At the pl330's probe point the device is already in runtime resume state. Hence to manage the device with runtime, the probe should do pm_runtime_put and remove should do pm_runtime_get to balance with probe. And in between, the device is being get/put at alloc_chan_resources and free_chan_resources. Signed-off-by: Inderpal Singh <inderpal.singh@xxxxxxxxxx> --- This patch is based on slave-dma's next branch and on top of the clean up patches at [1]. [1] https://lkml.org/lkml/2012/10/5/169 drivers/dma/pl330.c | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/drivers/dma/pl330.c b/drivers/dma/pl330.c index 2ee1538..5ae19ea 100644 --- a/drivers/dma/pl330.c +++ b/drivers/dma/pl330.c @@ -25,6 +25,7 @@ #include <linux/amba/pl330.h> #include <linux/scatterlist.h> #include <linux/of.h> +#include <linux/pm_runtime.h> #include "dmaengine.h" #define PL330_MAX_CHAN 8 @@ -2384,6 +2385,8 @@ static int pl330_alloc_chan_resources(struct dma_chan *chan) struct dma_pl330_dmac *pdmac = pch->dmac; unsigned long flags; + pm_runtime_get_sync(pdmac->ddma.dev); + spin_lock_irqsave(&pch->lock, flags); dma_cookie_init(chan); @@ -2392,6 +2395,7 @@ static int pl330_alloc_chan_resources(struct dma_chan *chan) pch->pl330_chid = pl330_request_channel(&pdmac->pif); if (!pch->pl330_chid) { spin_unlock_irqrestore(&pch->lock, flags); + pm_runtime_put(pdmac->ddma.dev); return -ENOMEM; } @@ -2470,6 +2474,8 @@ static void pl330_free_chan_resources(struct dma_chan *chan) list_splice_tail_init(&pch->work_list, &pch->dmac->desc_pool); spin_unlock_irqrestore(&pch->lock, flags); + + pm_runtime_put(pch->dmac->ddma.dev); } static enum dma_status @@ -2974,6 +2980,8 @@ pl330_probe(struct amba_device *adev, const struct amba_id *id) pi->pcfg.data_bus_width / 8, pi->pcfg.num_chan, pi->pcfg.num_peri, pi->pcfg.num_events); + pm_runtime_put(pd->dev); + return 0; probe_err5: @@ -3017,6 +3025,8 @@ static int __devexit pl330_remove(struct amba_device *adev) return -EBUSY; } + pm_runtime_get(pdmac->ddma.dev); + dma_async_device_unregister(&pdmac->ddma); amba_set_drvdata(adev, NULL); -- 1.7.9.5 -- To unsubscribe from this list: send the line "unsubscribe linux-samsung-soc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
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