Hi Kyle,
The change doesn't seem to handle the cases where the partner does not
accept the request i.e.
"case PD_CTRL_REJECT:
case PD_CTRL_WAIT:
case PD_CTRL_NOT_SUPP:"
We should fall back to the disconnect threshold based on the
previously negotiated voltage levels in those cases.
Regards,
Badhri
On Sun, Jun 13, 2021 at 8:13 AM Kyle Tso <kyletso@xxxxxxxxxx> wrote:
>
> If the voltage is being decreased in power negotiation, the Source will
> set the power supply to operate at the new voltage level before sending
> PS_RDY. Relax the disconnect threshold for Sink after receiving Accept
> Message to ensure the relaxed setting is enabled before the voltage
> collapse. And the real threshold will be set after Sink receives PS_RDY
> Message.
>
> Fixes: f321a02caebd ("usb: typec: tcpm: Implement enabling Auto Discharge disconnect support")
> Cc: Badhri Jagan Sridharan <badhri@xxxxxxxxxx>
> Signed-off-by: Kyle Tso <kyletso@xxxxxxxxxx>
> ---
> drivers/usb/typec/tcpm/tcpm.c | 4 ++++
> 1 file changed, 4 insertions(+)
>
> diff --git a/drivers/usb/typec/tcpm/tcpm.c b/drivers/usb/typec/tcpm/tcpm.c
> index 0db685d5d9c0..9f3f37da71b6 100644
> --- a/drivers/usb/typec/tcpm/tcpm.c
> +++ b/drivers/usb/typec/tcpm/tcpm.c
> @@ -2646,6 +2646,8 @@ static void tcpm_pd_ctrl_request(struct tcpm_port *port,
> switch (port->state) {
> case SNK_NEGOTIATE_CAPABILITIES:
> port->pps_data.active = false;
> + /* Voltage is going to be at new level. Relax the threshold here. */
> + tcpm_set_auto_vbus_discharge_threshold(port, TYPEC_PWR_MODE_USB, false, 0);
> tcpm_set_state(port, SNK_TRANSITION_SINK, 0);
> break;
> case SNK_NEGOTIATE_PPS_CAPABILITIES:
> @@ -2656,6 +2658,8 @@ static void tcpm_pd_ctrl_request(struct tcpm_port *port,
> port->req_supply_voltage = port->pps_data.req_out_volt;
> port->req_current_limit = port->pps_data.req_op_curr;
> power_supply_changed(port->psy);
> + /* Voltage is going to be at new level. Relax the threshold here. */
> + tcpm_set_auto_vbus_discharge_threshold(port, TYPEC_PWR_MODE_USB, false, 0);
> tcpm_set_state(port, SNK_TRANSITION_SINK, 0);
> break;
> case SOFT_RESET_SEND:
> --
> 2.32.0.272.g935e593368-goog
>
