linux-kernel - Re: [PATCH v2 04/10] mdf: cros_ec: Detect in-progress commands

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Message-ID: <20140703072850.GB30534@lee--X1>
Date:	Thu, 3 Jul 2014 08:28:50 +0100
From:	Lee Jones <lee.jones@...aro.org>
To:	Doug Anderson <dianders@...omium.org>
Cc:	Andrew Bresticker <abrestic@...omium.org>, swarren@...dotorg.org,
	olof@...om.net, Sonny Rao <sonnyrao@...omium.org>,
	linux-samsung-soc@...r.kernel.org,
	Javier Martinez Canillas <javier.martinez@...labora.co.uk>,
	Bill Richardson <wfrichar@...omium.org>, sjg@...omium.org,
	Wolfram Sang <wsa@...-dreams.de>, broonie@...nel.org,
	sameo@...ux.intel.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 04/10] mdf: cros_ec: Detect in-progress commands

On Wed, 18 Jun 2014, Doug Anderson wrote:

> From: Simon Glass <sjg@...omium.org>
> 
> Some commands take a while to execute. Use -EAGAIN to signal this to the
> caller.
> 
> Signed-off-by: Simon Glass <sjg@...omium.org>
> Signed-off-by: Doug Anderson <dianders@...omium.org>
> Acked-by: Lee Jones <lee.jones@...aro.org>
> ---
> Changes in v2: None
> 
>  drivers/mfd/cros_ec_spi.c | 6 ++++++
>  1 file changed, 6 insertions(+)

Patch applied.

Clause: There is a chance that this patch might not be seen in -next
for ~24-48hrs.  If it's not there by 72hrs, feel free to poke.

> diff --git a/drivers/mfd/cros_ec_spi.c b/drivers/mfd/cros_ec_spi.c
> index 52d4d7b..c29a2d7 100644
> --- a/drivers/mfd/cros_ec_spi.c
> +++ b/drivers/mfd/cros_ec_spi.c
> @@ -292,6 +292,12 @@ static int cros_ec_cmd_xfer_spi(struct cros_ec_device *ec_dev,
>  	/* check response error code */
>  	ptr = ec_dev->din;
>  	if (ptr[0]) {
> +		if (ptr[0] == EC_RES_IN_PROGRESS) {
> +			dev_dbg(ec_dev->dev, "command 0x%02x in progress\n",
> +				ec_msg->cmd);
> +			ret = -EAGAIN;
> +			goto exit;
> +		}
>  		dev_warn(ec_dev->dev, "command 0x%02x returned an error %d\n",
>  			 ec_msg->cmd, ptr[0]);
>  		debug_packet(ec_dev->dev, "in_err", ptr, len);

-- 
Lee Jones
Linaro STMicroelectronics Landing Team Lead
Linaro.org │ Open source software for ARM SoCs
Follow Linaro: Facebook | Twitter | Blog
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