diff mbox series

[RFC,2/3] phy: override dr_mode for phy0

Message ID 20250118102207.9339-2-simons.philippe@gmail.com
State New
Headers show
Series [RFC,1/3] phy: don't let controllers change vbus reg | expand

Commit Message

Philippe Simons Jan. 18, 2025, 10:22 a.m. UTC 
PHY0 mode is fully determined by the selected mux route.
Ignore changes requests from controllers.

Signed-off-by: Philippe Simons <simons.philippe@gmail.com>
---
 drivers/phy/allwinner/phy-sun4i-usb.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)
diff mbox series

Patch

diff --git a/drivers/phy/allwinner/phy-sun4i-usb.c b/drivers/phy/allwinner/phy-sun4i-usb.c
index 24fbabe7a..f163b355e 100644
--- a/drivers/phy/allwinner/phy-sun4i-usb.c
+++ b/drivers/phy/allwinner/phy-sun4i-usb.c
@@ -544,6 +544,18 @@  static int sun4i_usb_phy_set_mode(struct phy *_phy,
 		return -EINVAL;
 	}
 
+	if (data->cfg->phy0_dual_route) {
+		/*
+		 For SoCs with dual route the PHY mode is fully determined by 
+		 the selected mux route (i.e. USB controller to use).
+		 As both host (EHCI/OHCI) and peripheral (MUSB) controllers uses
+		 the same PHY, both drivers can try to set PHY mode.
+		 We need to ignore this requests, but not report error in case
+		 of valid mode values.
+		*/
+		return 0;
+	}
+
 	if (new_mode != data->dr_mode) {
 		dev_info(&_phy->dev, "Changing dr_mode to %d\n", new_mode);
 		data->dr_mode = new_mode;