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authorMarkus Pargmann <mpa@pengutronix.de>2013-10-29 11:47:46 +0400
committerVinod Koul <vinod.koul@intel.com>2013-11-13 14:08:30 +0400
commit7b11304a3c11a24a8674a47e8fd136182f86b49d (patch)
tree3d0db41ab357e9b9f4f38c56ab2d6cf1832df2c0 /drivers/dma/mxs-dma.c
parentb2d639890b0d3379e844f6bb3c90d67ab292c80b (diff)
downloadlinux-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.c20
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;
}