diff options
| author | Markus Pargmann <mpa@pengutronix.de> | 2013-10-29 11:47:46 +0400 |
|---|---|---|
| committer | Vinod Koul <vinod.koul@intel.com> | 2013-11-13 14:08:30 +0400 |
| commit | 7b11304a3c11a24a8674a47e8fd136182f86b49d (patch) | |
| tree | 3d0db41ab357e9b9f4f38c56ab2d6cf1832df2c0 /drivers/dma/mxs-dma.c | |
| parent | b2d639890b0d3379e844f6bb3c90d67ab292c80b (diff) | |
| download | linux-7b11304a3c11a24a8674a47e8fd136182f86b49d.tar.xz | |
dma: mxs-dma: Report correct residue for cyclic DMA
Use the channel's buffer address register to calculate correct residue
value for tx_status.
Signed-off-by: Markus Pargmann <mpa@pengutronix.de>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
Diffstat (limited to 'drivers/dma/mxs-dma.c')
| -rw-r--r-- | drivers/dma/mxs-dma.c | 20 |
1 files changed, 19 insertions, 1 deletions
diff --git a/drivers/dma/mxs-dma.c b/drivers/dma/mxs-dma.c index 1d1b6e99993d..083e7f1a94f0 100644 --- a/drivers/dma/mxs-dma.c +++ b/drivers/dma/mxs-dma.c @@ -58,6 +58,8 @@ (((dma_is_apbh(d) && apbh_is_old(d)) ? 0x050 : 0x110) + (n) * 0x70) #define HW_APBHX_CHn_SEMA(d, n) \ (((dma_is_apbh(d) && apbh_is_old(d)) ? 0x080 : 0x140) + (n) * 0x70) +#define HW_APBHX_CHn_BAR(d, n) \ + (((dma_is_apbh(d) && apbh_is_old(d)) ? 0x070 : 0x130) + (n) * 0x70) /* * ccw bits definitions @@ -623,8 +625,24 @@ static enum dma_status mxs_dma_tx_status(struct dma_chan *chan, dma_cookie_t cookie, struct dma_tx_state *txstate) { struct mxs_dma_chan *mxs_chan = to_mxs_dma_chan(chan); + struct mxs_dma_engine *mxs_dma = mxs_chan->mxs_dma; + u32 residue = 0; + + if (mxs_chan->status == DMA_IN_PROGRESS && + mxs_chan->flags & MXS_DMA_SG_LOOP) { + struct mxs_dma_ccw *last_ccw; + u32 bar; + + last_ccw = &mxs_chan->ccw[mxs_chan->desc_count - 1]; + residue = last_ccw->xfer_bytes + last_ccw->bufaddr; + + bar = readl(mxs_dma->base + + HW_APBHX_CHn_BAR(mxs_dma, chan->chan_id)); + residue -= bar; + } - dma_set_tx_state(txstate, chan->completed_cookie, chan->cookie, 0); + dma_set_tx_state(txstate, chan->completed_cookie, chan->cookie, + residue); return mxs_chan->status; } |