vblank_time_us = vblank_in_pixels * 1000 / amdgpu_crtc->hw_mode.clock;
+
+				/* we have issues with mclk switching with
+				 * refresh rates over 120 hz on the non-DC code.
+				 */
+				if (drm_mode_vrefresh(&amdgpu_crtc->hw_mode) > 120)
+					vblank_time_us = 0;
+
 				break;
 			}
 		}
-- 
2.51.0[PATCH 6.17 307/563] drm/amd/pm: Disable MCLK switching with non-DC at 120 Hz+ (v2)Greg Kroah-Hartman <gregkh@linuxfoundation.org> undefinedstable@vger.kernel.org undefined undefined undefined undefined undefined‘5ƒ˜