linux-kernel - [PATCH] phy: rockchip-inno-usb2: Ignore OTG IRQs in host mode

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Message-Id: <20220708061434.38115-1-samuel@sholland.org>
Date:   Fri,  8 Jul 2022 01:14:34 -0500
From:   Samuel Holland <samuel@...lland.org>
To:     Frank Wunderlich <frank-w@...lic-files.de>,
        Vinod Koul <vkoul@...nel.org>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Peter Geis <pgwipeout@...il.com>,
        Samuel Holland <samuel@...lland.org>,
        Heiko Stuebner <heiko@...ech.de>,
        Kishon Vijay Abraham I <kishon@...com>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-phy@...ts.infradead.org, linux-rockchip@...ts.infradead.org
Subject: [PATCH] phy: rockchip-inno-usb2: Ignore OTG IRQs in host mode

When the OTG port is fixed to host mode, the driver does not request its
IRQs, nor does it enable those IRQs in hardware. Similarly, the driver
should ignore the OTG port IRQs when handling the shared interrupt.

Otherwise, it would update the extcon based on an ID pin which may be in
an undefined state, or try to queue a uninitialized work item.

Fixes: 6a98df08ccd5 ("phy: rockchip-inno-usb2: Fix muxed interrupt support")
Reported-by: Frank Wunderlich <frank-w@...lic-files.de>
Signed-off-by: Samuel Holland <samuel@...lland.org>
---

 drivers/phy/rockchip/phy-rockchip-inno-usb2.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/phy/rockchip/phy-rockchip-inno-usb2.c b/drivers/phy/rockchip/phy-rockchip-inno-usb2.c
index 6711659f727c..26b841c49ec6 100644
--- a/drivers/phy/rockchip/phy-rockchip-inno-usb2.c
+++ b/drivers/phy/rockchip/phy-rockchip-inno-usb2.c
@@ -978,7 +978,9 @@ static irqreturn_t rockchip_usb2phy_irq(int irq, void *data)
 
 		switch (rport->port_id) {
 		case USB2PHY_PORT_OTG:
-			ret |= rockchip_usb2phy_otg_mux_irq(irq, rport);
+			if (rport->mode != USB_DR_MODE_HOST &&
+			    rport->mode != USB_DR_MODE_UNKNOWN)
+				ret |= rockchip_usb2phy_otg_mux_irq(irq, rport);
 			break;
 		case USB2PHY_PORT_HOST:
 			ret |= rockchip_usb2phy_linestate_irq(irq, rport);
-- 
2.35.1