linux-kernel - [PATCH v7 4/5] usb: chipidea: Signal vbus state to phy

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Date:   Fri, 20 Jan 2017 10:50:56 -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 4/5] usb: chipidea: Signal vbus state to phy

Some USB PHYs need to be told about vbus changing state
explicitly. For example the qcom USB HS PHY needs to toggle a bit
when vbus goes from low to high (VBUSVLDEXT) to cause the
"session valid" signal to toggle. This signal will pull up D+
when the phy starts running. Add the appropriate phy_set_vbus()
call here to signal vbus state changes to the phy.

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

New patch

 drivers/usb/chipidea/otg.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/drivers/usb/chipidea/otg.c b/drivers/usb/chipidea/otg.c
index 10236fe71522..6ea702beed48 100644
--- a/drivers/usb/chipidea/otg.c
+++ b/drivers/usb/chipidea/otg.c
@@ -134,10 +134,13 @@ void ci_handle_vbus_change(struct ci_hdrc *ci)
 	if (!ci->is_otg)
 		return;
 
-	if (hw_read_otgsc(ci, OTGSC_BSV) && !ci->vbus_active)
+	if (hw_read_otgsc(ci, OTGSC_BSV) && !ci->vbus_active) {
 		usb_gadget_vbus_connect(&ci->gadget);
-	else if (!hw_read_otgsc(ci, OTGSC_BSV) && ci->vbus_active)
+		phy_set_vbus(ci->phy, 1);
+	} else if (!hw_read_otgsc(ci, OTGSC_BSV) && ci->vbus_active) {
+		phy_set_vbus(ci->phy, 0);
 		usb_gadget_vbus_disconnect(&ci->gadget);
+	}
 }
 
 /**
-- 
2.10.0.297.gf6727b0