drm/radeon/kms: add support for internal thermal sensors (v3)

rv6xx/rv7xx/evergreen families supported; older asics did
not have an internal thermal sensor.

Note, not all oems use the internal thermal sensor, so it's
only exposed in cases where it is used.

Note also, that most laptops use an oem specific ACPI solution for
GPU thermal information rather than using the internal thermal
sensor directly.

v2: export millidegrees celsius, use hwmon device properly.
v3: fix Kconfig

Signed-off-by: Alex Deucher <alexdeucher@gmail.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>

10 files changed, 170 insertions, 4 deletions

diff --git a/drivers/gpu/drm/Kconfig b/drivers/gpu/drm/Kconfig
index 5b7a1a4692a0..4cab0c6397e3 100644
--- a/drivers/gpu/drm/Kconfig
+++ b/drivers/gpu/drm/Kconfig
@@ -61,6 +61,7 @@ config DRM_RADEON
         select DRM_KMS_HELPER
         select DRM_TTM
         select POWER_SUPPLY
+        select HWMON
         help
           Choose this option if you have an ATI Radeon graphics card.  There
           are both PCI and AGP versions.  You don't need to choose this to
diff --git a/drivers/gpu/drm/radeon/evergreen.c b/drivers/gpu/drm/radeon/evergreen.c
index 057192acdd36..1b7da39cc587 100644
--- a/drivers/gpu/drm/radeon/evergreen.c
+++ b/drivers/gpu/drm/radeon/evergreen.c
@@ -39,6 +39,23 @@
 static void evergreen_gpu_init(struct radeon_device *rdev);
 void evergreen_fini(struct radeon_device *rdev);
 
+/* get temperature in millidegrees */
+u32 evergreen_get_temp(struct radeon_device *rdev)
+{
+        u32 temp = (RREG32(CG_MULT_THERMAL_STATUS) & ASIC_T_MASK) >>
+                ASIC_T_SHIFT;
+        u32 actual_temp = 0;
+
+        if ((temp >> 10) & 1)
+                actual_temp = 0;
+        else if ((temp >> 9) & 1)
+                actual_temp = 255;
+        else
+                actual_temp = (temp >> 1) & 0xff;
+
+        return actual_temp * 1000;
+}
+
 void evergreen_pm_misc(struct radeon_device *rdev)
 {
         int req_ps_idx = rdev->pm.requested_power_state_index;
diff --git a/drivers/gpu/drm/radeon/evergreend.h b/drivers/gpu/drm/radeon/evergreend.h
index a1cd621780e2..9b7532dd30f7 100644
--- a/drivers/gpu/drm/radeon/evergreend.h
+++ b/drivers/gpu/drm/radeon/evergreend.h
@@ -165,6 +165,11 @@
 #define         SE_DB_BUSY                                      (1 << 30)
 #define         SE_CB_BUSY                                      (1 << 31)
 
+#define CG_MULT_THERMAL_STATUS                          0x740
+#define         ASIC_T(x)                               ((x) << 16)
+#define         ASIC_T_MASK                             0x7FF0000
+#define         ASIC_T_SHIFT                            16
+
 #define HDP_HOST_PATH_CNTL                              0x2C00
 #define HDP_NONSURFACE_BASE                             0x2C04
 #define HDP_NONSURFACE_INFO                             0x2C08
diff --git a/drivers/gpu/drm/radeon/r600.c b/drivers/gpu/drm/radeon/r600.c
index a73a6e17588d..15fe6c214034 100644
--- a/drivers/gpu/drm/radeon/r600.c
+++ b/drivers/gpu/drm/radeon/r600.c
@@ -92,6 +92,21 @@ void r600_gpu_init(struct radeon_device *rdev);
 void r600_fini(struct radeon_device *rdev);
 void r600_irq_disable(struct radeon_device *rdev);
 
+/* get temperature in millidegrees */
+u32 rv6xx_get_temp(struct radeon_device *rdev)
+{
+        u32 temp = (RREG32(CG_THERMAL_STATUS) & ASIC_T_MASK) >>
+                ASIC_T_SHIFT;
+        u32 actual_temp = 0;
+
+        if ((temp >> 7) & 1)
+                actual_temp = 0;
+        else
+                actual_temp = (temp >> 1) & 0xff;
+
+        return actual_temp * 1000;
+}
+
 void r600_pm_get_dynpm_state(struct radeon_device *rdev)
 {
         int i;
diff --git a/drivers/gpu/drm/radeon/r600d.h b/drivers/gpu/drm/radeon/r600d.h
index 59c1f8793e60..23205f032872 100644
--- a/drivers/gpu/drm/radeon/r600d.h
+++ b/drivers/gpu/drm/radeon/r600d.h
@@ -239,6 +239,11 @@
 #define GRBM_SOFT_RESET                                 0x8020
 #define         SOFT_RESET_CP                                   (1<<0)
 
+#define CG_THERMAL_STATUS                               0x7F4
+#define         ASIC_T(x)                               ((x) << 0)
+#define         ASIC_T_MASK                             0x1FF
+#define         ASIC_T_SHIFT                            0
+
 #define HDP_HOST_PATH_CNTL                              0x2C00
 #define HDP_NONSURFACE_BASE                             0x2C04
 #define HDP_NONSURFACE_INFO                             0x2C08
diff --git a/drivers/gpu/drm/radeon/radeon.h b/drivers/gpu/drm/radeon/radeon.h
index a5c1a3e9dd39..d4d776d2f1e0 100644
--- a/drivers/gpu/drm/radeon/radeon.h
+++ b/drivers/gpu/drm/radeon/radeon.h
@@ -178,6 +178,9 @@ void radeon_combios_get_power_modes(struct radeon_device *rdev);
 void radeon_atombios_get_power_modes(struct radeon_device *rdev);
 void radeon_atom_set_voltage(struct radeon_device *rdev, u16 level);
 void rs690_pm_info(struct radeon_device *rdev);
+extern u32 rv6xx_get_temp(struct radeon_device *rdev);
+extern u32 rv770_get_temp(struct radeon_device *rdev);
+extern u32 evergreen_get_temp(struct radeon_device *rdev);
 
 /*
  * Fences.
@@ -670,6 +673,13 @@ struct radeon_pm_profile {
         int dpms_on_cm_idx;
 };
 
+enum radeon_int_thermal_type {
+        THERMAL_TYPE_NONE,
+        THERMAL_TYPE_RV6XX,
+        THERMAL_TYPE_RV770,
+        THERMAL_TYPE_EVERGREEN,
+};
+
 struct radeon_voltage {
         enum radeon_voltage_type type;
         /* gpio voltage */
@@ -765,6 +775,9 @@ struct radeon_pm {
         enum radeon_pm_profile_type profile;
         int                     profile_index;
         struct radeon_pm_profile profiles[PM_PROFILE_MAX];
+        /* internal thermal controller on rv6xx+ */
+        enum radeon_int_thermal_type int_thermal_type;
+        struct device           *int_hwmon_dev;
 };
 
 
diff --git a/drivers/gpu/drm/radeon/radeon_atombios.c b/drivers/gpu/drm/radeon/radeon_atombios.c
index 99bd8a9c56b3..5dd86b95b992 100644
--- a/drivers/gpu/drm/radeon/radeon_atombios.c
+++ b/drivers/gpu/drm/radeon/radeon_atombios.c
@@ -1773,14 +1773,22 @@ void radeon_atombios_get_power_modes(struct radeon_device *rdev)
                         }
 
                         /* add the i2c bus for thermal/fan chip */
-                        /* no support for internal controller yet */
                         if (controller->ucType > 0) {
-                                if ((controller->ucType == ATOM_PP_THERMALCONTROLLER_RV6xx) ||
-                                    (controller->ucType == ATOM_PP_THERMALCONTROLLER_RV770) ||
-                                    (controller->ucType == ATOM_PP_THERMALCONTROLLER_EVERGREEN)) {
+                                if (controller->ucType == ATOM_PP_THERMALCONTROLLER_RV6xx) {
                                         DRM_INFO("Internal thermal controller %s fan control\n",
                                                  (controller->ucFanParameters &
                                                   ATOM_PP_FANPARAMETERS_NOFAN) ? "without" : "with");
+                                        rdev->pm.int_thermal_type = THERMAL_TYPE_RV6XX;
+                                } else if (controller->ucType == ATOM_PP_THERMALCONTROLLER_RV770) {
+                                        DRM_INFO("Internal thermal controller %s fan control\n",
+                                                 (controller->ucFanParameters &
+                                                  ATOM_PP_FANPARAMETERS_NOFAN) ? "without" : "with");
+                                        rdev->pm.int_thermal_type = THERMAL_TYPE_RV770;
+                                } else if (controller->ucType == ATOM_PP_THERMALCONTROLLER_EVERGREEN) {
+                                        DRM_INFO("Internal thermal controller %s fan control\n",
+                                                 (controller->ucFanParameters &
+                                                  ATOM_PP_FANPARAMETERS_NOFAN) ? "without" : "with");
+                                        rdev->pm.int_thermal_type = THERMAL_TYPE_EVERGREEN;
                                 } else if ((controller->ucType ==
                                             ATOM_PP_THERMALCONTROLLER_EXTERNAL_GPIO) ||
                                            (controller->ucType ==
diff --git a/drivers/gpu/drm/radeon/radeon_pm.c b/drivers/gpu/drm/radeon/radeon_pm.c
index 115d26b762cc..ed66062ae9d0 100644
--- a/drivers/gpu/drm/radeon/radeon_pm.c
+++ b/drivers/gpu/drm/radeon/radeon_pm.c
@@ -27,6 +27,8 @@
 #include <linux/acpi.h>
 #endif
 #include <linux/power_supply.h>
+#include <linux/hwmon.h>
+#include <linux/hwmon-sysfs.h>
 
 #define RADEON_IDLE_LOOP_MS 100
 #define RADEON_RECLOCK_DELAY_MS 200
@@ -423,6 +425,82 @@ fail:
 static DEVICE_ATTR(power_profile, S_IRUGO | S_IWUSR, radeon_get_pm_profile, radeon_set_pm_profile);
 static DEVICE_ATTR(power_method, S_IRUGO | S_IWUSR, radeon_get_pm_method, radeon_set_pm_method);
 
+static ssize_t radeon_hwmon_show_temp(struct device *dev,
+                                      struct device_attribute *attr,
+                                      char *buf)
+{
+        struct drm_device *ddev = pci_get_drvdata(to_pci_dev(dev));
+        struct radeon_device *rdev = ddev->dev_private;
+        u32 temp;
+
+        switch (rdev->pm.int_thermal_type) {
+        case THERMAL_TYPE_RV6XX:
+                temp = rv6xx_get_temp(rdev);
+                break;
+        case THERMAL_TYPE_RV770:
+                temp = rv770_get_temp(rdev);
+                break;
+        case THERMAL_TYPE_EVERGREEN:
+                temp = evergreen_get_temp(rdev);
+                break;
+        default:
+                temp = 0;
+                break;
+        }
+
+        return snprintf(buf, PAGE_SIZE, "%d\n", temp);
+}
+
+static ssize_t radeon_hwmon_show_name(struct device *dev,
+                                      struct device_attribute *attr,
+                                      char *buf)
+{
+        return sprintf(buf, "radeon\n");
+}
+
+static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, radeon_hwmon_show_temp, NULL, 0);
+static SENSOR_DEVICE_ATTR(name, S_IRUGO, radeon_hwmon_show_name, NULL, 0);
+
+static struct attribute *hwmon_attributes[] = {
+        &sensor_dev_attr_temp1_input.dev_attr.attr,
+        &sensor_dev_attr_name.dev_attr.attr,
+        NULL
+};
+
+static const struct attribute_group hwmon_attrgroup = {
+        .attrs = hwmon_attributes,
+};
+
+static void radeon_hwmon_init(struct radeon_device *rdev)
+{
+        int err;
+
+        rdev->pm.int_hwmon_dev = NULL;
+
+        switch (rdev->pm.int_thermal_type) {
+        case THERMAL_TYPE_RV6XX:
+        case THERMAL_TYPE_RV770:
+        case THERMAL_TYPE_EVERGREEN:
+                rdev->pm.int_hwmon_dev = hwmon_device_register(rdev->dev);
+                dev_set_drvdata(rdev->pm.int_hwmon_dev, rdev->ddev);
+                err = sysfs_create_group(&rdev->pm.int_hwmon_dev->kobj,
+                                         &hwmon_attrgroup);
+                if (err)
+                        DRM_ERROR("Unable to create hwmon sysfs file: %d\n", err);
+                break;
+        default:
+                break;
+        }
+}
+
+static void radeon_hwmon_fini(struct radeon_device *rdev)
+{
+        if (rdev->pm.int_hwmon_dev) {
+                sysfs_remove_group(&rdev->pm.int_hwmon_dev->kobj, &hwmon_attrgroup);
+                hwmon_device_unregister(rdev->pm.int_hwmon_dev);
+        }
+}
+
 void radeon_pm_suspend(struct radeon_device *rdev)
 {
         bool flush_wq = false;
@@ -470,6 +548,7 @@ int radeon_pm_init(struct radeon_device *rdev)
         rdev->pm.dynpm_can_downclock = true;
         rdev->pm.current_sclk = rdev->clock.default_sclk;
         rdev->pm.current_mclk = rdev->clock.default_mclk;
+        rdev->pm.int_thermal_type = THERMAL_TYPE_NONE;
 
         if (rdev->bios) {
                 if (rdev->is_atom_bios)
@@ -480,6 +559,8 @@ int radeon_pm_init(struct radeon_device *rdev)
                 radeon_pm_init_profile(rdev);
         }
 
+        /* set up the internal thermal sensor if applicable */
+        radeon_hwmon_init(rdev);
         if (rdev->pm.num_power_states > 1) {
                 /* where's the best place to put these? */
                 ret = device_create_file(rdev->dev, &dev_attr_power_profile);
@@ -535,6 +616,7 @@ void radeon_pm_fini(struct radeon_device *rdev)
 #endif
         }
 
+        radeon_hwmon_fini(rdev);
         if (rdev->pm.i2c_bus)
                 radeon_i2c_destroy(rdev->pm.i2c_bus);
 }
diff --git a/drivers/gpu/drm/radeon/rv770.c b/drivers/gpu/drm/radeon/rv770.c
index 6a7bf1091971..836c15ab84d1 100644
--- a/drivers/gpu/drm/radeon/rv770.c
+++ b/drivers/gpu/drm/radeon/rv770.c
@@ -42,6 +42,21 @@
 static void rv770_gpu_init(struct radeon_device *rdev);
 void rv770_fini(struct radeon_device *rdev);
 
+/* get temperature in millidegrees */
+u32 rv770_get_temp(struct radeon_device *rdev)
+{
+        u32 temp = (RREG32(CG_MULT_THERMAL_STATUS) & ASIC_T_MASK) >>
+                ASIC_T_SHIFT;
+        u32 actual_temp = 0;
+
+        if ((temp >> 9) & 1)
+                actual_temp = 0;
+        else
+                actual_temp = (temp >> 1) & 0xff;
+
+        return actual_temp * 1000;
+}
+
 void rv770_pm_misc(struct radeon_device *rdev)
 {
         int req_ps_idx = rdev->pm.requested_power_state_index;
diff --git a/drivers/gpu/drm/radeon/rv770d.h b/drivers/gpu/drm/radeon/rv770d.h
index 9506f8cb99e0..fd733f268e3d 100644
--- a/drivers/gpu/drm/radeon/rv770d.h
+++ b/drivers/gpu/drm/radeon/rv770d.h
@@ -122,6 +122,11 @@
 #define         GUI_ACTIVE                                      (1<<31)
 #define GRBM_STATUS2                                    0x8014
 
+#define CG_MULT_THERMAL_STATUS                          0x740
+#define         ASIC_T(x)                               ((x) << 16)
+#define         ASIC_T_MASK                             0x3FF0000
+#define         ASIC_T_SHIFT                            16
+
 #define HDP_HOST_PATH_CNTL                              0x2C00
 #define HDP_NONSURFACE_BASE                             0x2C04
 #define HDP_NONSURFACE_INFO                             0x2C08