linux-kernel - [PATCH 06/23] usb: mtu3: power down port when power down device IP

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Date:   Tue, 8 Jun 2021 15:57:32 +0800
From:   Chunfeng Yun <chunfeng.yun@...iatek.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Rob Herring <robh+dt@...nel.org>,
        Felipe Balbi <balbi@...nel.org>
CC:     Chunfeng Yun <chunfeng.yun@...iatek.com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Thinh Nguyen <Thinh.Nguyen@...opsys.com>,
        <linux-usb@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-mediatek@...ts.infradead.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, Yuwen Ng <yuwen.ng@...iatek.com>,
        Eddie Hung <eddie.hung@...iatek.com>
Subject: [PATCH 06/23] usb: mtu3: power down port when power down device IP

When power down device IP, we can also power down device port,
then power on the port again when power on device ip, it's helpful
to make device ip enter ip sleep mode.

Signed-off-by: Chunfeng Yun <chunfeng.yun@...iatek.com>
---
 drivers/usb/mtu3/mtu3_core.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/drivers/usb/mtu3/mtu3_core.c b/drivers/usb/mtu3/mtu3_core.c
index e306b93c007d..562f4357831e 100644
--- a/drivers/usb/mtu3/mtu3_core.c
+++ b/drivers/usb/mtu3/mtu3_core.c
@@ -334,6 +334,10 @@ void mtu3_start(struct mtu3 *mtu)
 		mtu3_readl(mbase, U3D_DEVICE_CONTROL));
 
 	mtu3_clrbits(mtu->ippc_base, U3D_SSUSB_IP_PW_CTRL2, SSUSB_IP_DEV_PDN);
+	if (mtu->is_u3_ip)
+		mtu3_clrbits(mtu->ippc_base, SSUSB_U3_CTRL(0), SSUSB_U3_PORT_PDN);
+
+	mtu3_clrbits(mtu->ippc_base, SSUSB_U2_CTRL(0), SSUSB_U2_PORT_PDN);
 
 	mtu3_csr_init(mtu);
 	mtu3_set_speed(mtu, mtu->speed);
@@ -356,6 +360,11 @@ void mtu3_stop(struct mtu3 *mtu)
 		mtu3_dev_on_off(mtu, 0);
 
 	mtu->is_active = 0;
+
+	if (mtu->is_u3_ip)
+		mtu3_setbits(mtu->ippc_base, SSUSB_U3_CTRL(0), SSUSB_U3_PORT_PDN);
+
+	mtu3_setbits(mtu->ippc_base, SSUSB_U2_CTRL(0), SSUSB_U2_PORT_PDN);
 	mtu3_setbits(mtu->ippc_base, U3D_SSUSB_IP_PW_CTRL2, SSUSB_IP_DEV_PDN);
 }
 
-- 
2.18.0