linux-kernel - Re: [PATCH v6 2/4] dmaengine: mediatek-cqdma: remove redundant queue structure

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Message-ID: <20200727094458.GU12965@vkoul-mobl>
Date:   Mon, 27 Jul 2020 15:14:58 +0530
From:   Vinod Koul <vkoul@...nel.org>
To:     EastL <EastL.Lee@...iatek.com>
Cc:     Sean Wang <sean.wang@...iatek.com>, robh+dt@...nel.org,
        mark.rutland@....com, matthias.bgg@...il.com,
        dmaengine@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org, devicetree@...r.kernel.org,
        wsd_upstream@...iatek.com, cc.hwang@...iatek.com
Subject: Re: [PATCH v6 2/4] dmaengine: mediatek-cqdma: remove redundant queue
 structure

On 23-07-20, 10:34, EastL wrote:
> On Wed, 2020-07-15 at 11:49 +0530, Vinod Koul wrote:
> > On 02-07-20, 15:06, EastL Lee wrote:
> > 
> > >  static enum dma_status mtk_cqdma_tx_status(struct dma_chan *c,
> > >  					   dma_cookie_t cookie,
> > >  					   struct dma_tx_state *txstate)
> > >  {
> > > -	struct mtk_cqdma_vchan *cvc = to_cqdma_vchan(c);
> > > -	struct mtk_cqdma_vdesc *cvd;
> > > -	struct virt_dma_desc *vd;
> > > -	enum dma_status ret;
> > > -	unsigned long flags;
> > > -	size_t bytes = 0;
> > > -
> > > -	ret = dma_cookie_status(c, cookie, txstate);
> > > -	if (ret == DMA_COMPLETE || !txstate)
> > > -		return ret;
> > > -
> > > -	spin_lock_irqsave(&cvc->vc.lock, flags);
> > > -	vd = mtk_cqdma_find_active_desc(c, cookie);
> > > -	spin_unlock_irqrestore(&cvc->vc.lock, flags);
> > > -
> > > -	if (vd) {
> > > -		cvd = to_cqdma_vdesc(vd);
> > > -		bytes = cvd->residue;
> > > -	}
> > > -
> > > -	dma_set_residue(txstate, bytes);
> > 
> > any reason why you want to remove setting residue?
> Because Mediatek CQDMA HW can't support residue.

And previously it did?
-- 
~Vinod