drm/amdgpu: use polling mem to set SDMA3 wptr for VF

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On Tonga VF, there're 2 sources updating wptr registers for
sdma3: 1) polling mem and 2) doorbell. When doorbell and polling
mem are both enabled on sdma3, there will be collision hit in
occasion between those two sources when ucode and h/w are doing
the updating on wptr register in parallel. Issue doesn't happen
on CP GFX/Compute since CP drops all doorbell writes when VF is
inactive. So enable polling mem and don't use doorbell for SDMA3.

Signed-off-by: Pixel Ding <Pixel.Ding@amd.com>
Reviewed-by: Monk Liu <monk.liu@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

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This commit is contained in:

Pixel Ding 2017-12-11 16:48:33 +08:00 • committed by Alex Deucher

parent b852f3d3fb

commit 2ffe31deb2

2 changed files with 20 additions and 8 deletions

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1

drivers/gpu/drm/amd/amdgpu/amdgpu_ring.h

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27

drivers/gpu/drm/amd/amdgpu/sdma_v3_0.c

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