[PATCH v2] dmaengine: qcom: bam_dma: check if the runtime pm enabled

[Srinivas Kandagatla]

Disabling pm runtime at probe is not sufficient to get BAM working
on remotely controller instances. pm_runtime_get_sync() would return
-EACCES in such cases.
So check if runtime pm is enabled before returning error from bam functions.

Fixes: 5b4a68952a89 ("dmaengine: qcom: bam_dma: disable runtime pm on remote 
controlled")
Signed-off-by: Srinivas Kandagatla <srinivas.kandaga...@linaro.org>
---
 drivers/dma/qcom/bam_dma.c | 18 +++++++++++++-----
 1 file changed, 13 insertions(+), 5 deletions(-)

diff --git a/drivers/dma/qcom/bam_dma.c b/drivers/dma/qcom/bam_dma.c
index d29275b97e84..4a828c18099a 100644
--- a/drivers/dma/qcom/bam_dma.c
+++ b/drivers/dma/qcom/bam_dma.c
@@ -524,6 +524,14 @@ static int bam_alloc_chan(struct dma_chan *chan)
        return 0;
 }
 
+static int bam_pm_runtime_get_sync(struct device *dev)
+{
+       if (pm_runtime_enabled(dev))
+               return pm_runtime_get_sync(dev);
+
+       return 0;
+}
+
 /**
  * bam_free_chan - Frees dma resources associated with specific channel
  * @chan: specified channel
@@ -539,7 +547,7 @@ static void bam_free_chan(struct dma_chan *chan)
        unsigned long flags;
        int ret;
 
-       ret = pm_runtime_get_sync(bdev->dev);
+       ret = bam_pm_runtime_get_sync(bdev->dev);
        if (ret < 0)
                return;
 
@@ -720,7 +728,7 @@ static int bam_pause(struct dma_chan *chan)
        unsigned long flag;
        int ret;
 
-       ret = pm_runtime_get_sync(bdev->dev);
+       ret = bam_pm_runtime_get_sync(bdev->dev);
        if (ret < 0)
                return ret;
 
@@ -746,7 +754,7 @@ static int bam_resume(struct dma_chan *chan)
        unsigned long flag;
        int ret;
 
-       ret = pm_runtime_get_sync(bdev->dev);
+       ret = bam_pm_runtime_get_sync(bdev->dev);
        if (ret < 0)
                return ret;
 
@@ -852,7 +860,7 @@ static irqreturn_t bam_dma_irq(int irq, void *data)
        if (srcs & P_IRQ)
                tasklet_schedule(&bdev->task);
 
-       ret = pm_runtime_get_sync(bdev->dev);
+       ret = bam_pm_runtime_get_sync(bdev->dev);
        if (ret < 0)
                return ret;
 
@@ -969,7 +977,7 @@ static void bam_start_dma(struct bam_chan *bchan)
        if (!vd)
                return;
 
-       ret = pm_runtime_get_sync(bdev->dev);
+       ret = bam_pm_runtime_get_sync(bdev->dev);
        if (ret < 0)
                return;
 
-- 
2.16.2