[PATCH 06/11] drm/amdgpu/gfx6: Execute CLEAR_STATE when initializing compute rings

["Timur Kristóf" <timur.kristof@gmail.com>]

Emit a compute CLEAR_STATE packet on the compute rings after
the GFX ring already finished executing ME_INITIALIZE and
before the ring test, so that gfx_v6_0_cp_gfx_resume() can
wait until the CLEAR_STATE is complete.

For reference, see si_cp_start() in the old radeon driver.

Signed-off-by: Timur Kristóf <timur.kristof@gmail.com>
---
 drivers/gpu/drm/amd/amdgpu/gfx_v6_0.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/drivers/gpu/drm/amd/amdgpu/gfx_v6_0.c b/drivers/gpu/drm/amd/amdgpu/gfx_v6_0.c
index eeada89bb31a..5b570a4b5c01 100644
--- a/drivers/gpu/drm/amd/amdgpu/gfx_v6_0.c
+++ b/drivers/gpu/drm/amd/amdgpu/gfx_v6_0.c
@@ -2263,6 +2263,14 @@ static int gfx_v6_0_cp_gfx_resume(struct amdgpu_device *adev)
 	for (i = 0; i < adev->gfx.num_compute_rings; i++) {
 		ring = &adev->gfx.compute_ring[i];
 
+		r = amdgpu_ring_alloc(ring, 2);
+		if (r)
+			return r;
+
+		amdgpu_ring_write(ring, PACKET3_COMPUTE(PACKET3_CLEAR_STATE, 0));
+		amdgpu_ring_write(ring, 0);
+		amdgpu_ring_commit(ring);
+
 		r = amdgpu_ring_test_helper(ring);
 		if (r)
 			return r;
-- 
2.55.0