drm/radeon/kms/pm: Disable voltage adjust on RS780/RS880

The vddc value in the power tables is not an actual voltage
like on discrete r6xx/r7xx/evergreen systems, but instead has
a symbolic meaning (e.g., NONE, LOW, HIGH, etc.).  See atombios.h

Most RS780/RS880 vbioses don't have a SetVoltage table anyway,
so it shouldn't be doing anything to the hardware at the moment.

I need to figure out how voltage is supposed to work on the newer
IGPs; until then, disable it.

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

1 files changed, 1 insertions, 4 deletions

diff --git a/drivers/gpu/drm/radeon/radeon_atombios.c b/drivers/gpu/drm/radeon/radeon_atombios.c
index 4305cd55d0ac..f0fcd6c3d38c 100644
--- a/drivers/gpu/drm/radeon/radeon_atombios.c
+++ b/drivers/gpu/drm/radeon/radeon_atombios.c
@@ -1833,10 +1833,7 @@ void radeon_atombios_get_power_modes(struct radeon_device *rdev)
                                                 /* skip invalid modes */
                                                 if (rdev->pm.power_state[state_index].clock_info[mode_index].sclk == 0)
                                                         continue;
-                                                rdev->pm.power_state[state_index].clock_info[mode_index].voltage.type =
-                                                        VOLTAGE_SW;
-                                                rdev->pm.power_state[state_index].clock_info[mode_index].voltage.voltage =
-                                                        clock_info->usVDDC;
+                                                /* voltage works differently on IGPs */
                                                 mode_index++;
                                         } else if (ASIC_IS_DCE4(rdev)) {
                                                 struct _ATOM_PPLIB_EVERGREEN_CLOCK_INFO *clock_info =