On 23-07-20, 10:34, EastL wrote:

On Wed, 2020-07-15 at 11:49 +0530, Vinod Koul wrote:

quoted

On 02-07-20, 15:06, EastL Lee wrote:

quoted

 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

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