linux-kernel - [PATCH 5.7 308/376] usb: musb: mediatek: add reset FADDR to zero in reset interrupt handle

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Date:   Fri, 19 Jun 2020 16:33:46 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Macpaul Lin <macpaul.lin@...iatek.com>,
        Min Guo <min.guo@...iatek.com>, Bin Liu <b-liu@...com>
Subject: [PATCH 5.7 308/376] usb: musb: mediatek: add reset FADDR to zero in reset interrupt handle

From: Macpaul Lin <macpaul.lin@...iatek.com>

commit 402bcac4b25b520c89ba60db85eb6316f36e797f upstream.

When receiving reset interrupt, FADDR need to be reset to zero in
peripheral mode. Otherwise ep0 cannot do enumeration when re-plugging USB
cable.

Signed-off-by: Macpaul Lin <macpaul.lin@...iatek.com>
Acked-by: Min Guo <min.guo@...iatek.com>
Signed-off-by: Bin Liu <b-liu@...com>
Link: https://lore.kernel.org/r/20200525025049.3400-5-b-liu@ti.com
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/usb/musb/mediatek.c |    6 ++++++
 1 file changed, 6 insertions(+)

--- a/drivers/usb/musb/mediatek.c
+++ b/drivers/usb/musb/mediatek.c
@@ -208,6 +208,12 @@ static irqreturn_t generic_interrupt(int
 	musb->int_rx = musb_clearw(musb->mregs, MUSB_INTRRX);
 	musb->int_tx = musb_clearw(musb->mregs, MUSB_INTRTX);
 
+	if ((musb->int_usb & MUSB_INTR_RESET) && !is_host_active(musb)) {
+		/* ep0 FADDR must be 0 when (re)entering peripheral mode */
+		musb_ep_select(musb->mregs, 0);
+		musb_writeb(musb->mregs, MUSB_FADDR, 0);
+	}
+
 	if (musb->int_usb || musb->int_tx || musb->int_rx)
 		retval = musb_interrupt(musb);