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author | Prashant Malani <pmalani@chromium.org> | 2023-02-08 23:53:19 +0300 |
---|---|---|
committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2023-02-22 14:47:18 +0300 |
commit | 0f8f7a455200ceb863244dea3c971af10b59236a (patch) | |
tree | 0267687f2f1269ea14c5c72aa278e3ac92fcaea0 | |
parent | cf31e274729dbced4649e1ed4dda41d50650d4ff (diff) | |
download | linux-0f8f7a455200ceb863244dea3c971af10b59236a.tar.xz |
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>
-rw-r--r-- | drivers/usb/typec/altmodes/displayport.c | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/drivers/usb/typec/altmodes/displayport.c b/drivers/usb/typec/altmodes/displayport.c index 2ae3fab36a80..7387f52cb58d 100644 --- 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_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); |