linux-kernel - [PATCH v7 2/5] usb: chipidea: msm: Configure phy for appropriate mode

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Date:   Fri, 20 Jan 2017 10:50:54 -0800
From:   Stephen Boyd <stephen.boyd@...aro.org>
To:     Peter Chen <peter.chen@....com>,
        Kishon Vijay Abraham I <kishon@...com>
Cc:     linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-arm-msm@...r.kernel.org, Andy Gross <andy.gross@...aro.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Neil Armstrong <narmstrong@...libre.com>,
        Arnd Bergmann <arnd@...db.de>, Felipe Balbi <balbi@...nel.org>,
        linux-usb@...r.kernel.org,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: [PATCH v7 2/5] usb: chipidea: msm: Configure phy for appropriate mode

When the qcom chipidea controller is used with an extcon, we need
to signal device mode or host mode to the phy so it can configure
itself for the correct mode. This should be done after the phy is
powered up, so that the register writes work correctly. Add in
the appropriate phy_set_mode() call here.

To signal the correct state to the qcom glue driver we need to
change the ci->role before we do the role switch. Make sure to
undo the change if the role switch fails, but otherwise update
the state before calling the role start function so that the glue
driver knows what state to configure for.

Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Signed-off-by: Stephen Boyd <stephen.boyd@...aro.org>
---

Made this msm specific because of how msm handles phy powerup.

 drivers/usb/chipidea/ci.h          | 7 +++++--
 drivers/usb/chipidea/ci_hdrc_msm.c | 4 ++++
 2 files changed, 9 insertions(+), 2 deletions(-)

diff --git a/drivers/usb/chipidea/ci.h b/drivers/usb/chipidea/ci.h
index 59e22389c10b..18348b0529af 100644
--- a/drivers/usb/chipidea/ci.h
+++ b/drivers/usb/chipidea/ci.h
@@ -268,6 +268,7 @@ static inline struct ci_role_driver *ci_role(struct ci_hdrc *ci)
 static inline int ci_role_start(struct ci_hdrc *ci, enum ci_role role)
 {
 	int ret;
+	enum ci_role prev_role;
 
 	if (role >= CI_ROLE_END)
 		return -EINVAL;
@@ -275,9 +276,11 @@ static inline int ci_role_start(struct ci_hdrc *ci, enum ci_role role)
 	if (!ci->roles[role])
 		return -ENXIO;
 
+	prev_role = ci->role;
+	ci->role = role;
 	ret = ci->roles[role]->start(ci);
-	if (!ret)
-		ci->role = role;
+	if (ret)
+		ci->role = prev_role;
 	return ret;
 }
 
diff --git a/drivers/usb/chipidea/ci_hdrc_msm.c b/drivers/usb/chipidea/ci_hdrc_msm.c
index f1ede7909f54..9c58d13970ca 100644
--- a/drivers/usb/chipidea/ci_hdrc_msm.c
+++ b/drivers/usb/chipidea/ci_hdrc_msm.c
@@ -125,6 +125,10 @@ static int ci_hdrc_msm_notify_event(struct ci_hdrc *ci, unsigned event)
 			hw_write(ci, OP_USBCMD, HSPHY_SESS_VLD_CTRL,
 				 HSPHY_SESS_VLD_CTRL);
 
+			if (ci->role == CI_ROLE_GADGET)
+				phy_set_mode(ci->phy, PHY_MODE_USB_DEVICE);
+			else if (ci->role == CI_ROLE_HOST)
+				phy_set_mode(ci->phy, PHY_MODE_USB_HOST);
 		}
 		break;
 	case CI_HDRC_CONTROLLER_STOPPED_EVENT:
-- 
2.10.0.297.gf6727b0