CMDQ is used to update display register in vblank period, so it should be execute in next vblank. If it fail to execute in next 2 vblank, tiemout happen.
Signed-off-by: Chun-Kuang Hu chunkuang.hu@kernel.org --- drivers/gpu/drm/mediatek/mtk_drm_crtc.c | 13 ++++++++++++- 1 file changed, 12 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/mediatek/mtk_drm_crtc.c b/drivers/gpu/drm/mediatek/mtk_drm_crtc.c index f99c9d2032b8..71f770e25ad2 100644 --- a/drivers/gpu/drm/mediatek/mtk_drm_crtc.c +++ b/drivers/gpu/drm/mediatek/mtk_drm_crtc.c @@ -52,6 +52,7 @@ struct mtk_drm_crtc { struct mbox_client cmdq_cl; struct mbox_chan *cmdq_chan; u32 cmdq_event; + u32 cmdq_vblank_cnt; #endif
struct device *mmsys_dev; @@ -244,6 +245,7 @@ static void ddp_cmdq_cb(struct mbox_client *cl, void *mssg) struct mtk_drm_crtc *mtk_crtc = container_of(cl, struct mtk_drm_crtc, cmdq_cl); struct cmdq_cb_data *data = mssg;
+ mtk_crtc->cmdq_vblank_cnt = 0; cmdq_pkt_destroy(mtk_crtc->cmdq_chan, data->pkt); } #endif @@ -494,6 +496,11 @@ static void mtk_drm_crtc_hw_config(struct mtk_drm_crtc *mtk_crtc) cmdq_handle->pa_base, cmdq_handle->cmd_buf_size, DMA_TO_DEVICE); + /* + * CMDQ command should execute in next vblank, + * If it fail to execute in next 2 vblank, timeout happen. + */ + mtk_crtc->cmdq_vblank_cnt = 2; cmdq_pkt_flush_async(mtk_crtc->cmdq_chan, cmdq_handle); } #endif @@ -674,10 +681,14 @@ void mtk_crtc_ddp_irq(struct drm_crtc *crtc, struct mtk_ddp_comp *comp)
#if IS_REACHABLE(CONFIG_MTK_CMDQ) if (!priv->data->shadow_register && !mtk_crtc->cmdq_chan) + mtk_crtc_ddp_config(crtc, NULL); + else if (mtk_crtc->cmdq_vblank_cnt && --mtk_crtc->cmdq_vblank_cnt == 0) + DRM_ERROR("mtk_crtc %d CMDQ execute command timeout!\n", + drm_crtc_index(&mtk_crtc->base)); #else if (!priv->data->shadow_register) -#endif mtk_crtc_ddp_config(crtc, NULL); +#endif
mtk_drm_finish_page_flip(mtk_crtc); }