On Wed, Apr 06, 2016 at 08:34:51PM +0800, Keguang Zhang wrote:
> @@ -527,6 +527,15 @@ config ZX_DMA
> help
> Support the DMA engine for ZTE ZX296702 platform devices.
>
> +config DMA_LOONGSON1
The kconfig and makefile is sorted alphabetically, pls arrage these entries
accordingly
> +
> + /*memorize the physical address of descriptor */
bad comment style
> + /*allocate DMA descriptors */
here and other places too :(
> +static enum dma_status ls1x_dma_tx_status(struct dma_chan *chan,
> + dma_cookie_t cookie,
> + struct dma_tx_state *txstate)
> +{
> + struct ls1x_dma_chan *dma_chan = to_ls1x_dma_chan(chan);
> + struct ls1x_dma_desc *dma_desc = dma_chan->dma_desc;
> + struct virt_dma_desc *vdesc;
> + enum dma_status status;
> + unsigned int residue = 0;
> + unsigned long flags;
> +
> + status = dma_cookie_status(chan, cookie, txstate);
> + if ((status == DMA_COMPLETE) || !txstate)
> + return status;
> +
> + spin_lock_irqsave(&dma_chan->vchan.lock, flags);
> +
> + vdesc = vchan_find_desc(&dma_chan->vchan, cookie);
> + if (vdesc)
> + /* not yet processed */
> + residue = ls1x_dma_desc_residue(to_ls1x_dma_desc(vdesc), 0);
If your usage queries reside repeatedly, then it might make sense to store
the size which is residue here
--
~Vinod
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