drm/radeon/kms/r6xx+: voltage fixes

0xff01 is not an actual voltage value, but a flag
for the driver.  If the power state as that value,
skip setting the voltage.

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

1 files changed, 3 insertions, 0 deletions

diff --git a/drivers/gpu/drm/radeon/r600.c b/drivers/gpu/drm/radeon/r600.c
index dc9fde38ef49..f79d2ccb6755 100644
--- a/drivers/gpu/drm/radeon/r600.c
+++ b/drivers/gpu/drm/radeon/r600.c
@@ -590,6 +590,9 @@ void r600_pm_misc(struct radeon_device *rdev)
         struct radeon_voltage *voltage = &ps->clock_info[req_cm_idx].voltage;
 
         if ((voltage->type == VOLTAGE_SW) && voltage->voltage) {
+                /* 0xff01 is a flag rather then an actual voltage */
+                if (voltage->voltage == 0xff01)
+                        return;
                 if (voltage->voltage != rdev->pm.current_vddc) {
                         radeon_atom_set_voltage(rdev, voltage->voltage, SET_VOLTAGE_TYPE_ASIC_VDDC);
                         rdev->pm.current_vddc = voltage->voltage;