[参考译文] AM62P：ads6311雷达摄像头已丢失帧捕获

static void ti_csi2rx_dma_callback(void *param,
				   const struct dmaengine_result *result)
{
	struct ti_csi2rx_buffer *buf = param;
	struct ti_csi2rx_ctx *ctx = buf->ctx;
	struct ti_csi2rx_dma *dma = &ctx->dma;
	unsigned long flags = 0;

	/*
	 * TODO: Derive the sequence number from the CSI2RX frame number
	 * hardware monitor registers.
	 */
	buf->vb.vb2_buf.timestamp = ktime_get_ns();
	buf->vb.sequence = ctx->sequence++;

	spin_lock_irqsave(&dma->lock, flags);

	WARN_ON(!list_is_first(&buf->list, &dma->submitted));
	if (0 == (ctx->ok_frame_cnt + ctx->ng_frame_cnt))
	{
 		ctx->rx_start = ktime_get();
	}

	if (result && (result->result != DMA_TRANS_NOERROR || result->residue != 0))
	{
#if 0 // The log may bring something can't restored unless reboot the system, according to Qingfeng's test.
		dev_err(ctx->csi->dev, "Failed DMA transfer for frame#%u of (stream: %d idx: %d, vc: %d),timestamp: %lld result=%d, residue=%u\n",
			buf->vb.sequence, ctx->stream, ctx->idx, ctx->vc, buf->vb.vb2_buf.timestamp, result->result, result->residue
			);
#endif
		ctx->ng_frame_cnt++;
		vb2_buffer_done(&buf->vb.vb2_buf, VB2_BUF_STATE_ERROR);
	} else {
		ctx->ok_frame_cnt++;
		vb2_buffer_done(&buf->vb.vb2_buf, VB2_BUF_STATE_DONE);
	}
	list_del(&buf->list);

	ti_csi2rx_dma_submit_pending(ctx);

	if (list_empty(&dma->submitted))
		dma->state = TI_CSI2RX_DMA_IDLE;

	spin_unlock_irqrestore(&dma->lock, flags);
}

root@am62pxx-evm:/run/media/data-mmcblk0p5/output/bin# cat /sys/devices/platform/bus@f0000/30102000.ticsi2rx/csi_rx_status
stream[0] ok: 352, ng: 2, total_fps: 1, ok_fps: 1
stream[1] ok: 278, ng: 78, total_fps: 1, ok_fps: 1
stream[2] ok: 353, ng: 0, total_fps: 1, ok_fps: 1
stream[3] ok: 355, ng: 0, total_fps: 1, ok_fps: 1