Commit 3f69d586 authored by Lijo Lazar's avatar Lijo Lazar Committed by Alex Deucher
Browse files

drm/amdgpu: Add a read to GFX v9.4.3 ring test 



Issue a read to confirm the register write before ringing doorbell. With
multiple XCCs there is chance for race condition.

Signed-off-by: default avatarLijo Lazar <lijo.lazar@amd.com>
Acked-by: default avatarHawking Zhang <Hawking.Zhang@amd.com>
Reviewed-by: default avatarAsad Kamal <asad.kamal@amd.com>
Signed-off-by: default avatarAlex Deucher <alexander.deucher@amd.com>
parent 5bd8e05f

drivers/gpu/drm/amd/amdgpu/gfx_v9_4_3.c

+1 −0
Original line number Diff line number Diff line
@@ -256,6 +256,7 @@ static int gfx_v9_4_3_ring_test_ring(struct amdgpu_ring *ring) 
	xcc_offset = SOC15_REG_OFFSET(GC, 0, regSCRATCH_REG0);

	scratch_reg0_offset = SOC15_REG_OFFSET(GC, GET_INST(GC, ring->xcc_id), regSCRATCH_REG0);

	WREG32(scratch_reg0_offset, 0xCAFEDEAD);

	tmp = RREG32(scratch_reg0_offset);



	r = amdgpu_ring_alloc(ring, 3);

	if (r)