linux-kernel - [PATCH 5.15 009/179] usb: dwc3: leave default DMA for PCI devices

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Message-Id: <20211129181719.246660831@linuxfoundation.org>
Date:   Mon, 29 Nov 2021 19:16:43 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Hans De Goede <hdegoede@...hat.com>,
        Fabio Aiuto <fabioaiuto83@...il.com>
Subject: [PATCH 5.15 009/179] usb: dwc3: leave default DMA for PCI devices

From: Fabio Aiuto <fabioaiuto83@...il.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@...r.kernel.org>
Reported-by: Hans De Goede <hdegoede@...hat.com>
Tested-by: Fabio Aiuto <fabioaiuto83@...il.com>
Tested-by: Hans de Goede <hdegoede@...hat.com>
Signed-off-by: Fabio Aiuto <fabioaiuto83@...il.com>
Link: https://lore.kernel.org/r/20211113142959.27191-1-fabioaiuto83@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/usb/dwc3/core.c |    8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

--- 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))