Hi,

I'm sorry to keep you waiting.

On Wed, Jul 26, 2023 at 02:08:07AM +0000, RD Babiera wrote:

When sending Discover Identity messages to a Port Partner that uses Power Delivery v2 and SVDM v1, we currently send PD v2 messages with SVDM v2.0, expecting the port partner to respond with its highest supported SVDM version as stated in Section 6.4.4.2.3 in the Power Delivery v3 specification. However, sending SVDM v2 to some Power Delivery v2 port partners results in a NAK whereas sending SVDM v1 does not.

NAK messages can be handled by the initiator (PD v3 section 6.4.4.2.5.1), and one solution could be to resend Discover Identity on a lower SVDM version if possible. But, Section 6.4.4.3 of PD v2 states that "A NAK response Should be taken as an indication not to retry that particular Command."

Instead, we can set the SVDM version to the maximum one supported by the negotiated PD revision. When operating in PD v2, this obeys Section 6.4.4.2.3, which states the SVDM field "Shall be set to zero to indicate Version 1.0." In PD v3, the SVDM field "Shall be set to 01b to indicate Version 2.0."

This makes sense to me, but couple of nitpicks below.

Fixes: c34e85fa69b9 ("usb: typec: tcpm: Send DISCOVER_IDENTITY from dedicated work") Cc: stable@vger.kernel.org Signed-off-by: RD Babiera rdbabiera@google.com

---

drivers/usb/typec/tcpm/tcpm.c | 35 +++++++++++++++++++++++++++++++---- 1 file changed, 31 insertions(+), 4 deletions(-)

diff --git a/drivers/usb/typec/tcpm/tcpm.c b/drivers/usb/typec/tcpm/tcpm.c index 829d75ebab42..5b0a428fcf5d 100644 --- a/drivers/usb/typec/tcpm/tcpm.c +++ b/drivers/usb/typec/tcpm/tcpm.c @@ -3928,6 +3928,31 @@ static enum typec_cc_status tcpm_pwr_opmode_to_rp(enum typec_pwr_opmode opmode) } } +static void tcpm_set_initial_svdm_version(struct tcpm_port *port) +{

• switch (port->negotiated_rev) {
• case PD_REV30:

• break;
  

• /*

• * 6.4.4.2.3 Structured VDM Version
  

• * 2.0 states "At this time, there is only one version (1.0) defined.
  

• * This field Shall be set to zero to indicate Version 1.0."
  

• * 3.0 states "This field Shall be set to 01b to indicate Version 2.0."
  

• * To ensure that we follow the Power Delivery revision we are currently
  

• * operating on, downgrade the SVDM version to the highest one supported
  

• * by the Power Delivery revision.
  

• */
  

• case PD_REV20:

• typec_partner_set_svdm_version(port->partner,
  

• 			       SVDM_VER_1_0);
  

One line is enough.

• break;
  

• default:

• typec_partner_set_svdm_version(port->partner,
  

• 			       SVDM_VER_1_0);
  

Ditto.

• break;
  

• }

+}

static void run_state_machine(struct tcpm_port *port) { int ret; @@ -4165,9 +4190,10 @@ static void run_state_machine(struct tcpm_port *port) * For now, this driver only supports SOP for DISCOVER_IDENTITY, thus using * port->explicit_contract to decide whether to send the command. */

• if (port->explicit_contract)
  

• if (port->explicit_contract) {
  

• 	tcpm_set_initial_svdm_version(port);
  mod_send_discover_delayed_work(port, 0);
  

• else
  

• } else
  port->send_discover = false;
  

The else statement needs to be wrapped in curly brackets in this case since the if statement had them.

/*

@@ -4455,9 +4481,10 @@ static void run_state_machine(struct tcpm_port *port) * For now, this driver only supports SOP for DISCOVER_IDENTITY, thus using * port->explicit_contract. */

• if (port->explicit_contract)
  

• if (port->explicit_contract) {
  

• 	tcpm_set_initial_svdm_version(port);
  mod_send_discover_delayed_work(port, 0);
  

• else
  

• } else
  port->send_discover = false;
  

Ditto.

thanks,