linux-kernel - [PATCH 1/2] usb: cdns3: fix cdns3_core_init

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Date:   Mon, 7 Oct 2019 15:16:00 +0300
From:   Roger Quadros <rogerq@...com>
To:     <felipe.balbi@...ux.intel.com>, <gregkh@...uxfoundation.org>,
        <pawell@...ence.com>
CC:     <peter.chen@....com>, <nsekhar@...com>, <kurahul@...ence.com>,
        <linux-usb@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        Roger Quadros <rogerq@...com>
Subject: [PATCH 1/2] usb: cdns3: fix cdns3_core_init_role()

At startup we should trigger the HW state machine
only if it is OTG mode. Otherwise we should just
start the respective role.

Initialize idle role by default. If we don't do this then
cdns3_idle_role_stop() is not called when switching to
host/device role and so lane switch mechanism
doesn't work. This results to super-speed device not working
in one orientation if it was plugged before driver probe.

Signed-off-by: Roger Quadros <rogerq@...com>
Signed-off-by: Sekhar Nori <nsekhar@...com>
---
 drivers/usb/cdns3/core.c | 20 +++++++++++++++++++-
 1 file changed, 19 insertions(+), 1 deletion(-)

diff --git a/drivers/usb/cdns3/core.c b/drivers/usb/cdns3/core.c
index 06f1e105be4e..1109dc5a4c39 100644
--- a/drivers/usb/cdns3/core.c
+++ b/drivers/usb/cdns3/core.c
@@ -160,10 +160,28 @@ static int cdns3_core_init_role(struct cdns3 *cdns)
 	if (ret)
 		goto err;
 
-	if (cdns->dr_mode != USB_DR_MODE_OTG) {
+	/* Initialize idle role to start with */
+	ret = cdns3_role_start(cdns, USB_ROLE_NONE);
+	if (ret)
+		goto err;
+
+	switch (cdns->dr_mode) {
+	case USB_DR_MODE_UNKNOWN:
+	case USB_DR_MODE_OTG:
 		ret = cdns3_hw_role_switch(cdns);
 		if (ret)
 			goto err;
+		break;
+	case USB_DR_MODE_PERIPHERAL:
+		ret = cdns3_role_start(cdns, USB_ROLE_DEVICE);
+		if (ret)
+			goto err;
+		break;
+	case USB_DR_MODE_HOST:
+		ret = cdns3_role_start(cdns, USB_ROLE_HOST);
+		if (ret)
+			goto err;
+		break;
 	}
 
 	return ret;
-- 
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