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authorGuennadi Liakhovetski <g.liakhovetski@gmx.de>2012-07-30 23:28:27 +0400
committerPaul Mundt <lethal@linux-sh.org>2012-08-01 08:48:52 +0400
commit4f46f8ac80416b0e8fd3aba6a0d842205fb29140 (patch)
tree1913a661d292e74ea13e2e1af38b21ef6e5fb1bc /drivers/dma/sh
parentac694dbdbc403c00e2c14d10bc7b8412cc378259 (diff)
downloadlinux-4f46f8ac80416b0e8fd3aba6a0d842205fb29140.tar.xz
dmaengine: shdma: restore partial transfer calculation
The recent shdma driver split has mistakenly removed support for partial DMA transfer size calculation on forced termination. This patch restores it. Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de> Acked-by: Vinod Koul <vinod.koul@linux.intel.com> Signed-off-by: Paul Mundt <lethal@linux-sh.org>
Diffstat (limited to 'drivers/dma/sh')
-rw-r--r--drivers/dma/sh/shdma-base.c9
-rw-r--r--drivers/dma/sh/shdma.c12
2 files changed, 21 insertions, 0 deletions
diff --git a/drivers/dma/sh/shdma-base.c b/drivers/dma/sh/shdma-base.c
index 27f5c781fd73..f4cd946d259d 100644
--- a/drivers/dma/sh/shdma-base.c
+++ b/drivers/dma/sh/shdma-base.c
@@ -483,6 +483,7 @@ static struct shdma_desc *shdma_add_desc(struct shdma_chan *schan,
new->mark = DESC_PREPARED;
new->async_tx.flags = flags;
new->direction = direction;
+ new->partial = 0;
*len -= copy_size;
if (direction == DMA_MEM_TO_MEM || direction == DMA_MEM_TO_DEV)
@@ -644,6 +645,14 @@ static int shdma_control(struct dma_chan *chan, enum dma_ctrl_cmd cmd,
case DMA_TERMINATE_ALL:
spin_lock_irqsave(&schan->chan_lock, flags);
ops->halt_channel(schan);
+
+ if (ops->get_partial && !list_empty(&schan->ld_queue)) {
+ /* Record partial transfer */
+ struct shdma_desc *desc = list_first_entry(&schan->ld_queue,
+ struct shdma_desc, node);
+ desc->partial = ops->get_partial(schan, desc);
+ }
+
spin_unlock_irqrestore(&schan->chan_lock, flags);
shdma_chan_ld_cleanup(schan, true);
diff --git a/drivers/dma/sh/shdma.c b/drivers/dma/sh/shdma.c
index 027c9be97654..f41bcc5267fd 100644
--- a/drivers/dma/sh/shdma.c
+++ b/drivers/dma/sh/shdma.c
@@ -381,6 +381,17 @@ static bool sh_dmae_chan_irq(struct shdma_chan *schan, int irq)
return true;
}
+static size_t sh_dmae_get_partial(struct shdma_chan *schan,
+ struct shdma_desc *sdesc)
+{
+ struct sh_dmae_chan *sh_chan = container_of(schan, struct sh_dmae_chan,
+ shdma_chan);
+ struct sh_dmae_desc *sh_desc = container_of(sdesc,
+ struct sh_dmae_desc, shdma_desc);
+ return (sh_desc->hw.tcr - sh_dmae_readl(sh_chan, TCR)) <<
+ sh_chan->xmit_shift;
+}
+
/* Called from error IRQ or NMI */
static bool sh_dmae_reset(struct sh_dmae_device *shdev)
{
@@ -632,6 +643,7 @@ static const struct shdma_ops sh_dmae_shdma_ops = {
.start_xfer = sh_dmae_start_xfer,
.embedded_desc = sh_dmae_embedded_desc,
.chan_irq = sh_dmae_chan_irq,
+ .get_partial = sh_dmae_get_partial,
};
static int __devinit sh_dmae_probe(struct platform_device *pdev)