Hi, Jason: Chun-Kuang Hu <chunkuang.hu@xxxxxxxxxx> 於 2021年12月3日 週五 上午7:21寫道： > > 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> Applied to mediatek-drm-next[1], thanks. [1] https://git.kernel.org/pub/scm/linux/kernel/git/chunkuang.hu/linux.git/log/?h=mediatek-drm-next Regards, Chun-Kuang > > > > > 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 > >
