From add93b578edda2a952b9b481ce8da2a9dc412cee Mon Sep 17 00:00:00 2001 From: Rongjun Ying Date: Tue, 14 May 2013 23:03:20 +0800 Subject: [PATCH] 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 Signed-off-by: Barry Song Signed-off-by: Vinod Koul --- drivers/dma/sirf-dma.c | 17 +++++++++++++++++ 1 file changed, 17 insertions(+) diff --git a/drivers/dma/sirf-dma.c b/drivers/dma/sirf-dma.c index 1765a0a2736d..716b23e4f327 100644 --- a/drivers/dma/sirf-dma.c +++ b/drivers/dma/sirf-dma.c @@ -466,12 +466,29 @@ static enum dma_status sirfsoc_dma_tx_status(struct dma_chan *chan, dma_cookie_t cookie, struct dma_tx_state *txstate) { + struct sirfsoc_dma *sdma = dma_chan_to_sirfsoc_dma(chan); struct sirfsoc_dma_chan *schan = dma_chan_to_sirfsoc_dma_chan(chan); unsigned long flags; enum dma_status ret; + struct sirfsoc_dma_desc *sdesc; + int cid = schan->chan.chan_id; + unsigned long dma_pos; + unsigned long dma_request_bytes; + unsigned long residue; spin_lock_irqsave(&schan->lock, flags); + + sdesc = list_first_entry(&schan->active, struct sirfsoc_dma_desc, + node); + dma_request_bytes = (sdesc->xlen + 1) * (sdesc->ylen + 1) * + (sdesc->width * SIRFSOC_DMA_WORD_LEN); + ret = dma_cookie_status(chan, cookie, txstate); + dma_pos = readl_relaxed(sdma->base + cid * 0x10 + SIRFSOC_DMA_CH_ADDR) + << 2; + residue = dma_request_bytes - (dma_pos - sdesc->addr); + dma_set_residue(txstate, residue); + spin_unlock_irqrestore(&schan->lock, flags); return ret; -- 2.20.1