linux-kernel - Re: [PATCH 2/2] staging: typec: tcpm: explicit

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Date:   Tue, 15 Aug 2017 20:30:49 -0700
From:   Guenter Roeck <linux@...ck-us.net>
To:     Badhri Jagan Sridharan <badhri@...gle.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     devel@...verdev.osuosl.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] staging: typec: tcpm: explicit_contract is always
 established

On 08/15/2017 04:23 PM, Badhri Jagan Sridharan wrote:
> While in SNK_READY state, the explicit_contract seems to be
> set to true irrespective of whether an explicit contract
> was established for the current connection. TCPM also seems
> to report the pwr_opmode as TYPEC_PWR_MODE_PD always once
> the port gets into SNK_READY state. This isn't completely
> true as port gets into the SNK_READY state for non-pd
> type-c ports as well.
> 
> This patch sets the explicit_contract flag only when
> the PS_READY message is received and the vbus has been
> detected by the port controller.
> 
> Signed-off-by: Badhri Jagan Sridharan <Badhri@...gle.com>

Reviewed-by: Guenter Roeck <linux@...ck-us.net>

> ---
>   drivers/staging/typec/tcpm.c | 11 +++++++----
>   1 file changed, 7 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/staging/typec/tcpm.c b/drivers/staging/typec/tcpm.c
> index a24e6bbb909c..3e12cf101311 100644
> --- a/drivers/staging/typec/tcpm.c
> +++ b/drivers/staging/typec/tcpm.c
> @@ -1367,6 +1367,7 @@ static void tcpm_pd_ctrl_request(struct tcpm_port *port,
>   				tcpm_set_current_limit(port,
>   						       port->current_limit,
>   						       port->supply_voltage);
> +				port->explicit_contract = true;
>   				tcpm_set_state(port, SNK_READY, 0);
>   			} else {
>   				/*
> @@ -2458,10 +2459,11 @@ static void run_state_machine(struct tcpm_port *port)
>   		break;
>   	case SNK_READY:
>   		port->try_snk_count = 0;
> -		port->explicit_contract = true;
> -		typec_set_pwr_opmode(port->typec_port, TYPEC_PWR_MODE_PD);
> -		port->pwr_opmode = TYPEC_PWR_MODE_PD;
> -
> +		if (port->explicit_contract) {
> +			typec_set_pwr_opmode(port->typec_port,
> +					     TYPEC_PWR_MODE_PD);
> +			port->pwr_opmode = TYPEC_PWR_MODE_PD;
> +		}
>   		tcpm_typec_connect(port);
>   
>   		tcpm_check_send_discover(port);
> @@ -2951,6 +2953,7 @@ static void _tcpm_pd_vbus_on(struct tcpm_port *port)
>   	port->vbus_present = true;
>   	switch (port->state) {
>   	case SNK_TRANSITION_SINK_VBUS:
> +		port->explicit_contract = true;
>   		tcpm_set_state(port, SNK_READY, 0);
>   		break;
>   	case SNK_DISCOVERY:
>