diff mbox series

[5.15,009/179] usb: dwc3: leave default DMA for PCI devices

Message ID 20211129181719.246660831@linuxfoundation.org
State New
Headers show
Series None | expand

Commit Message

Greg KH Nov. 29, 2021, 6:16 p.m. UTC 
From: Fabio Aiuto <fabioaiuto83@gmail.com>

commit 47ce45906ca9870cf5267261f155fb7c70307cf0 upstream.

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>
---
 drivers/usb/dwc3/core.c |    8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)
diff mbox series

Patch

--- a/drivers/usb/dwc3/core.c
+++ b/drivers/usb/dwc3/core.c
@@ -1565,9 +1565,11 @@  static int dwc3_probe(struct platform_de
 
 	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))