linux-kernel - Re: [PATCH 2/2] usb: typec: tcpm: Respond Not_Supported if no snk

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Date:   Fri, 21 May 2021 07:48:46 -0700
From:   Guenter Roeck <linux@...ck-us.net>
To:     Kyle Tso <kyletso@...gle.com>, heikki.krogerus@...ux.intel.com,
        gregkh@...uxfoundation.org
Cc:     badhri@...gle.com, linux-usb@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] usb: typec: tcpm: Respond Not_Supported if no snk_vdo

On 5/21/21 6:01 AM, Kyle Tso wrote:
> If snk_vdo is not populated from fwnode, it implies the port does not
> support responding to SVDM commands. Not_Supported Message shall be sent
> if the contract is in PD3. And for PD2, the port shall ignore the
> commands.
> 
> Fixes: 193a68011fdc ("staging: typec: tcpm: Respond to Discover Identity commands")
> Signed-off-by: Kyle Tso <kyletso@...gle.com>

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

> ---
>   drivers/usb/typec/tcpm/tcpm.c | 5 ++++-
>   1 file changed, 4 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/usb/typec/tcpm/tcpm.c b/drivers/usb/typec/tcpm/tcpm.c
> index deb8a9d01f73..d32caa875d9a 100644
> --- a/drivers/usb/typec/tcpm/tcpm.c
> +++ b/drivers/usb/typec/tcpm/tcpm.c
> @@ -2430,7 +2430,10 @@ static void tcpm_pd_data_request(struct tcpm_port *port,
>   					   NONE_AMS);
>   		break;
>   	case PD_DATA_VENDOR_DEF:
> -		tcpm_handle_vdm_request(port, msg->payload, cnt);
> +		if (tcpm_vdm_ams(port) || port->nr_snk_vdo)
> +			tcpm_handle_vdm_request(port, msg->payload, cnt);
> +		else if (port->negotiated_rev > PD_REV20)
> +			tcpm_pd_handle_msg(port, PD_MSG_CTRL_NOT_SUPP, NONE_AMS);
>   		break;
>   	case PD_DATA_BIST:
>   		port->bist_request = le32_to_cpu(msg->payload[0]);
>