Patch "drm/amdgpu: add a delay after ATPX dGPU power off" has been added to the 4.4-stable tree

[<gregkh@linuxfoundation.org>]

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

    drm/amdgpu: add a delay after ATPX dGPU power off

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-add-a-delay-after-atpx-dgpu-power-off.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@vger.kernel.org> know about it.


>From f81eb1a349d47694fe1e688336ca1b40ea3e248a Mon Sep 17 00:00:00 2001
From: Alex Deucher <alexander.deucher@amd.com>
Date: Wed, 1 Jun 2016 12:54:33 -0400
Subject: drm/amdgpu: add a delay after ATPX dGPU power off
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

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

commit f81eb1a349d47694fe1e688336ca1b40ea3e248a upstream.

ATPX dGPU power control requires a 200ms delay between
power off and on.  This should fix dGPU failures on
resume from power off.

Reviewed-by: Hawking Zhang <Hawking.Zhang@amd.com>
Acked-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/amdgpu/amdgpu_atpx_handler.c |    5 +++++
 1 file changed, 5 insertions(+)

--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_atpx_handler.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_atpx_handler.c
@@ -10,6 +10,7 @@
 #include <linux/slab.h>
 #include <linux/acpi.h>
 #include <linux/pci.h>
+#include <linux/delay.h>
 
 #include "amdgpu_acpi.h"
 
@@ -256,6 +257,10 @@ static int amdgpu_atpx_set_discrete_stat
 		if (!info)
 			return -EIO;
 		kfree(info);
+
+		/* 200ms delay is required after off */
+		if (state == 0)
+			msleep(200);
 	}
 	return 0;
 }


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

queue-4.4/drm-amdgpu-support-backlight-control-for-uniphy3.patch
queue-4.4/drm-amdgpu-fix-firmware-info-version-checks.patch
queue-4.4/drm-radeon-add-a-delay-after-atpx-dgpu-power-off.patch
queue-4.4/drm-amdgpu-add-a-delay-after-atpx-dgpu-power-off.patch
queue-4.4/drm-amdgpu-poll-for-both-connect-disconnect-on-analog-connectors.patch
queue-4.4/drm-radeon-support-backlight-control-for-uniphy3.patch
queue-4.4/drm-radeon-poll-for-both-connect-disconnect-on-analog-connectors.patch
queue-4.4/drm-radeon-fix-firmware-info-version-checks.patch
queue-4.4/drm-amdgpu-gmc7-add-missing-mullins-case.patch
queue-4.4/drm-amdgpu-disable-rpm-helpers-while-reprobing-connectors-on-resume.patch