[PATCH] dma: omap-dma: add support for pause of non-cyclic transfers

[Sebastian Andrzej Siewior]

This DMA driver is used by 8250-omap on DRA7-evm. There is one
requirement that is to pause a transfer. This is currently used on the RX
side. It is possible that the UART HW aborted the RX (UART's RX-timeout)
but the DMA controller starts the transfer shortly after.
Before we can manually purge the FIFO we need to pause the transfer,
check how many bytes it already received and terminate the transfer
without it making any progress.

>From testing on the TX side it seems that it is possible that we invoke
pause once the transfer has completed which is indicated by the missing
CCR_ENABLE bit but before the interrupt has been noticed. In that case the
interrupt will come even after disabling it.

The AM572x manual says that we have to wait for the CCR_RD_ACTIVE &
CCR_WR_ACTIVE bits to be gone before programming it again here is the
drain loop. Also it looks like without the drain the TX-transfer makes
sometimes progress.

One note: The pause + resume combo is broken because after resume the
the complete transfer will be programmed again. That means the already
transferred bytes (until the pause event) will be sent again. This is
currently not important for my UART user because it does only pause +
terminate.

Cc: <stable@xxxxxxxxxxxxxxx>
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@xxxxxxxxxxxxx>
---
 drivers/dma/omap-dma.c | 54 ++++++++++++++++++++++++++++++++++++++------------
 1 file changed, 41 insertions(+), 13 deletions(-)

diff --git a/drivers/dma/omap-dma.c b/drivers/dma/omap-dma.c
index 249445c8a4c6..6b8497203caf 100644
--- a/drivers/dma/omap-dma.c
+++ b/drivers/dma/omap-dma.c
@@ -299,7 +299,7 @@ static void omap_dma_start(struct omap_chan *c, struct omap_desc *d)
 	omap_dma_chan_write(c, CCR, d->ccr | CCR_ENABLE);
 }
 
-static void omap_dma_stop(struct omap_chan *c)
+static int omap_dma_stop(struct omap_chan *c)
 {
 	struct omap_dmadev *od = to_omap_dma_dev(c->vc.chan.device);
 	uint32_t val;
@@ -342,8 +342,26 @@ static void omap_dma_stop(struct omap_chan *c)
 
 		omap_dma_glbl_write(od, OCP_SYSCONFIG, sysconfig);
 	} else {
+		int i = 0;
+
+		if (!(val & CCR_ENABLE))
+			return -EINVAL;
+
 		val &= ~CCR_ENABLE;
 		omap_dma_chan_write(c, CCR, val);
+		do {
+			val = omap_dma_chan_read(c, CCR);
+			if (!(val & (CCR_RD_ACTIVE | CCR_WR_ACTIVE)))
+				break;
+			if (i > 100)
+				break;
+			udelay(5);
+		} while (1);
+
+		if (val & (CCR_RD_ACTIVE | CCR_WR_ACTIVE))
+			dev_err(c->vc.chan.device->dev,
+				"DMA drain did not complete on lch %d\n",
+				c->dma_ch);
 	}
 
 	mb();
@@ -358,6 +376,7 @@ static void omap_dma_stop(struct omap_chan *c)
 
 		omap_dma_chan_write(c, CLNK_CTRL, val);
 	}
+	return 0;
 }
 
 static void omap_dma_start_sg(struct omap_chan *c, struct omap_desc *d,
@@ -728,6 +747,8 @@ static enum dma_status omap_dma_tx_status(struct dma_chan *chan,
 	} else {
 		txstate->residue = 0;
 	}
+	if (ret == DMA_IN_PROGRESS && c->paused)
+		ret = DMA_PAUSED;
 	spin_unlock_irqrestore(&c->vc.lock, flags);
 
 	return ret;
@@ -1053,28 +1074,33 @@ static int omap_dma_terminate_all(struct dma_chan *chan)
 static int omap_dma_pause(struct dma_chan *chan)
 {
 	struct omap_chan *c = to_omap_dma_chan(chan);
+	struct omap_dmadev *od = to_omap_dma_dev(chan->device);
+	unsigned long flags;
+	int ret = -EINVAL;
 
-	/* Pause/Resume only allowed with cyclic mode */
-	if (!c->cyclic)
-		return -EINVAL;
+	spin_lock_irqsave(&od->irq_lock, flags);
 
-	if (!c->paused) {
-		omap_dma_stop(c);
-		c->paused = true;
+	if (!c->paused && c->desc) {
+		ret = omap_dma_stop(c);
+		if (!ret)
+			c->paused = true;
 	}
 
-	return 0;
+	spin_unlock_irqrestore(&od->irq_lock, flags);
+
+	return ret;
 }
 
 static int omap_dma_resume(struct dma_chan *chan)
 {
 	struct omap_chan *c = to_omap_dma_chan(chan);
+	struct omap_dmadev *od = to_omap_dma_dev(chan->device);
+	unsigned long flags;
+	int ret = -EINVAL;
 
-	/* Pause/Resume only allowed with cyclic mode */
-	if (!c->cyclic)
-		return -EINVAL;
+	spin_lock_irqsave(&od->irq_lock, flags);
 
-	if (c->paused) {
+	if (c->paused && c->desc) {
 		mb();
 
 		/* Restore channel link register */
@@ -1082,9 +1108,11 @@ static int omap_dma_resume(struct dma_chan *chan)
 
 		omap_dma_start(c, c->desc);
 		c->paused = false;
+		ret = 0;
 	}
+	spin_unlock_irqrestore(&od->irq_lock, flags);
 
-	return 0;
+	return ret;
 }
 
 static int omap_dma_chan_init(struct omap_dmadev *od)
-- 
2.5.0

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