linux-kernel - [PATCH] drivers/usb/dwc3: fix PCI parent check

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Message-Id: <20251105145801.485371-1-punit.agrawal@oss.qualcomm.com>
Date: Wed,  5 Nov 2025 14:58:01 +0000
From: Punit Agrawal <punit.agrawal@....qualcomm.com>
To: Thinh.Nguyen@...opsys.com, gregkh@...uxfoundation.org
Cc: fabioaiuto83@...il.com, linux-usb@...r.kernel.org,
        linux-kernel@...r.kernel.org, Jamie Iles <jamie.iles@....qualcomm.com>,
        Punit Agrawal <punit.agrawal@....qualcomm.com>
Subject: [PATCH] drivers/usb/dwc3: fix PCI parent check

From: Jamie Iles <jamie.iles@....qualcomm.com>

The sysdev_is_parent check was being used to infer PCI devices that have
the DMA mask set from the PCI capabilities, but sysdev_is_parent is also
used for non-PCI ACPI devices in which case the DMA mask would be the
bus default or as set by the _DMA method.

Without this fix the DMA mask would default to 32-bits and so allocation
would fail if there was no DRAM below 4GB.

Fixes: 47ce45906ca9 ("usb: dwc3: leave default DMA for PCI devices")
Signed-off-by: Jamie Iles <jamie.iles@....qualcomm.com>
Signed-off-by: Punit Agrawal <punit.agrawal@....qualcomm.com>
---
 drivers/usb/dwc3/core.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c
index ae140c356295..c2ce2f5e60a1 100644
--- a/drivers/usb/dwc3/core.c
+++ b/drivers/usb/dwc3/core.c
@@ -25,6 +25,7 @@
 #include <linux/of.h>
 #include <linux/of_graph.h>
 #include <linux/acpi.h>
+#include <linux/pci.h>
 #include <linux/pinctrl/consumer.h>
 #include <linux/pinctrl/devinfo.h>
 #include <linux/reset.h>
@@ -2241,7 +2242,7 @@ int dwc3_core_probe(const struct dwc3_probe_data *data)
 	dev_set_drvdata(dev, dwc);
 	dwc3_cache_hwparams(dwc);
 
-	if (!dwc->sysdev_is_parent &&
+	if (!dev_is_pci(dwc->sysdev) &&
 	    DWC3_GHWPARAMS0_AWIDTH(dwc->hwparams.hwparams0) == 64) {
 		ret = dma_set_mask_and_coherent(dwc->sysdev, DMA_BIT_MASK(64));
 		if (ret)
-- 
2.34.1