drm/amdgpu: implement vcn start RB command

Signed-off-by: Leo Liu <leo.liu@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

1 files changed, 20 insertions, 1 deletions

diff --git a/drivers/gpu/drm/amd/amdgpu/vcn_v1_0.c b/drivers/gpu/drm/amd/amdgpu/vcn_v1_0.c
index 643e4cecc3f6..2fd60de1377e 100644
--- a/drivers/gpu/drm/amd/amdgpu/vcn_v1_0.c
+++ b/drivers/gpu/drm/amd/amdgpu/vcn_v1_0.c
@@ -489,6 +489,23 @@ static void vcn_v1_0_dec_ring_set_wptr(struct amdgpu_ring *ring)
 }
 
 /**
+ * vcn_v1_0_dec_ring_insert_start - insert a start command
+ *
+ * @ring: amdgpu_ring pointer
+ *
+ * Write a start command to the ring.
+ */
+static void vcn_v1_0_dec_ring_insert_start(struct amdgpu_ring *ring)
+{
+        amdgpu_ring_write(ring,
+                PACKET0(SOC15_REG_OFFSET(UVD, 0, mmUVD_GPCOM_VCPU_DATA0), 0));
+        amdgpu_ring_write(ring, 0);
+        amdgpu_ring_write(ring,
+                PACKET0(SOC15_REG_OFFSET(UVD, 0, mmUVD_GPCOM_VCPU_CMD), 0));
+        amdgpu_ring_write(ring, VCN_CMD_PACKET_START << 1);
+}
+
+/**
  * vcn_v1_0_dec_ring_emit_fence - emit an fence & trap command
  *
  * @ring: amdgpu_ring pointer
@@ -683,7 +700,8 @@ static const struct amdgpu_ring_funcs vcn_v1_0_dec_ring_vm_funcs = {
         .emit_frame_size =
                 2 + /* vcn_v1_0_dec_ring_emit_hdp_invalidate */
                 34 * AMDGPU_MAX_VMHUBS + /* vcn_v1_0_dec_ring_emit_vm_flush */
-                14 + 14, /* vcn_v1_0_dec_ring_emit_fence x2 vm fence */
+                14 + 14 + /* vcn_v1_0_dec_ring_emit_fence x2 vm fence */
+                4,
         .emit_ib_size = 8, /* vcn_v1_0_dec_ring_emit_ib */
         .emit_ib = vcn_v1_0_dec_ring_emit_ib,
         .emit_fence = vcn_v1_0_dec_ring_emit_fence,
@@ -692,6 +710,7 @@ static const struct amdgpu_ring_funcs vcn_v1_0_dec_ring_vm_funcs = {
         .test_ring = amdgpu_vcn_dec_ring_test_ring,
         .test_ib = amdgpu_vcn_dec_ring_test_ib,
         .insert_nop = amdgpu_ring_insert_nop,
+        .insert_start = vcn_v1_0_dec_ring_insert_start,
         .pad_ib = amdgpu_ring_generic_pad_ib,
         .begin_use = amdgpu_vcn_ring_begin_use,
         .end_use = amdgpu_vcn_ring_end_use,