Re: [PATCH v1] usb: typec: tcpm: Handle vbus shutoff when in source mode

From: Guenter Roeck
Date: Mon Feb 01 2021 - 09:39:42 EST


On 2/1/21 2:02 AM, Badhri Jagan Sridharan wrote:
> While in source mode, vbus could be shutoff by protections
> circuits. TCPM does not move back to toggling state to
> re-initiate connection. Fix this by moving to SRC_UNATTACHED
> state when vbus shuts off while in source mode.
>
> Signed-off-by: Badhri Jagan Sridharan <badhri@xxxxxxxxxx>

Reviewed-by: Guenter Roeck <linux@xxxxxxxxxxxx>

> ---
> drivers/usb/typec/tcpm/tcpm.c | 11 +++++++++++
> 1 file changed, 11 insertions(+)
>
> diff --git a/drivers/usb/typec/tcpm/tcpm.c b/drivers/usb/typec/tcpm/tcpm.c
> index 0afd8ef692e8..ff0732c12b8a 100644
> --- a/drivers/usb/typec/tcpm/tcpm.c
> +++ b/drivers/usb/typec/tcpm/tcpm.c
> @@ -4897,6 +4897,17 @@ static void _tcpm_pd_vbus_off(struct tcpm_port *port)
> /* Do nothing, waiting for sink detection */
> break;
>
> + case SRC_STARTUP:
> + case SRC_SEND_CAPABILITIES:
> + case SRC_SEND_CAPABILITIES_TIMEOUT:
> + case SRC_NEGOTIATE_CAPABILITIES:
> + case SRC_TRANSITION_SUPPLY:
> + case SRC_READY:
> + case SRC_WAIT_NEW_CAPABILITIES:
> + /* Force to unattached state to re-initiate connection */
> + tcpm_set_state(port, SRC_UNATTACHED, 0);
> + break;
> +
> case PORT_RESET:
> /*
> * State set back to default mode once the timer completes.
>