If there are no displays attached, there is no reason to disable
mclk switching.

Signed-off-by: Alex Deucher <alexander.deuc...@amd.com>
---
 drivers/gpu/drm/amd/powerplay/hwmgr/vega10_hwmgr.c | 11 +++++++----
 1 file changed, 7 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/amd/powerplay/hwmgr/vega10_hwmgr.c 
b/drivers/gpu/drm/amd/powerplay/hwmgr/vega10_hwmgr.c
index 6a153ad1b942..1d442a498bf6 100644
--- a/drivers/gpu/drm/amd/powerplay/hwmgr/vega10_hwmgr.c
+++ b/drivers/gpu/drm/amd/powerplay/hwmgr/vega10_hwmgr.c
@@ -3171,10 +3171,13 @@ static int vega10_apply_state_adjust_rules(struct 
pp_hwmgr *hwmgr,
                PP_CAP(PHM_PlatformCaps_DisableMclkSwitchForVR);
        force_mclk_high = PP_CAP(PHM_PlatformCaps_ForceMclkHigh);
 
-       disable_mclk_switching = (info.display_count > 1) ||
-                                   disable_mclk_switching_for_frame_lock ||
-                                   disable_mclk_switching_for_vr ||
-                                   force_mclk_high;
+       if (info.display_count == 0)
+               disable_mclk_switching = false;
+       else
+               disable_mclk_switching = (info.display_count > 1) ||
+                       disable_mclk_switching_for_frame_lock ||
+                       disable_mclk_switching_for_vr ||
+                       force_mclk_high;
 
        sclk = vega10_ps->performance_levels[0].gfx_clock;
        mclk = vega10_ps->performance_levels[0].mem_clock;
-- 
2.13.6

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