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Date: Mon, 22 Apr 2024 15:41:03 +0300
From: Heikki Krogerus <heikki.krogerus@linux.intel.com>
To: Jameson Thies <jthies@google.com>
Cc: linux-usb@vger.kernel.org, pmalani@chromium.org, bleung@google.com,
	abhishekpandit@chromium.org, andersson@kernel.org,
	dmitry.baryshkov@linaro.org, fabrice.gasnier@foss.st.com,
	gregkh@linuxfoundation.org, hdegoede@redhat.com,
	neil.armstrong@linaro.org, rajaram.regupathy@intel.com,
	saranya.gopal@intel.com, linux-kernel@vger.kernel.org
Subject: Re: [PATCH v1 4/4] usb: typec: ucsi: Always set number of alternate
 modes
Message-ID: <ZiZa38zuzigPKnPe@kuha.fi.intel.com>
References: <20240419211650.2657096-1-jthies@google.com>
 <20240419211650.2657096-5-jthies@google.com>
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In-Reply-To: <20240419211650.2657096-5-jthies@google.com>

On Fri, Apr 19, 2024 at 09:16:50PM +0000, Jameson Thies wrote:
> Providing the number of known alternate modes allows user space to
> determine when device registration has completed. Always register a
> number of known alternate modes for the partner and cable plug, even
> when the number of supported alternate modes is 0.
> 
> Signed-off-by: Jameson Thies <jthies@google.com>

Reviewed-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>

> ---
>  drivers/usb/typec/ucsi/ucsi.c | 14 +++++++++++---
>  1 file changed, 11 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/usb/typec/ucsi/ucsi.c b/drivers/usb/typec/ucsi/ucsi.c
> index cd4c3b7a5d989..ea76d42fd1504 100644
> --- a/drivers/usb/typec/ucsi/ucsi.c
> +++ b/drivers/usb/typec/ucsi/ucsi.c
> @@ -812,10 +812,11 @@ static int ucsi_check_altmodes(struct ucsi_connector *con)
>  	/* Ignoring the errors in this case. */
>  	if (con->partner_altmode[0]) {
>  		num_partner_am = ucsi_get_num_altmode(con->partner_altmode);
> -		if (num_partner_am > 0)
> -			typec_partner_set_num_altmodes(con->partner, num_partner_am);
> +		typec_partner_set_num_altmodes(con->partner, num_partner_am);
>  		ucsi_altmode_update_active(con);
>  		return 0;
> +	} else {
> +		typec_partner_set_num_altmodes(con->partner, 0);
>  	}
>  
>  	return ret;
> @@ -1138,7 +1139,7 @@ static int ucsi_check_connection(struct ucsi_connector *con)
>  static int ucsi_check_cable(struct ucsi_connector *con)
>  {
>  	u64 command;
> -	int ret;
> +	int ret, num_plug_am;
>  
>  	if (con->cable)
>  		return 0;
> @@ -1172,6 +1173,13 @@ static int ucsi_check_cable(struct ucsi_connector *con)
>  			return ret;
>  	}
>  
> +	if (con->plug_altmode[0]) {
> +		num_plug_am = ucsi_get_num_altmode(con->plug_altmode);
> +		typec_plug_set_num_altmodes(con->plug, num_plug_am);
> +	} else {
> +		typec_plug_set_num_altmodes(con->plug, 0);
> +	}
> +
>  	return 0;
>  }
>  
> -- 
> 2.44.0.769.g3c40516874-goog

-- 
heikki