drm/nouveau: Add temperature support (vbios parsing, readings, hwmon)

Signed-off-by: Martin Peres <martin.peres@ensi-bourges.fr>
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

5 files changed, 518 insertions, 39 deletions

diff --git a/drivers/gpu/drm/nouveau/Makefile b/drivers/gpu/drm/nouveau/Makefile
index 3cedabeb1617..bdbde726778e 100644
--- a/drivers/gpu/drm/nouveau/Makefile
+++ b/drivers/gpu/drm/nouveau/Makefile
@@ -25,7 +25,7 @@ nouveau-y := nouveau_drv.o nouveau_state.o nouveau_channel.o nouveau_mem.o \
              nv04_crtc.o nv04_display.o nv04_cursor.o nv04_fbcon.o \
              nv10_gpio.o nv50_gpio.o \
              nv50_calc.o \
-             nv04_pm.o nv50_pm.o
+             nv04_pm.o nv50_pm.o nouveau_temp.o
 
 nouveau-$(CONFIG_DRM_NOUVEAU_DEBUG) += nouveau_debugfs.o
 nouveau-$(CONFIG_COMPAT) += nouveau_ioc32.o
diff --git a/drivers/gpu/drm/nouveau/nouveau_drv.h b/drivers/gpu/drm/nouveau/nouveau_drv.h
index 8d36ed6907d1..3fc5596df360 100644
--- a/drivers/gpu/drm/nouveau/nouveau_drv.h
+++ b/drivers/gpu/drm/nouveau/nouveau_drv.h
@@ -387,10 +387,26 @@ struct nouveau_pm_level {
         u8 fanspeed;
 };
 
+struct nouveau_pm_temp_sensor_constants {
+        u16 offset_constant;
+        s16 offset_mult;
+        u16 offset_div;
+        u16 slope_mult;
+        u16 slope_div;
+};
+
+struct nouveau_pm_threshold_temp {
+        s16 critical;
+        s16 down_clock;
+        s16 fan_boost;
+};
+
 struct nouveau_pm_engine {
         struct nouveau_pm_voltage voltage;
         struct nouveau_pm_level perflvl[NOUVEAU_PM_MAX_LEVEL];
         int nr_perflvl;
+        struct nouveau_pm_temp_sensor_constants sensor_constants;
+        struct nouveau_pm_threshold_temp threshold_temp;
 
         struct nouveau_pm_level boot;
         struct nouveau_pm_level *cur;
@@ -663,6 +679,8 @@ struct drm_nouveau_private {
 
         struct nouveau_fbdev *nfbdev;
         struct apertures_struct *apertures;
+
+        struct device *int_hwmon_dev;
 };
 
 static inline struct drm_nouveau_private *
diff --git a/drivers/gpu/drm/nouveau/nouveau_pm.c b/drivers/gpu/drm/nouveau/nouveau_pm.c
index a07f27447cf9..09b638435f8f 100644
--- a/drivers/gpu/drm/nouveau/nouveau_pm.c
+++ b/drivers/gpu/drm/nouveau/nouveau_pm.c
@@ -27,6 +27,9 @@
 #include "nouveau_drv.h"
 #include "nouveau_pm.h"
 
+#include <linux/hwmon.h>
+#include <linux/hwmon-sysfs.h>
+
 static int
 nouveau_pm_clock_set(struct drm_device *dev, u8 id, u32 khz)
 {
@@ -189,7 +192,7 @@ nouveau_pm_get_perflvl_info(struct device *d,
 static ssize_t
 nouveau_pm_get_perflvl(struct device *d, struct device_attribute *a, char *buf)
 {
-        struct drm_device *dev = pci_get_drvdata(to_pci_dev(d));
+        struct drm_device *dev = pci_get_drvdata(to_pci_dev(d));
         struct drm_nouveau_private *dev_priv = dev->dev_private;
         struct nouveau_pm_engine *pm = &dev_priv->engine.pm;
         struct nouveau_pm_level cur;
@@ -215,7 +218,7 @@ static ssize_t
 nouveau_pm_set_perflvl(struct device *d, struct device_attribute *a,
                        const char *buf, size_t count)
 {
-        struct drm_device *dev = pci_get_drvdata(to_pci_dev(d));
+        struct drm_device *dev = pci_get_drvdata(to_pci_dev(d));
         int ret;
 
         ret = nouveau_pm_profile_set(dev, buf);
@@ -227,43 +230,14 @@ nouveau_pm_set_perflvl(struct device *d, struct device_attribute *a,
 DEVICE_ATTR(performance_level, S_IRUGO | S_IWUSR,
             nouveau_pm_get_perflvl, nouveau_pm_set_perflvl);
 
-int
-nouveau_pm_init(struct drm_device *dev)
+static int
+nouveau_sysfs_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 *d = &dev->pdev->dev;
-        char info[256];
         int ret, i;
 
-        nouveau_volt_init(dev);
-        nouveau_perf_init(dev);
-
-        NV_INFO(dev, "%d available performance level(s)\n", pm->nr_perflvl);
-        for (i = 0; i < pm->nr_perflvl; i++) {
-                nouveau_pm_perflvl_info(&pm->perflvl[i], info, sizeof(info));
-                NV_INFO(dev, "%d: %s", pm->perflvl[i].id, info);
-        }
-
-        /* determine current ("boot") performance level */
-        ret = nouveau_pm_perflvl_get(dev, &pm->boot);
-        if (ret == 0) {
-                pm->cur = &pm->boot;
-
-                nouveau_pm_perflvl_info(&pm->boot, info, sizeof(info));
-                NV_INFO(dev, "c: %s", info);
-        }
-
-        /* switch performance levels now if requested */
-        if (nouveau_perflvl != NULL) {
-                ret = nouveau_pm_profile_set(dev, nouveau_perflvl);
-                if (ret) {
-                        NV_ERROR(dev, "error setting perflvl \"%s\": %d\n",
-                                 nouveau_perflvl, ret);
-                }
-        }
-
-        /* initialise sysfs */
         ret = device_create_file(d, &dev_attr_performance_level);
         if (ret)
                 return ret;
@@ -290,17 +264,14 @@ nouveau_pm_init(struct drm_device *dev)
         return 0;
 }
 
-void
-nouveau_pm_fini(struct drm_device *dev)
+static void
+nouveau_sysfs_fini(struct drm_device *dev)
 {
         struct drm_nouveau_private *dev_priv = dev->dev_private;
         struct nouveau_pm_engine *pm = &dev_priv->engine.pm;
         struct device *d = &dev->pdev->dev;
         int i;
 
-        if (pm->cur != &pm->boot)
-                nouveau_pm_perflvl_set(dev, &pm->boot);
-
         device_remove_file(d, &dev_attr_performance_level);
         for (i = 0; i < pm->nr_perflvl; i++) {
                 struct nouveau_pm_level *pl = &pm->perflvl[i];
@@ -310,9 +281,221 @@ nouveau_pm_fini(struct drm_device *dev)
 
                 device_remove_file(d, &pl->dev_attr);
         }
+}
+
+
+
+static ssize_t
+nouveau_hwmon_show_temp(struct device *d, struct device_attribute *a, char *buf)
+{
+        struct drm_device *dev = dev_get_drvdata(d);
+
+        return snprintf(buf, PAGE_SIZE, "%d\n", nouveau_temp_get(dev)*1000);
+}
+static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, nouveau_hwmon_show_temp,
+                                                  NULL, 0);
+
+static ssize_t
+nouveau_hwmon_max_temp(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;
+        struct nouveau_pm_threshold_temp *temp = &pm->threshold_temp;
+
+        return snprintf(buf, PAGE_SIZE, "%d\n", temp->down_clock*1000);
+}
+static ssize_t
+nouveau_hwmon_set_max_temp(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;
+        struct nouveau_pm_threshold_temp *temp = &pm->threshold_temp;
+        long value;
+
+        if (strict_strtoul(buf, 10, &value) == -EINVAL)
+                return count;
+
+        temp->down_clock = value/1000;
+
+        nouveau_temp_safety_checks(dev);
+
+        return count;
+}
+static SENSOR_DEVICE_ATTR(temp1_max, S_IRUGO | S_IWUSR, nouveau_hwmon_max_temp,
+                                                  nouveau_hwmon_set_max_temp,
+                                                  0);
+
+static ssize_t
+nouveau_hwmon_critical_temp(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;
+        struct nouveau_pm_threshold_temp *temp = &pm->threshold_temp;
+
+        return snprintf(buf, PAGE_SIZE, "%d\n", temp->critical*1000);
+}
+static ssize_t
+nouveau_hwmon_set_critical_temp(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;
+        struct nouveau_pm_threshold_temp *temp = &pm->threshold_temp;
+        long value;
+
+        if (strict_strtoul(buf, 10, &value) == -EINVAL)
+                return count;
+
+        temp->critical = value/1000;
+
+        nouveau_temp_safety_checks(dev);
+
+        return count;
+}
+static SENSOR_DEVICE_ATTR(temp1_crit, S_IRUGO | S_IWUSR,
+                                                nouveau_hwmon_critical_temp,
+                                                nouveau_hwmon_set_critical_temp,
+                                                0);
+
+static ssize_t nouveau_hwmon_show_name(struct device *dev,
+                                      struct device_attribute *attr,
+                                      char *buf)
+{
+        return sprintf(buf, "nouveau\n");
+}
+static SENSOR_DEVICE_ATTR(name, S_IRUGO, nouveau_hwmon_show_name, NULL, 0);
+
+static ssize_t nouveau_hwmon_show_update_rate(struct device *dev,
+                                      struct device_attribute *attr,
+                                      char *buf)
+{
+        return sprintf(buf, "1000\n");
+}
+static SENSOR_DEVICE_ATTR(update_rate, S_IRUGO,
+                                                nouveau_hwmon_show_update_rate,
+                                                NULL, 0);
+
+static struct attribute *hwmon_attributes[] = {
+        &sensor_dev_attr_temp1_input.dev_attr.attr,
+        &sensor_dev_attr_temp1_max.dev_attr.attr,
+        &sensor_dev_attr_temp1_crit.dev_attr.attr,
+        &sensor_dev_attr_name.dev_attr.attr,
+        &sensor_dev_attr_update_rate.dev_attr.attr,
+        NULL
+};
+
+static const struct attribute_group hwmon_attrgroup = {
+        .attrs = hwmon_attributes,
+};
+
+static int
+nouveau_hwmon_init(struct drm_device *dev)
+{
+        struct drm_nouveau_private *dev_priv = dev->dev_private;
+        struct device *hwmon_dev;
+        int ret;
+
+        dev_priv->int_hwmon_dev = NULL;
+
+        hwmon_dev = hwmon_device_register(&dev->pdev->dev);
+        if (IS_ERR(hwmon_dev)) {
+                ret = PTR_ERR(hwmon_dev);
+                NV_ERROR(dev,
+                        "Unable to register hwmon device: %d\n", ret);
+                return ret;
+        }
+        dev_set_drvdata(hwmon_dev, dev);
+        ret = sysfs_create_group(&hwmon_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;
+        }
+
+        dev_priv->int_hwmon_dev = hwmon_dev;
+
+        return 0;
+}
+
+static void
+nouveau_hwmon_fini(struct drm_device *dev)
+{
+        struct drm_nouveau_private *dev_priv = dev->dev_private;
+
+        if (dev_priv->int_hwmon_dev) {
+                sysfs_remove_group(&dev_priv->int_hwmon_dev->kobj,
+                                                   &hwmon_attrgroup);
+                hwmon_device_unregister(dev_priv->int_hwmon_dev);
+        }
+}
+
+
+int
+nouveau_pm_init(struct drm_device *dev)
+{
+        struct drm_nouveau_private *dev_priv = dev->dev_private;
+        struct nouveau_pm_engine *pm = &dev_priv->engine.pm;
+        char info[256];
+        int ret, i;
+
+        nouveau_volt_init(dev);
+        nouveau_perf_init(dev);
+        nouveau_temp_init(dev);
+
+        NV_INFO(dev, "%d available performance level(s)\n", pm->nr_perflvl);
+        for (i = 0; i < pm->nr_perflvl; i++) {
+                nouveau_pm_perflvl_info(&pm->perflvl[i], info, sizeof(info));
+                NV_INFO(dev, "%d: %s", pm->perflvl[i].id, info);
+        }
+
+        /* determine current ("boot") performance level */
+        ret = nouveau_pm_perflvl_get(dev, &pm->boot);
+        if (ret == 0) {
+                pm->cur = &pm->boot;
+
+                nouveau_pm_perflvl_info(&pm->boot, info, sizeof(info));
+                NV_INFO(dev, "c: %s", info);
+        }
+
+        /* switch performance levels now if requested */
+        if (nouveau_perflvl != NULL) {
+                ret = nouveau_pm_profile_set(dev, nouveau_perflvl);
+                if (ret) {
+                        NV_ERROR(dev, "error setting perflvl \"%s\": %d\n",
+                                 nouveau_perflvl, ret);
+                }
+        }
+
+        nouveau_sysfs_init(dev);
+        nouveau_hwmon_init(dev);
+
+        return 0;
+}
+
+void
+nouveau_pm_fini(struct drm_device *dev)
+{
+        struct drm_nouveau_private *dev_priv = dev->dev_private;
+        struct nouveau_pm_engine *pm = &dev_priv->engine.pm;
+
+        if (pm->cur != &pm->boot)
+                nouveau_pm_perflvl_set(dev, &pm->boot);
 
         nouveau_perf_fini(dev);
         nouveau_volt_fini(dev);
+        nouveau_temp_fini(dev);
+
+        nouveau_hwmon_fini(dev);
+        nouveau_sysfs_fini(dev);
 }
 
 void
diff --git a/drivers/gpu/drm/nouveau/nouveau_pm.h b/drivers/gpu/drm/nouveau/nouveau_pm.h
index f3de5a68c41f..d048b7516b1c 100644
--- a/drivers/gpu/drm/nouveau/nouveau_pm.h
+++ b/drivers/gpu/drm/nouveau/nouveau_pm.h
@@ -52,4 +52,10 @@ int nv50_pm_clock_get(struct drm_device *, u32 id);
 void *nv50_pm_clock_pre(struct drm_device *, u32 id, int khz);
 void nv50_pm_clock_set(struct drm_device *, void *);
 
+/* nouveau_temp.c */
+void nouveau_temp_init(struct drm_device *dev);
+void nouveau_temp_fini(struct drm_device *dev);
+void nouveau_temp_safety_checks(struct drm_device *dev);
+int16_t nouveau_temp_get(struct drm_device *dev);
+
 #endif
diff --git a/drivers/gpu/drm/nouveau/nouveau_temp.c b/drivers/gpu/drm/nouveau/nouveau_temp.c
new file mode 100644
index 000000000000..3394075e4c3c
--- /dev/null
+++ b/drivers/gpu/drm/nouveau/nouveau_temp.c
@@ -0,0 +1,272 @@
+/*
+ * Copyright 2010 PathScale inc.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
+ * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+ * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ * Authors: Martin Peres
+ */
+
+#include "drmP.h"
+
+#include "nouveau_drv.h"
+#include "nouveau_pm.h"
+
+void
+nouveau_temp_vbios_parse(struct drm_device *dev, u8 *temp)
+{
+        struct drm_nouveau_private *dev_priv = dev->dev_private;
+        struct nouveau_pm_engine *pm = &dev_priv->engine.pm;
+        struct nouveau_pm_temp_sensor_constants *sensor = &pm->sensor_constants;
+        struct nouveau_pm_threshold_temp *temps = &pm->threshold_temp;
+        int i, headerlen, recordlen, entries;
+
+        if (!temp) {
+                NV_DEBUG(dev, "temperature table pointer invalid\n");
+                return;
+        }
+
+        /* Set the default sensor's contants */
+        sensor->offset_constant = 0;
+        sensor->offset_mult = 1;
+        sensor->offset_div = 1;
+        sensor->slope_mult = 1;
+        sensor->slope_div = 1;
+
+        /* Set the default temperature thresholds */
+        temps->critical = 110;
+        temps->down_clock = 100;
+        temps->fan_boost = 90;
+
+        /* Set the known default values to setup the temperature sensor */
+        if (dev_priv->card_type >= NV_40) {
+                switch (dev_priv->chipset) {
+                case 0x43:
+                        sensor->offset_mult = 32060;
+                        sensor->offset_div = 1000;
+                        sensor->slope_mult = 792;
+                        sensor->slope_div = 1000;
+                        break;
+
+                case 0x44:
+                case 0x47:
+                        sensor->offset_mult = 27839;
+                        sensor->offset_div = 1000;
+                        sensor->slope_mult = 780;
+                        sensor->slope_div = 1000;
+                        break;
+
+                case 0x46:
+                        sensor->offset_mult = -24775;
+                        sensor->offset_div = 100;
+                        sensor->slope_mult = 467;
+                        sensor->slope_div = 10000;
+                        break;
+
+                case 0x49:
+                        sensor->offset_mult = -25051;
+                        sensor->offset_div = 100;
+                        sensor->slope_mult = 458;
+                        sensor->slope_div = 10000;
+                        break;
+
+                case 0x4b:
+                        sensor->offset_mult = -24088;
+                        sensor->offset_div = 100;
+                        sensor->slope_mult = 442;
+                        sensor->slope_div = 10000;
+                        break;
+
+                case 0x50:
+                        sensor->offset_mult = -22749;
+                        sensor->offset_div = 100;
+                        sensor->slope_mult = 431;
+                        sensor->slope_div = 10000;
+                        break;
+                }
+        }
+
+        headerlen = temp[1];
+        recordlen = temp[2];
+        entries = temp[3];
+        temp = temp + headerlen;
+
+        /* Read the entries from the table */
+        for (i = 0; i < entries; i++) {
+                u16 value = ROM16(temp[1]);
+
+                switch (temp[0]) {
+                case 0x01:
+                        value = (value&0x8f) == 0 ? (value >> 9) & 0x7f : 0;
+                        sensor->offset_constant = value;
+                        break;
+
+                case 0x04:
+                        if ((value & 0xf00f) == 0xa000) /* core */
+                                temps->critical = (value&0x0ff0) >> 4;
+                        break;
+
+                case 0x07:
+                        if ((value & 0xf00f) == 0xa000) /* core */
+                                temps->down_clock = (value&0x0ff0) >> 4;
+                        break;
+
+                case 0x08:
+                        if ((value & 0xf00f) == 0xa000) /* core */
+                                temps->fan_boost = (value&0x0ff0) >> 4;
+                        break;
+
+                case 0x10:
+                        sensor->offset_mult = value;
+                        break;
+
+                case 0x11:
+                        sensor->offset_div = value;
+                        break;
+
+                case 0x12:
+                        sensor->slope_mult = value;
+                        break;
+
+                case 0x13:
+                        sensor->slope_div = value;
+                        break;
+                }
+                temp += recordlen;
+        }
+
+        nouveau_temp_safety_checks(dev);
+}
+
+static s16
+nouveau_nv40_sensor_setup(struct drm_device *dev)
+{
+        struct drm_nouveau_private *dev_priv = dev->dev_private;
+        struct nouveau_pm_engine *pm = &dev_priv->engine.pm;
+        struct nouveau_pm_temp_sensor_constants *sensor = &pm->sensor_constants;
+        u32 offset = sensor->offset_mult / sensor->offset_div;
+        u32 sensor_calibration;
+
+        /* set up the sensors */
+        sensor_calibration = 120 - offset - sensor->offset_constant;
+        sensor_calibration = sensor_calibration * sensor->slope_div /
+                                sensor->slope_mult;
+
+        if (dev_priv->chipset >= 0x46)
+                sensor_calibration |= 0x80000000;
+        else
+                sensor_calibration |= 0x10000000;
+
+        nv_wr32(dev, 0x0015b0, sensor_calibration);
+
+        /* Wait for the sensor to update */
+        msleep(5);
+
+        /* read */
+        return nv_rd32(dev, 0x0015b4);
+}
+
+s16
+nouveau_temp_get(struct drm_device *dev)
+{
+        struct drm_nouveau_private *dev_priv = dev->dev_private;
+        struct nouveau_pm_engine *pm = &dev_priv->engine.pm;
+        struct nouveau_pm_temp_sensor_constants *sensor = &pm->sensor_constants;
+
+        if (dev_priv->chipset >= 0x84) {
+                return nv_rd32(dev, 0x20400);
+        } else if (dev_priv->chipset >= 0x40) {
+                u32 offset = sensor->offset_mult / sensor->offset_div;
+                u32 core_temp;
+
+                if (dev_priv->chipset >= 0x50) {
+                        core_temp = nv_rd32(dev, 0x20008);
+                } else {
+                        core_temp = nv_rd32(dev, 0x0015b4);
+                        /* Setup the sensor if the temperature is 0 */
+                        if (core_temp == 0)
+                                core_temp = nouveau_nv40_sensor_setup(dev);
+                }
+
+                core_temp = core_temp * sensor->slope_mult / sensor->slope_div;
+                core_temp = core_temp + offset + sensor->offset_constant;
+
+                return core_temp;
+        } else {
+                NV_ERROR(dev,
+                                 "Temperature cannot be retrieved from an nv%x card\n",
+                                 dev_priv->chipset);
+                return 0;
+        }
+
+        return 0;
+}
+
+void
+nouveau_temp_safety_checks(struct drm_device *dev)
+{
+        struct drm_nouveau_private *dev_priv = dev->dev_private;
+        struct nouveau_pm_engine *pm = &dev_priv->engine.pm;
+        struct nouveau_pm_threshold_temp *temps = &pm->threshold_temp;
+
+        if (temps->critical > 120)
+                temps->critical = 120;
+        else if (temps->critical < 80)
+                temps->critical = 80;
+
+        if (temps->down_clock > 110)
+                temps->down_clock = 110;
+        else if (temps->down_clock < 60)
+                temps->down_clock = 60;
+
+        if (temps->fan_boost > 100)
+                temps->fan_boost = 100;
+        else if (temps->fan_boost < 40)
+                temps->fan_boost = 40;
+}
+
+void
+nouveau_temp_init(struct drm_device *dev)
+{
+        struct drm_nouveau_private *dev_priv = dev->dev_private;
+        struct nvbios *bios = &dev_priv->vbios;
+        struct bit_entry P;
+        u8 *temp = NULL;
+
+        if (bios->type == NVBIOS_BIT) {
+                if (bit_table(dev, 'P', &P))
+                        return;
+
+                if (P.version == 1)
+                        temp = ROMPTR(bios, P.data[12]);
+                else if (P.version == 2)
+                        temp = ROMPTR(bios, P.data[16]);
+                else
+                        NV_WARN(dev, "unknown temp for BIT P %d\n", P.version);
+        } else {
+                NV_WARN(dev, "BMP entry unknown for temperature table.\n");
+        }
+
+        nouveau_temp_vbios_parse(dev, temp);
+}
+
+void
+nouveau_temp_fini(struct drm_device *dev)
+{
+
+}