[PATCH v3] drm/amdgpu: reset asic after system-wide suspend aborted (v3)

[Prike Liang]

Do ASIC reset at the moment Sx suspend aborted behind of amdgpu suspend
to keep AMDGPU in a clean reset state and that can avoid re-initialize
device improperly error. Currently,we just always do asic reset in the
amdgpu resume until sort out the PM abort case.

v2: Remove incomplete PM abort flag and add GPU hive case check for
GPU reset.

v3: Some dGPU reset method not support at the early resume time and
temprorary skip the dGPU case.

Signed-off-by: Prike Liang <Prike.Liang at amd.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_device.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
index 7d4115d..f6e1a6a 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
@@ -3983,6 +3983,14 @@ int amdgpu_device_resume(struct drm_device *dev, bool fbcon)
 	if (adev->in_s0ix)
 		amdgpu_gfx_state_change_set(adev, sGpuChangeState_D0Entry);
 
+	/*TODO: In order to not let all-always asic reset affect resume latency
+	 * need sort out the case which really need asic reset in the resume process.
+	 * As to the known issue on the system suspend abort behind the AMDGPU suspend,
+	 * may can sort this case by checking struct suspend_stats which need exported
+	 * firstly.
+	 */
+	if (adev->flags & AMD_IS_APU)
+		amdgpu_asic_reset(adev);
 	/* post card */
 	if (amdgpu_device_need_post(adev)) {
 		r = amdgpu_device_asic_init(adev);
-- 
2.7.4