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From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     linux-kernel@vger.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        stable@vger.kernel.org, Chunfeng Yun <chunfeng.yun@mediatek.com>
Subject: [PATCH 4.18 116/235] usb: mtu3: fix error of xhci port id when enable U3 dual role
Date:   Mon, 24 Sep 2018 13:51:42 +0200
Message-Id: <20180924113117.616351333@linuxfoundation.org>
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4.18-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Chunfeng Yun <chunfeng.yun@mediatek.com>

commit 78af87b8bbbbcaa613f1a7d8f14472fe9a7dc622 upstream.

If dual role mode is enabled, when switch u3port0 to device mode,
it will affect port id calculation of host(xHCI), specially when
host supports multi U2 ports or U3 ports, so need enable its dual
role mode, and fix it here.

Signed-off-by: Chunfeng Yun <chunfeng.yun@mediatek.com>
Cc: stable <stable@vger.kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/usb/mtu3/mtu3_core.c    |    6 +++++-
 drivers/usb/mtu3/mtu3_hw_regs.h |    1 +
 2 files changed, 6 insertions(+), 1 deletion(-)

--- a/drivers/usb/mtu3/mtu3_core.c
+++ b/drivers/usb/mtu3/mtu3_core.c
@@ -107,8 +107,12 @@ static int mtu3_device_enable(struct mtu
 		(SSUSB_U2_PORT_DIS | SSUSB_U2_PORT_PDN |
 		SSUSB_U2_PORT_HOST_SEL));
 
-	if (mtu->ssusb->dr_mode == USB_DR_MODE_OTG)
+	if (mtu->ssusb->dr_mode == USB_DR_MODE_OTG) {
 		mtu3_setbits(ibase, SSUSB_U2_CTRL(0), SSUSB_U2_PORT_OTG_SEL);
+		if (mtu->is_u3_ip)
+			mtu3_setbits(ibase, SSUSB_U3_CTRL(0),
+				     SSUSB_U3_PORT_DUAL_MODE);
+	}
 
 	return ssusb_check_clocks(mtu->ssusb, check_clk);
 }
--- a/drivers/usb/mtu3/mtu3_hw_regs.h
+++ b/drivers/usb/mtu3/mtu3_hw_regs.h
@@ -459,6 +459,7 @@
 
 /* U3D_SSUSB_U3_CTRL_0P */
 #define SSUSB_U3_PORT_SSP_SPEED	BIT(9)
+#define SSUSB_U3_PORT_DUAL_MODE	BIT(7)
 #define SSUSB_U3_PORT_HOST_SEL		BIT(2)
 #define SSUSB_U3_PORT_PDN		BIT(1)
 #define SSUSB_U3_PORT_DIS		BIT(0)