drm/radeon/kms/pm: track current voltage (v2)

track the current voltage level and avoid setting it
if the requested voltage is already set.

v2: check voltage type before checking current voltage

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

1 files changed, 7 insertions, 2 deletions

diff --git a/drivers/gpu/drm/radeon/rv770.c b/drivers/gpu/drm/radeon/rv770.c
index 33952da65340..7bde6eecf8c2 100644
--- a/drivers/gpu/drm/radeon/rv770.c
+++ b/drivers/gpu/drm/radeon/rv770.c
@@ -48,8 +48,13 @@ void rv770_pm_misc(struct radeon_device *rdev)
         struct radeon_power_state *ps = &rdev->pm.power_state[requested_index];
         struct radeon_voltage *voltage = &ps->clock_info[0].voltage;
 
-        if ((voltage->type == VOLTAGE_SW) && voltage->voltage)
-                radeon_atom_set_voltage(rdev, voltage->voltage);
+
+        if ((voltage->type == VOLTAGE_SW) && voltage->voltage) {
+                if (voltage->voltage != rdev->pm.current_vddc) {
+                        radeon_atom_set_voltage(rdev, voltage->voltage);
+                        rdev->pm.current_vddc = voltage->voltage;
+                }
+        }
 }
 
 /*