[PATCH 01/31] drm/amdgpu/gmc9: disallow gfxoff around TLB flushes

[Alex Deucher <alexander.deucher@amd.com>]

We need to disallow gfxoff if we touch GC MMIO registers.
At the moment we use KIQ or MES for TLB flushes so
no intended functional change.

Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
---
 drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c b/drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c
index b46b87291c512..80f1cf1f21736 100644
--- a/drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c
+++ b/drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c
@@ -808,6 +808,10 @@ static void gmc_v9_0_flush_gpu_tlb(struct amdgpu_device *adev, uint32_t vmid,
 		return;
 	}
 
+	/* disabllow gfxoff when we invalidate */
+	if (vmhub < AMDGPU_MMHUB0(0))
+		amdgpu_gfx_off_ctrl(adev, false);
+
 	/* This path is needed before KIQ/MES/GFXOFF are set up */
 	spin_lock(&adev->gmc.invalidate_lock);
 
@@ -873,6 +877,9 @@ static void gmc_v9_0_flush_gpu_tlb(struct amdgpu_device *adev, uint32_t vmid,
 
 	spin_unlock(&adev->gmc.invalidate_lock);
 
+	if (vmhub < AMDGPU_MMHUB0(0))
+		amdgpu_gfx_off_ctrl(adev, true);
+
 	if (j < adev->usec_timeout)
 		return;
 
-- 
2.55.0