linux-kernel - Re: [PATCH v2 2/2] dmaengine: xilinx: xdma: Support cyclic transfers

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Date:   Thu, 28 Sep 2023 16:24:31 +0530
From:   Vinod Koul <vkoul@...nel.org>
To:     Miquel Raynal <miquel.raynal@...tlin.com>
Cc:     Lizhi Hou <lizhi.hou@....com>, Brian Xu <brian.xu@....com>,
        Raj Kumar Rampelli <raj.kumar.rampelli@....com>,
        Michal Simek <michal.simek@....com>, dmaengine@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 2/2] dmaengine: xilinx: xdma: Support cyclic transfers

On 22-09-23, 18:20, Miquel Raynal wrote:

> @@ -583,7 +690,36 @@ static int xdma_alloc_chan_resources(struct dma_chan *chan)
>  static enum dma_status xdma_tx_status(struct dma_chan *chan, dma_cookie_t cookie,
>  				      struct dma_tx_state *state)
>  {
> -	return dma_cookie_status(chan, cookie, state);
> +	struct xdma_chan *xdma_chan = to_xdma_chan(chan);
> +	struct xdma_desc *desc = NULL;
> +	struct virt_dma_desc *vd;
> +	enum dma_status ret;
> +	unsigned long flags;
> +	unsigned int period_idx;
> +	u32 residue = 0;
> +
> +	ret = dma_cookie_status(chan, cookie, state);
> +	if (ret == DMA_COMPLETE)
> +		return ret;
> +
> +	spin_lock_irqsave(&xdma_chan->vchan.lock, flags);
> +
> +	vd = vchan_find_desc(&xdma_chan->vchan, cookie);
> +	if (vd)
> +		desc = to_xdma_desc(vd);

vd is not used in below check, so should be done after below checks, why
do this for cyclic case?

Otherwise series lgtm, just fix the error reported by test bot

> +	if (!desc || !desc->cyclic) {
> +		spin_unlock_irqrestore(&xdma_chan->vchan.lock, flags);
> +		return ret;
> +	}
-- 
~Vinod