android/android_kernel_samsung_sm8650
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

UPSTREAM: usb: typec: tcpm: set initial svdm version based on pd revision

Browse Source 
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: c34e85fa69 ("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>

Bug: 289437937
(cherry picked from commit c97cd0b4b54eb42aed7f6c3c295a2d137f6d2416)
Signed-off-by: RD Babiera <rdbabiera@google.com>
(cherry picked from https://android-review.googlesource.com/q/commit:d02aef1ae51a03b9ab20c8e01ed32593a7ffc6fc)
Merged-In: Ie919c29bab68cb08cb659471ff6106bae502c8dd
Change-Id: Ie919c29bab68cb08cb659471ff6106bae502c8dd
This commit is contained in:
RD Babiera 2023-09-05 22:14:40 +00:00 committed by Treehugger Robot
parent a68bd01493
commit 68eefde2d3
1 changed files with 31 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

35
drivers/usb/typec/tcpm/tcpm.c
View File

@ -3853,6 +3853,29 @@ 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;
@ -4097,10 +4120,12 @@ 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
@ -4403,10 +4428,12 @@ 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;