Linux-Hwmon Archive on lore.kernel.org
 help / Atom feed
From: Guenter Roeck <linux@roeck-us.net>
To: Florian Fainelli <f.fainelli@gmail.com>
Cc: Sudeep Holla <sudeep.holla@arm.com>,
	linux-kernel@vger.kernel.org,
	bcm-kernel-feedback-list@broadcom.com,
	Jean Delvare <jdelvare@suse.com>,
	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 09:58:06 -0700
Message-ID: <20190514165806.GA30274@roeck-us.net> (raw)
In-Reply-To: <2cbed0ac-fbfc-e66e-7cb9-908478466a34@gmail.com>

On Tue, May 14, 2019 at 09:44:02AM -0700, Florian Fainelli wrote:
> 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.
> 

Ok with me. Just make it == 0 :-).

Guenter

> > 
> > 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

  reply index

Thread overview: 10+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-05-08 18:46 [PATCH v5 0/2] " 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
2019-05-14 16:58       ` Guenter Roeck [this message]
2019-05-14 17:00         ` Sudeep Holla

Reply instructions:

You may reply publically to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20190514165806.GA30274@roeck-us.net \
    --to=linux@roeck-us.net \
    --cc=bcm-kernel-feedback-list@broadcom.com \
    --cc=f.fainelli@gmail.com \
    --cc=jdelvare@suse.com \
    --cc=linux-arm-kernel@lists.infradead.org \
    --cc=linux-hwmon@vger.kernel.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=sudeep.holla@arm.com \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

Linux-Hwmon Archive on lore.kernel.org

Archives are clonable:
	git clone --mirror https://lore.kernel.org/linux-hwmon/0 linux-hwmon/git/0.git

	# If you have public-inbox 1.1+ installed, you may
	# initialize and index your mirror using the following commands:
	public-inbox-init -V2 linux-hwmon linux-hwmon/ https://lore.kernel.org/linux-hwmon \
		linux-hwmon@vger.kernel.org linux-hwmon@archiver.kernel.org
	public-inbox-index linux-hwmon


Newsgroup available over NNTP:
	nntp://nntp.lore.kernel.org/org.kernel.vger.linux-hwmon


AGPL code for this site: git clone https://public-inbox.org/ public-inbox