[PATCH] drm/amdgpu: stop/resume fb access when gpu reset V3

[Chunming Zhou]

V2: Add wait_for_mc_idle after stopping fb access
V3:
	1. Remove resume fb access since there is no need to
   	do that for gpu reset.
	2. Move stop fb access to amdgpu_gpu_reset function,
	since it's the same for all asics.

Change-Id: I86b5c2b8c78a17ef43ade2a97ef8a33853650be0
Signed-off-by: Chunming Zhou <David1.Zhou at amd.com>
Reviewed-by: Christian König <christian.koenig at amd.com> (V1)
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_device.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
index 449cc3e..c04ca4a 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
@@ -2015,6 +2015,13 @@ int amdgpu_gpu_reset(struct amdgpu_device *adev)
 	}
 
 retry:
+	/* Disable fb access */
+	if (adev->mode_info.num_crtc) {
+		struct amdgpu_mode_mc_save save;
+		amdgpu_display_stop_mc_access(adev, &save);
+		amdgpu_wait_for_idle(adev, AMD_IP_BLOCK_TYPE_GMC);
+	}
+
 	r = amdgpu_asic_reset(adev);
 	/* post card */
 	amdgpu_atom_asic_init(adev->mode_info.atom_context);
-- 
1.9.1