linux-kernel - [PATCH 4.16 17/43] usb: typec: wcove: Remove dependency on HW FSM

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Date:   Thu, 14 Jun 2018 16:04:21 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Heikki Krogerus <heikki.krogerus@...ux.intel.com>
Subject: [PATCH 4.16 17/43] usb: typec: wcove: Remove dependency on HW FSM

4.16-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Heikki Krogerus <heikki.krogerus@...ux.intel.com>

commit 05826ff135ee083d28c006fbde6e810f17437166 upstream.

The USB Type-C PHY in Intel WhiskeyCove PMIC has build-in
USB Type-C state machine which we were relying on to
configure the CC lines correctly. This patch removes that
dependency and configures the CC line according to commands
from the port manager (tcpm.c) in wcove_set_cc().

This fixes an issue where USB devices attached to the USB
Type-C port do not get enumerated. When acting as
source/host, the HW FSM sometimes fails to configure the PHY
correctly.

Fixes: 3c4fb9f16921 ("usb: typec: wcove: start using tcpm for USB PD support")
Cc: stable@...r.kernel.org
Signed-off-by: Heikki Krogerus <heikki.krogerus@...ux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/usb/typec/typec_wcove.c |   30 ++++++++++++++++++++++++++++--
 1 file changed, 28 insertions(+), 2 deletions(-)

--- a/drivers/usb/typec/typec_wcove.c
+++ b/drivers/usb/typec/typec_wcove.c
@@ -202,6 +202,10 @@ static int wcove_init(struct tcpc_dev *t
 	struct wcove_typec *wcove = tcpc_to_wcove(tcpc);
 	int ret;
 
+	ret = regmap_write(wcove->regmap, USBC_CONTROL1, 0);
+	if (ret)
+		return ret;
+
 	/* Unmask everything */
 	ret = regmap_write(wcove->regmap, USBC_IRQMASK1, 0);
 	if (ret)
@@ -285,8 +289,30 @@ static int wcove_get_cc(struct tcpc_dev
 
 static int wcove_set_cc(struct tcpc_dev *tcpc, enum typec_cc_status cc)
 {
-	/* XXX: Relying on the HW FSM to configure things correctly for now */
-	return 0;
+	struct wcove_typec *wcove = tcpc_to_wcove(tcpc);
+	unsigned int ctrl;
+
+	switch (cc) {
+	case TYPEC_CC_RD:
+		ctrl = USBC_CONTROL1_MODE_SNK;
+		break;
+	case TYPEC_CC_RP_DEF:
+		ctrl = USBC_CONTROL1_CURSRC_UA_80 | USBC_CONTROL1_MODE_SRC;
+		break;
+	case TYPEC_CC_RP_1_5:
+		ctrl = USBC_CONTROL1_CURSRC_UA_180 | USBC_CONTROL1_MODE_SRC;
+		break;
+	case TYPEC_CC_RP_3_0:
+		ctrl = USBC_CONTROL1_CURSRC_UA_330 | USBC_CONTROL1_MODE_SRC;
+		break;
+	case TYPEC_CC_OPEN:
+		ctrl = 0;
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	return regmap_write(wcove->regmap, USBC_CONTROL1, ctrl);
 }
 
 static int wcove_set_polarity(struct tcpc_dev *tcpc, enum typec_cc_polarity pol)