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authorRD Babiera <rdbabiera@google.com>2023-07-31 19:59:23 +0300
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2023-08-23 12:10:53 +0300
commitc97cd0b4b54eb42aed7f6c3c295a2d137f6d2416 (patch)
treea9b3a14fba117325152d3dd66f18ef0d649c6757 /drivers/usb
parente16d5f1447e0fae6cbcd1d430b20f87b65f25307 (diff)
downloadlinux-c97cd0b4b54eb42aed7f6c3c295a2d137f6d2416.tar.xz
usb: typec: tcpm: set initial svdm version based on pd revision
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." Fixes: c34e85fa69b9 ("usb: typec: tcpm: Send DISCOVER_IDENTITY from dedicated work") Cc: stable@vger.kernel.org Signed-off-by: RD Babiera <rdbabiera@google.com> Reviewed-by: Heikki Krogerus <heikki.krogerus@linux.intel.com> Link: https://lore.kernel.org/r/20230731165926.1815338-1-rdbabiera@google.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/usb')
-rw-r--r--drivers/usb/typec/tcpm/tcpm.c35
1 files changed, 31 insertions, 4 deletions
diff --git a/drivers/usb/typec/tcpm/tcpm.c b/drivers/usb/typec/tcpm/tcpm.c
index ab7e3d7249ab..df728a066c58 100644
--- a/drivers/usb/typec/tcpm/tcpm.c
+++ b/drivers/usb/typec/tcpm/tcpm.c
@@ -3859,6 +3859,29 @@ 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);
+ break;
+ default:
+ typec_partner_set_svdm_version(port->partner, SVDM_VER_1_0);
+ break;
+ }
+}
+
static void run_state_machine(struct tcpm_port *port)
{
int ret;
@@ -4096,10 +4119,12 @@ 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;
+ }
/*
* 6.3.5
@@ -4388,10 +4413,12 @@ 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;
+ }
power_supply_changed(port->psy);
break;