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Subject[PATCH AUTOSEL 4.19 117/167] drm/amdgpu/{uvd,vcn}: fetch ring's read_ptr after alloc
Date
From: Shirish S <shirish.s@amd.com>

[ Upstream commit 517b91f4cde3043d77b2178548473e8545ef07cb ]

[What]
readptr read always returns zero, since most likely
these blocks are either power or clock gated.

[How]
fetch rptr after amdgpu_ring_alloc() which informs
the power management code that the block is about to be
used and hence the gating is turned off.

Signed-off-by: Louis Li <Ching-shih.Li@amd.com>
Signed-off-by: Shirish S <shirish.s@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/gpu/drm/amd/amdgpu/amdgpu_vcn.c | 5 ++++-
drivers/gpu/drm/amd/amdgpu/uvd_v6_0.c | 5 ++++-
drivers/gpu/drm/amd/amdgpu/uvd_v7_0.c | 5 ++++-
3 files changed, 12 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vcn.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_vcn.c
index 400fc74bbae27..205e683fb9206 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vcn.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vcn.c
@@ -431,7 +431,7 @@ int amdgpu_vcn_dec_ring_test_ib(struct amdgpu_ring *ring, long timeout)
int amdgpu_vcn_enc_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;

@@ -441,6 +441,9 @@ int amdgpu_vcn_enc_ring_test_ring(struct amdgpu_ring *ring)
ring->idx, r);
return r;
}
+
+ rptr = amdgpu_ring_get_rptr(ring);
+
amdgpu_ring_write(ring, VCN_ENC_CMD_END);
amdgpu_ring_commit(ring);

diff --git a/drivers/gpu/drm/amd/amdgpu/uvd_v6_0.c b/drivers/gpu/drm/amd/amdgpu/uvd_v6_0.c
index d4070839ac809..80613a74df420 100644
--- a/drivers/gpu/drm/amd/amdgpu/uvd_v6_0.c
+++ b/drivers/gpu/drm/amd/amdgpu/uvd_v6_0.c
@@ -170,7 +170,7 @@ static void uvd_v6_0_enc_ring_set_wptr(struct amdgpu_ring *ring)
static int uvd_v6_0_enc_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;

@@ -180,6 +180,9 @@ static int uvd_v6_0_enc_ring_test_ring(struct amdgpu_ring *ring)
ring->idx, r);
return r;
}
+
+ rptr = amdgpu_ring_get_rptr(ring);
+
amdgpu_ring_write(ring, HEVC_ENC_CMD_END);
amdgpu_ring_commit(ring);

diff --git a/drivers/gpu/drm/amd/amdgpu/uvd_v7_0.c b/drivers/gpu/drm/amd/amdgpu/uvd_v7_0.c
index 057151b17b456..ce16b8329af04 100644
--- a/drivers/gpu/drm/amd/amdgpu/uvd_v7_0.c
+++ b/drivers/gpu/drm/amd/amdgpu/uvd_v7_0.c
@@ -175,7 +175,7 @@ static void uvd_v7_0_enc_ring_set_wptr(struct amdgpu_ring *ring)
static int uvd_v7_0_enc_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;

@@ -188,6 +188,9 @@ static int uvd_v7_0_enc_ring_test_ring(struct amdgpu_ring *ring)
ring->me, ring->idx, r);
return r;
}
+
+ rptr = amdgpu_ring_get_rptr(ring);
+
amdgpu_ring_write(ring, HEVC_ENC_CMD_END);
amdgpu_ring_commit(ring);

--
2.20.1
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