linux-kernel - Re: [PATCH 1/2] platform/chrome: cros_ec_proto: Update cros_ec_cmd

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Date:   Mon, 7 Sep 2020 12:48:14 +0200
From:   Enric Balletbo i Serra <enric.balletbo@...labora.com>
To:     Prashant Malani <pmalani@...omium.org>,
        linux-kernel@...r.kernel.org
Cc:     gwendal@...omium.org, Benson Leung <bleung@...omium.org>,
        Guenter Roeck <groeck@...omium.org>
Subject: Re: [PATCH 1/2] platform/chrome: cros_ec_proto: Update
 cros_ec_cmd_xfer() call-sites

Hi Prashant,

Thank you for your patch.

On 3/9/20 11:54, Prashant Malani wrote:
> Since all the other call-sites of cros_ec_cmd_xfer() have been converted
> to use cros_ec_cmd_xfer_status() instead, update the remaining
> call-sites to prepare for the merge of cros_ec_cmd_xfer() into
> cros_ec_cmd_xfer_status().
> 
> As part of this update, change the error handling inside
> cros_ec_get_sensor_count() such that the legacy LPC interface is tried
> on all error values, not just when msg->result != EC_RESULT_SUCCESS.
> 
> Signed-off-by: Prashant Malani <pmalani@...omium.org>

Gwendal, I'd like to hear from you regarding this patch as you're the one that
know most about the corner cases for the sensors in different hardware. Could
you take a look and give us your Reviewed tag if all is good?

Thanks,

 Enric

> ---
>  drivers/platform/chrome/cros_ec_proto.c | 15 ++++-----------
>  1 file changed, 4 insertions(+), 11 deletions(-)
> 
> diff --git a/drivers/platform/chrome/cros_ec_proto.c b/drivers/platform/chrome/cros_ec_proto.c
> index dda182132a6a..2cb1defcdd13 100644
> --- a/drivers/platform/chrome/cros_ec_proto.c
> +++ b/drivers/platform/chrome/cros_ec_proto.c
> @@ -650,7 +650,7 @@ static int get_next_event_xfer(struct cros_ec_device *ec_dev,
>  	msg->insize = size;
>  	msg->outsize = 0;
>  
> -	ret = cros_ec_cmd_xfer(ec_dev, msg);
> +	ret = cros_ec_cmd_xfer_status(ec_dev, msg);
>  	if (ret > 0) {
>  		ec_dev->event_size = ret - 1;
>  		ec_dev->event_data = *event;
> @@ -694,7 +694,7 @@ static int get_keyboard_state_event(struct cros_ec_device *ec_dev)
>  	msg->insize = sizeof(ec_dev->event_data.data);
>  	msg->outsize = 0;
>  
> -	ec_dev->event_size = cros_ec_cmd_xfer(ec_dev, msg);
> +	ec_dev->event_size = cros_ec_cmd_xfer_status(ec_dev, msg);
>  	ec_dev->event_data.event_type = EC_MKBP_EVENT_KEY_MATRIX;
>  	memcpy(&ec_dev->event_data.data, msg->data,
>  	       sizeof(ec_dev->event_data.data));
> @@ -883,11 +883,9 @@ int cros_ec_get_sensor_count(struct cros_ec_dev *ec)
>  	params = (struct ec_params_motion_sense *)msg->data;
>  	params->cmd = MOTIONSENSE_CMD_DUMP;
>  
> -	ret = cros_ec_cmd_xfer(ec->ec_dev, msg);
> +	ret = cros_ec_cmd_xfer_status(ec->ec_dev, msg);
>  	if (ret < 0) {
>  		sensor_count = ret;
> -	} else if (msg->result != EC_RES_SUCCESS) {
> -		sensor_count = -EPROTO;
>  	} else {
>  		resp = (struct ec_response_motion_sense *)msg->data;
>  		sensor_count = resp->dump.sensor_count;
> @@ -898,9 +896,7 @@ int cros_ec_get_sensor_count(struct cros_ec_dev *ec)
>  	 * Check legacy mode: Let's find out if sensors are accessible
>  	 * via LPC interface.
>  	 */
> -	if (sensor_count == -EPROTO &&
> -	    ec->cmd_offset == 0 &&
> -	    ec_dev->cmd_readmem) {
> +	if (sensor_count < 0 && ec->cmd_offset == 0 && ec_dev->cmd_readmem) {
>  		ret = ec_dev->cmd_readmem(ec_dev, EC_MEMMAP_ACC_STATUS,
>  				1, &status);
>  		if (ret >= 0 &&
> @@ -915,9 +911,6 @@ int cros_ec_get_sensor_count(struct cros_ec_dev *ec)
>  			 */
>  			sensor_count = 0;
>  		}
> -	} else if (sensor_count == -EPROTO) {
> -		/* EC responded, but does not understand DUMP command. */
> -		sensor_count = 0;
>  	}
>  	return sensor_count;
>  }
>