patch "usb: dwc3: leave default DMA for PCI devices" added to usb-linus

This is a note to let you know that I've just added the patch titled

usb: dwc3: leave default DMA for PCI devices

to my usb git tree which can be found at
git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git
in the usb-linus branch.

The patch will show up in the next release of the linux-next tree (usually sometime within the next 24 hours during the week.)

The patch will hopefully also be merged in Linus's tree for the next -rc kernel release.

If you have any questions about this process, please let me know.

From 47ce45906ca9870cf5267261f155fb7c70307cf0 Mon Sep 17 00:00:00 2001
From: Fabio Aiuto <[email protected]>
Date: Sat, 13 Nov 2021 15:29:59 +0100
Subject: 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.

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

index 643239d7d370..f4c09951b517 100644
@@ -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))

2.34.0