drm/amdgpu: add fence suspend/resume functions

Added to:
- handle draining the ring on suspend
- properly enable/disable interrupts on suspend and resume

Fix breakages from:
commit 467ee3be53d240d08beed2e82a941e820c1ac323
Author: Chunming Zhou <david1.zhou@amd.com>
Date:   Mon Jun 1 14:14:32 2015 +0800

    drm/amdgpu: always enable EOP interrupt v2

Tested-by: Audrey Grodzovsky <audrey.grodzovsky@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

1 files changed, 4 insertions, 17 deletions

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
index 99f158e1baff..a816580fb474 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
@@ -1627,8 +1627,7 @@ int amdgpu_suspend_kms(struct drm_device *dev, bool suspend, bool fbcon)
         struct amdgpu_device *adev;
         struct drm_crtc *crtc;
         struct drm_connector *connector;
-        int i, r;
-        bool force_completion = false;
+        int r;
 
         if (dev == NULL || dev->dev_private == NULL) {
                 return -ENODEV;
@@ -1667,21 +1666,7 @@ int amdgpu_suspend_kms(struct drm_device *dev, bool suspend, bool fbcon)
         /* evict vram memory */
         amdgpu_bo_evict_vram(adev);
 
-        /* wait for gpu to finish processing current batch */
-        for (i = 0; i < AMDGPU_MAX_RINGS; i++) {
-                struct amdgpu_ring *ring = adev->rings[i];
-                if (!ring)
-                        continue;
-
-                r = amdgpu_fence_wait_empty(ring);
-                if (r) {
-                        /* delay GPU reset to resume */
-                        force_completion = true;
-                }
-        }
-        if (force_completion) {
-                amdgpu_fence_driver_force_completion(adev);
-        }
+        amdgpu_fence_driver_suspend(adev);
 
         r = amdgpu_suspend(adev);
 
@@ -1739,6 +1724,8 @@ int amdgpu_resume_kms(struct drm_device *dev, bool resume, bool fbcon)
 
         r = amdgpu_resume(adev);
 
+        amdgpu_fence_driver_resume(adev);
+
         r = amdgpu_ib_ring_tests(adev);
         if (r)
                 DRM_ERROR("ib ring test failed (%d).\n", r);