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usb: typec: ucsi: Pass full DP config payload in SET_NEW_CAM for DP alt mode

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commit 735a461d06 upstream.

In the UCSI Specification Revision 3.1 RC1, bits 32-63 of the SET_NEW_CAM
command hold the 32-bit Alternate Mode Specific (AMSpecific) field.

For DisplayPort Alternate Mode, this field must contain the full
32-bit DisplayPort configuration VDO payload that the OPM wants the
connector to operate in, rather than just the pin assignment value.
This AMSpecific value follows the DisplayPort Configurations defined
in the DisplayPort Alt Mode on USB Type-C Specification v2.1a,
Table 5-13: SOP DisplayPort Configurations.

Fixes: af8622f6a5 ("usb: typec: ucsi: Support for DisplayPort alt mode")
Cc: stable <stable@kernel.org>
Signed-off-by: Madhu M <madhu.m@intel.com>
Reviewed-by: Jameson Thies <jthies@google.com>
Reviewed-by: Andrei Kuchynski <akuchynski@chromium.org>
Reviewed-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Link: https://patch.msgid.link/20260619153311.3526083-1-madhu.m@intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Madhu M
2026-07-18 16:53:25 +02:00
committed by Greg Kroah-Hartman
parent 8c00aec752
commit b1dfdff51a
1 changed files with 1 additions and 2 deletions
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drivers/usb/typec/ucsi/displayport.c
+1 -2
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@@ -185,13 +185,12 @@ static int ucsi_displayport_status_update(struct ucsi_dp *dp)
static int ucsi_displayport_configure(struct ucsi_dp *dp)
{
u32 pins = DP_CONF_GET_PIN_ASSIGN(dp->data.conf);
u64 command;
if (!dp->override)
return 0;
command = UCSI_CMD_SET_NEW_CAM(dp->con->num, 1, dp->offset, pins);
command = UCSI_CMD_SET_NEW_CAM(dp->con->num, 1, dp->offset, dp->data.conf);
return ucsi_send_command(dp->con->ucsi, command, NULL, 0);
}