linux-kernel - Re: [PATCH 2/5] usb: typec: ucsi: Check for notifications after init

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Date: Fri, 22 Mar 2024 11:54:25 +0200
From: Heikki Krogerus <heikki.krogerus@...ux.intel.com>
To: "Christian A. Ehrhardt" <lk@...e.de>
Cc: linux-kernel@...r.kernel.org,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Prashant Malani <pmalani@...omium.org>,
	Jameson Thies <jthies@...gle.com>,
	Abhishek Pandit-Subedi <abhishekpandit@...omium.org>,
	Neil Armstrong <neil.armstrong@...aro.org>,
	Uwe Kleine-König <u.kleine-koenig@...gutronix.de>,
	Samuel Čavoj <samuel@...oj.net>,
	linux-usb@...r.kernel.org, Kenneth Crudup <kenny@...ix.com>
Subject: Re: [PATCH 2/5] usb: typec: ucsi: Check for notifications after init

On Wed, Mar 20, 2024 at 08:39:23AM +0100, Christian A. Ehrhardt wrote:
> The completion notification for the final SET_NOTIFICATION_ENABLE
> command during initialization can include a connector change
> notification.  However, at the time this completion notification is
> processed, the ucsi struct is not ready to handle this notification.
> As a result the notification is ignored and the controller
> never sends an interrupt again.
> 
> Re-check CCI for a pending connector state change after
> initialization is complete. Adjust the corresponding debug
> message accordingly.
> 
> Fixes: 71a1fa0df2a3 ("usb: typec: ucsi: Store the notification mask")
> Cc: stable@...r.kernel.org
> Signed-off-by: Christian A. Ehrhardt <lk@...e.de>

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

> ---
>  drivers/usb/typec/ucsi/ucsi.c | 10 +++++++++-
>  1 file changed, 9 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/usb/typec/ucsi/ucsi.c b/drivers/usb/typec/ucsi/ucsi.c
> index 8a6645ffd938..dceeed207569 100644
> --- a/drivers/usb/typec/ucsi/ucsi.c
> +++ b/drivers/usb/typec/ucsi/ucsi.c
> @@ -1237,7 +1237,7 @@ void ucsi_connector_change(struct ucsi *ucsi, u8 num)
>  	struct ucsi_connector *con = &ucsi->connector[num - 1];
>  
>  	if (!(ucsi->ntfy & UCSI_ENABLE_NTFY_CONNECTOR_CHANGE)) {
> -		dev_dbg(ucsi->dev, "Bogus connector change event\n");
> +		dev_dbg(ucsi->dev, "Early connector change event\n");
>  		return;
>  	}
>  
> @@ -1636,6 +1636,7 @@ static int ucsi_init(struct ucsi *ucsi)
>  {
>  	struct ucsi_connector *con, *connector;
>  	u64 command, ntfy;
> +	u32 cci;
>  	int ret;
>  	int i;
>  
> @@ -1688,6 +1689,13 @@ static int ucsi_init(struct ucsi *ucsi)
>  
>  	ucsi->connector = connector;
>  	ucsi->ntfy = ntfy;
> +
> +	ret = ucsi->ops->read(ucsi, UCSI_CCI, &cci, sizeof(cci));
> +	if (ret)
> +		return ret;
> +	if (UCSI_CCI_CONNECTOR(READ_ONCE(cci)))
> +		ucsi_connector_change(ucsi, cci);
> +
>  	return 0;
>  
>  err_unregister:
> -- 
> 2.40.1

-- 
heikki