Problem: The first "run fastboot" works and enumerates on the host. Subsequent runs fail, with no USB enumeration observed.
With flat DTS configurations, the peripheral device inherits power-domains from its parent (glue) node, as both reference the same DT node. During teardown after "fastboot continue", device_remove() of peripheral device invokes dev_power_domain_off(), which powers off the shared USB GDSC. As a result, the next "run fastboot" fails because the power domain is left in an uninitialized state. Add DM_FLAG_LEAVE_PD_ON to dwc3_generic_peripheral to prevent power domain shutdown during peripheral removal. This aligns with hierarchical DTS behavior, where the peripheral child does not own power-domains. Power management remains with the glue device, which persists across probe/remove cycles, allowing repeated fastboot runs to succeed. Signed-off-by: Balaji Selvanathan <[email protected]> --- drivers/usb/dwc3/dwc3-generic.c | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/usb/dwc3/dwc3-generic.c b/drivers/usb/dwc3/dwc3-generic.c index 22b9ef0b24e..788fe6fc819 100644 --- a/drivers/usb/dwc3/dwc3-generic.c +++ b/drivers/usb/dwc3/dwc3-generic.c @@ -220,6 +220,7 @@ U_BOOT_DRIVER(dwc3_generic_peripheral) = { .remove = dwc3_generic_peripheral_remove, .priv_auto = sizeof(struct dwc3_generic_priv), .plat_auto = sizeof(struct dwc3_generic_plat), + .flags = DM_FLAG_LEAVE_PD_ON, }; #endif --- base-commit: 987907ae4bcc5d6055bdf7d318a3edf53e14d5fa change-id: 20260529-usb-3b6b44559cc5 Best regards, -- Balaji Selvanathan <[email protected]>
