[PATCH] drm/amdgpu: limit VCN instance number to 1 for NAVY_FLOUNDER

[Chen, Guchun]

Hi Alex,

No, it does not help.

adev->vcn.harvest_config is 0 after retrieving harvest info from VBIOS. Looks that harvest info in VBIOs does not reflect the case that VCN1 is power gated.

I checked several navy flounders SKUs, the observation is the same, so this is likely a common case. Perhaps we need to check with VBIOS/SMU guys.

Regards,
Guchun

-----Original Message-----
From: Alex Deucher <alexdeucher at gmail.com> 
Sent: Thursday, October 21, 2021 9:06 PM
To: Chen, Guchun <Guchun.Chen at amd.com>
Cc: amd-gfx list <amd-gfx at lists.freedesktop.org>; Koenig, Christian <Christian.Koenig at amd.com>; Pan, Xinhui <Xinhui.Pan at amd.com>; Deucher, Alexander <Alexander.Deucher at amd.com>; Liu, Leo <Leo.Liu at amd.com>
Subject: Re: [PATCH] drm/amdgpu: limit VCN instance number to 1 for NAVY_FLOUNDER

On Thu, Oct 21, 2021 at 3:15 AM Guchun Chen <guchun.chen at amd.com> wrote:
>
> VCN instance 1 is power gated permanently by SMU.
>
> Bug: 
> https://nam11.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgitl
> ab.freedesktop.org%2Fdrm%2Famd%2F-%2Fissues%2F1743&data=04%7C01%7C
> guchun.chen%40amd.com%7Cda80a308a28049d543ad08d99493847d%7C3dd8961fe48
> 84e608e11a82d994e183d%7C0%7C0%7C637704183581593964%7CUnknown%7CTWFpbGZ
> sb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3
> D%7C1000&sdata=2vNLj9bXE2oV97rxBiUOiaFNpKopVSJefL%2BMcQE%2BSfo%3D&
> amp;reserved=0
>
> Fixes: f6b6d7d6bc2d("drm/amdgpu/vcn: remove manual instance setting")
> Signed-off-by: Guchun Chen <guchun.chen at amd.com>

Doesn't this patch effectively do the same thing?
https://nam11.safelinks.protection.outlook.com/?url=https%3A%2F%2Fpatchwork.freedesktop.org%2Fpatch%2F460329%2F&data=04%7C01%7Cguchun.chen%40amd.com%7Cda80a308a28049d543ad08d99493847d%7C3dd8961fe4884e608e11a82d994e183d%7C0%7C0%7C637704183581593964%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=jPu3Yh%2B6OHR4F1BS5MWL3VyZ3pui6c0dP97Zl7yBJKY%3D&reserved=0
Where else is num_vcn_inst used that it causes a problem?  Or is the VCN harvesting not set correctly on some navy flounders?

Alex

> ---
>  drivers/gpu/drm/amd/amdgpu/vcn_v3_0.c | 9 +++++++++
>  1 file changed, 9 insertions(+)
>
> diff --git a/drivers/gpu/drm/amd/amdgpu/vcn_v3_0.c 
> b/drivers/gpu/drm/amd/amdgpu/vcn_v3_0.c
> index dbfd92984655..4848922667f2 100644
> --- a/drivers/gpu/drm/amd/amdgpu/vcn_v3_0.c
> +++ b/drivers/gpu/drm/amd/amdgpu/vcn_v3_0.c
> @@ -103,6 +103,15 @@ static int vcn_v3_0_early_init(void *handle)
>                         adev->vcn.num_enc_rings = 0;
>                 else
>                         adev->vcn.num_enc_rings = 2;
> +
> +               /*
> +                * Fix ME.
> +                * VCN instance number is limited to 1 for below ASIC due to
> +                * VCN instnace 1 is permanently power gated.
> +                */
> +               if ((adev->ip_versions[UVD_HWIP][0] == IP_VERSION(3, 0, 0)) &&
> +                       (adev->ip_versions[GC_HWIP][0] == IP_VERSION(10, 3, 2)))
> +                       adev->vcn.num_vcn_inst = 1;
>         }
>
>         vcn_v3_0_set_dec_ring_funcs(adev);
> --
> 2.17.1
>