FAILED: patch "[PATCH] drm/amdgpu/ci: disable mclk switching for high refresh rates" failed to apply to 4.12-stable tree

The patch below does not apply to the 4.12-stable tree.
If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to <[email protected]>.

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From: Alex Deucher <[email protected]>
Date: Thu, 11 May 2017 13:10:02 -0400
Subject: [PATCH] drm/amdgpu/ci: disable mclk switching for high refresh rates
(v2)
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Even if the vblank period would allow it, it still seems to be problematic on some cards.

v2: fix logic inversion (Nils)

index 6dc1410b380f..ec93714e4524 100644
@@ -906,6 +906,12 @@ static bool ci_dpm_vblank_too_short(struct amdgpu_device *adev)
 	u32 vblank_time = amdgpu_dpm_get_vblank_time(adev);
 	u32 switch_limit = adev->mc.vram_type == AMDGPU_VRAM_TYPE_GDDR5 ? 450 : 300;
 
+	/* disable mclk switching if the refresh is >120Hz, even if the
+	 * blanking period would allow it
+	 */
+	if (amdgpu_dpm_get_vrefresh(adev) > 120)
+		return true;
+
 	if (vblank_time < switch_limit)
 		return true;
 	else