Patch "drm/amdgpu: fix vblank_time when displays are off" has been added to the 4.12-stable tree

Patch "drm/amdgpu: fix vblank_time when displays are off" has been added to the 4.12-stable tree

[gregkh]

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

    drm/amdgpu: fix vblank_time when displays are off

to the 4.12-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-fix-vblank_time-when-displays-are-off.patch
and it can be found in the queue-4.12 subdirectory.

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


>From beb3777682d5c296cc15a2a424f5a7a98476def0 Mon Sep 17 00:00:00 2001
From: Alex Deucher <alexander.deucher@amd.com>
Date: Thu, 29 Jun 2017 16:08:49 -0400
Subject: drm/amdgpu: fix vblank_time when displays are off
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

From: Alex Deucher <alexander.deucher@amd.com>

commit beb3777682d5c296cc15a2a424f5a7a98476def0 upstream.

If the displays are off, set the vblank time to max to make
sure mclk switching is enabled.  Avoid mclk getting set
to high when no displays are attached.

bug: https://bugs.freedesktop.org/show_bug.cgi?id=101528
fixes: 09be4a5219 (drm/amd/powerplay/smu7: add vblank check for mclk switching (v2))
Reviewed-by: Michel Dänzer <michel.daenzer@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/gpu/drm/amd/amdgpu/amdgpu_cgs.c |    3 +++
 1 file changed, 3 insertions(+)

--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_cgs.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_cgs.c
@@ -838,6 +838,9 @@ static int amdgpu_cgs_get_active_display
 		return -EINVAL;
 
 	mode_info = info->mode_info;
+	if (mode_info)
+		/* if the displays are off, vblank time is max */
+		mode_info->vblank_time_us = 0xffffffff;
 
 	if (adev->mode_info.num_crtc && adev->mode_info.mode_config_initialized) {
 		list_for_each_entry(crtc,


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

queue-4.12/drm-amd-amdgpu-return-error-if-initiating-read-out-of-range-on-vram.patch
queue-4.12/drm-radeon-fix-edp-for-single-display-imac10-1-v2.patch
queue-4.12/drm-amdgpu-gfx8-drop-per-apu-cu-limits.patch
queue-4.12/drm-amdgpu-cgs-always-set-reference-clock-in-mode_info.patch
queue-4.12/drm-amdgpu-don-t-call-amd_powerplay_destroy-if-we-don-t-have-powerplay.patch
queue-4.12/drm-radeon-ci-disable-mclk-switching-for-high-refresh-rates-v2.patch
queue-4.12/drm-amdgpu-fix-the-memory-corruption-on-s3.patch
queue-4.12/drm-amdgpu-fix-vblank_time-when-displays-are-off.patch
queue-4.12/drm-ttm-fix-use-after-free-in-ttm_bo_clean_mm.patch