[PATCH] drm/mediatek: Use CPU when fail to get cmdq event

[Chun-Kuang Hu]

Chun-Kuang Hu <chunkuang.hu at kernel.org> 於 2020年9月3日 週四 上午6:06寫道：
>
> Even though cmdq client is created successfully, without the cmdq event,
> cmdq could not work correctly, so use CPU when fail to get cmdq event.

Applied to mediatek-drm-fixes [1].

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

Regards,
Chun-Kuang.

>
> Fixes: 60fa8c13ab1a ("drm/mediatek: Move gce event property to mutex device node")
> Signed-off-by: Chun-Kuang Hu <chunkuang.hu at kernel.org>
> ---
>  drivers/gpu/drm/mediatek/mtk_drm_crtc.c | 20 +++++++++++++-------
>  1 file changed, 13 insertions(+), 7 deletions(-)
>
> diff --git a/drivers/gpu/drm/mediatek/mtk_drm_crtc.c b/drivers/gpu/drm/mediatek/mtk_drm_crtc.c
> index 3fc5511330b9..4d29568be3f5 100644
> --- a/drivers/gpu/drm/mediatek/mtk_drm_crtc.c
> +++ b/drivers/gpu/drm/mediatek/mtk_drm_crtc.c
> @@ -831,13 +831,19 @@ int mtk_drm_crtc_create(struct drm_device *drm_dev,
>                         drm_crtc_index(&mtk_crtc->base));
>                 mtk_crtc->cmdq_client = NULL;
>         }
> -       ret = of_property_read_u32_index(priv->mutex_node,
> -                                        "mediatek,gce-events",
> -                                        drm_crtc_index(&mtk_crtc->base),
> -                                        &mtk_crtc->cmdq_event);
> -       if (ret)
> -               dev_dbg(dev, "mtk_crtc %d failed to get mediatek,gce-events property\n",
> -                       drm_crtc_index(&mtk_crtc->base));
> +
> +       if (mtk_crtc->cmdq_client) {
> +               ret = of_property_read_u32_index(priv->mutex_node,
> +                                                "mediatek,gce-events",
> +                                                drm_crtc_index(&mtk_crtc->base),
> +                                                &mtk_crtc->cmdq_event);
> +               if (ret) {
> +                       dev_dbg(dev, "mtk_crtc %d failed to get mediatek,gce-events property\n",
> +                               drm_crtc_index(&mtk_crtc->base));
> +                       cmdq_mbox_destroy(mtk_crtc->cmdq_client);
> +                       mtk_crtc->cmdq_client = NULL;
> +               }
> +       }
>  #endif
>         return 0;
>  }
> --
> 2.17.1
>