linux-kernel - Re: [PATCH] Revert "usb: typec: tcpm: reset counter when enter into unattached state after try role"

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Date: Mon, 26 Feb 2024 09:48:14 +0200
From: Heikki Krogerus <heikki.krogerus@...ux.intel.com>
To: Ondřej Jirman <megi@....cz>
Cc: linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	Guenter Roeck <linux@...ck-us.net>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Xu Yang <xu.yang_2@....com>,
	"open list:USB TYPEC PORT CONTROLLER DRIVERS" <linux-usb@...r.kernel.org>
Subject: Re: [PATCH] Revert "usb: typec: tcpm: reset counter when enter into
 unattached state after try role"

On Sat, Feb 17, 2024 at 05:20:21PM +0100, Ondřej Jirman wrote:
> From: Ondrej Jirman <megi@....cz>
> 
> The reverted commit makes the state machine only ever go from SRC_ATTACH_WAIT
> to SNK_TRY in endless loop when toggling. After revert it goes to SRC_ATTACHED
> after initially trying SNK_TRY earlier, as it should for toggling to ever detect
> the power source mode and the port is again able to provide power to attached
> power sinks.
> 
> This reverts commit 2d6d80127006ae3da26b1f21a65eccf957f2d1e5.
> 
> Cc: stable@...r.kernel.org
> Fixes: 2d6d80127006 ("usb: typec: tcpm: reset counter when enter into unattached state after try role")
> Signed-of-by: Ondrej Jirman <megi@....cz>

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

> ---
>  drivers/usb/typec/tcpm/tcpm.c | 3 ---
>  1 file changed, 3 deletions(-)
> 
> See https://lore.kernel.org/all/odggrbbgjpardze76qiv57mw6tllisyu5sbrta37iadjzwamcv@qr3ubwnlzqqt/
> for more.
> 
> diff --git a/drivers/usb/typec/tcpm/tcpm.c b/drivers/usb/typec/tcpm/tcpm.c
> index f7d7daa60c8d..295ae7eb912c 100644
> --- a/drivers/usb/typec/tcpm/tcpm.c
> +++ b/drivers/usb/typec/tcpm/tcpm.c
> @@ -3743,9 +3743,6 @@ static void tcpm_detach(struct tcpm_port *port)
>  	if (tcpm_port_is_disconnected(port))
>  		port->hard_reset_count = 0;
>  
> -	port->try_src_count = 0;
> -	port->try_snk_count = 0;
> -
>  	if (!port->attached)
>  		return;
>  
> -- 
> 2.43.0

-- 
heikki