[PATCH RESEND] dmaengine: stm32-dma: Rework starting transfer management

[PATCH RESEND] dmaengine: stm32-dma: Rework starting transfer management

[M'boumba Cedric Madianga]

This patch reworks the way to manage transfer starting.
Now, starting DMA is only allowed when the channel is not busy.
Then, stm32_dma_start_transfer is declared as void.
At least, after each transfer completion, we start the next transfer if a
new descriptor as been queued in the issued list during an ongoing
transfer.

Signed-off-by: M'boumba Cedric Madianga <cedric.madianga@gmail.com>
Reviewed-by: Ludovic BARRE <ludovic.barre@st.com>
---
 drivers/dma/stm32-dma.c | 20 +++++++++-----------
 1 file changed, 9 insertions(+), 11 deletions(-)

diff --git a/drivers/dma/stm32-dma.c b/drivers/dma/stm32-dma.c
index 3056ce7..adb846c 100644
--- a/drivers/dma/stm32-dma.c
+++ b/drivers/dma/stm32-dma.c
@@ -421,7 +421,7 @@ static void stm32_dma_dump_reg(struct stm32_dma_chan *chan)
 	dev_dbg(chan2dev(chan), "SFCR:  0x%08x\n", sfcr);
 }
 
-static int stm32_dma_start_transfer(struct stm32_dma_chan *chan)
+static void stm32_dma_start_transfer(struct stm32_dma_chan *chan)
 {
 	struct stm32_dma_device *dmadev = stm32_dma_get_dev(chan);
 	struct virt_dma_desc *vdesc;
@@ -432,12 +432,12 @@ static int stm32_dma_start_transfer(struct stm32_dma_chan *chan)
 
 	ret = stm32_dma_disable_chan(chan);
 	if (ret < 0)
-		return ret;
+		return;
 
 	if (!chan->desc) {
 		vdesc = vchan_next_desc(&chan->vchan);
 		if (!vdesc)
-			return -EPERM;
+			return;
 
 		chan->desc = to_stm32_dma_desc(vdesc);
 		chan->next_sg = 0;
@@ -471,7 +471,7 @@ static int stm32_dma_start_transfer(struct stm32_dma_chan *chan)
 
 	chan->busy = true;
 
-	return 0;
+	dev_dbg(chan2dev(chan), "vchan %p: started\n", &chan->vchan);
 }
 
 static void stm32_dma_configure_next_sg(struct stm32_dma_chan *chan)
@@ -552,15 +552,13 @@ static void stm32_dma_issue_pending(struct dma_chan *c)
 {
 	struct stm32_dma_chan *chan = to_stm32_dma_chan(c);
 	unsigned long flags;
-	int ret;
 
 	spin_lock_irqsave(&chan->vchan.lock, flags);
-	if (!chan->busy) {
-		if (vchan_issue_pending(&chan->vchan) && !chan->desc) {
-			ret = stm32_dma_start_transfer(chan);
-			if ((!ret) && (chan->desc->cyclic))
-				stm32_dma_configure_next_sg(chan);
-		}
+	if (vchan_issue_pending(&chan->vchan) && !chan->desc && !chan->busy) {
+		dev_dbg(chan2dev(chan), "vchan %p: issued\n", &chan->vchan);
+		stm32_dma_start_transfer(chan);
+		if (chan->desc->cyclic)
+			stm32_dma_configure_next_sg(chan);
 	}
 	spin_unlock_irqrestore(&chan->vchan.lock, flags);
 }
-- 
1.9.1

Re: [PATCH RESEND] dmaengine: stm32-dma: Rework starting transfer management

[Vinod Koul]

On Mon, Jan 02, 2017 at 10:33:27AM +0100, M'boumba Cedric Madianga wrote:
> This patch reworks the way to manage transfer starting.
> Now, starting DMA is only allowed when the channel is not busy.
> Then, stm32_dma_start_transfer is declared as void.
> At least, after each transfer completion, we start the next transfer if a
> new descriptor as been queued in the issued list during an ongoing
> transfer.

ah sorry, i missed to push topic/stm32-dma. can you rebase onnthis and
resend again. Btw this fails as as well..

-- 
~Vinod

Re: [PATCH RESEND] dmaengine: stm32-dma: Rework starting transfer management

[M'boumba Cedric Madianga]

Hi Vinod,

> ah sorry, i missed to push topic/stm32-dma. can you rebase onnthis and
> resend again. Btw this fails as as well..
I have tried again and I don't have any issue.
Please see below my way of working and let me know if there is
something I don't understand:

slave-dma git://git.infradead.org/users/vkoul/slave-dma.git
$ git fetch slave-dma
$ git checkout -b dma-fixes slave-dma/topic/dma-fixes
$ git checkout -b dma-stm32 slave-dma/topic/stm32-dma
$ git rebase dma-fixes
First, rewinding head to replay your work on top of it...
Applying: dmaengine: stm32-dma: Fix typo in Kconfig
Applying: dt-bindings: stm32-dma: Fix typo regarding DMA client binding
Applying: dmaengine: stm32-dma: Rework starting transfer management
Applying: dmaengine: stm32-dma: Fix residue computation issue in cyclic mode
Applying: dmaengine: stm32-dma: Add synchronization support
Applying: dmaengine: stm32-dma: Add max_burst support

Best regards,

Cedric