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drm/mediatek: Detect CMDQ execution timeout

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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>
This commit is contained in:
Chun-Kuang Hu 2021-07-04 15:59:24 +08:00
parent f4be17cd5b
commit 8cdcb36534
1 changed files with 12 additions and 2 deletions
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14
drivers/gpu/drm/mediatek/mtk_drm_crtc.c
View file

@ -55,6 +55,7 @@ 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;
@ -269,6 +270,7 @@ 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;
mtk_drm_cmdq_pkt_destroy(mtk_crtc->cmdq_chan, data->pkt);
}
#endif
@ -524,6 +526,11 @@ static void mtk_drm_crtc_update_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;
mbox_send_message(mtk_crtc->cmdq_chan, cmdq_handle);
mbox_client_txdone(mtk_crtc->cmdq_chan, 0);
}
@ -540,11 +547,14 @@ static void mtk_crtc_ddp_irq(void *data)
#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 > 0 && --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);
}