linux-kernel - [PATCH 04/11] usb: mtu3: clear interrupts status when disable interrupts

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Date:   Mon, 27 Jul 2020 15:14:53 +0800
From:   Chunfeng Yun <chunfeng.yun@...iatek.com>
To:     Felipe Balbi <balbi@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
CC:     Matthias Brugger <matthias.bgg@...il.com>,
        Chunfeng Yun <chunfeng.yun@...iatek.com>,
        <linux-usb@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-mediatek@...ts.infradead.org>,
        Eddie Hung <eddie.hung@...iatek.com>
Subject: [PATCH 04/11] usb: mtu3: clear interrupts status when disable interrupts

When disable interrupts, will also want to clear their status,
ensure it by calling mtu3_intr_status_clear() in
mtu3_intr_disable().

Signed-off-by: Chunfeng Yun <chunfeng.yun@...iatek.com>
---
 drivers/usb/mtu3/mtu3_core.c | 25 ++++++++++++-------------
 1 file changed, 12 insertions(+), 13 deletions(-)

diff --git a/drivers/usb/mtu3/mtu3_core.c b/drivers/usb/mtu3/mtu3_core.c
index f3ad1cc..ece5b3e 100644
--- a/drivers/usb/mtu3/mtu3_core.c
+++ b/drivers/usb/mtu3/mtu3_core.c
@@ -147,17 +147,6 @@ static void mtu3_device_reset(struct mtu3 *mtu)
 	mtu3_clrbits(ibase, U3D_SSUSB_DEV_RST_CTRL, SSUSB_DEV_SW_RST);
 }
 
-/* disable all interrupts */
-static void mtu3_intr_disable(struct mtu3 *mtu)
-{
-	void __iomem *mbase = mtu->mac_base;
-
-	/* Disable level 1 interrupts */
-	mtu3_writel(mbase, U3D_LV1IECR, ~0x0);
-	/* Disable endpoint interrupts */
-	mtu3_writel(mbase, U3D_EPIECR, ~0x0);
-}
-
 static void mtu3_intr_status_clear(struct mtu3 *mtu)
 {
 	void __iomem *mbase = mtu->mac_base;
@@ -170,6 +159,18 @@ static void mtu3_intr_status_clear(struct mtu3 *mtu)
 	mtu3_writel(mbase, U3D_LTSSM_INTR, ~0x0);
 	/* Clear speed change interrupt status */
 	mtu3_writel(mbase, U3D_DEV_LINK_INTR, ~0x0);
+	/* Clear QMU interrupt status */
+	mtu3_writel(mbase, U3D_QISAR0, ~0x0);
+}
+
+/* disable all interrupts */
+static void mtu3_intr_disable(struct mtu3 *mtu)
+{
+	/* Disable level 1 interrupts */
+	mtu3_writel(mtu->mac_base, U3D_LV1IECR, ~0x0);
+	/* Disable endpoint interrupts */
+	mtu3_writel(mtu->mac_base, U3D_EPIECR, ~0x0);
+	mtu3_intr_status_clear(mtu);
 }
 
 /* enable system global interrupt */
@@ -312,7 +313,6 @@ void mtu3_stop(struct mtu3 *mtu)
 	dev_dbg(mtu->dev, "%s\n", __func__);
 
 	mtu3_intr_disable(mtu);
-	mtu3_intr_status_clear(mtu);
 
 	if (mtu->softconnect)
 		mtu3_dev_on_off(mtu, 0);
@@ -600,7 +600,6 @@ static void mtu3_regs_init(struct mtu3 *mtu)
 
 	/* be sure interrupts are disabled before registration of ISR */
 	mtu3_intr_disable(mtu);
-	mtu3_intr_status_clear(mtu);
 
 	mtu3_csr_init(mtu);
 
-- 
1.9.1