drm/amd/powerplay/smu7: disable mclk switching for high refresh rates

commit 2275a3a2 upstream.

Even if the vblank period would allow it, it still seems to
be problematic on some cards.

bug: https://bugs.freedesktop.org/show_bug.cgi?id=96868Acked-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/gpu/drm/amd/powerplay/hwmgr/smu7_hwmgr.c

@@ -2794,7 +2794,8 @@ static int smu7_apply_state_adjust_rules(struct pp_hwmgr *hwmgr,
 
 	disable_mclk_switching = ((1 < info.display_count) ||
 				  disable_mclk_switching_for_frame_lock ||
-				  smu7_vblank_too_short(hwmgr, mode_info.vblank_time_us));
+				  smu7_vblank_too_short(hwmgr, mode_info.vblank_time_us) ||
+				  (mode_info.refresh_rate > 120));
 
 	sclk = smu7_ps->performance_levels[0].engine_clock;
 	mclk = smu7_ps->performance_levels[0].memory_clock;