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

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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>
This commit is contained in:
Alex Deucher
2010-07-02 12:58:16 -04:00
committed by Dave Airlie
parent d7a2952f1a
commit 21a8122ad3
10 changed files with 170 additions and 4 deletions
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15
drivers/gpu/drm/radeon/rv770.c
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@@ -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;