From: Guenter Roeck <linux@roeck-us.net>
To: Eddie James <eajames@linux.ibm.com>
Cc: Alexander Amelkin <a.amelkin@yadro.com>,
linux-hwmon@vger.kernel.org,
"Edward A . James" <eajames@us.ibm.com>,
openbmc@lists.ozlabs.org,
Alexander Soldatov <a.soldatov@yadro.com>
Subject: Re: [PATCH v2 1/1] hwmon (occ): Add temp sensor value check
Date: Wed, 17 Apr 2019 12:36:14 -0700 [thread overview]
Message-ID: <20190417193614.GB23825@roeck-us.net> (raw)
In-Reply-To: <48e874f0-c865-12c7-cf93-5e569c27f877@linux.ibm.com>
On Wed, Apr 17, 2019 at 01:35:41PM -0500, Eddie James wrote:
>
> On 4/17/19 1:03 PM, Alexander Amelkin wrote:
> >From: Alexander Soldatov <a.soldatov@yadro.com>
> >
> >The occ driver supports two formats for the temp sensor value.
> >
> >The OCC firmware for P8 supports only the first format, for which
> >no range checking or error processing is performed in the driver.
> >Inspecting the OCC sources for P8 reveals that OCC may send
> >a special value 0xFFFF to indicate that a sensor read timeout
> >has occurred, see
> >
> >https://github.com/open-power/occ/blob/master_p8/src/occ/cmdh/cmdh_fsp_cmds.c#L395
> >
> >That situation wasn't handled in the driver. This patch adds invalid
> >temp value check for the sensor data format 1 and handles it the same
> >way as it is done for the format 2, where EREMOTEIO is reported for
> >this case.
>
>
> Thanks Alexander and Guenter.
>
>
> Reviewed-by: Eddie James <eajames@linux.ibm.com>
>
Applied.
Thanks,
Guenter
>
> >
> >Signed-off-by: Alexander Soldatov <a.soldatov@yadro.com>
> >Signed-off-by: Alexander Amelkin <a.amelkin@yadro.com>
> >Reviewed-by: Alexander Amelkin <a.amelkin@yadro.com>
> >Cc: Edward A. James <eajames@us.ibm.com>
> >Cc: Joel Stanley <joel@jms.id.au>
> >---
> > drivers/hwmon/occ/common.c | 4 ++++
> > 1 file changed, 4 insertions(+)
> >
> >diff --git a/drivers/hwmon/occ/common.c b/drivers/hwmon/occ/common.c
> >index 4679acb..825631c 100644
> >--- a/drivers/hwmon/occ/common.c
> >+++ b/drivers/hwmon/occ/common.c
> >@@ -235,6 +235,12 @@ static ssize_t occ_show_temp_1(struct device *dev,
> > val = get_unaligned_be16(&temp->sensor_id);
> > break;
> > case 1:
> >+ /*
> >+ * If a sensor reading has expired and couldn't be refreshed,
> >+ * OCC returns 0xFFFF for that sensor.
> >+ */
> >+ if (temp->value == 0xFFFF)
> >+ return -EREMOTEIO;
> > val = get_unaligned_be16(&temp->value) * 1000;
> > break;
> > default:
>
prev parent reply other threads:[~2019-04-17 19:36 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-04-17 11:26 [PATCH 1/1] hwmon (occ): Add temp sensor value check Alexander Amelkin
2019-04-17 13:03 ` Guenter Roeck
2019-04-17 17:46 ` Alexander Amelkin
2019-04-17 18:03 ` [PATCH v2 " Alexander Amelkin
2019-04-17 18:35 ` Eddie James
2019-04-17 19:36 ` Guenter Roeck [this message]
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