usb: typec: altmodes/displayport: Fix probe pin assign check

While checking Pin Assignments of the port and partner during probe, we
don't take into account whether the peripheral is a plug or receptacle.

This manifests itself in a mode entry failure on certain docks and
dongles with captive cables. For instance, the Startech.com Type-C to DP
dongle (Model #CDP2DP) advertises its DP VDO as 0x405. This would fail
the Pin Assignment compatibility check, despite it supporting
Pin Assignment C as a UFP.

Update the check to use the correct DP Pin Assign macros that
take the peripheral's receptacle bit into account.

Fixes: c1e5c2f0cb8a ("usb: typec: altmodes/displayport: correct pin assignment for UFP receptacles")
Cc: stable@vger.kernel.org
Reported-by: Diana Zigterman <dzigterman@chromium.org>
Signed-off-by: Prashant Malani <pmalani@chromium.org>
Link: https://lore.kernel.org/r/20230208205318.131385-1-pmalani@chromium.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/usb/typec/altmodes/displayport.c b/drivers/usb/typec/altmodes/displayport.c
index 9a6860285fbec44342a45dee74e84af9a4dd2ad3..50b24096eb7f16f0419843a1b68a52be615f3208 100644 (file)
--- a/drivers/usb/typec/altmodes/displayport.c
+++ b/drivers/usb/typec/altmodes/displayport.c
@@ -535,10 +535,10 @@ int dp_altmode_probe(struct typec_altmode *alt)
        /* FIXME: Port can only be DFP_U. */
 
        /* Make sure we have compatiple pin configurations */
-       if (!(DP_CAP_DFP_D_PIN_ASSIGN(port->vdo) &
-             DP_CAP_UFP_D_PIN_ASSIGN(alt->vdo)) &&
-           !(DP_CAP_UFP_D_PIN_ASSIGN(port->vdo) &
-             DP_CAP_DFP_D_PIN_ASSIGN(alt->vdo)))
+       if (!(DP_CAP_PIN_ASSIGN_DFP_D(port->vdo) &
+             DP_CAP_PIN_ASSIGN_UFP_D(alt->vdo)) &&
+           !(DP_CAP_PIN_ASSIGN_UFP_D(port->vdo) &
+             DP_CAP_PIN_ASSIGN_DFP_D(alt->vdo)))
                return -ENODEV;
 
        ret = sysfs_create_group(&alt->dev.kobj, &dp_altmode_group);