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drm/nouveau/pm: introduce generic handler for on-chip fan controller 

The handling of the internal pwm fan controller is similar enough between
current chipsets that it makes sense to share the logic, and bugfixes :)

No hw backends converted yet, will automatically fall-through to the
"old" per-chipset fanspeed hooks for now.

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
This commit is contained in:
Ben Skeggs 2011-09-17 01:42:12 +10:00
parent 85a2a36521
commit a175094cd8
2 changed files with 80 additions and 16 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
drivers/gpu/drm/nouveau/nouveau_drv.h
View File

@ -554,6 +554,8 @@ struct nouveau_pm_engine {
int (*voltage_get)(struct drm_device *);
int (*voltage_set)(struct drm_device *, int voltage);
int (*pwm_get)(struct drm_device *, struct dcb_gpio_entry*, u32*, u32*);
int (*pwm_set)(struct drm_device *, struct dcb_gpio_entry*, u32, u32);
int (*fanspeed_get)(struct drm_device *);
int (*fanspeed_set)(struct drm_device *, int fanspeed);
int (*temp_get)(struct drm_device *);

94
drivers/gpu/drm/nouveau/nouveau_pm.c
View File

@ -34,6 +34,74 @@
#include <linux/hwmon.h>
#include <linux/hwmon-sysfs.h>
static int
nouveau_pwmfan_get(struct drm_device *dev)
{
struct drm_nouveau_private *dev_priv = dev->dev_private;
struct nouveau_gpio_engine *pgpio = &dev_priv->engine.gpio;
struct nouveau_pm_engine *pm = &dev_priv->engine.pm;
struct dcb_gpio_entry *gpio;
u32 divs, duty;
int ret;
if (!pm->pwm_get) {
if (pm->fanspeed_get)
return pm->fanspeed_get(dev);
return -ENODEV;
}
gpio = nouveau_bios_gpio_entry(dev, DCB_GPIO_PWM_FAN);
if (gpio) {
ret = pm->pwm_get(dev, gpio, &divs, &duty);
if (ret == 0) {
divs = max(divs, duty);
if (dev_priv->card_type <= NV_40 ||
(gpio->state[0] & 1))
duty = divs - duty;
return (duty * 100) / divs;
}
return pgpio->get(dev, gpio->tag) * 100;
}
return -ENODEV;
}
static int
nouveau_pwmfan_set(struct drm_device *dev, int percent)
{
struct drm_nouveau_private *dev_priv = dev->dev_private;
struct nouveau_pm_engine *pm = &dev_priv->engine.pm;
struct dcb_gpio_entry *gpio;
u32 divs, duty;
if (!pm->pwm_set) {
if (pm->fanspeed_set)
return pm->fanspeed_set(dev, percent);
return -ENODEV;
}
gpio = nouveau_bios_gpio_entry(dev, DCB_GPIO_PWM_FAN);
if (gpio) {
divs = pm->pwm_divisor;
if (pm->fan.pwm_freq) {
/*XXX: PNVIO clock more than likely... */
divs = 135000 / pm->fan.pwm_freq;
if (dev_priv->chipset < 0xa3)
divs /= 4;
}
duty = ((divs * percent) + 99) / 100;
if (dev_priv->card_type <= NV_40 ||
(gpio->state[0] & 1))
duty = divs - duty;
return pm->pwm_set(dev, gpio, divs, duty);
}
return -ENODEV;
}
static int
nouveau_pm_clock_set(struct drm_device *dev, struct nouveau_pm_level *perflvl,
u8 id, u32 khz)
@ -68,9 +136,9 @@ nouveau_pm_perflvl_set(struct drm_device *dev, struct nouveau_pm_level *perflvl)
* 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)
if (perflvl->fanspeed) {
ret = nouveau_pwmfan_set(dev, perflvl->fanspeed);
if (ret && ret != -ENODEV)
NV_ERROR(dev, "set fanspeed failed: %d\n", ret);
}
@ -171,11 +239,9 @@ nouveau_pm_perflvl_get(struct drm_device *dev, struct nouveau_pm_level *perflvl)
}
}
if (pm->fanspeed_get) {
ret = pm->fanspeed_get(dev);
if (ret > 0)
perflvl->fanspeed = ret;
}
ret = nouveau_pwmfan_get(dev);
if (ret > 0)
perflvl->fanspeed = ret;
return 0;
}
@ -471,12 +537,9 @@ 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;
int ret;
if (pm->fanspeed_get)
ret = pm->fanspeed_get(dev);
ret = nouveau_pwmfan_get(dev);
if (ret < 0)
return ret;
@ -504,8 +567,7 @@ nouveau_hwmon_set_pwm0(struct device *d, struct device_attribute *a,
if (value > pm->fan.max_duty)
value = pm->fan.max_duty;
if (pm->fanspeed_set)
ret = pm->fanspeed_set(dev, value);
ret = nouveau_pwmfan_set(dev, value);
if (ret)
return ret;
@ -660,7 +722,7 @@ nouveau_hwmon_init(struct drm_device *dev)
/*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) {
if (nouveau_pwmfan_get(dev) >= 0) {
ret = sysfs_create_group(&dev->pdev->dev.kobj,
&hwmon_pwm_fan_attrgroup);
if (ret)