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From: Heikki Krogerus <heikki.krogerus@linux.intel.com>
To: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Ajay Gupta <ajayg@nvidia.com>,
	linux-usb@vger.kernel.org, stable@vger.kernel.org
Subject: [PATCH 2/2] usb: typec: ucsi: displayport: Fix for the mode entering routine
Date: Fri,  4 Oct 2019 13:02:19 +0300
Message-ID: <20191004100219.71152-3-heikki.krogerus@linux.intel.com> (raw)
In-Reply-To: <20191004100219.71152-1-heikki.krogerus@linux.intel.com>

Making sure that ucsi_displayport_enter() function does not
return an error if the displayport alternate mode has
already been entered. It's normal that the firmware (or
controller) has already entered the alternate mode by the
time the operating system is notified about the device.

Fixes: af8622f6a585 ("usb: typec: ucsi: Support for DisplayPort alt mode")
Cc: stable@vger.kernel.org
Signed-off-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
---
 drivers/usb/typec/ucsi/displayport.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/usb/typec/ucsi/displayport.c b/drivers/usb/typec/ucsi/displayport.c
index 6c103697c582..d99700cb4dca 100644
--- a/drivers/usb/typec/ucsi/displayport.c
+++ b/drivers/usb/typec/ucsi/displayport.c
@@ -75,6 +75,8 @@ static int ucsi_displayport_enter(struct typec_altmode *alt)
 
 	if (cur != 0xff) {
 		mutex_unlock(&dp->con->lock);
+		if (dp->con->port_altmode[cur] == alt)
+			return 0;
 		return -EBUSY;
 	}
 
-- 
2.23.0


      parent reply index

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-10-04 10:02 [PATCH 0/2] UCSI driver fixes Heikki Krogerus
2019-10-04 10:02 ` [PATCH 1/2] usb: typec: ucsi: ccg: Remove run_isr flag Heikki Krogerus
2019-10-04 10:02 ` Heikki Krogerus [this message]

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