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

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

Signed-off-by: Lijo Lazar <lijo.lazar@amd.com>
Acked-by: Hawking Zhang <Hawking.Zhang@amd.com>
Reviewed-by: Asad Kamal <asad.kamal@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Lijo Lazar
2023-10-20 12:23:37 +05:30
committed by Alex Deucher
parent 5bd8e05fe2
commit 3f69d5860f
1 changed files with 1 additions and 0 deletions
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drivers/gpu/drm/amd/amdgpu/gfx_v9_4_3.c
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@@ -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)