linux-kernel - Re: [PATCH 09/10] mfd: cros_ec: Check result code from EC messages

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Date:	Tue, 17 Jun 2014 20:43:42 -0700
From:	Simon Glass <sjg@...omium.org>
To:	Doug Anderson <dianders@...omium.org>
Cc:	Lee Jones <lee.jones@...aro.org>,
	Andrew Bresticker <abrestic@...omium.org>,
	Stephen Warren <swarren@...dotorg.org>,
	Olof Johansson <olof@...om.net>,
	Sonny Rao <sonnyrao@...omium.org>,
	linux-samsung-soc <linux-samsung-soc@...r.kernel.org>,
	Javier Martinez Canillas <javier.martinez@...labora.co.uk>,
	Bill Richardson <wfrichar@...omium.org>,
	Wolfram Sang <wsa@...-dreams.de>,
	Mark Brown <broonie@...nel.org>,
	Samuel Ortiz <sameo@...ux.intel.com>,
	lk <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 09/10] mfd: cros_ec: Check result code from EC messages

Hi Doug,

On 16 June 2014 14:39, Doug Anderson <dianders@...omium.org> wrote:
> From: Bill Richardson <wfrichar@...omium.org>
>
> Just because the host was able to talk to the EC doesn't mean that the EC
> was happy with what it was told. Errors in communincation are not the same
> as error messages from the EC itself.
>
> This change lets the EC report its errors separately.
>
> Signed-off-by: Bill Richardson <wfrichar@...omium.org>
> Signed-off-by: Doug Anderson <dianders@...omium.org>
> ---
>  drivers/mfd/cros_ec_i2c.c | 15 +++++++++++----
>  drivers/mfd/cros_ec_spi.c | 26 ++++++++++++++------------
>  2 files changed, 25 insertions(+), 16 deletions(-)
>
> diff --git a/drivers/mfd/cros_ec_i2c.c b/drivers/mfd/cros_ec_i2c.c
> index 5bb32f5..2276096 100644
> --- a/drivers/mfd/cros_ec_i2c.c
> +++ b/drivers/mfd/cros_ec_i2c.c
> @@ -92,11 +92,18 @@ static int cros_ec_cmd_xfer_i2c(struct cros_ec_device *ec_dev,
>         }
>
>         /* check response error code */
> -       if (i2c_msg[1].buf[0]) {
> -               dev_warn(ec_dev->dev, "command 0x%02x returned an error %d\n",
> -                        msg->command, i2c_msg[1].buf[0]);
> -               ret = -EINVAL;
> +       msg->result = i2c_msg[1].buf[0];
> +       switch (msg->result) {
> +       case EC_RES_SUCCESS:
> +               break;
> +       case EC_RES_IN_PROGRESS:
> +               ret = -EAGAIN;
> +               dev_dbg(ec_dev->dev, "command 0x%02x in progress\n",
> +                       msg->command);
>                 goto done;
> +       default:
> +               dev_warn(ec_dev->dev, "command 0x%02x returned %d\n",
> +                        msg->command, msg->result);
>         }
>
>         /* copy response packet payload and compute checksum */
> diff --git a/drivers/mfd/cros_ec_spi.c b/drivers/mfd/cros_ec_spi.c
> index 09ca789..4d34f1c 100644
> --- a/drivers/mfd/cros_ec_spi.c
> +++ b/drivers/mfd/cros_ec_spi.c
> @@ -289,21 +289,23 @@ static int cros_ec_cmd_xfer_spi(struct cros_ec_device *ec_dev,
>                 goto exit;
>         }
>
> -       /* 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->command);
> -                       ret = -EAGAIN;
> -                       goto exit;
> -               }
> -               dev_warn(ec_dev->dev, "command 0x%02x returned an error %d\n",
> -                        ec_msg->command, ptr[0]);
> -               debug_packet(ec_dev->dev, "in_err", ptr, len);
> -               ret = -EINVAL;
> +
> +       /* check response error code */
> +       ec_msg->result = ptr[0];
> +       switch (ec_msg->result) {
> +       case EC_RES_SUCCESS:
> +               break;
> +       case EC_RES_IN_PROGRESS:
> +               ret = -EAGAIN;
> +               dev_dbg(ec_dev->dev, "command 0x%02x in progress\n",
> +                       ec_msg->command);
>                 goto exit;
> +       default:
> +               dev_warn(ec_dev->dev, "command 0x%02x returned %d\n",
> +                        ec_msg->command, ec_msg->result);
>         }

Since this code is the same as the above, should it go in a common
function in cros_ec?

> +
>         len = ptr[1];
>         sum = ptr[0] + ptr[1];
>         if (len > ec_msg->insize) {
> --
> 2.0.0.526.g5318336
>

Regards,
Simon
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