linux-kernel - Re: [PATCH v2 2/2] platform/chrome: cros_ec_typec: Avoid setting usb role during disconnect

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Message-ID: <20200730230238.GD3145664@google.com>
Date:   Thu, 30 Jul 2020 16:02:38 -0700
From:   Prashant Malani <pmalani@...omium.org>
To:     Azhar Shaikh <azhar.shaikh@...el.com>
Cc:     bleung@...omium.org, enric.balletbo@...labora.com,
        groeck@...omium.org, linux-kernel@...r.kernel.org,
        heikki.krogerus@...ux.intel.com, utkarsh.h.patel@...el.com,
        casey.g.bowman@...el.com, rajmohan.mani@...el.com
Subject: Re: [PATCH v2 2/2] platform/chrome: cros_ec_typec: Avoid setting usb
 role during disconnect

Hi Azhar,

On Thu, Jul 30, 2020 at 03:56:09PM -0700, Azhar Shaikh wrote:
> On disconnect port partner is removed and usb role is set to NONE.
> But then in cros_typec_port_update() the role is set again.
> Avoid this by moving usb_role_switch_set_role() to
> cros_typec_configure_mux().
> 
> Signed-off-by: Azhar Shaikh <azhar.shaikh@...el.com>
> Suggested-by: Prashant Malani <pmalani@...omium.org>
> ---
>  drivers/platform/chrome/cros_ec_typec.c | 10 +++++++---
>  1 file changed, 7 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/platform/chrome/cros_ec_typec.c b/drivers/platform/chrome/cros_ec_typec.c
> index eb4713b7ae14..df97431b2275 100644
> --- a/drivers/platform/chrome/cros_ec_typec.c
> +++ b/drivers/platform/chrome/cros_ec_typec.c
> @@ -515,6 +515,12 @@ static int cros_typec_configure_mux(struct cros_typec_data *typec, int port_num,
>  	if (ret)
>  		return ret;
>  
> +	ret = usb_role_switch_set_role(typec->ports[port_num]->role_sw,
> +				       pd_ctrl->role & PD_CTRL_RESP_ROLE_DATA
> +				       ? USB_ROLE_HOST : USB_ROLE_DEVICE);
> +	if (ret)
> +		return ret;

Since this was the last switch being configured, please maintain the
same order and add this at the end of the function, after the if-else if
block.

Best regards,

-Prashant