usb: dwc3: gadget: Fix match_ep callback for NXP UUU tool
The UUU tool excepts the interrupt-in endpoint to be ep1in, otherwise
it crashes. This is a result of the previous hard-coded EP setup in
drivers/usb/gadget/epautoconf.c which did special-case EP allocation
for SPL builds, and which was since converted to this callback, but
without the special-case EP allocation in SPL part.
This reinstates the SPL part in an isolated manner, only for NXP iMX
SoCs, only for SPL builds, and only for the ep1in interrupt-in endpoint.
Fixes: 1918b8010c32 ("usb: dwc3: gadget: Convert epautoconf workaround to match_ep callback")
Signed-off-by: Marek Vasut <marex@denx.de>
Reviewed-by: Mattijs Korpershoek <mkorpershoek@baylibre.com>
Link: https://lore.kernel.org/r/20250319220805.219001-1-marex@denx.de
Signed-off-by: Mattijs Korpershoek <mkorpershoek@baylibre.com>
diff --git a/drivers/usb/dwc3/gadget.c b/drivers/usb/dwc3/gadget.c
index e5a3834..477ecd0 100644
--- a/drivers/usb/dwc3/gadget.c
+++ b/drivers/usb/dwc3/gadget.c
@@ -1631,8 +1631,25 @@
return dwc3_find_ep(gadget, "ep1in");
if (usb_endpoint_is_bulk_out(desc))
return dwc3_find_ep(gadget, "ep2out");
- if (usb_endpoint_is_int_in(desc))
+ if (usb_endpoint_is_int_in(desc)) {
+ /*
+ * Special workaround for NXP UUU tool in SPL.
+ *
+ * The tool excepts the interrupt-in endpoint to be ep1in,
+ * otherwise it crashes. This is a result of the previous
+ * hard-coded EP setup in drivers/usb/gadget/epautoconf.c
+ * which did special-case EP allocation for SPL builds,
+ * and which was since converted to this callback, but
+ * without the special-case EP allocation in SPL part.
+ *
+ * This reinstates the SPL part in an isolated manner,
+ * only for NXP iMX SoCs, only for SPL builds, and only
+ * for the ep1in interrupt-in endpoint.
+ */
+ if (IS_ENABLED(CONFIG_MACH_IMX) && IS_ENABLED(CONFIG_XPL_BUILD))
+ return dwc3_find_ep(gadget, "ep1in");
return dwc3_find_ep(gadget, "ep3in");
+ }
return NULL;
}