[PATCH v2 2/2] drm/mediatek: Fix iommu fault during crtc enabling

[Fei Shao]

Hi Jason,

On Mon, Jul 10, 2023 at 12:27 AM Jason-JH.Lin <jason-jh.lin at mediatek.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 at mediatek.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
>
>