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dmaengine: bcm2835-dma: Prevent suspend if DMA channel is busy

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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@gmx.net>
Link: https://lore.kernel.org/r/20241204165546.77941-1-wahrenst@gmx.net
Signed-off-by: Vinod Koul <vkoul@kernel.org>
This commit is contained in:
Stefan Wahren 2024-12-04 17:55:46 +01:00 committed by Vinod Koul
parent 68811c928f
commit 9602a843cb
1 changed files with 22 additions and 0 deletions
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22
drivers/dma/bcm2835-dma.c
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@ -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),
},
};