Re: [PATCH v3 2/2] drm/mediatek: Fix iommu fault during crtc enabling

[AngeloGioacchino Del Regno]

Il 10/07/23 11:32, Jason-JH.Lin ha scritto:
> 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.
>
> Fixes: 119f5173628a ("drm/mediatek: Add DRM Driver for Mediatek SoC MT8173.")
> Signed-off-by: Jason-JH.Lin <jason-jh.lin@xxxxxxxxxxxx>

Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@xxxxxxxxxxxxx>

> ---
>   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,