linux-kernel - [PATCH 20/23] usb: mtu3: add helper to power on/down device

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Date:   Tue, 8 Jun 2021 15:57:46 +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 20/23] usb: mtu3: add helper to power on/down device

Add helper to power on/down device ports and ip, it will be
used when support device suspend/resume

Signed-off-by: Chunfeng Yun <chunfeng.yun@...iatek.com>
---
 drivers/usb/mtu3/mtu3_core.c | 36 ++++++++++++++++++++++++------------
 1 file changed, 24 insertions(+), 12 deletions(-)

diff --git a/drivers/usb/mtu3/mtu3_core.c b/drivers/usb/mtu3/mtu3_core.c
index 6d23acb4fffc..648e970d77ba 100644
--- a/drivers/usb/mtu3/mtu3_core.c
+++ b/drivers/usb/mtu3/mtu3_core.c
@@ -141,6 +141,28 @@ static void mtu3_device_disable(struct mtu3 *mtu)
 	mtu3_setbits(ibase, U3D_SSUSB_IP_PW_CTRL2, SSUSB_IP_DEV_PDN);
 }
 
+static void mtu3_dev_power_on(struct mtu3 *mtu)
+{
+	void __iomem *ibase = mtu->ippc_base;
+
+	mtu3_clrbits(ibase, U3D_SSUSB_IP_PW_CTRL2, SSUSB_IP_DEV_PDN);
+	if (mtu->is_u3_ip)
+		mtu3_clrbits(ibase, SSUSB_U3_CTRL(0), SSUSB_U3_PORT_PDN);
+
+	mtu3_clrbits(ibase, SSUSB_U2_CTRL(0), SSUSB_U2_PORT_PDN);
+}
+
+static void mtu3_dev_power_down(struct mtu3 *mtu)
+{
+	void __iomem *ibase = mtu->ippc_base;
+
+	if (mtu->is_u3_ip)
+		mtu3_setbits(ibase, SSUSB_U3_CTRL(0), SSUSB_U3_PORT_PDN);
+
+	mtu3_setbits(ibase, SSUSB_U2_CTRL(0), SSUSB_U2_PORT_PDN);
+	mtu3_setbits(ibase, U3D_SSUSB_IP_PW_CTRL2, SSUSB_IP_DEV_PDN);
+}
+
 /* reset U3D's device module. */
 static void mtu3_device_reset(struct mtu3 *mtu)
 {
@@ -333,12 +355,7 @@ void mtu3_start(struct mtu3 *mtu)
 	dev_dbg(mtu->dev, "%s devctl 0x%x\n", __func__,
 		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_dev_power_on(mtu);
 	mtu3_csr_init(mtu);
 	mtu3_set_speed(mtu, mtu->speed);
 
@@ -360,12 +377,7 @@ 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);
+	mtu3_dev_power_down(mtu);
 }
 
 /* for non-ep0 */
-- 
2.18.0