linux-kernel - [PATCH v2 7/7] usb: mtu3: fix uncontinuous SeqN issue after disable EP

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Message-ID: <5d0d535b9a86a07d9b1bddfbca62b54e7d96a702.1525930818.git.chunfeng.yun@mediatek.com>
Date:   Thu, 10 May 2018 13:47:12 +0800
From:   Chunfeng Yun <chunfeng.yun@...iatek.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Felipe Balbi <felipe.balbi@...ux.intel.com>
CC:     Matthias Brugger <matthias.bgg@...il.com>,
        Chunfeng Yun <chunfeng.yun@...iatek.com>,
        <linux-usb@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-mediatek@...ts.infradead.org>
Subject: [PATCH v2 7/7] usb: mtu3: fix uncontinuous SeqN issue after disable EP

Reset EP when disable it to reset data toggle for U2 EP, and
SeqN, flow control status etc for U3 EP, this can avoid
issue of uncontinuous SeqN

Signed-off-by: Chunfeng Yun <chunfeng.yun@...iatek.com>
---
v2:
    add this patch
---
 drivers/usb/mtu3/mtu3_core.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/usb/mtu3/mtu3_core.c b/drivers/usb/mtu3/mtu3_core.c
index 65ff53a..0bc2b39 100644
--- a/drivers/usb/mtu3/mtu3_core.c
+++ b/drivers/usb/mtu3/mtu3_core.c
@@ -400,6 +400,10 @@ void mtu3_deconfig_ep(struct mtu3 *mtu, struct mtu3_ep *mep)
 		mtu3_setbits(mbase, U3D_QIECR0, QMU_RX_DONE_INT(epnum));
 	}
 
+	/* reset: u2 - data toggle, u3 - SeqN, flow control status etc */
+	mtu3_setbits(mbase, U3D_EP_RST, EP_RST(mep->is_in, epnum));
+	mtu3_clrbits(mbase, U3D_EP_RST, EP_RST(mep->is_in, epnum));
+
 	ep_fifo_free(mep);
 
 	dev_dbg(mtu->dev, "%s: %s\n", __func__, mep->name);
-- 
1.9.1