drm/nouveau/therm: rework thermal table parsing

As an accident, it should also fix temperature reading on nv4x.

v2: introduce nvbios_therm_entry as advised by darktama

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

drivers/gpu/drm/nouveau/Makefile

@@ -35,6 +35,7 @@ nouveau-y += core/subdev/bios/i2c.o
 nouveau-y += core/subdev/bios/init.o
 nouveau-y += core/subdev/bios/mxm.o
 nouveau-y += core/subdev/bios/pll.o
+nouveau-y += core/subdev/bios/therm.o
 nouveau-y += core/subdev/clock/nv04.o
 nouveau-y += core/subdev/clock/nv40.o
 nouveau-y += core/subdev/clock/nv50.o

drivers/gpu/drm/nouveau/core/include/subdev/bios/therm.h

@@ -0,0 +1,46 @@
+#ifndef __NVBIOS_THERM_H__
+#define __NVBIOS_THERM_H__
+
+struct nouveau_bios;
+
+struct nvbios_therm_threshold {
+	u8 temp;
+	u8 hysteresis;
+};
+
+struct nvbios_therm_sensor {
+	/* diode */
+	s16 slope_mult;
+	s16 slope_div;
+	s16 offset_num;
+	s16 offset_den;
+	s8 offset_constant;
+
+	/* thresholds */
+	struct nvbios_therm_threshold thrs_fan_boost;
+	struct nvbios_therm_threshold thrs_down_clock;
+	struct nvbios_therm_threshold thrs_critical;
+	struct nvbios_therm_threshold thrs_shutdown;
+};
+
+struct nvbios_therm_fan {
+	u16 pwm_freq;
+
+	u8 min_duty;
+	u8 max_duty;
+};
+
+enum nvbios_therm_domain {
+	NVBIOS_THERM_DOMAIN_CORE,
+	NVBIOS_THERM_DOMAIN_AMBIENT,
+};
+
+int
+nvbios_therm_sensor_parse(struct nouveau_bios *, enum nvbios_therm_domain,
+			  struct nvbios_therm_sensor *);
+
+int
+nvbios_therm_fan_parse(struct nouveau_bios *, struct nvbios_therm_fan *);
+
+
+#endif

drivers/gpu/drm/nouveau/core/subdev/bios/therm.c

@@ -0,0 +1,177 @@
+/*
+ * Copyright 2012 Nouveau Community
+ *
+ * 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 <subdev/bios.h>
+#include <subdev/bios/bit.h>
+#include <subdev/bios/therm.h>
+
+static u16
+therm_table(struct nouveau_bios *bios, u8 *ver, u8 *hdr, u8 *len, u8 *cnt)
+{
+	struct bit_entry bit_P;
+	u16 therm = 0;
+
+	if (!bit_entry(bios, 'P', &bit_P)) {
+		if (bit_P.version == 1)
+			therm = nv_ro16(bios, bit_P.offset + 12);
+		else if (bit_P.version == 2)
+			therm = nv_ro16(bios, bit_P.offset + 16);
+		else
+			nv_error(bios,
+				"unknown offset for thermal in BIT P %d\n",
+				bit_P.version);
+	}
+
+	/* exit now if we haven't found the thermal table */
+	if (!therm)
+		return 0x0000;
+
+	*ver = nv_ro08(bios, therm + 0);
+	*hdr = nv_ro08(bios, therm + 1);
+	*len = nv_ro08(bios, therm + 2);
+	*cnt = nv_ro08(bios, therm + 3);
+
+	return therm + nv_ro08(bios, therm + 1);
+}
+
+u16
+nvbios_therm_entry(struct nouveau_bios *bios, int idx, u8 *ver, u8 *len)
+{
+	u8 hdr, cnt;
+	u16 therm = therm_table(bios, ver, &hdr, len, &cnt);
+	if (therm && idx < cnt)
+		return therm + idx * *len;
+	return 0x0000;
+}
+
+int
+nvbios_therm_sensor_parse(struct nouveau_bios *bios,
+			  enum nvbios_therm_domain domain,
+			  struct nvbios_therm_sensor *sensor)
+{
+	s8 thrs_section, sensor_section, offset;
+	u8 ver, len, i;
+	u16 entry;
+
+	/* we only support the core domain for now */
+	if (domain != NVBIOS_THERM_DOMAIN_CORE)
+		return -EINVAL;
+
+	/* Read the entries from the table */
+	thrs_section = 0;
+	sensor_section = -1;
+	i = 0;
+	while ((entry = nvbios_therm_entry(bios, i++, &ver, &len))) {
+		s16 value = nv_ro16(bios, entry + 1);
+
+		switch (nv_ro08(bios, entry + 0)) {
+		case 0x0:
+			thrs_section = value;
+			if (value > 0)
+				return 0; /* we do not try to support ambient */
+			break;
+		case 0x01:
+			sensor_section++;
+			if (sensor_section == 0) {
+				offset = ((s8) nv_ro08(bios, entry + 2)) / 2;
+				sensor->offset_constant = offset;
+			}
+			break;
+
+		case 0x04:
+			if (thrs_section == 0) {
+				sensor->thrs_critical.temp = (value & 0xff0) >> 4;
+				sensor->thrs_critical.hysteresis = value & 0xf;
+			}
+			break;
+
+		case 0x07:
+			if (thrs_section == 0) {
+				sensor->thrs_down_clock.temp = (value & 0xff0) >> 4;
+				sensor->thrs_down_clock.hysteresis = value & 0xf;
+			}
+			break;
+
+		case 0x08:
+			if (thrs_section == 0) {
+				sensor->thrs_fan_boost.temp = (value & 0xff0) >> 4;
+				sensor->thrs_fan_boost.hysteresis = value & 0xf;
+			}
+			break;
+
+		case 0x10:
+			if (sensor_section == 0)
+				sensor->offset_num = value;
+			break;
+
+		case 0x11:
+			if (sensor_section == 0)
+				sensor->offset_den = value;
+			break;
+
+		case 0x12:
+			if (sensor_section == 0)
+				sensor->slope_mult = value;
+			break;
+
+		case 0x13:
+			if (sensor_section == 0)
+				sensor->slope_div = value;
+			break;
+		case 0x32:
+			if (thrs_section == 0) {
+				sensor->thrs_shutdown.temp = (value & 0xff0) >> 4;
+				sensor->thrs_shutdown.hysteresis = value & 0xf;
+			}
+			break;
+		}
+	}
+
+	return 0;
+}
+
+int
+nvbios_therm_fan_parse(struct nouveau_bios *bios,
+			  struct nvbios_therm_fan *fan)
+{
+	u8 ver, len, i;
+	u16 entry;
+
+	i = 0;
+	while ((entry = nvbios_therm_entry(bios, i++, &ver, &len))) {
+		s16 value = nv_ro16(bios, entry + 1);
+
+		switch (nv_ro08(bios, entry + 0)) {
+		case 0x22:
+			fan->min_duty = value & 0xff;
+			fan->max_duty = (value & 0xff00) >> 8;
+			break;
+		case 0x26:
+			fan->pwm_freq = value;
+			break;
+		}
+	}
+
+	return 0;
+}

drivers/gpu/drm/nouveau/nouveau_pm.c

@@ -891,10 +891,7 @@ nouveau_pm_init(struct drm_device *dev)
 		}
 		pm->voltage_get = nouveau_voltage_gpio_get;
 		pm->voltage_set = nouveau_voltage_gpio_set;
-		if (device->chipset == 0x50)
-			pm->temp_get = nv40_temp_get;
-		else
-			pm->temp_get = nv84_temp_get;
+		pm->temp_get = nv84_temp_get;
 		pm->pwm_get = nv50_pm_pwm_get;
 		pm->pwm_set = nv50_pm_pwm_set;
 	} else

drivers/gpu/drm/nouveau/nouveau_pm.h

@@ -148,7 +148,6 @@ struct nouveau_pm_temp_sensor_constants {
 struct nouveau_pm_threshold_temp {
 	s16 critical;
 	s16 down_clock;
-	s16 fan_boost;
 };
 
 struct nouveau_pm_fan {