I don't have rev0 hardware. I can edit the comment but I can't test the switch to the logic.
Is there even rev0 hardware in retail?
Tom
________________________________
From: Alex Deucher <alexdeucher@xxxxxxxxx>
Sent: Tuesday, July 26, 2016 14:47
To: Tom St Denis
Cc: amd-gfx list; StDenis, Tom
Subject: Re: [PATCH 2/4] drm/amd/amdgpu: Add GFX and UVD PG for Carrizo
On Tue, Jul 26, 2016 at 11:38 AM, Tom St Denis <tstdenis82 at gmail.com> wrote:
> Enables GFX PG and UVD static PG on Carrizo class
> asics.
>
> Signed-off-by: Tom St Denis <tom.stdenis at amd.com>
> ---
> drivers/gpu/drm/amd/amdgpu/vi.c | 9 +++++++++
> 1 file changed, 9 insertions(+)
>
> diff --git a/drivers/gpu/drm/amd/amdgpu/vi.c b/drivers/gpu/drm/amd/amdgpu/vi.c
> index 9ba64989f092..289a4c4ac9e7 100644
> --- a/drivers/gpu/drm/amd/amdgpu/vi.c
> +++ b/drivers/gpu/drm/amd/amdgpu/vi.c
> @@ -1578,7 +1578,16 @@ static int vi_common_early_init(void *handle)
> AMD_CG_SUPPORT_HDP_LS |
> AMD_CG_SUPPORT_SDMA_MGCG |
> AMD_CG_SUPPORT_SDMA_LS;
> + /* rev0 hardware doesn't support PG */
It's probably worth correcting this comment. A0 theoretically
supports PG, but probably requires additional workarounds. Something
like "Don't enable PG on rev0 hw due to hw issues" or something like
that.
> adev->pg_flags = 0;
> + if (adev->rev_id != 0x00) {
> + adev->pg_flags |= AMD_PG_SUPPORT_GFX_PG |
> + AMD_PG_SUPPORT_GFX_SMG |
> + AMD_PG_SUPPORT_GFX_PIPELINE;
> + /* powerplay UVD PG doesn't work yet */
> + if (!amdgpu_powerplay)
> + adev->pg_flags |= AMD_PG_SUPPORT_UVD;
It's probably worth testing UVD PG on rev0 hw as well so see if we can
enable this on them as well. OTOH, there isn't likely much rev0 hw in
the wild, so it may not matter too much.
Alex
> + }
> adev->external_rev_id = adev->rev_id + 0x1;
> break;
> case CHIP_STONEY:
> --
> 2.9.2
>
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