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Message-ID: <20140624102213.GH13803@lee--X1>
Date: Tue, 24 Jun 2014 11:22:13 +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 08/10] mfd: cros_ec: Check result code from EC messages
On Wed, 18 Jun 2014, Doug Anderson 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.
>
> [dianders: Added common function to cros_ec.c]
>
> Signed-off-by: Bill Richardson <wfrichar@...omium.org>
> Signed-off-by: Doug Anderson <dianders@...omium.org>
> ---
> Changes in v2:
> - Added common function to cros_ec.c
> - Changed to dev_dbg() as per http://crosreview.com/66726
>
> drivers/mfd/cros_ec.c | 18 ++++++++++++++++++
> drivers/mfd/cros_ec_i2c.c | 8 +++-----
> drivers/mfd/cros_ec_spi.c | 19 ++++++-------------
> include/linux/mfd/cros_ec.h | 12 ++++++++++++
> 4 files changed, 39 insertions(+), 18 deletions(-)
Acked-by: Lee Jones <lee.jones@...aro.org>
> diff --git a/drivers/mfd/cros_ec.c b/drivers/mfd/cros_ec.c
> index 4851ed2..83e30c6 100644
> --- a/drivers/mfd/cros_ec.c
> +++ b/drivers/mfd/cros_ec.c
> @@ -44,6 +44,24 @@ int cros_ec_prepare_tx(struct cros_ec_device *ec_dev,
> }
> EXPORT_SYMBOL(cros_ec_prepare_tx);
>
> +int cros_ec_check_result(struct cros_ec_device *ec_dev,
> + struct cros_ec_command *msg)
> +{
> + switch (msg->result) {
> + case EC_RES_SUCCESS:
> + return 0;
> + case EC_RES_IN_PROGRESS:
> + dev_dbg(ec_dev->dev, "command 0x%02x in progress\n",
> + msg->command);
> + return -EAGAIN;
> + default:
> + dev_dbg(ec_dev->dev, "command 0x%02x returned %d\n",
> + msg->command, msg->result);
> + return 0;
> + }
> +}
> +EXPORT_SYMBOL(cros_ec_check_result);
> +
> static irqreturn_t ec_irq_thread(int irq, void *data)
> {
> struct cros_ec_device *ec_dev = data;
> diff --git a/drivers/mfd/cros_ec_i2c.c b/drivers/mfd/cros_ec_i2c.c
> index 5bb32f5..189e7d1 100644
> --- a/drivers/mfd/cros_ec_i2c.c
> +++ b/drivers/mfd/cros_ec_i2c.c
> @@ -92,12 +92,10 @@ 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];
> + ret = cros_ec_check_result(ec_dev, msg);
> + if (ret)
> goto done;
> - }
>
> /* copy response packet payload and compute checksum */
> sum = in_buf[0] + in_buf[1];
> diff --git a/drivers/mfd/cros_ec_spi.c b/drivers/mfd/cros_ec_spi.c
> index 09ca789..c975087 100644
> --- a/drivers/mfd/cros_ec_spi.c
> +++ b/drivers/mfd/cros_ec_spi.c
> @@ -289,21 +289,14 @@ 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];
> + ret = cros_ec_check_result(ec_dev, ec_msg);
> + if (ret)
> goto exit;
> - }
> +
> len = ptr[1];
> sum = ptr[0] + ptr[1];
> if (len > ec_msg->insize) {
> diff --git a/include/linux/mfd/cros_ec.h b/include/linux/mfd/cros_ec.h
> index 60c0880..1f79f16 100644
> --- a/include/linux/mfd/cros_ec.h
> +++ b/include/linux/mfd/cros_ec.h
> @@ -143,6 +143,18 @@ int cros_ec_prepare_tx(struct cros_ec_device *ec_dev,
> struct cros_ec_command *msg);
>
> /**
> + * cros_ec_check_result - Check ec_msg->result
> + *
> + * This is used by ChromeOS EC drivers to check the ec_msg->result for
> + * errors and to warn about them.
> + *
> + * @ec_dev: EC device
> + * @msg: Message to check
> + */
> +int cros_ec_check_result(struct cros_ec_device *ec_dev,
> + struct cros_ec_command *msg);
> +
> +/**
> * cros_ec_remove - Remove a ChromeOS EC
> *
> * Call this to deregister a ChromeOS EC, then clean up any private data.
--
Lee Jones
Linaro STMicroelectronics Landing Team Lead
Linaro.org │ Open source software for ARM SoCs
Follow Linaro: Facebook | Twitter | Blog
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