linux-kernel - Re: [PATCH v1] usb: typec: tcpm: Fix response to vsafe0V event

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Message-ID: <ZMeWKDi99T6tBRg8@kuha.fi.intel.com>
Date:   Mon, 31 Jul 2023 14:08:24 +0300
From:   Heikki Krogerus <heikki.krogerus@...ux.intel.com>
To:     Badhri Jagan Sridharan <badhri@...gle.com>
Cc:     gregkh@...uxfoundation.org, linux@...ck-us.net, kyletso@...gle.com,
        linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
        stable@...r.kernel.org
Subject: Re: [PATCH v1] usb: typec: tcpm: Fix response to vsafe0V event

Hi,

I'm sorry to keep you waiting.

On Wed, Jul 12, 2023 at 08:57:22AM +0000, Badhri Jagan Sridharan wrote:
> Do not transition to SNK_UNATTACHED state when receiving vsafe0v event
> while in SNK_HARD_RESET_WAIT_VBUS. Ignore VBUS off events as well as
> in some platforms VBUS off can be signalled more than once.
> 
> [143515.364753] Requesting mux state 1, usb-role 2, orientation 2
> [143515.365520] pending state change SNK_HARD_RESET_SINK_OFF -> SNK_HARD_RESET_SINK_ON @ 650 ms [rev3 HARD_RESET]
> [143515.632281] CC1: 0 -> 0, CC2: 3 -> 0 [state SNK_HARD_RESET_SINK_OFF, polarity 1, disconnected]
> [143515.637214] VBUS on
> [143515.664985] VBUS off
> [143515.664992] state change SNK_HARD_RESET_SINK_OFF -> SNK_HARD_RESET_WAIT_VBUS [rev3 HARD_RESET]
> [143515.665564] VBUS VSAFE0V
> [143515.665566] state change SNK_HARD_RESET_WAIT_VBUS -> SNK_UNATTACHED [rev3 HARD_RESET]
> 
> Fixes: 28b43d3d746b ("usb: typec: tcpm: Introduce vsafe0v for vbus")
> Cc: <stable@...r.kernel.org>
> Signed-off-by: Badhri Jagan Sridharan <badhri@...gle.com>

Acked-by: Heikki Krogerus <heikki.krogerus@...ux.intel.com>

> ---
>  drivers/usb/typec/tcpm/tcpm.c | 7 +++++++
>  1 file changed, 7 insertions(+)
> 
> diff --git a/drivers/usb/typec/tcpm/tcpm.c b/drivers/usb/typec/tcpm/tcpm.c
> index 829d75ebab42..cc1d83926497 100644
> --- a/drivers/usb/typec/tcpm/tcpm.c
> +++ b/drivers/usb/typec/tcpm/tcpm.c
> @@ -5349,6 +5349,10 @@ static void _tcpm_pd_vbus_off(struct tcpm_port *port)
>  		/* Do nothing, vbus drop expected */
>  		break;
>  
> +	case SNK_HARD_RESET_WAIT_VBUS:
> +		/* Do nothing, its OK to receive vbus off events */
> +		break;
> +
>  	default:
>  		if (port->pwr_role == TYPEC_SINK && port->attached)
>  			tcpm_set_state(port, SNK_UNATTACHED, tcpm_wait_for_discharge(port));
> @@ -5395,6 +5399,9 @@ static void _tcpm_pd_vbus_vsafe0v(struct tcpm_port *port)
>  	case SNK_DEBOUNCED:
>  		/*Do nothing, still waiting for VSAFE5V for connect */
>  		break;
> +	case SNK_HARD_RESET_WAIT_VBUS:
> +		/* Do nothing, its OK to receive vbus off events */
> +		break;
>  	default:
>  		if (port->pwr_role == TYPEC_SINK && port->auto_vbus_discharge_enabled)
>  			tcpm_set_state(port, SNK_UNATTACHED, 0);
> 
> base-commit: 06c2afb862f9da8dc5efa4b6076a0e48c3fbaaa5
> -- 
> 2.41.0.255.g8b1d071c50-goog

-- 
heikki