[4.2.y-ckt stable] Patch "drm/amdgpu: fix s4 resume" has been added to the 4.2.y-ckt tree

[Kamal Mostafa]

This is a note to let you know that I have just added a patch titled

    drm/amdgpu: fix s4 resume

to the linux-4.2.y-queue branch of the 4.2.y-ckt extended stable tree 
which can be found at:

    http://kernel.ubuntu.com/git/ubuntu/linux.git/log/?h=linux-4.2.y-queue

This patch is scheduled to be released in version 4.2.8-ckt5.

If you, or anyone else, feels it should not be added to this tree, please 
reply to this email.

For more information about the 4.2.y-ckt tree, see
https://wiki.ubuntu.com/Kernel/Dev/ExtendedStable

Thanks.
-Kamal

---8<------------------------------------------------------------

>From 9b50bcbb5961b148df4b0ecbe107a13796c292f5 Mon Sep 17 00:00:00 2001
From: Flora Cui <Flora.Cui at amd.com>
Date: Thu, 4 Feb 2016 15:10:08 +0800
Subject: drm/amdgpu: fix s4 resume

commit ca19852884c8937eed89560f924f5a34cfcc22af upstream.

No need to re-init asic if it's already been initialized.
Skip IB tests since kernel processes are frozen in thaw.

Signed-off-by: Flora Cui <Flora.Cui at amd.com>
Reviewed-by: Alex Deucher <alexander.deucher at amd.com>
[ kamal: backport to 4.2-stable: context ]
Signed-off-by: Kamal Mostafa <kamal at canonical.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_device.c | 13 +++++++++----
 1 file changed, 9 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
index e12f490..dd9ffce 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
@@ -1735,13 +1735,18 @@ int amdgpu_resume_kms(struct drm_device *dev, bool resume, bool fbcon)
 	}

 	/* post card */
-	amdgpu_atom_asic_init(adev->mode_info.atom_context);
+	if (!amdgpu_card_posted(adev))
+		amdgpu_atom_asic_init(adev->mode_info.atom_context);

 	r = amdgpu_resume(adev);
-
-	r = amdgpu_ib_ring_tests(adev);
 	if (r)
-		DRM_ERROR("ib ring test failed (%d).\n", r);
+		DRM_ERROR("amdgpu_resume failed (%d).\n", r);
+
+	if (resume) {
+		r = amdgpu_ib_ring_tests(adev);
+		if (r)
+			DRM_ERROR("ib ring test failed (%d).\n", r);
+	}

 	r = amdgpu_late_init(adev);
 	if (r)
--
2.7.0