linux-kernel - [RFC PATCH 2/7] usb: typec: ucsi: Don't stop alt mode registration on busy condition

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Message-Id: <20210607131442.20121-3-heikki.krogerus@linux.intel.com>
Date:   Mon,  7 Jun 2021 16:14:37 +0300
From:   Heikki Krogerus <heikki.krogerus@...ux.intel.com>
To:     Benjamin Berg <bberg@...hat.com>
Cc:     linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [RFC PATCH 2/7] usb: typec: ucsi: Don't stop alt mode registration on busy condition

If the PPM tells it's busy, we can now simply try again.

Signed-off-by: Heikki Krogerus <heikki.krogerus@...ux.intel.com>
---
 drivers/usb/typec/ucsi/ucsi.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/usb/typec/ucsi/ucsi.c b/drivers/usb/typec/ucsi/ucsi.c
index 366c8a468bc18..a8e0e31dcddf5 100644
--- a/drivers/usb/typec/ucsi/ucsi.c
+++ b/drivers/usb/typec/ucsi/ucsi.c
@@ -437,8 +437,11 @@ static int ucsi_register_altmodes(struct ucsi_connector *con, u8 recipient)
 		command |= UCSI_GET_ALTMODE_CONNECTOR_NUMBER(con->num);
 		command |= UCSI_GET_ALTMODE_OFFSET(i);
 		len = ucsi_send_command(con->ucsi, command, alt, sizeof(alt));
-		if (len <= 0)
+		if (len <= 0) {
+			if (len == -EBUSY)
+				continue;
 			return len;
+		}
 
 		/*
 		 * This code is requesting one alt mode at a time, but some PPMs
-- 
2.30.2