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drm/nouveau/pm: manual pwm fanspeed management for nv40+ boards

Exposes the following sysfs entries:
- fan0_input: read the rotational speed of the fan (poll a bit during 250ms)
- pwm0: set the pwm duty cycle
- pwm0_min/max: set the minimum/maximum pwm value

v2 (Ben Skeggs):
- nv50 pwm controller code removed in favour of other more complete code
- FAN_RPM -> FAN_SENSE
- merged FAN_SENSE readout into common code, not at all nv50-specific
- protected fanspeed changes with perflvl_wr
- formatting tidying
- added some comments where things are shaky

v3 (Martin Peres)
- ensure duty min/max from thermal table are sane

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
Signed-off-by: Martin Peres <martin.peres@ensi-bourges.fr>
This commit is contained in:
Martin Peres 2011-08-15 11:10:30 +10:00 committed by Ben Skeggs
parent cb9fa62671
commit 11b7d89521
4 changed files with 252 additions and 6 deletions

View File

@ -58,6 +58,8 @@ struct dcb_i2c_entry {
enum dcb_gpio_tag {
DCB_GPIO_TVDAC0 = 0xc,
DCB_GPIO_TVDAC1 = 0x2d,
DCB_GPIO_PWM_FAN = 0x9,
DCB_GPIO_FAN_SENSE = 0x3d,
};
struct dcb_gpio_entry {

View File

@ -521,6 +521,11 @@ struct nouveau_pm_memtimings {
int nr_timing;
};
struct nouveau_pm_fan {
u32 min_duty;
u32 max_duty;
};
struct nouveau_pm_engine {
struct nouveau_pm_voltage voltage;
struct nouveau_pm_level perflvl[NOUVEAU_PM_MAX_LEVEL];
@ -528,6 +533,7 @@ struct nouveau_pm_engine {
struct nouveau_pm_memtimings memtimings;
struct nouveau_pm_temp_sensor_constants sensor_constants;
struct nouveau_pm_threshold_temp threshold_temp;
struct nouveau_pm_fan fan;
u32 pwm_divisor;
struct nouveau_pm_level boot;

View File

@ -64,6 +64,10 @@ nouveau_pm_perflvl_set(struct drm_device *dev, struct nouveau_pm_level *perflvl)
if (perflvl == pm->cur)
return 0;
/*XXX: not on all boards, we should control based on temperature
* on recent boards.. or maybe on some other factor we don't
* know about?
*/
if (pm->fanspeed_set && perflvl->fanspeed) {
ret = pm->fanspeed_set(dev, perflvl->fanspeed);
if (ret)
@ -424,6 +428,176 @@ static SENSOR_DEVICE_ATTR(update_rate, S_IRUGO,
nouveau_hwmon_show_update_rate,
NULL, 0);
static ssize_t
nouveau_hwmon_show_fan0_input(struct device *d, struct device_attribute *attr,
char *buf)
{
struct drm_device *dev = dev_get_drvdata(d);
struct drm_nouveau_private *dev_priv = dev->dev_private;
struct nouveau_timer_engine *ptimer = &dev_priv->engine.timer;
struct nouveau_gpio_engine *pgpio = &dev_priv->engine.gpio;
struct dcb_gpio_entry *gpio;
u32 cycles, cur, prev;
u64 start;
gpio = nouveau_bios_gpio_entry(dev, DCB_GPIO_FAN_SENSE);
if (!gpio)
return -ENODEV;
/* Monitor the GPIO input 0x3b for 250ms.
* When the fan spins, it changes the value of GPIO FAN_SENSE.
* We get 4 changes (0 -> 1 -> 0 -> 1 -> [...]) per complete rotation.
*/
start = ptimer->read(dev);
prev = pgpio->get(dev, DCB_GPIO_FAN_SENSE);
cycles = 0;
do {
cur = pgpio->get(dev, DCB_GPIO_FAN_SENSE);
if (prev != cur) {
cycles++;
prev = cur;
}
usleep_range(500, 1000); /* supports 0 < rpm < 7500 */
} while (ptimer->read(dev) - start < 250000000);
/* interpolate to get rpm */
return sprintf(buf, "%i\n", cycles / 4 * 4 * 60);
}
static SENSOR_DEVICE_ATTR(fan0_input, S_IRUGO, nouveau_hwmon_show_fan0_input,
NULL, 0);
static ssize_t
nouveau_hwmon_get_pwm0(struct device *d, struct device_attribute *a, char *buf)
{
struct drm_device *dev = dev_get_drvdata(d);
struct drm_nouveau_private *dev_priv = dev->dev_private;
struct nouveau_pm_engine *pm = &dev_priv->engine.pm;
int ret = -ENODEV;
if (pm->fanspeed_get)
ret = pm->fanspeed_get(dev);
if (ret < 0)
return ret;
return sprintf(buf, "%i\n", ret);
}
static ssize_t
nouveau_hwmon_set_pwm0(struct device *d, struct device_attribute *a,
const char *buf, size_t count)
{
struct drm_device *dev = dev_get_drvdata(d);
struct drm_nouveau_private *dev_priv = dev->dev_private;
struct nouveau_pm_engine *pm = &dev_priv->engine.pm;
int ret = -ENODEV;
long value;
if (nouveau_perflvl_wr != 7777)
return -EPERM;
if (strict_strtol(buf, 10, &value) == -EINVAL)
return -EINVAL;
if (value < pm->fan.min_duty)
value = pm->fan.min_duty;
if (value > pm->fan.max_duty)
value = pm->fan.max_duty;
if (pm->fanspeed_set)
ret = pm->fanspeed_set(dev, value);
if (ret)
return ret;
return count;
}
static SENSOR_DEVICE_ATTR(pwm0, S_IRUGO | S_IWUSR,
nouveau_hwmon_get_pwm0,
nouveau_hwmon_set_pwm0, 0);
static ssize_t
nouveau_hwmon_get_pwm0_min(struct device *d,
struct device_attribute *a, char *buf)
{
struct drm_device *dev = dev_get_drvdata(d);
struct drm_nouveau_private *dev_priv = dev->dev_private;
struct nouveau_pm_engine *pm = &dev_priv->engine.pm;
return sprintf(buf, "%i\n", pm->fan.min_duty);
}
static ssize_t
nouveau_hwmon_set_pwm0_min(struct device *d, struct device_attribute *a,
const char *buf, size_t count)
{
struct drm_device *dev = dev_get_drvdata(d);
struct drm_nouveau_private *dev_priv = dev->dev_private;
struct nouveau_pm_engine *pm = &dev_priv->engine.pm;
long value;
if (strict_strtol(buf, 10, &value) == -EINVAL)
return -EINVAL;
if (value < 0)
value = 0;
if (pm->fan.max_duty - value < 10)
value = pm->fan.max_duty - 10;
if (value < 10)
pm->fan.min_duty = 10;
else
pm->fan.min_duty = value;
return count;
}
static SENSOR_DEVICE_ATTR(pwm0_min, S_IRUGO | S_IWUSR,
nouveau_hwmon_get_pwm0_min,
nouveau_hwmon_set_pwm0_min, 0);
static ssize_t
nouveau_hwmon_get_pwm0_max(struct device *d,
struct device_attribute *a, char *buf)
{
struct drm_device *dev = dev_get_drvdata(d);
struct drm_nouveau_private *dev_priv = dev->dev_private;
struct nouveau_pm_engine *pm = &dev_priv->engine.pm;
return sprintf(buf, "%i\n", pm->fan.max_duty);
}
static ssize_t
nouveau_hwmon_set_pwm0_max(struct device *d, struct device_attribute *a,
const char *buf, size_t count)
{
struct drm_device *dev = dev_get_drvdata(d);
struct drm_nouveau_private *dev_priv = dev->dev_private;
struct nouveau_pm_engine *pm = &dev_priv->engine.pm;
long value;
if (strict_strtol(buf, 10, &value) == -EINVAL)
return -EINVAL;
if (value < 0)
value = 0;
if (value - pm->fan.min_duty < 10)
value = pm->fan.min_duty + 10;
if (value > 100)
pm->fan.max_duty = 100;
else
pm->fan.max_duty = value;
return count;
}
static SENSOR_DEVICE_ATTR(pwm0_max, S_IRUGO | S_IWUSR,
nouveau_hwmon_get_pwm0_max,
nouveau_hwmon_set_pwm0_max, 0);
static struct attribute *hwmon_attributes[] = {
&sensor_dev_attr_temp1_input.dev_attr.attr,
&sensor_dev_attr_temp1_max.dev_attr.attr,
@ -432,10 +606,26 @@ static struct attribute *hwmon_attributes[] = {
&sensor_dev_attr_update_rate.dev_attr.attr,
NULL
};
static struct attribute *hwmon_fan_rpm_attributes[] = {
&sensor_dev_attr_fan0_input.dev_attr.attr,
NULL
};
static struct attribute *hwmon_pwm_fan_attributes[] = {
&sensor_dev_attr_pwm0.dev_attr.attr,
&sensor_dev_attr_pwm0_min.dev_attr.attr,
&sensor_dev_attr_pwm0_max.dev_attr.attr,
NULL
};
static const struct attribute_group hwmon_attrgroup = {
.attrs = hwmon_attributes,
};
static const struct attribute_group hwmon_fan_rpm_attrgroup = {
.attrs = hwmon_fan_rpm_attributes,
};
static const struct attribute_group hwmon_pwm_fan_attrgroup = {
.attrs = hwmon_pwm_fan_attributes,
};
#endif
static int
@ -445,7 +635,7 @@ nouveau_hwmon_init(struct drm_device *dev)
struct drm_nouveau_private *dev_priv = dev->dev_private;
struct nouveau_pm_engine *pm = &dev_priv->engine.pm;
struct device *hwmon_dev;
int ret;
int ret = 0;
if (!pm->temp_get)
return -ENODEV;
@ -458,17 +648,46 @@ nouveau_hwmon_init(struct drm_device *dev)
return ret;
}
dev_set_drvdata(hwmon_dev, dev);
/* default sysfs entries */
ret = sysfs_create_group(&dev->pdev->dev.kobj, &hwmon_attrgroup);
if (ret) {
NV_ERROR(dev,
"Unable to create hwmon sysfs file: %d\n", ret);
hwmon_device_unregister(hwmon_dev);
return ret;
if (ret)
goto error;
}
/* if the card has a pwm fan */
/*XXX: incorrect, need better detection for this, some boards have
* the gpio entries for pwm fan control even when there's no
* actual fan connected to it... therm table? */
if (pm->fanspeed_get && pm->fanspeed_get(dev) >= 0) {
ret = sysfs_create_group(&dev->pdev->dev.kobj,
&hwmon_pwm_fan_attrgroup);
if (ret)
goto error;
}
/* if the card can read the fan rpm */
if (nouveau_bios_gpio_entry(dev, DCB_GPIO_FAN_SENSE)) {
ret = sysfs_create_group(&dev->pdev->dev.kobj,
&hwmon_fan_rpm_attrgroup);
if (ret)
goto error;
}
pm->hwmon = hwmon_dev;
#endif
return 0;
error:
NV_ERROR(dev, "Unable to create some hwmon sysfs files: %d\n", ret);
hwmon_device_unregister(hwmon_dev);
pm->hwmon = NULL;
return ret;
#else
pm->hwmon = NULL;
return 0;
#endif
}
static void
@ -480,6 +699,9 @@ nouveau_hwmon_fini(struct drm_device *dev)
if (pm->hwmon) {
sysfs_remove_group(&dev->pdev->dev.kobj, &hwmon_attrgroup);
sysfs_remove_group(&dev->pdev->dev.kobj, &hwmon_pwm_fan_attrgroup);
sysfs_remove_group(&dev->pdev->dev.kobj, &hwmon_fan_rpm_attrgroup);
hwmon_device_unregister(pm->hwmon);
}
#endif

View File

@ -55,6 +55,10 @@ nouveau_temp_vbios_parse(struct drm_device *dev, u8 *temp)
temps->down_clock = 100;
temps->fan_boost = 90;
/* Set the default range for the pwm fan */
pm->fan.min_duty = 30;
pm->fan.max_duty = 100;
/* Set the known default values to setup the temperature sensor */
if (dev_priv->card_type >= NV_40) {
switch (dev_priv->chipset) {
@ -156,11 +160,23 @@ nouveau_temp_vbios_parse(struct drm_device *dev, u8 *temp)
case 0x13:
sensor->slope_div = value;
break;
case 0x22:
pm->fan.min_duty = value & 0xff;
pm->fan.max_duty = (value & 0xff00) >> 8;
break;
}
temp += recordlen;
}
nouveau_temp_safety_checks(dev);
/* check the fan min/max settings */
if (pm->fan.min_duty < 10)
pm->fan.min_duty = 10;
if (pm->fan.max_duty > 100)
pm->fan.max_duty = 100;
if (pm->fan.max_duty < pm->fan.min_duty)
pm->fan.max_duty = pm->fan.min_duty;
}
static int