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usb: typec: ucsi: displayport: Fix for the mode entering routine

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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: af8622f6a5 ("usb: typec: ucsi: Support for DisplayPort alt mode")
Cc: stable@vger.kernel.org
Signed-off-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Link: https://lore.kernel.org/r/20191004100219.71152-3-heikki.krogerus@linux.intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Heikki Krogerus 2019-10-04 13:02:19 +03:00 committed by Greg Kroah-Hartman
parent 8530e4e20e
commit f2372b87c3
1 changed files with 2 additions and 0 deletions
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2
drivers/usb/typec/ucsi/displayport.c
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@ -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;
}