[PATCH 08/12] drm/amdgpu: A workaround for JPEG_v4_0_3 ring test fail
Alex Deucher
alexander.deucher at amd.com
Tue May 9 22:11:24 UTC 2023
From: Sonny Jiang <sonny.jiang at amd.com>
The jpeg_v4_0_3 jpeg_pitch register uses UVD_JRBC_SCRATCH0. It needs to
move WREG() to after jpeg_start.
Switch to a posted register write when doing the ring test to make sure
the register write lands before we test the result.
Signed-off-by: Sonny Jiang <sonny.jiang at amd.com>
Reviewed-by: Leo Liu <leo.liu at amd.com>
Signed-off-by: Alex Deucher <alexander.deucher at amd.com>
---
drivers/gpu/drm/amd/amdgpu/amdgpu_jpeg.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_jpeg.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_jpeg.c
index 388466a5f730..9a1db2bd03e7 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_jpeg.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_jpeg.c
@@ -124,11 +124,14 @@ int amdgpu_jpeg_dec_ring_test_ring(struct amdgpu_ring *ring)
if (amdgpu_sriov_vf(adev))
return 0;
- WREG32(adev->jpeg.inst[ring->me].external.jpeg_pitch[ring->pipe], 0xCAFEDEAD);
r = amdgpu_ring_alloc(ring, 3);
if (r)
return r;
+ WREG32(adev->jpeg.inst[ring->me].external.jpeg_pitch[ring->pipe], 0xCAFEDEAD);
+ /* Add a read register to make sure the write register is executed. */
+ RREG32(adev->jpeg.inst[ring->me].external.jpeg_pitch[ring->pipe]);
+
amdgpu_ring_write(ring, PACKET0(adev->jpeg.internal.jpeg_pitch[ring->pipe], 0));
amdgpu_ring_write(ring, 0xDEADBEEF);
amdgpu_ring_commit(ring);
--
2.40.1
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