[PATCH v4 2/4] dw_dmac: introduce total_len field in struct dw_desc

Andy Shevchenko
2013-01-25T09:48:44Z

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>
---
drivers/dma/dw_dmac.c | 12 ++++++------
drivers/dma/dw_dmac_regs.h | 1 +
2 files changed, 7 insertions(+), 6 deletions(-)

diff --git a/drivers/dma/dw_dmac.c b/drivers/dma/dw_dmac.c
index e4e4ff2..7b5a088 100644
--- a/drivers/dma/dw_dmac.c
+++ b/drivers/dma/dw_dmac.c
@@ -335,18 +335,18 @@ 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);
}
}

@@ -776,7 +776,7 @@ 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;

@@ -939,7 +939,7 @@ 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 13000d2..833b4cf 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)
--
1.7.10.4