Re: [PATCH] usb: typec: tcpm: reset counter when enter into unattached state after try role

[Guenter Roeck <linux@roeck-us.net>]

On Sun, Aug 20, 2023 at 11:15:18PM +0800, Xu Yang wrote:
> The try_src_count and try_snk_count may still be 1 after enter into
> unattached state. This may be caused by below case:
>  - SNK_TRY->SNK_TRY_WAIT->SRC_TRYWAIT->SNK_UNATTACHED
>  - SRC_TRY->SRC_TRY_WAIT->SNK_TRYWAIT->SNK_UNATTACHED
> 
> The port->attached is not true at the end and tcpm_reset_port() will not
> be called. This will reset counter into for these cases, otherwise the tcpm
> won't try role when new cable attached.
> 
> Signed-off-by: Xu Yang <xu.yang_2@nxp.com>

Reviewed-by: Guenter Roeck <linux@roeck-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 5639b9a1e0bf..c9a186a8c58c 100644
> --- a/drivers/usb/typec/tcpm/tcpm.c
> +++ b/drivers/usb/typec/tcpm/tcpm.c
> @@ -3719,6 +3719,9 @@ static void tcpm_detach(struct tcpm_port *port)
>  	if (tcpm_port_is_disconnected(port))
>  		port->hard_reset_count = 0;
>  
> +	port->try_src_count = 0;
> +	port->try_snk_count = 0;
> +
>  	if (!port->attached)
>  		return;
>  
> -- 
> 2.34.1
>