linux-kernel - Re: [PATCH RFC] usb: typec: ucsi: Set orientation as none when connector is unplugged

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Message-ID: <ZxfTzrEpCG7NITq4@hovoldconsulting.com>
Date: Tue, 22 Oct 2024 18:33:18 +0200
From: Johan Hovold <johan@...nel.org>
To: Abel Vesa <abel.vesa@...aro.org>
Cc: Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Bjorn Andersson <andersson@...nel.org>,
	Konrad Dybcio <konradybcio@...nel.org>,
	Neil Armstrong <neil.armstrong@...aro.org>,
	Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
	linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-arm-msm@...r.kernel.org
Subject: Re: [PATCH RFC] usb: typec: ucsi: Set orientation as none when
 connector is unplugged

On Thu, Oct 17, 2024 at 07:01:01PM +0300, Abel Vesa wrote:
> Currently, the ucsi glink client is only reporting orientation normal or
> reversed, based on the level of the gpio. On unplug, it defaults to
> orientation normal instead of none. This confuses some of the orientation
> switches drivers as they might rely on orientation none in order to
> configure the HW in some sort of safe mode.

Can you be more specific here (e.g. so that reviewers and backporter can
determine whether this is a fix that should be backported to stable)?

Which driver is confused? How does this manifest itself?

Is this an issue today? Or something you need for future work, etc?

> So propagate the orientation
> none instead when the connector status flags says cable is disconnected.
> 
> Signed-off-by: Abel Vesa <abel.vesa@...aro.org>
> ---
>  drivers/usb/typec/ucsi/ucsi_glink.c | 5 +++++
>  1 file changed, 5 insertions(+)
> 
> diff --git a/drivers/usb/typec/ucsi/ucsi_glink.c b/drivers/usb/typec/ucsi/ucsi_glink.c
> index 3e4d88ab338e50d4265df15fc960907c36675282..b3bc02e4b0427a894c5b5df470af47433145243e 100644
> --- a/drivers/usb/typec/ucsi/ucsi_glink.c
> +++ b/drivers/usb/typec/ucsi/ucsi_glink.c
> @@ -185,6 +185,11 @@ static void pmic_glink_ucsi_connector_status(struct ucsi_connector *con)
>  	struct pmic_glink_ucsi *ucsi = ucsi_get_drvdata(con->ucsi);
>  	int orientation;
>  
> +	if (!(con->status.flags & UCSI_CONSTAT_CONNECTED)) {
> +		typec_set_orientation(con->port, TYPEC_ORIENTATION_NONE);
> +		return;
> +	}
> +
>  	if (con->num >= PMIC_GLINK_MAX_PORTS ||
>  	    !ucsi->port_orientation[con->num - 1])
>  		return;

Johan