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Message-ID: <20210212041756.GC103223@roeck-us.net>
Date: Thu, 11 Feb 2021 20:17:56 -0800
From: Guenter Roeck <linux@...ck-us.net>
To: Kyle Tso <kyletso@...gle.com>
Cc: heikki.krogerus@...ux.intel.com, gregkh@...uxfoundation.org,
hdegoede@...hat.com, robh+dt@...nel.org, badhri@...gle.com,
linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
devicetree@...r.kernel.org
Subject: Re: [PATCH v6 3/7] usb: typec: tcpm: Determine common SVDM Version
On Fri, Feb 05, 2021 at 11:34:11AM +0800, Kyle Tso wrote:
> 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 if the
> negotiated SVDM version is 1.0.
>
> Signed-off-by: Kyle Tso <kyletso@...gle.com>
> ---
> Changes since v5:
> - follow the changes of "usb: typec: Manage SVDM version"
> - remove the "reset to default". Now the default SVDM version will be
> set when calling to typec_register_partner
>
> drivers/usb/typec/tcpm/tcpm.c | 71 ++++++++++++++++++++++++++++++-----
> 1 file changed, 61 insertions(+), 10 deletions(-)
>
> diff --git a/drivers/usb/typec/tcpm/tcpm.c b/drivers/usb/typec/tcpm/tcpm.c
> index 9aadb1e1bec5..b45cd191a8a4 100644
> --- a/drivers/usb/typec/tcpm/tcpm.c
> +++ b/drivers/usb/typec/tcpm/tcpm.c
> @@ -1475,8 +1475,10 @@ 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 svdm_version;
> int rlen = 0;
> int cmd_type;
> int cmd;
> @@ -1493,6 +1495,10 @@ static int tcpm_pd_svdm(struct tcpm_port *port, struct typec_altmode *adev,
> pdev = typec_match_altmode(port->partner_altmode, ALTMODE_DISCOVERY_MAX,
> PD_VDO_VID(p[0]), PD_VDO_OPOS(p[0]));
>
> + svdm_version = typec_get_negotiated_svdm_version(typec);
> + if (svdm_version < 0)
> + return 0;
> +
> switch (cmd_type) {
> case CMDT_INIT:
> switch (cmd) {
> @@ -1500,10 +1506,22 @@ 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]) < svdm_version)
> + typec_partner_set_svdm_version(port->partner,
> + 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_negotiated_svdm_version(typec) < SVDM_VER_2_0)
Why not
if (svdm_version)
?
> + 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 +1550,8 @@ 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_negotiated_svdm_version(typec)));
Unnecessary ( ) around VDO_SVDM_VERS. Also, why not svdm_version ?
> break;
> case CMDT_RSP_ACK:
> /* silently drop message if we are not connected */
> @@ -1542,19 +1562,22 @@ 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]) < svdm_version)
> + typec_partner_set_svdm_version(port->partner,
> + PD_VDO_SVDM_VER(p[0]));
> /* 6.4.4.3.1 */
> svdm_consume_identity(port, p, cnt);
> - response[0] = VDO(USB_SID_PD, 1, SVDM_VER_1_0, CMD_DISCOVER_SVID);
> + response[0] = VDO(USB_SID_PD, 1, typec_get_negotiated_svdm_version(typec),
Guess I am a bit confused about the use of svdm_version vs.
typec_get_negotiated_svdm_version(typec). Is there some rationale
for using one vs. the other ?
> + 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, SVDM_VER_1_0,
> - CMD_DISCOVER_SVID);
> + response[0] = VDO(USB_SID_PD, 1, svdm_version, CMD_DISCOVER_SVID);
> rlen = 1;
> } else if (modep->nsvids && supports_modal(port)) {
> - response[0] = VDO(modep->svids[0], 1, SVDM_VER_1_0,
> + response[0] = VDO(modep->svids[0], 1, svdm_version,
> CMD_DISCOVER_MODES);
> rlen = 1;
> }
> @@ -1565,7 +1588,7 @@ 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, SVDM_VER_1_0, CMD_DISCOVER_MODES);
> + response[0] = VDO(svid, 1, svdm_version, CMD_DISCOVER_MODES);
> rlen = 1;
> } else {
> tcpm_register_partner_altmodes(port);
> @@ -1592,6 +1615,8 @@ 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(svdm_version));
> break;
> }
> break;
> @@ -1611,6 +1636,8 @@ 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(svdm_version));
> break;
> }
> port->vdm_sm_running = false;
> @@ -1618,6 +1645,8 @@ 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(svdm_version));
> port->vdm_sm_running = false;
> break;
> }
> @@ -1695,7 +1724,13 @@ 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, SVDM_VER_1_0, CMD_EXIT_MODE);
> + int svdm_version = typec_get_negotiated_svdm_version(
> + port->typec_port);
> + if (svdm_version < 0)
> + break;
> +
> + response[0] = VDO(adev->svid, 1, svdm_version,
> + CMD_EXIT_MODE);
> response[0] |= VDO_OPOS(adev->mode);
> rlen = 1;
> }
> @@ -1722,14 +1757,19 @@ static void tcpm_handle_vdm_request(struct tcpm_port *port,
> static void tcpm_send_vdm(struct tcpm_port *port, u32 vid, int cmd,
> const u32 *data, int count)
> {
> + int svdm_version = typec_get_negotiated_svdm_version(port->typec_port);
> u32 header;
>
> + if (svdm_version < 0)
> + return;
> +
> if (WARN_ON(count > VDO_MAX_SIZE - 1))
> count = VDO_MAX_SIZE - 1;
>
> /* set VDM header with VID & CMD */
> header = VDO(vid, ((vid & USB_SID_PD) == USB_SID_PD) ?
> - 1 : (PD_VDO_CMD(cmd) <= CMD_ATTENTION), SVDM_VER_1_0, cmd);
> + 1 : (PD_VDO_CMD(cmd) <= CMD_ATTENTION),
> + svdm_version, cmd);
> tcpm_queue_vdm(port, header, data, count);
> }
>
> @@ -2022,9 +2062,14 @@ static int tcpm_validate_caps(struct tcpm_port *port, const u32 *pdo,
> static int tcpm_altmode_enter(struct typec_altmode *altmode, u32 *vdo)
> {
> struct tcpm_port *port = typec_altmode_get_drvdata(altmode);
> + int svdm_version;
> u32 header;
>
> - header = VDO(altmode->svid, vdo ? 2 : 1, SVDM_VER_1_0, CMD_ENTER_MODE);
> + svdm_version = typec_get_negotiated_svdm_version(port->typec_port);
> + if (svdm_version < 0)
> + return svdm_version;
> +
> + header = VDO(altmode->svid, vdo ? 2 : 1, svdm_version, CMD_ENTER_MODE);
> header |= VDO_OPOS(altmode->mode);
>
> tcpm_queue_vdm_unlocked(port, header, vdo, vdo ? 1 : 0);
> @@ -2034,9 +2079,14 @@ static int tcpm_altmode_enter(struct typec_altmode *altmode, u32 *vdo)
> static int tcpm_altmode_exit(struct typec_altmode *altmode)
> {
> struct tcpm_port *port = typec_altmode_get_drvdata(altmode);
> + int svdm_version;
> u32 header;
>
> - header = VDO(altmode->svid, 1, SVDM_VER_1_0, CMD_EXIT_MODE);
> + svdm_version = typec_get_negotiated_svdm_version(port->typec_port);
> + if (svdm_version < 0)
> + return svdm_version;
> +
> + header = VDO(altmode->svid, 1, svdm_version, CMD_EXIT_MODE);
> header |= VDO_OPOS(altmode->mode);
>
> tcpm_queue_vdm_unlocked(port, header, NULL, 0);
> @@ -5977,6 +6027,7 @@ 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
>
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