[PATCH 1/4] Revert "drm/amdgpu: disable GFX PG on CZ/BR/ST"

[Tom St Denis]

This partially reverts commit bd0ced160a2a7f1b23058bdca008f7770fd863c3.

But keeps the SMU SCLK slowdown and CP PG disabled since that
is what is causing the system hangs on Carrizo(AM4) systems.

PG is still disabled for ST systems as that hasn't been fully tested yet.

Signed-off-by: Tom St Denis <tom.stdenis at amd.com>
---
 drivers/gpu/drm/amd/amdgpu/vi.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/drivers/gpu/drm/amd/amdgpu/vi.c b/drivers/gpu/drm/amd/amdgpu/vi.c
index 9ba64989f092..e53bec87ec0f 100644
--- a/drivers/gpu/drm/amd/amdgpu/vi.c
+++ b/drivers/gpu/drm/amd/amdgpu/vi.c
@@ -1578,7 +1578,13 @@ 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 */
 		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_DMG |
+				AMD_PG_SUPPORT_GFX_PIPELINE;
 		adev->external_rev_id = adev->rev_id + 0x1;
 		break;
 	case CHIP_STONEY:
@@ -1597,6 +1603,7 @@ static int vi_common_early_init(void *handle)
 			AMD_CG_SUPPORT_HDP_LS |
 			AMD_CG_SUPPORT_SDMA_MGCG |
 			AMD_CG_SUPPORT_SDMA_LS;
+		adev->pg_flags = 0;
 		adev->external_rev_id = adev->rev_id + 0x1;
 		break;
 	default:
-- 
2.9.2