linux-kernel - Re: [PATCH v3 3/3] usb: typec: tcpm: charge current handling for sink during hard reset

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Date:   Fri, 12 Oct 2018 09:48:56 -0500
From:   Rob Herring <robh@...nel.org>
To:     Badhri Jagan Sridharan <badhri@...gle.com>
Cc:     Mark Rutland <mark.rutland@....com>,
        Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Chanwoo Choi <cw00.choi@...sung.com>,
        Andrzej Hajda <a.hajda@...sung.com>, Li Jun <jun.li@....com>,
        linux@...ck-us.net, jackp@...eaurora.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-usb@...r.kernel.org,
        Badhri Jagan Sridharan <badhri@...gle.com>
Subject: Re: [PATCH v3 3/3] usb: typec: tcpm: charge current handling for
 sink  during hard reset

On Mon,  1 Oct 2018 12:45:01 -0700, Badhri Jagan Sridharan wrote:
> During the initial connect to a non-pd port, sink would hard reset
> twice before deeming that the port partner is non-pd. TCPM sets the
> the charge path to false during the hard reset. This causes unnecessary
> connects/disconnects of charge path and makes port take longer to
> charge from the non-pd ports. Avoid this by not setting the charge path
> to false unless the partner has already identified to be pd capable.
> 
> When partner is a pd port, set the charge path to false in
> SNK_HARD_RESET_SINK_OFF. Set the current limits to default value based
> of CC pull up and resume the charge path when port enters
> SNK_HARD_RESET_SINK_ON.
> 
> Signed-off-by: Badhri Jagan Sridharan <badhri@...gle.com>
> 
> --------
> Changes in V3:
> Rebase on top of usb-next
> 
> Changes in V2:
> Based on feedback of jackp@...eaurora.org
> - vsafe_5v_hard_reset flag from tcpc_config is removed
> - Patch only differentiates between pd port partner and non-pd port
> partner
> 
> V1 version of the patch is here:
> https://lkml.org/lkml/2018/9/14/11
> ---
>  drivers/usb/typec/tcpm/tcpm.c | 9 ++++++++-
>  1 file changed, 8 insertions(+), 1 deletion(-)
> 

Reviewed-by: Rob Herring <robh@...nel.org>