[PATCH V7] dmaengine: bcm2835-dma: Prevent suspend if DMA channel is busy

[Stefan Wahren]

bcm2835-dma provides the service to others, so it should suspend
late and resume early. Suspend should be prevented in case a DMA
channel is still busy.

Signed-off-by: Stefan Wahren <wahrenst at gmx.net>
---
 drivers/dma/bcm2835-dma.c | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)

Changes in V7:
- improve patch title and changelog
- add explaining comment and drop warning in suspend
- drop empty resume callback

Changes in V6:
- split out of series because there is no dependency

diff --git a/drivers/dma/bcm2835-dma.c b/drivers/dma/bcm2835-dma.c
index 7ba52dee40a9..20b10c15c696 100644
--- a/drivers/dma/bcm2835-dma.c
+++ b/drivers/dma/bcm2835-dma.c
@@ -875,6 +875,27 @@ static struct dma_chan *bcm2835_dma_xlate(struct of_phandle_args *spec,
 	return chan;
 }

+static int bcm2835_dma_suspend_late(struct device *dev)
+{
+	struct bcm2835_dmadev *od = dev_get_drvdata(dev);
+	struct bcm2835_chan *c, *next;
+
+	list_for_each_entry_safe(c, next, &od->ddev.channels,
+				 vc.chan.device_node) {
+		void __iomem *chan_base = c->chan_base;
+
+		/* Check if DMA channel is busy */
+		if (readl(chan_base + BCM2835_DMA_ADDR))
+			return -EBUSY;
+	}
+
+	return 0;
+}
+
+static const struct dev_pm_ops bcm2835_dma_pm_ops = {
+	SET_LATE_SYSTEM_SLEEP_PM_OPS(bcm2835_dma_suspend_late, NULL)
+};
+
 static int bcm2835_dma_probe(struct platform_device *pdev)
 {
 	struct bcm2835_dmadev *od;
@@ -1033,6 +1054,7 @@ static struct platform_driver bcm2835_dma_driver = {
 	.driver = {
 		.name = "bcm2835-dma",
 		.of_match_table = of_match_ptr(bcm2835_dma_of_match),
+		.pm = pm_ptr(&bcm2835_dma_pm_ops),
 	},
 };

--
2.34.1