The dwc3 instances on Qualcomm IPQ4019 mishandle xHCI 1.0 Soft Retry. A
Stop Endpoint command landing on a just-soft-retry-reset endpoint wedges
the command ring, and the stop-endpoint watchdog kills the host five
seconds later. Reproducible by unplugging a USB-tethered phone
mid-transfer; the port stays dead until the platform device is rebound.
XHCI_NO_SOFT_RETRY already exists for this class of defect but is only
reachable from xhci-pci, matched against two AMD Promontory PCI ids.
Patch 1 adds a device property so platform hosts can request it. Patch 2
carries it through the dwc3 core as a software property. Patch 3 sets it
from the qcom glue on the SoC compatible.
The match entry in patch 3 has no effect until the ipq4019 devicetree
moves to the qcom,snps-dwc3 glue, sent separately:
https://lore.kernel.org/r/20260829-ipq4019-dwc3-migration-v1-0-cc66b54ce21c@divinehawk.com
This series applies and builds independently of that.
Tested on a Ubiquiti UniFi Travel Router.
Signed-off-by: Matt Eaton <linux@divinehawk.com>
---
Changes in v2:
- Drop the dt-bindings patch; Krzysztof pointed out this is implied by
compatible and shouldn't be a devicetree property.
- Set the quirk from the dwc3 core instead, via a new dwc3_properties
field carried as match data in the qcom glue, per Thinh's review.
- Link to v1: https://lore.kernel.org/r/20260828-xhci-no-soft-retry-v1-0-b9c264b56601@divinehawk.com
---
Matt Eaton (3):
usb: xhci-plat: add xhci-no-soft-retry-quirk device property
usb: dwc3: add xhci_no_soft_retry software property
usb: dwc3: qcom: set xhci_no_soft_retry for IPQ4019
drivers/usb/dwc3/core.c | 3 +++
drivers/usb/dwc3/core.h | 3 +++
drivers/usb/dwc3/dwc3-qcom.c | 17 ++++++++++++++++-
drivers/usb/dwc3/glue.h | 3 +++
drivers/usb/dwc3/host.c | 5 ++++-
drivers/usb/host/xhci-plat.c | 3 +++
6 files changed, 32 insertions(+), 2 deletions(-)
---
base-commit: 45c13f3f9e3bb15fd89ff2864c6f627a3b4b4229
change-id: 20260828-xhci-no-soft-retry-4af6c93dc7d2
Best regards,
--
Matt Eaton <linux@divinehawk.com>