FAILED: patch "[PATCH] usb: typec: tcpm: Respond Not_Supported if no snk_vdo" failed to apply to 4.19-stable tree

[<gregkh@linuxfoundation.org>]

The patch below does not apply to the 4.19-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to <stable@vger.kernel.org>.

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From a20dcf53ea9836387b229c4878f9559cf1b55b71 Mon Sep 17 00:00:00 2001
From: Kyle Tso <kyletso@google.com>
Date: Sun, 23 May 2021 09:58:55 +0800
Subject: [PATCH] usb: typec: tcpm: Respond Not_Supported if no snk_vdo

If snk_vdo is not populated from fwnode, it implies the port does not
support responding to SVDM commands. Not_Supported Message shall be sent
if the contract is in PD3. And for PD2, the port shall ignore the
commands.

Fixes: 193a68011fdc ("staging: typec: tcpm: Respond to Discover Identity commands")
Cc: stable <stable@vger.kernel.org>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Acked-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Signed-off-by: Kyle Tso <kyletso@google.com>
Link: https://lore.kernel.org/r/20210523015855.1785484-3-kyletso@google.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/usb/typec/tcpm/tcpm.c b/drivers/usb/typec/tcpm/tcpm.c
index 6ea5df3782cf..9ce8c9af4da5 100644
--- a/drivers/usb/typec/tcpm/tcpm.c
+++ b/drivers/usb/typec/tcpm/tcpm.c
@@ -2430,7 +2430,10 @@ static void tcpm_pd_data_request(struct tcpm_port *port,
 					   NONE_AMS);
 		break;
 	case PD_DATA_VENDOR_DEF:
-		tcpm_handle_vdm_request(port, msg->payload, cnt);
+		if (tcpm_vdm_ams(port) || port->nr_snk_vdo)
+			tcpm_handle_vdm_request(port, msg->payload, cnt);
+		else if (port->negotiated_rev > PD_REV20)
+			tcpm_pd_handle_msg(port, PD_MSG_CTRL_NOT_SUPP, NONE_AMS);
 		break;
 	case PD_DATA_BIST:
 		port->bist_request = le32_to_cpu(msg->payload[0]);