Revert "drm/mediatek: Detect CMDQ execution timeout"

This reverts commit 8cdcb365.

Commit c1ec54b7
("drm/mediatek: Use mailbox rx_callback instead of cmdq_task_cb")
would cause numerous mtk cmdq mailbox driver warning:

WARNING: CPU: 0 PID: 0 at drivers/mailbox/mtk-cmdq-mailbox.c:198
cmdq_task_exec_done+0xb8/0xe0

So revert that patch and all the patches depend on that patch.
Reported-by: Enric Balletbo Serra <eballetbo@gmail.com>
Tested-by: Enric Balletbo Serra <eballetbo@gmail.com>
Signed-off-by: Chun-Kuang Hu <chunkuang.hu@kernel.org>

drivers/gpu/drm/mediatek/mtk_drm_crtc.c

@@ -55,7 +55,6 @@ 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;
@@ -270,7 +269,6 @@ 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
@@ -526,11 +524,6 @@ 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);
 	}
@@ -547,14 +540,11 @@ 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)
-		mtk_crtc_ddp_config(crtc, NULL);
 #endif
+		mtk_crtc_ddp_config(crtc, NULL);
+
 	mtk_drm_finish_page_flip(mtk_crtc);
 }