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

[Lazar, Lijo]

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 at amd.com>
> ---
>   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)
>