linux-kernel - Re: [PATCH 8/8] platform/chrome: cros_ec_typec: Disable auto

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Message-ID: <vnemjw6uo3sydriabdrzwinbnam2xitrezrw3ztcymi63zakep@2rruplyjzuol>
Date: Wed, 25 Sep 2024 20:03:19 +0300
From: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To: Abhishek Pandit-Subedi <abhishekpandit@...omium.org>
Cc: heikki.krogerus@...ux.intel.com, tzungbi@...nel.org, jthies@...gle.com, 
	pmalani@...omium.org, akuchynski@...gle.com, Benson Leung <bleung@...omium.org>, 
	Guenter Roeck <groeck@...omium.org>, chrome-platform@...ts.linux.dev, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 8/8] platform/chrome: cros_ec_typec: Disable auto_enter

On Wed, Sep 25, 2024 at 09:25:09AM GMT, Abhishek Pandit-Subedi wrote:
> Altmodes with cros_ec are either automatically entered by the EC or
> entered by typecd in userspace so we should not auto enter from the
> kernel.

This makes policy decision for the whole platform. Consider somebody
running normal Linux distro on chromebooks. Can this be configured by
the userspace itself?

> 
> Signed-off-by: Abhishek Pandit-Subedi <abhishekpandit@...omium.org>
> ---
> 
>  drivers/platform/chrome/cros_ec_typec.c | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/drivers/platform/chrome/cros_ec_typec.c b/drivers/platform/chrome/cros_ec_typec.c
> index ec13d84d11b8..e06a0f2712ce 100644
> --- a/drivers/platform/chrome/cros_ec_typec.c
> +++ b/drivers/platform/chrome/cros_ec_typec.c
> @@ -294,6 +294,7 @@ static int cros_typec_register_port_altmodes(struct cros_typec_data *typec,
>  	desc.svid = USB_TYPEC_DP_SID;
>  	desc.mode = USB_TYPEC_DP_MODE;
>  	desc.vdo = DP_PORT_VDO;
> +	desc.no_auto_enter = true;
>  	amode = cros_typec_register_displayport(port, &desc,
>  						typec->ap_driven_altmode);
>  	if (IS_ERR(amode))
> @@ -314,6 +315,7 @@ static int cros_typec_register_port_altmodes(struct cros_typec_data *typec,
>  		memset(&desc, 0, sizeof(desc));
>  		desc.svid = USB_TYPEC_TBT_SID;
>  		desc.mode = TYPEC_ANY_MODE;
> +		desc.no_auto_enter = true;
>  		amode = cros_typec_register_thunderbolt(port, &desc);
>  		if (IS_ERR(amode))
>  			return PTR_ERR(amode);
> -- 
> 2.46.0.792.g87dc391469-goog
> 

-- 
With best wishes
Dmitry