[PATCH v5 3/5] usb: dwc3-generic: Relax unsupported dr_mode check

[Jonas Karlman]

When dr_mode is peripheral or otg and U-Boot has not been built with
DM_USB_GADGET support, booting such device may end up with:

  dwc3_glue_bind_common: subnode name: usb at fcc00000
  Error binding driver 'dwc3-generic-wrapper': -6
  Some drivers failed to bind
  initcall sequence 00000000effbca08 failed at call 0000000000a217c8 (err=-6)
  ### ERROR ### Please RESET the board ###

Instead fail gracfully with ENODEV to allow board continue booting.

  dwc3_glue_bind_common: subnode name: usb at fcc00000
  dwc3_glue_bind_common: unsupported dr_mode 3

Also use CONFIG_IS_ENABLED(USB_HOST) and change switch to if statements
to improve readability of the code.

Fixes: 446e3a205b87 ("dwc3-generic: Handle the PHYs, the clocks and the reset lines")
Signed-off-by: Jonas Karlman <jonas at kwiboo.se>
Reviewed-by: Marek Vasut <marex at denx.de>
---
v5:
- Collect r-b tag
v4:
- Add fixes tag
v3:
- Update debug message to include dr_mode (Marek Vasut)
v2:
- Change to use CONFIG_IS_ENABLED for USB_HOST
- Refactor switch to if statements (Marek Vasut)

 drivers/usb/dwc3/dwc3-generic.c | 27 ++++++++-------------------
 1 file changed, 8 insertions(+), 19 deletions(-)

diff --git a/drivers/usb/dwc3/dwc3-generic.c b/drivers/usb/dwc3/dwc3-generic.c
index 4d5d500aefab..2331ac453132 100644
--- a/drivers/usb/dwc3/dwc3-generic.c
+++ b/drivers/usb/dwc3/dwc3-generic.c
@@ -226,8 +226,7 @@ U_BOOT_DRIVER(dwc3_generic_peripheral) = {
 };
 #endif
 
-#if defined(CONFIG_SPL_USB_HOST) || \
-	!defined(CONFIG_SPL_BUILD) && defined(CONFIG_USB_HOST)
+#if CONFIG_IS_ENABLED(USB_HOST)
 static int dwc3_generic_host_probe(struct udevice *dev)
 {
 	struct xhci_hcor *hcor;
@@ -409,7 +408,7 @@ struct dwc3_glue_ops ti_ops = {
 static int dwc3_glue_bind_common(struct udevice *parent, ofnode node)
 {
 	const char *name = ofnode_get_name(node);
-	const char *driver = NULL;
+	const char *driver;
 	enum usb_dr_mode dr_mode;
 	struct udevice *dev;
 	int ret;
@@ -421,27 +420,17 @@ static int dwc3_glue_bind_common(struct udevice *parent, ofnode node)
 	if (!dr_mode)
 		dr_mode = usb_get_dr_mode(node);
 
-	switch (dr_mode) {
-	case USB_DR_MODE_PERIPHERAL:
-	case USB_DR_MODE_OTG:
-#if CONFIG_IS_ENABLED(DM_USB_GADGET)
+	if (CONFIG_IS_ENABLED(DM_USB_GADGET) &&
+	    (dr_mode == USB_DR_MODE_PERIPHERAL || dr_mode == USB_DR_MODE_OTG)) {
 		debug("%s: dr_mode: OTG or Peripheral\n", __func__);
 		driver = "dwc3-generic-peripheral";
-#endif
-		break;
-#if defined(CONFIG_SPL_USB_HOST) || !defined(CONFIG_SPL_BUILD)
-	case USB_DR_MODE_HOST:
+	} else if (CONFIG_IS_ENABLED(USB_HOST) && dr_mode == USB_DR_MODE_HOST) {
 		debug("%s: dr_mode: HOST\n", __func__);
 		driver = "dwc3-generic-host";
-		break;
-#endif
-	default:
-		debug("%s: unsupported dr_mode\n", __func__);
+	} else {
+		debug("%s: unsupported dr_mode %d\n", __func__, dr_mode);
 		return -ENODEV;
-	};
-
-	if (!driver)
-		return -ENXIO;
+	}
 
 	ret = device_bind_driver_to_node(parent, driver, name,
 					 node, &dev);
-- 
2.41.0