diff options
| -rw-r--r-- | common/usbc/usb_pe_drp_sm.c | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/common/usbc/usb_pe_drp_sm.c b/common/usbc/usb_pe_drp_sm.c index e57acc173e..d5911168e3 100644 --- a/common/usbc/usb_pe_drp_sm.c +++ b/common/usbc/usb_pe_drp_sm.c @@ -5938,7 +5938,13 @@ static void pe_vdm_response_entry(int port) CPRINTF("VDO ERR:CMD:%d\n", vdo_cmd); } - if (func) { + /* + * If the port partner is PD_REV20 and our data role is DFP, we must + * reply to any SVDM command with a NAK. If the SVDM was an Attention + * command, it does not have a response, and exits the function above. + */ + if (func && (prl_get_rev(port, TCPC_TX_SOP) != PD_REV20 || + pe[port].data_role == PD_ROLE_UFP)) { /* * Execute SVDM response function selected above and set the * correct response type in the VDM header. |