Re: [PATCH 1/4] usb: typec: tcpm: fix cc role at port reset

Heikki Krogerus
2023-03-14T09:21:01Z

On Mon, Mar 13, 2023 at 10:58:40AM +0800, Frank Wang wrote:
> In the current implementation, the tcpm set CC1/CC2 role to open when
> it do port reset would cause the VBUS removed by the Type-C partner.
>
> The Figure 4-20 in the TCPCI 2.0 specification show that the CC1/CC2
> role should set to 01b (Rp) or 10b (Rd) at Power On or Reset stage
> in DRP initialization and connection detection.
>
> So set CC1/CC2 to Rd to fix it.
>
> Signed-off-by: Frank Wang <frank.wang@rock-chips.com>
> ---
> drivers/usb/typec/tcpm/tcpm.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/usb/typec/tcpm/tcpm.c b/drivers/usb/typec/tcpm/tcpm.c
> index a0d943d785800..66de02a56f512 100644
> --- a/drivers/usb/typec/tcpm/tcpm.c
> +++ b/drivers/usb/typec/tcpm/tcpm.c
> @@ -4851,7 +4851,7 @@ static void run_state_machine(struct tcpm_port *port)
> break;
> case PORT_RESET:
> tcpm_reset_port(port);
> - tcpm_set_cc(port, TYPEC_CC_OPEN);
> + tcpm_set_cc(port, TYPEC_CC_RD);
> tcpm_set_state(port, PORT_RESET_WAIT_OFF,
> PD_T_ERROR_RECOVERY);
> break;

Will this work if the port is for example source only?

thanks,

--
heikki