linux-kernel - [PATCH 3/4] platform/chrome: cros_ec_typec: Configure muxes at start of port update

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Message-Id: <20220207214026.1526151-4-pmalani@chromium.org>
Date:   Mon,  7 Feb 2022 21:40:28 +0000
From:   Prashant Malani <pmalani@...omium.org>
To:     linux-kernel@...r.kernel.org
Cc:     Prashant Malani <pmalani@...omium.org>,
        Benson Leung <bleung@...omium.org>,
        Guenter Roeck <groeck@...omium.org>,
        chrome-platform@...ts.linux.dev (open list:CHROMEOS EC USB TYPE-C
        DRIVER)
Subject: [PATCH 3/4] platform/chrome: cros_ec_typec: Configure muxes at start of port update

There are situations where the mux state reported by the Embedded
Controller (EC), might lag the partner "connected" state. So, the mux
state might still suggest that a partner is connected, while the PD
"connected" state, being in Try.SNK (for example) suggests that the
partner is disconnected.

In such a scenario, we will end up sending a disconnect command to the
mux driver, followed by a connect command, since the mux is configured
later. Avoid this by configuring the mux before
registering/disconnecting a partner.

Signed-off-by: Prashant Malani <pmalani@...omium.org>
---
 drivers/platform/chrome/cros_ec_typec.c | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/drivers/platform/chrome/cros_ec_typec.c b/drivers/platform/chrome/cros_ec_typec.c
index 671d3569faf6..164c82f537dd 100644
--- a/drivers/platform/chrome/cros_ec_typec.c
+++ b/drivers/platform/chrome/cros_ec_typec.c
@@ -965,6 +965,11 @@ static int cros_typec_port_update(struct cros_typec_data *typec, int port_num)
 	if (ret < 0)
 		return ret;
 
+	/* Update the switches if they exist, according to requested state */
+	ret = cros_typec_configure_mux(typec, port_num, &resp);
+	if (ret)
+		dev_warn(typec->dev, "Configure muxes failed, err = %d\n", ret);
+
 	dev_dbg(typec->dev, "Enabled %d: 0x%hhx\n", port_num, resp.enabled);
 	dev_dbg(typec->dev, "Role %d: 0x%hhx\n", port_num, resp.role);
 	dev_dbg(typec->dev, "Polarity %d: 0x%hhx\n", port_num, resp.polarity);
@@ -980,11 +985,6 @@ static int cros_typec_port_update(struct cros_typec_data *typec, int port_num)
 	if (typec->typec_cmd_supported)
 		cros_typec_handle_status(typec, port_num);
 
-	/* Update the switches if they exist, according to requested state */
-	ret = cros_typec_configure_mux(typec, port_num, &resp);
-	if (ret)
-		dev_warn(typec->dev, "Configure muxes failed, err = %d\n", ret);
-
 	return ret;
 }
 
-- 
2.35.0.263.gb82422642f-goog