phy: sun4i-usb: Support set_mode to USB_HOST for non-OTG PHYs

BugLink: https://bugs.launchpad.net/bugs/1838116
commit 1396929e8a903db80425343cacca766a18ad6409 upstream.

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.

Fixes: 6ba43c291961 ("phy-sun4i-usb: Add support for phy_set_mode")
Signed-off-by: Chen-Yu Tsai <wens@csie.org>
Cc: stable <stable@vger.kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Kamal Mostafa <kamal@canonical.com>
Signed-off-by: Khalid Elmously <khalid.elmously@canonical.com>

diff --git a/drivers/phy/allwinner/phy-sun4i-usb.c b/drivers/phy/allwinner/phy-sun4i-usb.c
index e49fd0de34b1e62a6fd009ac49133149ac974884..e5e4827e71f3962fde30927229619098a7328a33 100644 (file)
--- a/drivers/phy/allwinner/phy-sun4i-usb.c
+++ b/drivers/phy/allwinner/phy-sun4i-usb.c
@@ -480,8 +480,11 @@ static int sun4i_usb_phy_set_mode(struct phy *_phy, enum phy_mode mode)
        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: