usb: dwc3: leave default DMA for PCI devices

in case of a PCI dwc3 controller, leave the default DMA
mask. Calling of a 64 bit DMA mask breaks the driver on
cherrytrail based tablets like Cyberbook T116.

Fixes: 45d39448b4d0 ("usb: dwc3: support 64 bit DMA in platform driver")
Cc: stable <stable@vger.kernel.org>
Reported-by: Hans De Goede <hdegoede@redhat.com>
Tested-by: Fabio Aiuto <fabioaiuto83@gmail.com>
Tested-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Fabio Aiuto <fabioaiuto83@gmail.com>
Link: https://lore.kernel.org/r/20211113142959.27191-1-fabioaiuto83@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c
index 643239d..f4c0995 100644 (file)
--- a/drivers/usb/dwc3/core.c
+++ b/drivers/usb/dwc3/core.c
@@ -1594,9 +1594,11 @@ static int dwc3_probe(struct platform_device *pdev)
 
        dwc3_get_properties(dwc);
 
-       ret = dma_set_mask_and_coherent(dwc->sysdev, DMA_BIT_MASK(64));
-       if (ret)
-               return ret;
+       if (!dwc->sysdev_is_parent) {
+               ret = dma_set_mask_and_coherent(dwc->sysdev, DMA_BIT_MASK(64));
+               if (ret)
+                       return ret;
+       }
 
        dwc->reset = devm_reset_control_array_get_optional_shared(dev);
        if (IS_ERR(dwc->reset))