Re: [PATCH v1] usb: typec: tcpm: Ignore CC and vbus changes in PORT_RESET change

From: Heikki Krogerus
Date: Tue Apr 14 2020 - 08:04:22 EST


On Thu, Apr 02, 2020 at 02:59:47PM -0700, Badhri Jagan Sridharan wrote:
> After PORT_RESET, the port is set to the appropriate
> default_state. Ignore processing CC changes here as this
> could cause the port to be switched into sink states
> by default.
>
> echo source > /sys/class/typec/port0/port_type
>
> Before:
> [ 154.528547] pending state change PORT_RESET -> PORT_RESET_WAIT_OFF @ 100 ms
> [ 154.528560] CC1: 0 -> 0, CC2: 3 -> 0 [state PORT_RESET, polarity 0, disconnected]
> [ 154.528564] state change PORT_RESET -> SNK_UNATTACHED
>
> After:
> [ 151.068814] pending state change PORT_RESET -> PORT_RESET_WAIT_OFF @ 100 ms [rev3 NONE_AMS]
> [ 151.072440] CC1: 3 -> 0, CC2: 0 -> 0 [state PORT_RESET, polarity 0, disconnected]
> [ 151.172117] state change PORT_RESET -> PORT_RESET_WAIT_OFF [delayed 100 ms]
> [ 151.172136] pending state change PORT_RESET_WAIT_OFF -> SRC_UNATTACHED @ 870 ms [rev3 NONE_AMS]
> [ 152.060106] state change PORT_RESET_WAIT_OFF -> SRC_UNATTACHED [delayed 870 ms]
> [ 152.060118] Start toggling

Guenter, can you take a look at this?

> Signed-off-by: Badhri Jagan Sridharan <badhri@xxxxxxxxxx>
> ---
> drivers/usb/typec/tcpm/tcpm.c | 26 ++++++++++++++++++++++++++
> 1 file changed, 26 insertions(+)
>
> diff --git a/drivers/usb/typec/tcpm/tcpm.c b/drivers/usb/typec/tcpm/tcpm.c
> index de3576e6530ab2..82b19ebd7838e0 100644
> --- a/drivers/usb/typec/tcpm/tcpm.c
> +++ b/drivers/usb/typec/tcpm/tcpm.c
> @@ -3794,6 +3794,14 @@ static void _tcpm_cc_change(struct tcpm_port *port, enum typec_cc_status cc1,
> */
> break;
>
> + case PORT_RESET:
> + case PORT_RESET_WAIT_OFF:
> + /*
> + * State set back to default mode once the timer completes.
> + * Ignore CC changes here.
> + */
> + break;
> +
> default:
> if (tcpm_port_is_disconnected(port))
> tcpm_set_state(port, unattached_state(port), 0);
> @@ -3855,6 +3863,15 @@ static void _tcpm_pd_vbus_on(struct tcpm_port *port)
> case SRC_TRY_DEBOUNCE:
> /* Do nothing, waiting for sink detection */
> break;
> +
> + case PORT_RESET:
> + case PORT_RESET_WAIT_OFF:
> + /*
> + * State set back to default mode once the timer completes.
> + * Ignore vbus changes here.
> + */
> + break;
> +
> default:
> break;
> }
> @@ -3908,10 +3925,19 @@ static void _tcpm_pd_vbus_off(struct tcpm_port *port)
> case PORT_RESET_WAIT_OFF:
> tcpm_set_state(port, tcpm_default_state(port), 0);
> break;
> +
> case SRC_TRY_WAIT:
> case SRC_TRY_DEBOUNCE:
> /* Do nothing, waiting for sink detection */
> break;
> +
> + case PORT_RESET:
> + /*
> + * State set back to default mode once the timer completes.
> + * Ignore vbus changes here.
> + */
> + break;
> +
> default:
> if (port->pwr_role == TYPEC_SINK &&
> port->attached)
> --
> 2.26.0.292.g33ef6b2f38-goog

thanks,

--
heikki