dw_dmac: introduce total_len field in struct dw_desc

By this new field we distinguish a total length of the chain and the individual
length of each descriptor in the chain.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>

2 files changed, 7 insertions, 6 deletions

diff --git a/drivers/dma/dw_dmac.c b/drivers/dma/dw_dmac.c
index 721beafe8f7a..7f9f3324de17 100644
--- a/drivers/dma/dw_dmac.c
+++ b/drivers/dma/dw_dmac.c
@@ -333,18 +333,18 @@ dwc_descriptor_complete(struct dw_dma_chan *dwc, struct dw_desc *desc,
                 if (!(txd->flags & DMA_COMPL_SKIP_DEST_UNMAP)) {
                         if (txd->flags & DMA_COMPL_DEST_UNMAP_SINGLE)
                                 dma_unmap_single(parent, desc->lli.dar,
-                                                desc->len, DMA_FROM_DEVICE);
+                                        desc->total_len, DMA_FROM_DEVICE);
                         else
                                 dma_unmap_page(parent, desc->lli.dar,
-                                                desc->len, DMA_FROM_DEVICE);
+                                        desc->total_len, DMA_FROM_DEVICE);
                 }
                 if (!(txd->flags & DMA_COMPL_SKIP_SRC_UNMAP)) {
                         if (txd->flags & DMA_COMPL_SRC_UNMAP_SINGLE)
                                 dma_unmap_single(parent, desc->lli.sar,
-                                                desc->len, DMA_TO_DEVICE);
+                                        desc->total_len, DMA_TO_DEVICE);
                         else
                                 dma_unmap_page(parent, desc->lli.sar,
-                                                desc->len, DMA_TO_DEVICE);
+                                        desc->total_len, DMA_TO_DEVICE);
                 }
         }
 
@@ -774,7 +774,7 @@ dwc_prep_dma_memcpy(struct dma_chan *chan, dma_addr_t dest, dma_addr_t src,
 
         prev->lli.llp = 0;
         first->txd.flags = flags;
-        first->len = len;
+        first->total_len = len;
 
         return &first->txd;
 
@@ -937,7 +937,7 @@ slave_sg_fromdev_fill_desc:
                 prev->lli.ctllo |= DWC_CTLL_INT_EN;
 
         prev->lli.llp = 0;
-        first->len = total_len;
+        first->total_len = total_len;
 
         return &first->txd;
 
diff --git a/drivers/dma/dw_dmac_regs.h b/drivers/dma/dw_dmac_regs.h
index 13000d2b3352..833b4cf9843d 100644
--- a/drivers/dma/dw_dmac_regs.h
+++ b/drivers/dma/dw_dmac_regs.h
@@ -296,6 +296,7 @@ struct dw_desc {
         struct list_head                tx_list;
         struct dma_async_tx_descriptor  txd;
         size_t                          len;
+        size_t                          total_len;
 };
 
 #define to_dw_desc(h)   list_entry(h, struct dw_desc, desc_node)