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Date: Fri, 22 Mar 2024 12:04:14 +0200
From: Heikki Krogerus <heikki.krogerus@linux.intel.com>
To: "Christian A. Ehrhardt" <lk@c--e.de>
Cc: linux-kernel@vger.kernel.org,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	Prashant Malani <pmalani@chromium.org>,
	Jameson Thies <jthies@google.com>,
	Abhishek Pandit-Subedi <abhishekpandit@chromium.org>,
	Neil Armstrong <neil.armstrong@linaro.org>,
	Uwe =?iso-8859-1?Q?Kleine-K=F6nig?= <u.kleine-koenig@pengutronix.de>,
	Samuel =?utf-8?B?xIxhdm9q?= <samuel@cavoj.net>,
	linux-usb@vger.kernel.org, Kenneth Crudup <kenny@panix.com>
Subject: Re: [PATCH 3/5] usb: typec: ucsi: Ack unsupported commands
Message-ID: <Zf1XnmQlsQxpeK/Q@kuha.fi.intel.com>
References: <20240320073927.1641788-1-lk@c--e.de>
 <20240320073927.1641788-4-lk@c--e.de>
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On Wed, Mar 20, 2024 at 08:39:24AM +0100, Christian A. Ehrhardt wrote:
> If a command completes the OPM must send an ack. This applies
> to unsupported commands, too.
> 
> Send the required ACK for unsupported commands.
> 
> Signed-off-by: Christian A. Ehrhardt <lk@c--e.de>

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

> ---
>  drivers/usb/typec/ucsi/ucsi.c | 6 +++++-
>  1 file changed, 5 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/usb/typec/ucsi/ucsi.c b/drivers/usb/typec/ucsi/ucsi.c
> index dceeed207569..63f340dbd867 100644
> --- a/drivers/usb/typec/ucsi/ucsi.c
> +++ b/drivers/usb/typec/ucsi/ucsi.c
> @@ -151,8 +151,12 @@ static int ucsi_exec_command(struct ucsi *ucsi, u64 cmd)
>  	if (!(cci & UCSI_CCI_COMMAND_COMPLETE))
>  		return -EIO;
>  
> -	if (cci & UCSI_CCI_NOT_SUPPORTED)
> +	if (cci & UCSI_CCI_NOT_SUPPORTED) {
> +		if (ucsi_acknowledge_command(ucsi) < 0)
> +			dev_err(ucsi->dev,
> +				"ACK of unsupported command failed\n");
>  		return -EOPNOTSUPP;
> +	}
>  
>  	if (cci & UCSI_CCI_ERROR) {
>  		if (cmd == UCSI_GET_ERROR_STATUS)
> -- 
> 2.40.1

-- 
heikki