From: Jameson Thies <jthies@google.com>
To: heikki.krogerus@linux.intel.com, linux-usb@vger.kernel.org,
linux-kernel@vger.kernel.org
Cc: bleung@chromium.org, gregkh@linuxfoundation.org,
akuchynski@chromium.org, Jameson Thies <jthies@google.com>
Subject: [PATCH] usb: typec: ucsi: displayport: Current CAM OOB index fixup
Date: Fri, 11 Sep 2026 19:32:08 +0000 [thread overview]
Message-ID: <20260911193208.410015-1-jthies@google.com> (raw)
Update ucsi_displayport_enter() to return invalid error when the PPM
reports an current alternate mode greater than or equal to
UCSI_MAX_ALTMODES. While here, remove 0xff current cam assignment on
failed GET_CURRENT_CAM response.
Signed-off-by: Jameson Thies <jthies@google.com>
---
Original patch didn't incorporate reviewer feedback. This is a fixup
to be amended to:
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=04cec690b1fd9d1c4c314b91a10d8c68a3acfe18
drivers/usb/typec/ucsi/displayport.c | 9 ++++++---
1 file changed, 6 insertions(+), 3 deletions(-)
diff --git a/drivers/usb/typec/ucsi/displayport.c b/drivers/usb/typec/ucsi/displayport.c
index 8d2032d0762c..572da7bbd29c 100644
--- a/drivers/usb/typec/ucsi/displayport.c
+++ b/drivers/usb/typec/ucsi/displayport.c
@@ -71,11 +71,14 @@ static int ucsi_displayport_enter(struct typec_altmode *alt, u32 *vdo)
if (ret < 0) {
if (ucsi->version > 0x0100)
goto err_unlock;
- cur = 0xff;
}
- if (cur < UCSI_MAX_ALTMODES) {
- ret = dp->con->port_altmode[cur] == alt ? 0 : -EBUSY;
+ if (cur != 0xff) {
+ if (cur < UCSI_MAX_ALTMODES)
+ ret = dp->con->port_altmode[cur] == alt ? 0 : -EBUSY;
+ else
+ ret = -EINVAL;
+
goto err_unlock;
}
base-commit: ed2050bc671b44b2c948dbd4347cc534d44ccc9f
--
2.55.0.1007.g17ff1f9808-goog
reply other threads:[~2026-09-11 19:32 UTC|newest]
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