drm/amdgpu: Add empty HDP flush function to VCN v4.0.3

VCN 4.0.3 does not HDP flush with RRMT enabled. Instead, mmsch
will do the HDP flush.

This change is necessary for VCN v4.0.3, no need for backward compatibility

Signed-off-by: Lijo Lazar <lijo.lazar@amd.com>
Signed-off-by: Jane Jian <Jane.Jian@amd.com>
Reviewed-by: Hawking Zhang <Hawking.Zhang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

diff --git a/drivers/gpu/drm/amd/amdgpu/vcn_v4_0_3.c b/drivers/gpu/drm/amd/amdgpu/vcn_v4_0_3.c
index f53054e39ebb473462d610ac419e3cdf1b300394..101b120f6fbdd1d0aa637fc4332bb5544f761df2 100644 (file)
--- a/drivers/gpu/drm/amd/amdgpu/vcn_v4_0_3.c
+++ b/drivers/gpu/drm/amd/amdgpu/vcn_v4_0_3.c
@@ -1375,6 +1375,13 @@ static uint64_t vcn_v4_0_3_unified_ring_get_wptr(struct amdgpu_ring *ring)
                                    regUVD_RB_WPTR);
 }
 
+static void vcn_v4_0_3_ring_emit_hdp_flush(struct amdgpu_ring *ring)
+{
+       /* VCN engine access for HDP flush doesn't work when RRMT is enabled.
+        * This is a workaround to avoid any HDP flush through VCN ring.
+        */
+}
+
 /**
  * vcn_v4_0_3_unified_ring_set_wptr - set enc write pointer
  *
@@ -1415,6 +1422,7 @@ static const struct amdgpu_ring_funcs vcn_v4_0_3_unified_ring_vm_funcs = {
        .emit_ib = vcn_v2_0_enc_ring_emit_ib,
        .emit_fence = vcn_v2_0_enc_ring_emit_fence,
        .emit_vm_flush = vcn_v2_0_enc_ring_emit_vm_flush,
+       .emit_hdp_flush = vcn_v4_0_3_ring_emit_hdp_flush,
        .test_ring = amdgpu_vcn_enc_ring_test_ring,
        .test_ib = amdgpu_vcn_unified_ring_test_ib,
        .insert_nop = amdgpu_ring_insert_nop,