diff options
| author | Andrei Kuchynski <akuchynski@chromium.org> | 2026-06-26 14:27:02 +0000 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2026-07-08 17:07:31 +0200 |
| commit | ef14df36701cca2d272c18450d12de9d141e5beb (patch) | |
| tree | 421de415d6be47c5445587e9b9a354f169218db8 | |
| parent | 07f0d51a8ea57b0d29c35fd0c81f4f452ff60f22 (diff) | |
| download | linux-ef14df36701cca2d272c18450d12de9d141e5beb.tar.gz linux-ef14df36701cca2d272c18450d12de9d141e5beb.zip | |
usb: typec: displayport: Check cable altmode support
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>
| -rw-r--r-- | drivers/usb/typec/altmodes/displayport.c | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/drivers/usb/typec/altmodes/displayport.c b/drivers/usb/typec/altmodes/displayport.c index 2a553cfcf61d..51c92dd887ab 100644 --- a/drivers/usb/typec/altmodes/displayport.c +++ b/drivers/usb/typec/altmodes/displayport.c @@ -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); |