Patch "drm/amdgpu/ci: disable mclk switching for high refresh rates (v2)" has been added to the 4.4-stable tree

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This is a note to let you know that I've just added the patch titled

    drm/amdgpu/ci: disable mclk switching for high refresh rates (v2)

to the 4.4-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     drm-amdgpu-ci-disable-mclk-switching-for-high-refresh-rates-v2.patch
and it can be found in the queue-4.4 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.


>From 0a646f331db0eb9efc8d3a95a44872036d441d58 Mon Sep 17 00:00:00 2001
From: Alex Deucher <alexander.deucher@xxxxxxx>
Date: Thu, 11 May 2017 13:10:02 -0400
Subject: drm/amdgpu/ci: disable mclk switching for high refresh rates (v2)
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

From: Alex Deucher <alexander.deucher@xxxxxxx>

commit 0a646f331db0eb9efc8d3a95a44872036d441d58 upstream.

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

v2: fix logic inversion (Nils)

bug: https://bugs.freedesktop.org/show_bug.cgi?id=96868

Acked-by: Christian König <christian.koenig@xxxxxxx>
Signed-off-by: Alex Deucher <alexander.deucher@xxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
 drivers/gpu/drm/amd/amdgpu/ci_dpm.c |    6 ++++++
 1 file changed, 6 insertions(+)

--- a/drivers/gpu/drm/amd/amdgpu/ci_dpm.c
+++ b/drivers/gpu/drm/amd/amdgpu/ci_dpm.c
@@ -893,6 +893,12 @@ static bool ci_dpm_vblank_too_short(stru
 	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


Patches currently in stable-queue which might be from alexander.deucher@xxxxxxx are

queue-4.4/drm-amdgpu-ci-disable-mclk-switching-for-high-refresh-rates-v2.patch



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