From: Prashant Malani pmalani@chromium.org
commit 54e5c00a4eb0a4c663445b245f641bbfab142430 upstream.
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 --- drivers/usb/typec/altmodes/displayport.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-)
--- a/drivers/usb/typec/altmodes/displayport.c +++ b/drivers/usb/typec/altmodes/displayport.c @@ -526,10 +526,10 @@ static int dp_altmode_probe(struct typec /* 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);