linux-kernel - [PATCH v5 2/3] platform/chrome: cros_ec_typec: Avoid setting usb role twice during disconnect

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Date:   Fri, 21 Aug 2020 14:47:23 -0700
From:   Azhar Shaikh <azhar.shaikh@...el.com>
To:     bleung@...omium.org, enric.balletbo@...labora.com,
        groeck@...omium.org, heikki.krogerus@...ux.intel.com,
        pmalani@...omium.org
Cc:     linux-kernel@...r.kernel.org, azhar.shaikh@...el.com,
        rajmohan.mani@...el.com, utkarsh.h.patel@...el.com,
        casey.g.bowman@...el.com
Subject: [PATCH v5 2/3] platform/chrome: cros_ec_typec: Avoid setting usb role twice during disconnect

On disconnect port partner is removed and usb role is set to NONE.
But then in cros_typec_port_update() the role is set again.
Avoid this by moving usb_role_switch_set_role() to
cros_typec_configure_mux().

Suggested-by: Prashant Malani <pmalani@...omium.org>
Signed-off-by: Azhar Shaikh <azhar.shaikh@...el.com>
Reviewed-by: Heikki Krogerus <heikki.krogerus@...ux.intel.com>
---
Changes in v5:
 - Rebased on top of https://lkml.org/lkml/2020/7/10/1063
 - Added Reviewed-by from v4

Changes in v4:
 - Added Suggested-by from v2.

Changes in v3:
 - Move the location of calling usb_role_switch_set_role() to
   end of function in cros_typec_configure_mux() to avoid any change
   in code flow.

Changes in v2:
 - New patch added
 drivers/platform/chrome/cros_ec_typec.c | 11 +++++++----
 1 file changed, 7 insertions(+), 4 deletions(-)

diff --git a/drivers/platform/chrome/cros_ec_typec.c b/drivers/platform/chrome/cros_ec_typec.c
index 739a1c846949..39989069decf 100644
--- a/drivers/platform/chrome/cros_ec_typec.c
+++ b/drivers/platform/chrome/cros_ec_typec.c
@@ -564,7 +564,12 @@ static int cros_typec_configure_mux(struct cros_typec_data *typec, int port_num,
 		ret = -ENOTSUPP;
 	}
 
-	return ret;
+	if (ret)
+		return ret;
+
+	return usb_role_switch_set_role(typec->ports[port_num]->role_sw,
+					pd_ctrl->role & PD_CTRL_RESP_ROLE_DATA
+					? USB_ROLE_HOST : USB_ROLE_DEVICE);
 }
 
 static int cros_typec_port_update(struct cros_typec_data *typec, int port_num)
@@ -621,9 +626,7 @@ static int cros_typec_port_update(struct cros_typec_data *typec, int port_num)
 	if (ret)
 		dev_warn(typec->dev, "Configure muxes failed, err = %d\n", ret);
 
-	return usb_role_switch_set_role(typec->ports[port_num]->role_sw,
-					resp.role & PD_CTRL_RESP_ROLE_DATA
-					? USB_ROLE_HOST : USB_ROLE_DEVICE);
+	return ret;
 }
 
 static int cros_typec_get_cmd_version(struct cros_typec_data *typec)
-- 
2.17.1