Re: [PATCH] drm/amdgpu: When the VCN(1.0) block is suspended, powergating is explicitly enabled

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On 12/10/2021 5:11 PM, chen gong wrote:
Play a video on the raven (or PCO, raven2) platform, and then do the S3
test. When resume, the following error will be reported:

amdgpu 0000:02:00.0: [drm:amdgpu_ring_test_helper [amdgpu]] *ERROR* ring
vcn_dec test failed (-110)
[drm:amdgpu_device_ip_resume_phase2 [amdgpu]] *ERROR* resume of IP block
<vcn_v1_0> failed -110
amdgpu 0000:02:00.0: amdgpu: amdgpu_device_ip_resume failed (-110).
PM: dpm_run_callback(): pci_pm_resume+0x0/0x90 returns -110

[why]
When playing the video: The power state flag of the vcn block is set to
POWER_STATE_ON.

When doing suspend: There is no change to the power state flag of the
vcn block, it is still POWER_STATE_ON.

When doing resume: Need to open the power gate of the vcn block and set
the power state flag of the VCN block to POWER_STATE_ON.
But at this time, the power state flag of the vcn block is already
POWER_STATE_ON. The power status flag check in the "8f2cdef drm/amd/pm:
avoid duplicate powergate/ungate setting" patch will return the
amdgpu_dpm_set_powergating_by_smu function directly.
As a result, the gate of the power was not opened, causing the
subsequent ring test to fail.

[how]
In the suspend function of the vcn block, explicitly change the power
state flag of the vcn block to POWER_STATE_OFF.

Signed-off-by: chen gong <curry.gong@xxxxxxx>
---
  drivers/gpu/drm/amd/amdgpu/vcn_v1_0.c | 7 +++++++
  1 file changed, 7 insertions(+)

diff --git a/drivers/gpu/drm/amd/amdgpu/vcn_v1_0.c b/drivers/gpu/drm/amd/amdgpu/vcn_v1_0.c
index d54d720..d73676b 100644
--- a/drivers/gpu/drm/amd/amdgpu/vcn_v1_0.c
+++ b/drivers/gpu/drm/amd/amdgpu/vcn_v1_0.c
@@ -246,6 +246,13 @@ static int vcn_v1_0_suspend(void *handle)
  {
  	int r;
  	struct amdgpu_device *adev = (struct amdgpu_device *)handle;
+	bool cancel_success;
+
+	cancel_success = cancel_delayed_work_sync(&adev->vcn.idle_work);
+	if (cancel_success) {
+		if (adev->pm.dpm_enabled)
+			amdgpu_dpm_enable_uvd(adev, false);
+	}

Probably this is a common issue. Can you try moving this to amdgpu_vcn_suspend?

if (adev->pm.dpm_enabled)
amdgpu_device_ip_set_powergating_state(adev, AMD_IP_BLOCK_TYPE_VCN,AMD_PG_STATE_GATE);

Call this after cancel_delayed_work_sync. Shouldn't have any effect if idle work already put it in PG state. Evan, what do you think?

Thanks,
Lijo

  	r = vcn_v1_0_hw_fini(adev);
  	if (r)




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