media: mtk-vcodec: Add work queue for core hardware decode

Add work queue to process core hardware information.
First, get lat_buf from message queue, then call core
hardware of each codec(H264/VP9/AV1) to decode, finally
puts lat_buf back to the message.
Signed-off-by: Yunfei Dong <yunfei.dong@mediatek.com>
Reviewed-by: Steve Cho <stevecho@chromium.org>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>

drivers/media/platform/mtk-vcodec/mtk_vcodec_dec_drv.c

@@ -311,6 +311,18 @@ static int mtk_vcodec_probe(struct platform_device *pdev)
 		goto err_dec_pm;
 	}
 
+	if (IS_VDEC_LAT_ARCH(dev->vdec_pdata->hw_arch)) {
+		vdec_msg_queue_init_ctx(&dev->msg_queue_core_ctx, MTK_VDEC_CORE);
+		dev->core_workqueue =
+			alloc_ordered_workqueue("core-decoder",
+						WQ_MEM_RECLAIM | WQ_FREEZABLE);
+		if (!dev->core_workqueue) {
+			mtk_v4l2_err("Failed to create core workqueue");
+			ret = -EINVAL;
+			goto err_res;
+		}
+	}
+
 	for (i = 0; i < MTK_VDEC_HW_MAX; i++)
 		mutex_init(&dev->dec_mutex[i]);
 	mutex_init(&dev->dev_mutex);
@@ -322,7 +334,7 @@ static int mtk_vcodec_probe(struct platform_device *pdev)
 	ret = v4l2_device_register(&pdev->dev, &dev->v4l2_dev);
 	if (ret) {
 		mtk_v4l2_err("v4l2_device_register err=%d", ret);
-		goto err_res;
+		goto err_core_workq;
 	}
 
 	init_waitqueue_head(&dev->queue);
@@ -423,6 +435,9 @@ static int mtk_vcodec_probe(struct platform_device *pdev)
 	video_unregister_device(vfd_dec);
 err_dec_alloc:
 	v4l2_device_unregister(&dev->v4l2_dev);
+err_core_workq:
+	if (IS_VDEC_LAT_ARCH(dev->vdec_pdata->hw_arch))
+		destroy_workqueue(dev->core_workqueue);
 err_res:
 	mtk_vcodec_release_dec_pm(&dev->pm);
 err_dec_pm:

drivers/media/platform/mtk-vcodec/mtk_vcodec_drv.h

@@ -27,6 +27,7 @@
 #define MTK_VCODEC_MAX_PLANES	3
 #define MTK_V4L2_BENCHMARK	0
 #define WAIT_INTR_TIMEOUT_MS	1000
+#define IS_VDEC_LAT_ARCH(hw_arch) ((hw_arch) >= MTK_VDEC_LAT_SINGLE_CORE)
 
 /*
  * enum mtk_hw_reg_idx - MTK hw register base index
@@ -464,6 +465,7 @@ struct mtk_vcodec_enc_pdata {
  * @dec_capability: used to identify decode capability, ex: 4k
  * @enc_capability: used to identify encode capability
  *
+ * @core_workqueue: queue used for core hardware decode
  * @msg_queue_core_ctx: msg queue context used for core workqueue
  *
  * @subdev_dev: subdev hardware device
@@ -508,6 +510,7 @@ struct mtk_vcodec_dev {
 	unsigned int dec_capability;
 	unsigned int enc_capability;
 
+	struct workqueue_struct *core_workqueue;
 	struct vdec_msg_queue_ctx msg_queue_core_ctx;
 
 	void *subdev_dev[MTK_VDEC_HW_MAX];

drivers/media/platform/mtk-vcodec/vdec_msg_queue.c

@@ -68,6 +68,9 @@ int vdec_msg_queue_qbuf(struct vdec_msg_queue_ctx *msg_ctx, struct vdec_lat_buf
 
 	if (msg_ctx->hardware_index != MTK_VDEC_CORE)
 		wake_up_all(&msg_ctx->ready_to_use);
+	else
+		queue_work(buf->ctx->dev->core_workqueue,
+			   &buf->ctx->msg_queue.core_work);
 
 	mtk_v4l2_debug(3, "enqueue buf type: %d addr: 0x%p num: %d",
 		       msg_ctx->hardware_index, buf, msg_ctx->ready_num);
@@ -195,6 +198,34 @@ void vdec_msg_queue_deinit(struct vdec_msg_queue *msg_queue,
 	}
 }
 
+static void vdec_msg_queue_core_work(struct work_struct *work)
+{
+	struct vdec_msg_queue *msg_queue =
+		container_of(work, struct vdec_msg_queue, core_work);
+	struct mtk_vcodec_ctx *ctx =
+		container_of(msg_queue, struct mtk_vcodec_ctx, msg_queue);
+	struct mtk_vcodec_dev *dev = ctx->dev;
+	struct vdec_lat_buf *lat_buf;
+
+	lat_buf = vdec_msg_queue_dqbuf(&dev->msg_queue_core_ctx);
+	if (!lat_buf)
+		return;
+
+	ctx = lat_buf->ctx;
+	mtk_vcodec_set_curr_ctx(dev, ctx, MTK_VDEC_CORE);
+
+	lat_buf->core_decode(lat_buf);
+
+	mtk_vcodec_set_curr_ctx(dev, NULL, MTK_VDEC_CORE);
+	vdec_msg_queue_qbuf(&ctx->msg_queue.lat_ctx, lat_buf);
+
+	if (!list_empty(&ctx->msg_queue.lat_ctx.ready_queue)) {
+		mtk_v4l2_debug(3, "re-schedule to decode for core: %d",
+			       dev->msg_queue_core_ctx.ready_num);
+		queue_work(dev->core_workqueue, &msg_queue->core_work);
+	}
+}
+
 int vdec_msg_queue_init(struct vdec_msg_queue *msg_queue,
 			struct mtk_vcodec_ctx *ctx, core_decode_cb_t core_decode,
 			int private_size)
@@ -207,6 +238,7 @@ int vdec_msg_queue_init(struct vdec_msg_queue *msg_queue,
 		return 0;
 
 	vdec_msg_queue_init_ctx(&msg_queue->lat_ctx, MTK_VDEC_LAT0);
+	INIT_WORK(&msg_queue->core_work, vdec_msg_queue_core_work);
 	msg_queue->wdma_addr.size =
 		vde_msg_queue_get_trans_size(ctx->picinfo.buf_w,
 					     ctx->picinfo.buf_h);

drivers/media/platform/mtk-vcodec/vdec_msg_queue.h

@@ -68,6 +68,7 @@ struct vdec_lat_buf {
  * @wdma_addr: wdma address used for ube
  * @wdma_rptr_addr: ube read point
  * @wdma_wptr_addr: ube write point
+ * @core_work: core hardware work
  * @lat_ctx: used to store lat buffer list
  */
 struct vdec_msg_queue {
@@ -77,6 +78,7 @@ struct vdec_msg_queue {
 	u64 wdma_rptr_addr;
 	u64 wdma_wptr_addr;
 
+	struct work_struct core_work;
 	struct vdec_msg_queue_ctx lat_ctx;
 };