FAILED: patch "[PATCH] phy: sun4i-usb: Support set_mode to USB_HOST for non-OTG PHYs" failed to apply to 4.9-stable tree

The patch below does not apply to the 4.9-stable tree.
If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to <[email protected]>.

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From 1396929e8a903db80425343cacca766a18ad6409 Mon Sep 17 00:00:00 2001
From: Chen-Yu Tsai <[email protected]>
Date: Fri, 22 Mar 2019 16:51:07 +0800
Subject: [PATCH] phy: sun4i-usb: Support set_mode to USB_HOST for non-OTG PHYs

While only the first PHY supports mode switching, the remaining PHYs work in USB host mode. They should support set_mode with mode=USB_HOST instead of failing. This is especially needed now that the USB core does set_mode for all USB ports, which was added in commit b97a31348379 ("usb:
core: comply to PHY framework").

Make set_mode with mode=USB_HOST a no-op instead of failing for the non-OTG USB PHYs.

index 5163097b43df..4bbd9ede38c8 100644
@@ -485,8 +485,11 @@ static int sun4i_usb_phy_set_mode(struct phy *_phy,
 	struct sun4i_usb_phy_data *data = to_sun4i_usb_phy_data(phy);
 	int new_mode;
 
-	if (phy->index != 0)
+	if (phy->index != 0) {
+		if (mode == PHY_MODE_USB_HOST)
+			return 0;
 		return -EINVAL;
+	}
 
 	switch (mode) {
 	case PHY_MODE_USB_HOST: