dmaengine: shdma: extend .device_terminate_all() to record partial transfer
This patch extends the .device_terminate_all() method of the shdma driver
to return number of bytes transfered in the current descriptor.
Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
diff --git a/drivers/dma/shdma.c b/drivers/dma/shdma.c
index ea6779f..5d17e09 100644
--- a/drivers/dma/shdma.c
+++ b/drivers/dma/shdma.c
@@ -587,6 +587,19 @@
if (!chan)
return;
+ dmae_halt(sh_chan);
+
+ spin_lock_bh(&sh_chan->desc_lock);
+ if (!list_empty(&sh_chan->ld_queue)) {
+ /* Record partial transfer */
+ struct sh_desc *desc = list_entry(sh_chan->ld_queue.next,
+ struct sh_desc, node);
+ desc->partial = (desc->hw.tcr - sh_dmae_readl(sh_chan, TCR)) <<
+ sh_chan->xmit_shift;
+
+ }
+ spin_unlock_bh(&sh_chan->desc_lock);
+
sh_dmae_chan_ld_cleanup(sh_chan, true);
}
@@ -701,6 +714,9 @@
/* Find the first not transferred desciptor */
list_for_each_entry(desc, &sh_chan->ld_queue, node)
if (desc->mark == DESC_SUBMITTED) {
+ dev_dbg(sh_chan->dev, "Queue #%d to %d: %u@%x -> %x\n",
+ desc->async_tx.cookie, sh_chan->id,
+ desc->hw.tcr, desc->hw.sar, desc->hw.dar);
/* Get the ld start address from ld_queue */
dmae_set_reg(sh_chan, &desc->hw);
dmae_start(sh_chan);