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usb: typec: ucsi: Invert DisplayPort role assignment

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commit d092d7edf8 upstream.

The existing implementation assigned these flags backwards, configuring
the partner's DisplayPort role to match the port's role instead of
complementing it.
This prevents proper configuration during DP altmode activation, often
causing `pin_assignment` to remain 0 in `dp_altmode_configure()` and
resulting in VDM negotiation failures:

    [  583.328246] typec port1.1: VDM 0xff01a150 failed

Additionally, the fix ensures that the `pin_assignment` sysfs attribute
displays the correct values.

Cc: stable <stable@kernel.org>
Fixes: af8622f6a5 ("usb: typec: ucsi: Support for DisplayPort alt mode")
Signed-off-by: Andrei Kuchynski <akuchynski@chromium.org>
Reviewed-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Link: https://patch.msgid.link/20260601142837.3240207-1-akuchynski@chromium.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Andrei Kuchynski
2026-07-18 16:53:25 +02:00
committed by Greg Kroah-Hartman
parent 3e1b1ac47e
commit 8c00aec752
1 changed files with 2 additions and 2 deletions
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drivers/usb/typec/ucsi/displayport.c
+2 -2
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@@ -166,12 +166,12 @@ static int ucsi_displayport_status_update(struct ucsi_dp *dp)
* that Multi-function is preferred.
*/
if (DP_CAP_CAPABILITY(cap) & DP_CAP_UFP_D) {
dp->data.status |= DP_STATUS_CON_UFP_D;
dp->data.status |= DP_STATUS_CON_DFP_D;
if (DP_CAP_UFP_D_PIN_ASSIGN(cap) & BIT(DP_PIN_ASSIGN_D))
dp->data.status |= DP_STATUS_PREFER_MULTI_FUNC;
} else {
dp->data.status |= DP_STATUS_CON_DFP_D;
dp->data.status |= DP_STATUS_CON_UFP_D;
if (DP_CAP_DFP_D_PIN_ASSIGN(cap) & BIT(DP_PIN_ASSIGN_D))
dp->data.status |= DP_STATUS_PREFER_MULTI_FUNC;