dw_dmac: Mark all tx_descriptors with DMA_CRTL_ACK after xfer finish

dwc_desc_get checks all descriptors for DMA_CTRL_ACK before allocating them for
transfers. And descriptors are not marked with DMA_CRTL_ACK after transfer
finishes. Thus descriptor once used is not usable again. This patch marks
descriptors with DMA_CRTL_ACK after dma xfer finishes

Signed-off-by: Viresh Kumar <viresh.kumar@st.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>

1 files changed, 7 insertions, 0 deletions

diff --git a/drivers/dma/dw_dmac.c b/drivers/dma/dw_dmac.c
index 711ebe954f5b..6ab440e532bf 100644
--- a/drivers/dma/dw_dmac.c
+++ b/drivers/dma/dw_dmac.c
@@ -198,6 +198,7 @@ dwc_descriptor_complete(struct dw_dma_chan *dwc, struct dw_desc *desc)
         dma_async_tx_callback           callback;
         void                            *param;
         struct dma_async_tx_descriptor  *txd = &desc->txd;
+        struct dw_desc                  *child;
 
         dev_vdbg(chan2dev(&dwc->chan), "descriptor %u complete\n", txd->cookie);
 
@@ -206,6 +207,12 @@ dwc_descriptor_complete(struct dw_dma_chan *dwc, struct dw_desc *desc)
         param = txd->callback_param;
 
         dwc_sync_desc_for_cpu(dwc, desc);
+
+        /* async_tx_ack */
+        list_for_each_entry(child, &desc->tx_list, desc_node)
+                async_tx_ack(&child->txd);
+        async_tx_ack(&desc->txd);
+
         list_splice_init(&desc->tx_list, &dwc->free_list);
         list_move(&desc->desc_node, &dwc->free_list);