drm/amdgpu/{uvd,vcn}: fetch ring's read_ptr after alloc

[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

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vcn.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_vcn.c
index ecf6f96..e6b07ec 100644 (file)
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vcn.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vcn.c
@@ -594,7 +594,7 @@ error:
 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;
 
@@ -602,6 +602,8 @@ int amdgpu_vcn_enc_ring_test_ring(struct amdgpu_ring *ring)
        if (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 c9edddf..be70e6e 100644 (file)
--- a/drivers/gpu/drm/amd/amdgpu/uvd_v6_0.c
+++ b/drivers/gpu/drm/amd/amdgpu/uvd_v6_0.c
@@ -170,13 +170,16 @@ 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;
 
        r = amdgpu_ring_alloc(ring, 16);
        if (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 2191d3d..fc4f0bb 100644 (file)
--- 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;
 
@@ -185,6 +185,9 @@ static int uvd_v7_0_enc_ring_test_ring(struct amdgpu_ring *ring)
        r = amdgpu_ring_alloc(ring, 16);
        if (r)
                return r;
+
+       rptr = amdgpu_ring_get_rptr(ring);
+
        amdgpu_ring_write(ring, HEVC_ENC_CMD_END);
        amdgpu_ring_commit(ring);