linux-kernel - [PATCH 4.9 094/222] usb: chipidea: imx: enable OTG overcurrent in case USB subsystem is already started

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Message-Id: <20191122100910.260315838@linuxfoundation.org>
Date:   Fri, 22 Nov 2019 11:27:14 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Nicolas Adell <nicolas.adell@...ia.fr>,
        Peter Chen <peter.chen@....com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 4.9 094/222] usb: chipidea: imx: enable OTG overcurrent in case USB subsystem is already started

From: Nicolas Adell <nicolas.adell@...ia.fr>

[ Upstream commit 1dedbdf2bbb1ede8d96f35f9845ecae179dc1988 ]

When initializing the USB subsystem before starting the kernel,
OTG overcurrent detection is disabled. In case the OTG polarity of
overcurrent is low active, the overcurrent detection is never enabled
again and events cannot be reported as expected. Because imx usb
overcurrent polarity is low active by default, only detection needs
to be enable in usbmisc init function.

Signed-off-by: Nicolas Adell <nicolas.adell@...ia.fr>
Signed-off-by: Peter Chen <peter.chen@....com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/usb/chipidea/usbmisc_imx.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/usb/chipidea/usbmisc_imx.c b/drivers/usb/chipidea/usbmisc_imx.c
index 20d02a5e418d9..c6577f489d0f6 100644
--- a/drivers/usb/chipidea/usbmisc_imx.c
+++ b/drivers/usb/chipidea/usbmisc_imx.c
@@ -273,6 +273,8 @@ static int usbmisc_imx6q_init(struct imx_usbmisc_data *data)
 	} else if (data->oc_polarity == 1) {
 		/* High active */
 		reg &= ~(MX6_BM_OVER_CUR_DIS | MX6_BM_OVER_CUR_POLARITY);
+	} else {
+		reg &= ~(MX6_BM_OVER_CUR_DIS);
 	}
 	writel(reg, usbmisc->base + data->index * 4);
 
-- 
2.20.1