Should point out that under load the system isn't 100% stable just yet.
One thing I noted is that it will powerdown/up between frames it seems (by reading the PGFSM_CONFIG register) which it shouldn't be doing in a static configuration.
I wonder if it's powering down at bad times while under load?
Tom
________________________________
From: Tom St Denis <tstdenis82@xxxxxxxxx>
Sent: Thursday, July 7, 2016 20:47
To: amd-gfx at lists.freedesktop.org
Cc: StDenis, Tom
Subject: [PATCH 2/2] drm/amd/amdgpu: Add PG support for Carrizo UVD
Signed-off-by: Tom St Denis <tom.stdenis at amd.com>
---
drivers/gpu/drm/amd/amdgpu/vi.c | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/amd/amdgpu/vi.c b/drivers/gpu/drm/amd/amdgpu/vi.c
index 91d71e31d6db..d2421867014f 100644
--- a/drivers/gpu/drm/amd/amdgpu/vi.c
+++ b/drivers/gpu/drm/amd/amdgpu/vi.c
@@ -1580,13 +1580,17 @@ static int vi_common_early_init(void *handle)
AMD_CG_SUPPORT_SDMA_LS;
/* rev0 hardware doesn't support PG */
adev->pg_flags = 0;
- if (adev->rev_id != 0x00)
+ if (adev->rev_id != 0x00) {
adev->pg_flags |= AMD_PG_SUPPORT_GFX_PG |
AMD_PG_SUPPORT_GFX_SMG |
AMD_PG_SUPPORT_GFX_DMG |
AMD_PG_SUPPORT_CP |
AMD_PG_SUPPORT_RLC_SMU_HS |
AMD_PG_SUPPORT_GFX_PIPELINE;
+ /* powerplay UVD PG doesn't work yet */
+ if (!amdgpu_powerplay)
+ adev->pg_flags |= AMD_PG_SUPPORT_UVD;
+ }
adev->external_rev_id = adev->rev_id + 0x1;
break;
case CHIP_STONEY:
--
2.9.0
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