usb: dwc3: core: only setting the dma_mask when needed

If the probe drivers have already set the dma_mask, not
replacing the value.

Signed-off-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>

1 files changed, 5 insertions, 3 deletions

diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c
index ddfe7718e4a3..13843004815c 100644
--- a/drivers/usb/dwc3/core.c
+++ b/drivers/usb/dwc3/core.c
@@ -715,9 +715,11 @@ static int dwc3_probe(struct platform_device *pdev)
         spin_lock_init(&dwc->lock);
         platform_set_drvdata(pdev, dwc);
 
-        dev->dma_mask   = dev->parent->dma_mask;
-        dev->dma_parms  = dev->parent->dma_parms;
-        dma_set_coherent_mask(dev, dev->parent->coherent_dma_mask);
+        if (!dev->dma_mask) {
+                dev->dma_mask = dev->parent->dma_mask;
+                dev->dma_parms = dev->parent->dma_parms;
+                dma_set_coherent_mask(dev, dev->parent->coherent_dma_mask);
+        }
 
         pm_runtime_enable(dev);
         pm_runtime_get_sync(dev);