[PATCH] usb: dwc3: Use the correct PHY mode for USB3 PHY
From: Prashanth K
Date: Mon Oct 12 2026 - 05:42:54 EST
DWC3 currently configures USB3 PHYs with PHY_MODE_USB_HOST when
switching the controller to host mode. Even though usb_add_hcd()
sets the flag corrrectly, it gets overwritten in DWC3 layer.
Some PHY drivers distinguish between USB2 and SS host modes and
expect USB3 PHYs to be configured with PHY_MODE_USB_HOST_SS. Using
PHY_MODE_USB_HOST may result in incorrect PHY programming. Fix this
by using PHY_MODE_USB_HOST_SS for USB3 PHYs.
Signed-off-by: Prashanth K <prashanth.k@xxxxxxxxxxxxxxxx>
---
drivers/usb/dwc3/core.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c
index fd5c2cd36c59..1bb87a370725 100644
--- a/drivers/usb/dwc3/core.c
+++ b/drivers/usb/dwc3/core.c
@@ -251,7 +251,7 @@ static void __dwc3_set_mode(struct work_struct *work)
for (i = 0; i < dwc->num_usb2_ports; i++)
phy_set_mode(dwc->usb2_generic_phy[i], PHY_MODE_USB_HOST);
for (i = 0; i < dwc->num_usb3_ports; i++)
- phy_set_mode(dwc->usb3_generic_phy[i], PHY_MODE_USB_HOST);
+ phy_set_mode(dwc->usb3_generic_phy[i], PHY_MODE_USB_HOST_SS);
if (dwc->dis_split_quirk) {
reg = dwc3_readl(dwc, DWC3_GUCTL3);
@@ -1643,7 +1643,7 @@ static int dwc3_core_init_mode(struct dwc3 *dwc)
for (i = 0; i < dwc->num_usb2_ports; i++)
phy_set_mode(dwc->usb2_generic_phy[i], PHY_MODE_USB_HOST);
for (i = 0; i < dwc->num_usb3_ports; i++)
- phy_set_mode(dwc->usb3_generic_phy[i], PHY_MODE_USB_HOST);
+ phy_set_mode(dwc->usb3_generic_phy[i], PHY_MODE_USB_HOST_SS);
ret = dwc3_host_init(dwc);
if (ret)
--
2.34.1