linux-kernel - Re: [PATCH v5] drm/i915/hwmon: expose fan speed

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Message-ID: <ZroK4oSAte9qdnA8@smile.fi.intel.com>
Date: Mon, 12 Aug 2024 16:15:14 +0300
From: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To: Raag Jadav <raag.jadav@...el.com>
Cc: jani.nikula@...ux.intel.com, joonas.lahtinen@...ux.intel.com,
	rodrigo.vivi@...el.com, tursulin@...ulin.net, airlied@...il.com,
	daniel@...ll.ch, linux@...ck-us.net, andi.shyti@...ux.intel.com,
	intel-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org,
	linux-hwmon@...r.kernel.org, linux-kernel@...r.kernel.org,
	anshuman.gupta@...el.com, badal.nilawar@...el.com,
	riana.tauro@...el.com, ashutosh.dixit@...el.com,
	karthik.poosa@...el.com
Subject: Re: [PATCH v5] drm/i915/hwmon: expose fan speed

On Mon, Aug 12, 2024 at 01:45:38PM +0530, Raag Jadav wrote:
> Add hwmon support for fan1_input attribute, which will expose fan speed
> in RPM. With this in place we can monitor fan speed using lm-sensors tool.
> 
> $ sensors
> i915-pci-0300
> Adapter: PCI adapter
> in0:         653.00 mV
> fan1:        3833 RPM
> power1:           N/A  (max =  43.00 W)
> energy1:      32.02 kJ

...

> +static int
> +hwm_fan_read(struct hwm_drvdata *ddat, u32 attr, long *val)
> +{
> +	struct i915_hwmon *hwmon = ddat->hwmon;
> +	struct hwm_fan_info *fi = &ddat->fi;
> +	u64 rotations, time_now, time;
> +	intel_wakeref_t wakeref;
> +	u32 reg_val, pulses;
> +	int ret = 0;
> +
> +	if (attr != hwmon_fan_input)
> +		return -EOPNOTSUPP;
> +
> +	wakeref = intel_runtime_pm_get(ddat->uncore->rpm);
> +	mutex_lock(&hwmon->hwmon_lock);
> +
> +	reg_val = intel_uncore_read(ddat->uncore, hwmon->rg.fan_speed);
> +	time_now = get_jiffies_64();

> +	/* Handle HW register overflow */
> +	if (reg_val >= fi->reg_val_prev)
> +		pulses = reg_val - fi->reg_val_prev;
> +	else
> +		pulses = UINT_MAX - fi->reg_val_prev + reg_val;

Isn't it the abs_diff() reimplementation?

> +	/*
> +	 * HW register value is accumulated count of pulses from
> +	 * PWM fan with the scale of 2 pulses per rotation.
> +	 */
> +	rotations = pulses / 2;
> +
> +	time = jiffies_delta_to_msecs(time_now - fi->time_prev);
> +	if (unlikely(!time)) {
> +		ret = -EAGAIN;
> +		goto exit;
> +	}
> +
> +	/*
> +	 * Convert to minutes for calculating RPM.
> +	 * RPM = number of rotations * msecs per minute / time in msecs
> +	 */
> +	*val = DIV_ROUND_UP(rotations * (MSEC_PER_SEC * 60), time);
> +
> +	fi->reg_val_prev = reg_val;
> +	fi->time_prev = time_now;
> +exit:
> +	mutex_unlock(&hwmon->hwmon_lock);
> +	intel_runtime_pm_put(ddat->uncore->rpm, wakeref);
> +	return ret;
> +}


-- 
With Best Regards,
Andy Shevchenko