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>

1 files changed, 13 insertions, 0 deletions

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;
 };