[PATCH v1 3/3] usb: typec: displayport: Check cable altmode support

[Andrei Kuchynski]

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@xxxxxxxxxxxx>
---
 drivers/usb/typec/altmodes/displayport.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/usb/typec/altmodes/displayport.c b/drivers/usb/typec/altmodes/displayport.c
index 263a89c5f3243..5ee33a69b9cf7 100644
--- a/drivers/usb/typec/altmodes/displayport.c
+++ b/drivers/usb/typec/altmodes/displayport.c
@@ -790,7 +790,6 @@ 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";
@@ -811,6 +810,10 @@ 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);
-- 
2.54.0.1099.g489fc7bff1-goog