[PATCH 18/19] drm/amdgpu: Disable GFX PG on CZ

[StDenis, Tom]

Hi Felix,

I'm assuming your tree is up to date with amd-staging-4.11 or 4.12 but we did previously have issues with compute rings if PG was enabled (specifically CGCG + PG) on Carrizo.  Then David committed some KIQ upgrades and it started working properly.

Could that be related?  Because GFX PG "should work" on Carrizo is the official line last I heard from the GFX IP team.

Cheers,
Tom
________________________________________
From: amd-gfx <amd-gfx-bounces at lists.freedesktop.org> on behalf of Felix Kuehling <Felix.Kuehling at amd.com>
Sent: Friday, August 11, 2017 17:56
To: amd-gfx at lists.freedesktop.org; oded.gabbay at gmail.com
Cc: Kuehling, Felix
Subject: [PATCH 18/19] drm/amdgpu: Disable GFX PG on CZ

It's causing problems with user mode queues and the HIQ, and can
lead to hard hangs during boot after programming RLC_CP_SCHEDULERS.

Signed-off-by: Felix Kuehling <Felix.Kuehling at amd.com>
---
 drivers/gpu/drm/amd/amdgpu/vi.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/vi.c b/drivers/gpu/drm/amd/amdgpu/vi.c
index 18bb3cb..495c8a3 100644
--- a/drivers/gpu/drm/amd/amdgpu/vi.c
+++ b/drivers/gpu/drm/amd/amdgpu/vi.c
@@ -1029,8 +1029,7 @@ static int vi_common_early_init(void *handle)
                /* rev0 hardware requires workarounds to support PG */
                adev->pg_flags = 0;
                if (adev->rev_id != 0x00 || CZ_REV_BRISTOL(adev->pdev->revision)) {
-                       adev->pg_flags |= AMD_PG_SUPPORT_GFX_PG |
-                               AMD_PG_SUPPORT_GFX_SMG |
+                       adev->pg_flags |= AMD_PG_SUPPORT_GFX_SMG |
                                AMD_PG_SUPPORT_GFX_PIPELINE |
                                AMD_PG_SUPPORT_CP |
                                AMD_PG_SUPPORT_UVD |
--
2.7.4

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