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dmaengine: sirf: set dma residue based on the current dma transfer position
read SIRFSOC_DMA_CH_ADDR register to get current dma transfer position, then update dma residue so that things like ALSA drivers work as ALSA drivers need the right residue value. Signed-off-by: Rongjun Ying <Rongjun.Ying@csr.com> Signed-off-by: Barry Song <Baohua.Song@csr.com> Signed-off-by: Vinod Koul <vinod.koul@intel.com>
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1 changed files with 17 additions and 0 deletions
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@ -466,12 +466,29 @@ static enum dma_status
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sirfsoc_dma_tx_status(struct dma_chan *chan, dma_cookie_t cookie,
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struct dma_tx_state *txstate)
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{
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struct sirfsoc_dma *sdma = dma_chan_to_sirfsoc_dma(chan);
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struct sirfsoc_dma_chan *schan = dma_chan_to_sirfsoc_dma_chan(chan);
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unsigned long flags;
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enum dma_status ret;
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struct sirfsoc_dma_desc *sdesc;
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int cid = schan->chan.chan_id;
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unsigned long dma_pos;
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unsigned long dma_request_bytes;
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unsigned long residue;
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spin_lock_irqsave(&schan->lock, flags);
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sdesc = list_first_entry(&schan->active, struct sirfsoc_dma_desc,
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node);
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dma_request_bytes = (sdesc->xlen + 1) * (sdesc->ylen + 1) *
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(sdesc->width * SIRFSOC_DMA_WORD_LEN);
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ret = dma_cookie_status(chan, cookie, txstate);
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dma_pos = readl_relaxed(sdma->base + cid * 0x10 + SIRFSOC_DMA_CH_ADDR)
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<< 2;
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residue = dma_request_bytes - (dma_pos - sdesc->addr);
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dma_set_residue(txstate, residue);
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spin_unlock_irqrestore(&schan->lock, flags);
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return ret;
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