linux-kernel - [PATCH 2/2] usb: core: Try generic PHY_MODE_USB_HOST if usb_phy_roothub_set

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Date:   Fri, 22 Mar 2019 16:51:08 +0800
From:   Chen-Yu Tsai <wens@...nel.org>
To:     Maxime Ripard <maxime.ripard@...tlin.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Kishon Vijay Abraham I <kishon@...com>
Cc:     Chen-Yu Tsai <wens@...e.org>,
        Grygorii Strashko <grygorii.strashko@...com>,
        linux-usb@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH 2/2] usb: core: Try generic PHY_MODE_USB_HOST if usb_phy_roothub_set_mode fails

From: Chen-Yu Tsai <wens@...e.org>

Some PHYs do not support PHY_MODE_USB_HOST_SS, i.e. USB 3.0 or higher.
Fall back and try the more generic PHY_MODE_USB_HOST if it fails.

Fixes: b97a31348379 ("usb: core: comply to PHY framework")
Signed-off-by: Chen-Yu Tsai <wens@...e.org>
---
 drivers/usb/core/hcd.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/usb/core/hcd.c b/drivers/usb/core/hcd.c
index 3189181bb628..975d7c1288e3 100644
--- a/drivers/usb/core/hcd.c
+++ b/drivers/usb/core/hcd.c
@@ -2741,6 +2741,9 @@ int usb_add_hcd(struct usb_hcd *hcd,
 
 		retval = usb_phy_roothub_set_mode(hcd->phy_roothub,
 						  PHY_MODE_USB_HOST_SS);
+		if (retval)
+			retval = usb_phy_roothub_set_mode(hcd->phy_roothub,
+							  PHY_MODE_USB_HOST);
 		if (retval)
 			goto err_usb_phy_roothub_power_on;
 
-- 
2.20.1