linux-kernel - Re: [PATCH v2 3/7] usb: typec: Auto enter control for alternate modes

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Message-ID: <ZyOVIKGlrlj7kc9-@kuha.fi.intel.com>
Date: Thu, 31 Oct 2024 16:33:04 +0200
From: Heikki Krogerus <heikki.krogerus@...ux.intel.com>
To: Abhishek Pandit-Subedi <abhishekpandit@...omium.org>
Cc: tzungbi@...nel.org, linux-usb@...r.kernel.org,
	chrome-platform@...ts.linux.dev, dmitry.baryshkov@...aro.org,
	jthies@...gle.com, akuchynski@...gle.com, pmalani@...omium.org,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 3/7] usb: typec: Auto enter control for alternate modes

On Wed, Oct 30, 2024 at 02:28:34PM -0700, Abhishek Pandit-Subedi wrote:
> Add controls for whether an alternate mode is automatically entered when
> a partner connects. The auto_enter control is only available on ports
> and applies immediately after a partner connects. The default behavior
> is to enable auto enter and drivers must explicitly disable it.
> 
> Signed-off-by: Abhishek Pandit-Subedi <abhishekpandit@...omium.org>
> ---
> 
> (no changes since v1)
> 
>  Documentation/ABI/testing/sysfs-bus-typec |  9 +++++++
>  drivers/usb/typec/altmodes/displayport.c  |  6 +++--
>  drivers/usb/typec/altmodes/thunderbolt.c  |  3 ++-
>  drivers/usb/typec/class.c                 | 31 +++++++++++++++++++++++
>  include/linux/usb/typec.h                 |  2 ++
>  include/linux/usb/typec_altmode.h         |  2 ++
>  6 files changed, 50 insertions(+), 3 deletions(-)
> 
> diff --git a/Documentation/ABI/testing/sysfs-bus-typec b/Documentation/ABI/testing/sysfs-bus-typec
> index 205d9c91e2e1..f09d05727b82 100644
> --- a/Documentation/ABI/testing/sysfs-bus-typec
> +++ b/Documentation/ABI/testing/sysfs-bus-typec
> @@ -12,6 +12,15 @@ Description:
>  
>  		Valid values are boolean.
>  
> +What:		/sys/bus/typec/devices/.../auto_enter
> +Date:		September 2024
> +Contact:	Heikki Krogerus <heikki.krogerus@...ux.intel.com>
> +Description:
> +		Controls whether a mode will be automatically entered when a partner is
> +		connected.
> +
> +		This field is only valid and displayed on a port. Valid values are boolean.

So, why can't this be controlled with the "active" property of the
port altmode instead? That's why it's there.

Sorry if I missed something in v1 related to this question.

thanks,

-- 
heikki