usb: typec: altmodes/displayport: Fix probe pin assign check
authorPrashant Malani <pmalani@chromium.org>
Wed, 8 Feb 2023 20:53:19 +0000 (20:53 +0000)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Tue, 14 Feb 2023 18:18:03 +0000 (19:18 +0100)
commit239e927eb2ea67a99667804a673d7bc86292ca42
tree2473af0ca00c65f3efe89998c87ecb70aa11bb22
parent48aecce116e4aca5627f720b3e29d8ee97899563
usb: typec: altmodes/displayport: Fix probe pin assign check

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