[PATCH 5.1 63/70] drm/amdgpu: fix ring test failure issue during s3 in vce 3.0 (V2)

From: Greg Kroah-Hartman
Date: Sun Jun 09 2019 - 12:50:55 EST

From: Louis Li <Ching-shih.Li@xxxxxxx>

commit ce0e22f5d886d1b56c7ab4347c45b9ac5fcc058d upstream.

vce ring test fails consistently during resume in s3 cycle, due to
mismatch read & write pointers.
On debug/analysis its found that rptr to be compared is not being
correctly updated/read, which leads to this failure.
Below is the failure signature:
[drm:amdgpu_vce_ring_test_ring] *ERROR* amdgpu: ring 12 test failed
[drm:amdgpu_device_ip_resume_phase2] *ERROR* resume of IP block <vce_v3_0> failed -110
[drm:amdgpu_device_resume] *ERROR* amdgpu_device_ip_resume failed (-110).

fetch rptr appropriately, meaning move its read location further down
in the code flow.
With this patch applied the s3 failure is no more seen for >5k s3 cycles,
which otherwise is pretty consistent.

V2: remove reduntant fetch of rptr

Signed-off-by: Louis Li <Ching-shih.Li@xxxxxxx>
Reviewed-by: Christian KÃnig <christian.koenig@xxxxxxx>
Signed-off-by: Alex Deucher <alexander.deucher@xxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

drivers/gpu/drm/amd/amdgpu/amdgpu_vce.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)

--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vce.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vce.c
@@ -1072,7 +1072,7 @@ void amdgpu_vce_ring_emit_fence(struct a
int amdgpu_vce_ring_test_ring(struct amdgpu_ring *ring)
struct amdgpu_device *adev = ring->adev;
- uint32_t rptr = amdgpu_ring_get_rptr(ring);
+ uint32_t rptr;
unsigned i;
int r, timeout = adev->usec_timeout;

@@ -1084,6 +1084,8 @@ int amdgpu_vce_ring_test_ring(struct amd
if (r)
return r;

+ rptr = amdgpu_ring_get_rptr(ring);
amdgpu_ring_write(ring, VCE_CMD_END);