From: Florian Fainelli <f.fainelli@gmail.com>
To: Sudeep Holla <sudeep.holla@arm.com>,
Florian Fainelli <f.fainelli@gmail.com>
Cc: linux-kernel@vger.kernel.org,
bcm-kernel-feedback-list@broadcom.com,
Jean Delvare <jdelvare@suse.com>,
Guenter Roeck <linux@roeck-us.net>,
linux-arm-kernel@lists.infradead.org,
"open list:HARDWARE MONITORING" <linux-hwmon@vger.kernel.org>
Subject: Re: [PATCH v5 2/2] hwmon: scmi: Scale values to target desired HWMON units
Date: Tue, 14 May 2019 09:44:02 -0700 [thread overview]
Message-ID: <2cbed0ac-fbfc-e66e-7cb9-908478466a34@gmail.com> (raw)
In-Reply-To: <20190514163707.GA20819@e107155-lin>
On 5/14/19 9:37 AM, Sudeep Holla wrote:
> On Wed, May 08, 2019 at 11:46:35AM -0700, Florian Fainelli wrote:
>> If the SCMI firmware implementation is reporting values in a scale that
>> is different from the HWMON units, we need to scale up or down the value
>> according to how far appart they are.
>>
>> Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
>> ---
>> drivers/hwmon/scmi-hwmon.c | 45 ++++++++++++++++++++++++++++++++++++++
>> 1 file changed, 45 insertions(+)
>>
>> diff --git a/drivers/hwmon/scmi-hwmon.c b/drivers/hwmon/scmi-hwmon.c
>> index a80183a488c5..2c7b87edf5aa 100644
>> --- a/drivers/hwmon/scmi-hwmon.c
>> +++ b/drivers/hwmon/scmi-hwmon.c
>> @@ -18,6 +18,47 @@ struct scmi_sensors {
>> const struct scmi_sensor_info **info[hwmon_max];
>> };
>>
>> +static inline u64 __pow10(u8 x)
>> +{
>> + u64 r = 1;
>> +
>> + while (x--)
>> + r *= 10;
>> +
>> + return r;
>> +}
>> +
>> +static int scmi_hwmon_scale(const struct scmi_sensor_info *sensor, u64 *value)
>> +{
>> + s8 scale = sensor->scale;
>> + u64 f;
>> +
>> + switch (sensor->type) {
>> + case TEMPERATURE_C:
>> + case VOLTAGE:
>> + case CURRENT:
>> + scale += 3;
>> + break;
>> + case POWER:
>> + case ENERGY:
>> + scale += 6;
>> + break;
>> + default:
>> + break;
>> + }
>> +
>
> I was applying this and wanted to check if we can add a check for scale=0
> here and return early here to above the below check and __pow10(0) ?
Doing an early check for scale == 0 sounds like a good idea,good catch!
Feel free to amend the patch directly when you apply it.
>
> Let me know if you agree. I can fix up. Also I will try to test it on
> Juno if firmware behaves correctly :)
Great, thanks.
--
Florian
next prev parent reply other threads:[~2019-05-14 16:44 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-05-08 18:46 [PATCH v5 0/2] hwmon: scmi: Scale values to target desired HWMON units Florian Fainelli
2019-05-08 18:46 ` [PATCH v5 1/2] firmware: arm_scmi: Fetch and store sensor scale Florian Fainelli
2019-05-08 18:46 ` [PATCH v5 2/2] hwmon: scmi: Scale values to target desired HWMON units Florian Fainelli
2019-05-08 21:10 ` Guenter Roeck
2019-05-13 18:10 ` Florian Fainelli
2019-05-14 10:38 ` Sudeep Holla
2019-05-14 16:37 ` Sudeep Holla
2019-05-14 16:44 ` Florian Fainelli [this message]
2019-05-14 16:58 ` Guenter Roeck
2019-05-14 17:00 ` Sudeep Holla
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