Hi Alex,
This patch has covered the check of VCN as well. So you want me to modify the comments to add VCN as well?
Regards,
Guchun
-----Original Message-----
From: Alex Deucher <alexdeucher@xxxxxxxxx>
Sent: Wednesday, February 23, 2022 1:00 AM
To: Chen, Guchun <Guchun.Chen@xxxxxxx>
Cc: amd-gfx list <amd-gfx@xxxxxxxxxxxxxxxxxxxxx>; Deucher, Alexander <Alexander.Deucher@xxxxxxx>; Zhang, Hawking <Hawking.Zhang@xxxxxxx>; Koenig, Christian <Christian.Koenig@xxxxxxx>; Pan, Xinhui <Xinhui.Pan@xxxxxxx>
Subject: Re: [PATCH] drm/amdgpu: limit harvest bit read on several ASICs
On Tue, Feb 22, 2022 at 10:07 AM Guchun Chen <guchun.chen@xxxxxxx> wrote:
>
> Due to faulty VBIOS out there, harvest bit setting is not consistently
> correct especially for display IP. So far, it's hard to work out a
> solution on all the legacy Navi1x ASICs in a short time, so to avoid
> regression, limit harvest bit read on several ASICs. Will revisit
> later once VBIOS has corrected it in long term.
>
Looks like it may be incorrect for VCN as well. Double check that.
Alex
> Fixes: b3f4ea887d5f("drm/amdgpu: read harvest bit per IP data on
> legacy GPUs")
> Signed-off-by: Guchun Chen <guchun.chen@xxxxxxx>
> ---
> drivers/gpu/drm/amd/amdgpu/amdgpu_discovery.c | 18 +++++++++++++-----
> 1 file changed, 13 insertions(+), 5 deletions(-)
>
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_discovery.c
> b/drivers/gpu/drm/amd/amdgpu/amdgpu_discovery.c
> index 11255290f117..2e0ff1ace6fc 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_discovery.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_discovery.c
> @@ -1129,12 +1129,20 @@ void amdgpu_discovery_harvest_ip(struct amdgpu_device *adev)
> * so read harvest bit per IP data structure to set
> * harvest configuration.
> */
> - if (adev->ip_versions[GC_HWIP][0] < IP_VERSION(10, 2, 0))
> - amdgpu_discovery_read_harvest_bit_per_ip(adev,
> - &vcn_harvest_count);
> - else
> + if (adev->ip_versions[GC_HWIP][0] < IP_VERSION(10, 2, 0)) {
> + if ((adev->pdev->device == 0x731E &&
> + (adev->pdev->revision == 0xC6 ||
> + adev->pdev->revision == 0xC7)) ||
> + (adev->pdev->device == 0x7340 &&
> + adev->pdev->revision == 0xC9) ||
> + (adev->pdev->device == 0x7360 &&
> + adev->pdev->revision == 0xC7))
> + amdgpu_discovery_read_harvest_bit_per_ip(adev,
> + &vcn_harvest_count);
> + } else {
> amdgpu_disocvery_read_from_harvest_table(adev,
> - &vcn_harvest_count);
> + &vcn_harvest_count);
> + }
>
> amdgpu_discovery_harvest_config_quirk(adev);
>
> --
> 2.17.1
>
