tree d0f0bcb04c633885e26daba009a55a7b32c35106
parent 6d0709d2000ae7dbead759715f57ba381b7057bb
author Huang Shijie <b32955@freescale.com> 1322792185 +0800
committer Vinod Koul <vinod.koul@linux.intel.com> 1323053546 +0530

IMX/SDMA : save the real count for one DMA transaction.

When we use the SDMA in the UART driver(such as imx6q), we will
meet one situation:
  Assume we set 64 bytes for the RX DMA buffer.
  The RX DMA buffer has received some data, but not full.
  An Aging DMA request will be received by the SDMA controller if we enable the
  IDDMAEN(UCR4[6]) in this case.

So the UART driver needs to know the count of the real received bytes,
and push them to upper layer.

Add two new fields to sdmac, and update the `residue` in sdma_tx_status().

Signed-off-by: Huang Shijie <b32955@freescale.com>
Signed-off-by: Vinod Koul <vinod.koul@linux.intel.com>