linux-kernel - Re: [PATCH] usb: typec: tcpm: Keep other events when receiving FRS and Sourcing

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Date:   Tue, 3 Aug 2021 06:48:51 -0700
From:   Guenter Roeck <linux@...ck-us.net>
To:     Kyle Tso <kyletso@...gle.com>, heikki.krogerus@...ux.intel.com,
        gregkh@...uxfoundation.org
Cc:     badhri@...gle.com, linux-usb@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] usb: typec: tcpm: Keep other events when receiving FRS
 and Sourcing_vbus events

On 8/3/21 2:13 AM, Kyle Tso wrote:
> When receiving FRS and Sourcing_Vbus events from low-level drivers, keep
> other events which come a bit earlier so that they will not be ignored
> in the event handler.
> 
> Fixes: 8dc4bd073663 ("usb: typec: tcpm: Add support for Sink Fast Role SWAP(FRS)")
> Cc: Badhri Jagan Sridharan <badhri@...gle.com>
> Signed-off-by: Kyle Tso <kyletso@...gle.com>

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

> ---
>   drivers/usb/typec/tcpm/tcpm.c | 4 ++--
>   1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/usb/typec/tcpm/tcpm.c b/drivers/usb/typec/tcpm/tcpm.c
> index 5b22a1c931a9..b9bb63d749ec 100644
> --- a/drivers/usb/typec/tcpm/tcpm.c
> +++ b/drivers/usb/typec/tcpm/tcpm.c
> @@ -5369,7 +5369,7 @@ EXPORT_SYMBOL_GPL(tcpm_pd_hard_reset);
>   void tcpm_sink_frs(struct tcpm_port *port)
>   {
>   	spin_lock(&port->pd_event_lock);
> -	port->pd_events = TCPM_FRS_EVENT;
> +	port->pd_events |= TCPM_FRS_EVENT;
>   	spin_unlock(&port->pd_event_lock);
>   	kthread_queue_work(port->wq, &port->event_work);
>   }
> @@ -5378,7 +5378,7 @@ EXPORT_SYMBOL_GPL(tcpm_sink_frs);
>   void tcpm_sourcing_vbus(struct tcpm_port *port)
>   {
>   	spin_lock(&port->pd_event_lock);
> -	port->pd_events = TCPM_SOURCING_VBUS;
> +	port->pd_events |= TCPM_SOURCING_VBUS;
>   	spin_unlock(&port->pd_event_lock);
>   	kthread_queue_work(port->wq, &port->event_work);
>   }
>