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Date:   Tue,  2 Feb 2021 17:33:38 +0800
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Subject: [PATCH v4 4/8] usb: typec: tcpm: Detemine common SVDM Version
From:   Kyle Tso <kyletso@google.com>
To:     linux@roeck-us.net, heikki.krogerus@linux.intel.com,
        gregkh@linuxfoundation.org, hdegoede@redhat.com, robh+dt@kernel.org
Cc:     badhri@google.com, linux-usb@vger.kernel.org,
        linux-kernel@vger.kernel.org, devicetree@vger.kernel.org,
        Kyle Tso <kyletso@google.com>
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Precedence: bulk

PD Spec Revision 3.0 Version 2.0 + ECNs 2020-12-10
  6.4.4.2.3 Structured VDM Version
  "The Structured VDM Version field of the Discover Identity Command
  sent and received during VDM discovery Shall be used to determine the
  lowest common Structured VDM Version supported by the Port Partners or
  Cable Plug and Shall continue to operate using this Specification
  Revision until they are Detached."

Also clear the fields newly defined in SVDM version 2.0 for
compatibilities.

Signed-off-by: Kyle Tso <kyletso@google.com>
---
 drivers/usb/typec/tcpm/tcpm.c | 47 +++++++++++++++++++++++++++++------
 1 file changed, 39 insertions(+), 8 deletions(-)

diff --git a/drivers/usb/typec/tcpm/tcpm.c b/drivers/usb/typec/tcpm/tcpm.c
index 0afd8ef692e8..979b7ee6473c 100644
--- a/drivers/usb/typec/tcpm/tcpm.c
+++ b/drivers/usb/typec/tcpm/tcpm.c
@@ -1475,6 +1475,7 @@ static int tcpm_pd_svdm(struct tcpm_port *port, struct typec_altmode *adev,
 			const u32 *p, int cnt, u32 *response,
 			enum adev_actions *adev_action)
 {
+	struct typec_port *typec = port->typec_port;
 	struct typec_altmode *pdev;
 	struct pd_mode_data *modep;
 	int rlen = 0;
@@ -1500,10 +1501,21 @@ static int tcpm_pd_svdm(struct tcpm_port *port, struct typec_altmode *adev,
 			if (PD_VDO_VID(p[0]) != USB_SID_PD)
 				break;
 
+			if (PD_VDO_SVDM_VER(p[0]) < typec_get_svdm_version(typec))
+				typec_set_svdm_version(typec, PD_VDO_SVDM_VER(p[0]));
 			/* 6.4.4.3.1: Only respond as UFP (device) */
 			if (port->data_role == TYPEC_DEVICE &&
 			    port->nr_snk_vdo) {
-				for (i = 0; i <  port->nr_snk_vdo; i++)
+				/*
+				 * Product Type DFP and Connector Type are not defined in SVDM
+				 * version 1.0 and shall be set to zero.
+				 */
+				if (typec_get_svdm_version(typec) < SVDM_VER_2_0)
+					response[1] = port->snk_vdo[0] & ~IDH_DFP_MASK
+						      & ~IDH_CONN_MASK;
+				else
+					response[1] = port->snk_vdo[0];
+				for (i = 1; i <  port->nr_snk_vdo; i++)
 					response[i + 1] = port->snk_vdo[i];
 				rlen = port->nr_snk_vdo + 1;
 			}
@@ -1532,6 +1544,8 @@ static int tcpm_pd_svdm(struct tcpm_port *port, struct typec_altmode *adev,
 			response[0] = p[0] | VDO_CMDT(CMDT_RSP_BUSY);
 			rlen = 1;
 		}
+		response[0] = (response[0] & ~VDO_SVDM_VERS_MASK) |
+			      (VDO_SVDM_VERS(typec_get_svdm_version(typec)));
 		break;
 	case CMDT_RSP_ACK:
 		/* silently drop message if we are not connected */
@@ -1542,19 +1556,23 @@ static int tcpm_pd_svdm(struct tcpm_port *port, struct typec_altmode *adev,
 
 		switch (cmd) {
 		case CMD_DISCOVER_IDENT:
+			if (PD_VDO_SVDM_VER(p[0]) < typec_get_svdm_version(typec))
+				typec_set_svdm_version(typec, PD_VDO_SVDM_VER(p[0]));
 			/* 6.4.4.3.1 */
 			svdm_consume_identity(port, p, cnt);
-			response[0] = VDO(USB_SID_PD, 1, CMD_DISCOVER_SVID);
+			response[0] = VDO(USB_SID_PD, 1, typec_get_svdm_version(typec),
+					  CMD_DISCOVER_SVID);
 			rlen = 1;
 			break;
 		case CMD_DISCOVER_SVID:
 			/* 6.4.4.3.2 */
 			if (svdm_consume_svids(port, p, cnt)) {
-				response[0] = VDO(USB_SID_PD, 1,
+				response[0] = VDO(USB_SID_PD, 1, typec_get_svdm_version(typec),
 						  CMD_DISCOVER_SVID);
 				rlen = 1;
 			} else if (modep->nsvids && supports_modal(port)) {
 				response[0] = VDO(modep->svids[0], 1,
+						  typec_get_svdm_version(typec),
 						  CMD_DISCOVER_MODES);
 				rlen = 1;
 			}
@@ -1565,7 +1583,8 @@ static int tcpm_pd_svdm(struct tcpm_port *port, struct typec_altmode *adev,
 			modep->svid_index++;
 			if (modep->svid_index < modep->nsvids) {
 				u16 svid = modep->svids[modep->svid_index];
-				response[0] = VDO(svid, 1, CMD_DISCOVER_MODES);
+				response[0] = VDO(svid, 1, typec_get_svdm_version(typec),
+						  CMD_DISCOVER_MODES);
 				rlen = 1;
 			} else {
 				tcpm_register_partner_altmodes(port);
@@ -1592,6 +1611,8 @@ static int tcpm_pd_svdm(struct tcpm_port *port, struct typec_altmode *adev,
 			/* Unrecognized SVDM */
 			response[0] = p[0] | VDO_CMDT(CMDT_RSP_NAK);
 			rlen = 1;
+			response[0] = (response[0] & ~VDO_SVDM_VERS_MASK) |
+				      (VDO_SVDM_VERS(typec_get_svdm_version(typec)));
 			break;
 		}
 		break;
@@ -1611,6 +1632,8 @@ static int tcpm_pd_svdm(struct tcpm_port *port, struct typec_altmode *adev,
 			/* Unrecognized SVDM */
 			response[0] = p[0] | VDO_CMDT(CMDT_RSP_NAK);
 			rlen = 1;
+			response[0] = (response[0] & ~VDO_SVDM_VERS_MASK) |
+				      (VDO_SVDM_VERS(typec_get_svdm_version(typec)));
 			break;
 		}
 		port->vdm_sm_running = false;
@@ -1618,6 +1641,8 @@ static int tcpm_pd_svdm(struct tcpm_port *port, struct typec_altmode *adev,
 	default:
 		response[0] = p[0] | VDO_CMDT(CMDT_RSP_NAK);
 		rlen = 1;
+		response[0] = (response[0] & ~VDO_SVDM_VERS_MASK) |
+			      (VDO_SVDM_VERS(typec_get_svdm_version(typec)));
 		port->vdm_sm_running = false;
 		break;
 	}
@@ -1695,7 +1720,9 @@ static void tcpm_handle_vdm_request(struct tcpm_port *port,
 			break;
 		case ADEV_QUEUE_VDM_SEND_EXIT_MODE_ON_FAIL:
 			if (typec_altmode_vdm(adev, p[0], &p[1], cnt)) {
-				response[0] = VDO(adev->svid, 1, CMD_EXIT_MODE);
+				response[0] = VDO(adev->svid, 1,
+						  typec_get_svdm_version(port->typec_port),
+						  CMD_EXIT_MODE);
 				response[0] |= VDO_OPOS(adev->mode);
 				rlen = 1;
 			}
@@ -1729,7 +1756,8 @@ static void tcpm_send_vdm(struct tcpm_port *port, u32 vid, int cmd,
 
 	/* set VDM header with VID & CMD */
 	header = VDO(vid, ((vid & USB_SID_PD) == USB_SID_PD) ?
-			1 : (PD_VDO_CMD(cmd) <= CMD_ATTENTION), cmd);
+			1 : (PD_VDO_CMD(cmd) <= CMD_ATTENTION),
+			typec_get_svdm_version(port->typec_port), cmd);
 	tcpm_queue_vdm(port, header, data, count);
 }
 
@@ -2024,7 +2052,8 @@ static int tcpm_altmode_enter(struct typec_altmode *altmode, u32 *vdo)
 	struct tcpm_port *port = typec_altmode_get_drvdata(altmode);
 	u32 header;
 
-	header = VDO(altmode->svid, vdo ? 2 : 1, CMD_ENTER_MODE);
+	header = VDO(altmode->svid, vdo ? 2 : 1, typec_get_svdm_version(port->typec_port),
+		     CMD_ENTER_MODE);
 	header |= VDO_OPOS(altmode->mode);
 
 	tcpm_queue_vdm_unlocked(port, header, vdo, vdo ? 1 : 0);
@@ -2036,7 +2065,7 @@ static int tcpm_altmode_exit(struct typec_altmode *altmode)
 	struct tcpm_port *port = typec_altmode_get_drvdata(altmode);
 	u32 header;
 
-	header = VDO(altmode->svid, 1, CMD_EXIT_MODE);
+	header = VDO(altmode->svid, 1, typec_get_svdm_version(port->typec_port), CMD_EXIT_MODE);
 	header |= VDO_OPOS(altmode->mode);
 
 	tcpm_queue_vdm_unlocked(port, header, NULL, 0);
@@ -3445,6 +3474,7 @@ static void tcpm_reset_port(struct tcpm_port *port)
 	port->attached = false;
 	port->pd_capable = false;
 	port->pps_data.supported = false;
+	typec_set_svdm_version(port->typec_port, port->typec_caps.svdm_version);
 
 	/*
 	 * First Rx ID should be 0; set this to a sentinel of -1 so that
@@ -5952,6 +5982,7 @@ struct tcpm_port *tcpm_register_port(struct device *dev, struct tcpc_dev *tcpc)
 	port->typec_caps.fwnode = tcpc->fwnode;
 	port->typec_caps.revision = 0x0120;	/* Type-C spec release 1.2 */
 	port->typec_caps.pd_revision = 0x0300;	/* USB-PD spec release 3.0 */
+	port->typec_caps.svdm_version = SVDM_VER_2_0;
 	port->typec_caps.driver_data = port;
 	port->typec_caps.ops = &tcpm_ops;
 	port->typec_caps.orientation_aware = 1;
-- 
2.30.0.365.g02bc693789-goog