From: Konrad Dybcio <konrad.dybcio@oss.qualcomm.com>
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 <konrad.dybcio@oss.qualcomm.com>
---
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 <konrad.dybcio@oss.qualcomm.com>