[PATCH] usb: dwc3: Resend full Data Packet for non-compliant USB3.1 devices
From: Konrad Dybcio <konradybcio@kernel.org>
Date: 2026-09-15 19:03:49
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Subsystem:
designware usb3 drd ip driver, the rest, usb subsystem · Maintainers:
Thinh Nguyen, Linus Torvalds, Greg Kroah-Hartman
From: Konrad Dybcio <redacted> Some non-compliant devices require that a full Data Packet (and not only the header) is resent upon LBAD. One such device is the USB3 protocol adapter within the Qualcomm USB4 router. DWC3 has a toggle to enable that behavior within LLINKDBGCTRL, use it. Signed-off-by: Konrad Dybcio <redacted> --- drivers/usb/dwc3/core.c | 8 ++++++++ drivers/usb/dwc3/core.h | 2 ++ 2 files changed, 10 insertions(+)
diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c
index fd5c2cd36c59..d375ebee297b 100644
--- a/drivers/usb/dwc3/core.c
+++ b/drivers/usb/dwc3/core.c@@ -1514,6 +1514,14 @@ int dwc3_core_init(struct dwc3 *dwc) } } + if (DWC3_IP_IS(DWC31) || DWC3_IP_IS(DWC32)) { + for (int i = 0; i < dwc->num_usb3_ports; i++) { + reg = dwc3_readl(dwc, DWC3_LLINKDBGCTRL(i)); + reg |= DWC3_LLINKDBGCTRL_RETRY_DP; + dwc3_writel(dwc, DWC3_LLINKDBGCTRL(i), reg); + } + } + /* * STAR 9001346572: This issue affects DWC_usb31 versions 1.80a and * prior. When an active endpoint not currently cached in the host
diff --git a/drivers/usb/dwc3/core.h b/drivers/usb/dwc3/core.h
index 608daeb7ef10..6af644a9672d 100644
--- a/drivers/usb/dwc3/core.h
+++ b/drivers/usb/dwc3/core.h@@ -180,6 +180,8 @@ #define DWC3_OSTS 0xcc10 #define DWC3_LLUCTL(n) (0xd024 + ((n) * 0x80)) +#define DWC3_LLINKDBGCTRL(n) (0xd058 + ((n) * 0x80)) +#define DWC3_LLINKDBGCTRL_RETRY_DP BIT(31) /* Bit fields */
--- base-commit: 1a1de54f7369cd2b5bac0f265910e60ad3a6b4c3 change-id: 20260915-topic-usb3_tunneling_fixup-8c0fb73edec8 Best regards, -- Konrad Dybcio [off-list ref]