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| author | Rongjun Ying <Rongjun.Ying@csr.com> | 2013-05-14 19:03:20 +0400 |
|---|---|---|
| committer | Vinod Koul <vinod.koul@intel.com> | 2013-07-05 10:10:39 +0400 |
| commit | add93b578edda2a952b9b481ce8da2a9dc412cee (patch) | |
| tree | c5409a24671e2f76beee0893a8f965d6a3cbe50f | |
| parent | 7bdc1e272a471062e8f310137c896e2355b46d13 (diff) | |
| download | linux-add93b578edda2a952b9b481ce8da2a9dc412cee.tar.xz | |
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>
| -rw-r--r-- | drivers/dma/sirf-dma.c | 17 |
1 files changed, 17 insertions, 0 deletions
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; |