linux-kernel - Re: [PATCH 2/5] USB: typec: tcpm: Hard Reset after not receiving a Request

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Date:   Thu, 10 Dec 2020 09:43:26 -0800
From:   Guenter Roeck <linux@...ck-us.net>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     heikki.krogerus@...ux.intel.com, linux-usb@...r.kernel.org,
        linux-kernel@...r.kernel.org, pumahsu <pumahsu@...gle.com>,
        Badhri Jagan Sridharan <badhri@...gle.com>,
        Kyle Tso <kyletso@...gle.com>,
        Will McVicker <willmcvicker@...gle.com>
Subject: Re: [PATCH 2/5] USB: typec: tcpm: Hard Reset after not receiving a
 Request

On Thu, Dec 10, 2020 at 05:05:18PM +0100, Greg Kroah-Hartman wrote:
> From: pumahsu <pumahsu@...gle.com>
> 
> PD 3.0 spec 8.3.3.2.3, A Get_Source_Cap message is sent
> to a UUT that is in the PE_SRC_Ready state. After sending
> a Source_Capabilities message, the UUT should then expect
> a Request message in response. When one is not received,
> the UUT should timeout to PE_SRC_Hard_Reset.
> 
> Cc: Guenter Roeck <linux@...ck-us.net>
> Cc: Heikki Krogerus <heikki.krogerus@...ux.intel.com>
> Cc: Badhri Jagan Sridharan <badhri@...gle.com>
> Signed-off-by: pumahsu <pumahsu@...gle.com>
> Signed-off-by: Kyle Tso <kyletso@...gle.com>
> Signed-off-by: Will McVicker <willmcvicker@...gle.com>
> Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

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

> ---
>  drivers/usb/typec/tcpm/tcpm.c | 12 +++++++++++-
>  1 file changed, 11 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/usb/typec/tcpm/tcpm.c b/drivers/usb/typec/tcpm/tcpm.c
> index 0ceeab50ed64..0efda59bb104 100644
> --- a/drivers/usb/typec/tcpm/tcpm.c
> +++ b/drivers/usb/typec/tcpm/tcpm.c
> @@ -2218,6 +2218,7 @@ static int tcpm_pd_send_control(struct tcpm_port *port,
>  static bool tcpm_send_queued_message(struct tcpm_port *port)
>  {
>  	enum pd_msg_request queued_message;
> +	int ret;
>  
>  	do {
>  		queued_message = port->queued_message;
> @@ -2237,7 +2238,16 @@ static bool tcpm_send_queued_message(struct tcpm_port *port)
>  			tcpm_pd_send_sink_caps(port);
>  			break;
>  		case PD_MSG_DATA_SOURCE_CAP:
> -			tcpm_pd_send_source_caps(port);
> +			ret = tcpm_pd_send_source_caps(port);
> +			if (ret < 0) {
> +				tcpm_log(port,
> +					 "Unable to send src caps, ret=%d",
> +					 ret);
> +				tcpm_set_state(port, SOFT_RESET_SEND, 0);
> +			} else if (port->pwr_role == TYPEC_SOURCE) {
> +				tcpm_set_state(port, HARD_RESET_SEND,
> +					       PD_T_SENDER_RESPONSE);
> +			}
>  			break;
>  		default:
>  			break;
> -- 
> 2.29.2
>