linux-kernel - Re: [PATCH v1 1/4] usb: typec: tcpm: Fix up PR

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Message-ID: <20210517143246.GA3434992@roeck-us.net>
Date:   Mon, 17 May 2021 07:32:46 -0700
From:   Guenter Roeck <linux@...ck-us.net>
To:     Badhri Jagan Sridharan <badhri@...gle.com>
Cc:     Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
        Kyle Tso <kyletso@...gle.com>, stable@...r.kernel.org
Subject: Re: [PATCH v1 1/4] usb: typec: tcpm: Fix up PR_SWAP when vsafe0v is
 signalled

On Fri, May 14, 2021 at 10:26:10PM -0700, Badhri Jagan Sridharan wrote:
> During PR_SWAP, When TCPM is in PR_SWAP_SNK_SRC_SINK_OFF, vbus is
> expected to reach VSAFE0V when source turns of vbus. Do not move

s/of/off/ as already reported

> to SNK_UNATTACHED state when this happens.
> 
> Fixes: 28b43d3d746b ("usb: typec: tcpm: Introduce vsafe0v for vbus")
> Signed-off-by: Badhri Jagan Sridharan <badhri@...gle.com>

Otherwise

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

> ---
>  drivers/usb/typec/tcpm/tcpm.c | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/drivers/usb/typec/tcpm/tcpm.c b/drivers/usb/typec/tcpm/tcpm.c
> index c4fdc00a3bc8..b93c4c8d7b15 100644
> --- a/drivers/usb/typec/tcpm/tcpm.c
> +++ b/drivers/usb/typec/tcpm/tcpm.c
> @@ -5114,6 +5114,9 @@ static void _tcpm_pd_vbus_vsafe0v(struct tcpm_port *port)
>  				tcpm_set_state(port, SNK_UNATTACHED, 0);
>  		}
>  		break;
> +	case PR_SWAP_SNK_SRC_SINK_OFF:
> +		/* Do nothing, vsafe0v is expected during transition */
> +		break;
>  	default:
>  		if (port->pwr_role == TYPEC_SINK && port->auto_vbus_discharge_enabled)
>  			tcpm_set_state(port, SNK_UNATTACHED, 0);
> -- 
> 2.31.1.751.gd2f1c929bd-goog
>