linux-kernel - Re: [PATCH v2 2/2] drm/mediatek: Fix iommu fault during crtc enabling

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Message-ID: <CAC=S1njmD1+12dS5x20XLR650nkRpkyM-dKjaierSLknuTPRuw@mail.gmail.com>
Date:   Mon, 10 Jul 2023 11:13:16 +0800
From:   Fei Shao <fshao@...omium.org>
To:     "Jason-JH.Lin" <jason-jh.lin@...iatek.com>
Cc:     Chun-Kuang Hu <chunkuang.hu@...nel.org>,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>,
        Alexandre Mergnat <amergnat@...libre.com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Jason-ch Chen <jason-ch.chen@...iatek.com>,
        Johnson Wang <johnson.wang@...iatek.com>,
        Singo Chang <singo.chang@...iatek.com>,
        Nancy Lin <nancy.lin@...iatek.com>,
        Shawn Sung <shawn.sung@...iatek.com>,
        dri-devel@...ts.freedesktop.org,
        linux-mediatek@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Project_Global_Chrome_Upstream_Group@...iatek.com
Subject: Re: [PATCH v2 2/2] drm/mediatek: Fix iommu fault during crtc enabling

Hi Jason,

On Mon, Jul 10, 2023 at 12:27 AM Jason-JH.Lin <jason-jh.lin@...iatek.com> wrote:
>
> OVL layer should not be enabled before crtc is enabled.
> The plane_state of drm_atomic_state is not sync to
> the plane_state stored in mtk_crtc during crtc enabling,
> so just set all planes to disabled.
>
Please add the "Fixes" tag before your S-o-b.

Regards,
Fei
> 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 d40142842f85..51d10e65004e 100644
> --- a/drivers/gpu/drm/mediatek/mtk_drm_crtc.c
> +++ b/drivers/gpu/drm/mediatek/mtk_drm_crtc.c
> @@ -410,6 +410,9 @@ static int mtk_crtc_ddp_hw_init(struct mtk_drm_crtc *mtk_crtc)
>                 unsigned int local_layer;
>
>                 plane_state = to_mtk_plane_state(plane->state);
> +
> +               /* should not enable layer before crtc enabled */
> +               plane_state->pending.enable = false;
>                 comp = mtk_drm_ddp_comp_for_plane(crtc, plane, &local_layer);
>                 if (comp)
>                         mtk_ddp_comp_layer_config(comp, local_layer,
> --
> 2.18.0
>
>