Hi, Jason:
jason-jh.lin <jason-jh.lin@xxxxxxxxxxxx> 於 2021年12月2日 週四 下午2:41寫道：
>
> mtk_drm_crtc_atomic_disable will send an async cmd to cmdq driver,
> so it may not finish when cmdq_suspend is called sometimes.
>
> Add wait_for_event after sending async disable plane cmd to make
> sure the lastest cmd is done before cmdq_suspend.
Reviewed-by: Chun-Kuang Hu <chunkuang.hu@xxxxxxxxxx>
>
> Signed-off-by: jason-jh.lin <jason-jh.lin@xxxxxxxxxxxx>
> ---
> drivers/gpu/drm/mediatek/mtk_drm_crtc.c | 12 ++++++++++++
> 1 file changed, 12 insertions(+)
>
> diff --git a/drivers/gpu/drm/mediatek/mtk_drm_crtc.c b/drivers/gpu/drm/mediatek/mtk_drm_crtc.c
> index 62529a954b62..0b4012335e7a 100644
> --- a/drivers/gpu/drm/mediatek/mtk_drm_crtc.c
> +++ b/drivers/gpu/drm/mediatek/mtk_drm_crtc.c
> @@ -56,6 +56,7 @@ struct mtk_drm_crtc {
> struct cmdq_pkt cmdq_handle;
> u32 cmdq_event;
> u32 cmdq_vblank_cnt;
> + wait_queue_head_t cb_blocking_queue;
> #endif
>
> struct device *mmsys_dev;
> @@ -314,6 +315,7 @@ static void ddp_cmdq_cb(struct mbox_client *cl, void *mssg)
> }
>
> mtk_crtc->cmdq_vblank_cnt = 0;
> + wake_up(&mtk_crtc->cb_blocking_queue);
> }
> #endif
>
> @@ -700,6 +702,13 @@ static void mtk_drm_crtc_atomic_disable(struct drm_crtc *crtc,
> mtk_crtc->pending_planes = true;
>
> mtk_drm_crtc_update_config(mtk_crtc, false);
> +#if IS_REACHABLE(CONFIG_MTK_CMDQ)
> + /* Wait for planes to be disabled by cmdq */
> + if (mtk_crtc->cmdq_client.chan)
> + wait_event_timeout(mtk_crtc->cb_blocking_queue,
> + mtk_crtc->cmdq_vblank_cnt == 0,
> + msecs_to_jiffies(500));
> +#endif
> /* Wait for planes to be disabled */
> drm_crtc_wait_one_vblank(crtc);
>
> @@ -980,6 +989,9 @@ int mtk_drm_crtc_create(struct drm_device *drm_dev,
> mtk_crtc->cmdq_client.chan = NULL;
> }
> }
> +
> + /* for sending blocking cmd in crtc disable */
> + init_waitqueue_head(&mtk_crtc->cb_blocking_queue);
> }
> #endif
> return 0;
> --
> 2.18.0
>
