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>

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;
 }