linux-kernel - Re: [PATCH] mfd: cros_ec: Use proper protocol transfer function

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Date:   Tue, 30 Aug 2016 15:38:18 +0100
From:   Lee Jones <lee.jones@...aro.org>
To:     Brian Norris <briannorris@...omium.org>
Cc:     Olof Johansson <olof@...om.net>, linux-kernel@...r.kernel.org,
        Doug Anderson <dianders@...omium.org>,
        Brian Norris <computersforpeace@...il.com>,
        Javier Martinez Canillas <javier@....samsung.com>,
        Shawn Nematbakhsh <shawnn@...omium.org>,
        Gwendal Grignou <gwendal@...omium.org>,
        Enric Balletbo <enric.balletbo@...labora.co.uk>,
        Tomeu Vizoso <tomeu.vizoso@...labora.com>
Subject: Re: [PATCH] mfd: cros_ec: Use proper protocol transfer function

On Wed, 10 Aug 2016, Brian Norris wrote:

> From: Shawn Nematbakhsh <shawnn@...omium.org>
> 
> pkt_xfer should be used for protocol v3, and cmd_xfer otherwise. We had
> one instance of these functions correct, but not the second, fall-back
> case. We use the fall-back only when the first command returns an
> IN_PROGRESS status, which is only used on some EC firmwares where we
> don't want to constantly poll the bus, but instead back off and
> sleep/retry for a little while.
> 
> Fixes: 2c7589af3c4d ("mfd: cros_ec: add proto v3 skeleton")
> Signed-off-by: Shawn Nematbakhsh <shawnn@...omium.org>
> Signed-off-by: Brian Norris <briannorris@...omium.org>
> ---
> MAINTAINERS tells me this goes through Olof, but many things have gone through
> Lee.

Only if there are changes in the set pertaining to MFD.

This one is all Olof's.

>  drivers/platform/chrome/cros_ec_proto.c | 8 +++++---
>  1 file changed, 5 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/platform/chrome/cros_ec_proto.c b/drivers/platform/chrome/cros_ec_proto.c
> index 6c084b266651..591f0b0becbd 100644
> --- a/drivers/platform/chrome/cros_ec_proto.c
> +++ b/drivers/platform/chrome/cros_ec_proto.c
> @@ -59,12 +59,14 @@ static int send_command(struct cros_ec_device *ec_dev,
>  			struct cros_ec_command *msg)
>  {
>  	int ret;
> +	int (*xfer_fxn)(struct cros_ec_device *ec, struct cros_ec_command *msg);
>  
>  	if (ec_dev->proto_version > 2)
> -		ret = ec_dev->pkt_xfer(ec_dev, msg);
> +		xfer_fxn = ec_dev->pkt_xfer;
>  	else
> -		ret = ec_dev->cmd_xfer(ec_dev, msg);
> +		xfer_fxn = ec_dev->cmd_xfer;
>  
> +	ret = (*xfer_fxn)(ec_dev, msg);
>  	if (msg->result == EC_RES_IN_PROGRESS) {
>  		int i;
>  		struct cros_ec_command *status_msg;
> @@ -87,7 +89,7 @@ static int send_command(struct cros_ec_device *ec_dev,
>  		for (i = 0; i < EC_COMMAND_RETRIES; i++) {
>  			usleep_range(10000, 11000);
>  
> -			ret = ec_dev->cmd_xfer(ec_dev, status_msg);
> +			ret = (*xfer_fxn)(ec_dev, status_msg);
>  			if (ret < 0)
>  				break;
>  

-- 
Lee Jones
Linaro STMicroelectronics Landing Team Lead
Linaro.org │ Open source software for ARM SoCs
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