mtk_crtc->base.state);
>
>         state->pending_config = false;
> --
> 2.18.0
>