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usb: typec: displayport: Check cable altmode support

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Update the probe function to utilize the new
typec_cable_altmode_unsupported() helper. If the cable doesn't support
DisplayPort altmode, don't initialize altmode_ops and prevent altmode
from being activated.
A captive cable shouldn't be checked; it may not provide discoverable
capability information, but it is inherently designed to support the
device's requirements.

Signed-off-by: Andrei Kuchynski <akuchynski@chromium.org>
Reviewed-by: Benson Leung <bleung@chromium.org>
Reviewed-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Link: https://patch.msgid.link/20260626142702.1941182-4-akuchynski@chromium.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Andrei Kuchynski
2026-06-26 14:27:02 +00:00
committed by Greg Kroah-Hartman
parent 07f0d51a8e
commit ef14df3670
1 changed files with 4 additions and 1 deletions
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5
drivers/usb/typec/altmodes/displayport.c
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@@ -803,7 +803,6 @@ int dp_altmode_probe(struct typec_altmode *alt)
dp->alt = alt;
alt->desc = "DisplayPort";
typec_altmode_set_ops(alt, &dp_altmode_ops);
if (plug) {
plug->desc = "Displayport";
@@ -824,6 +823,10 @@ int dp_altmode_probe(struct typec_altmode *alt)
if (plug)
typec_altmode_set_drvdata(plug, dp);
if ((alt->vdo & DP_CAP_RECEPTACLE) && typec_cable_altmode_unsupported(alt))
return 0;
typec_altmode_set_ops(alt, &dp_altmode_ops);
if (!alt->mode_selection) {
dp->state = plug ? DP_STATE_ENTER_PRIME : DP_STATE_ENTER;
schedule_work(&dp->work);