From: Leo Liu <leo.liu@amd.com>
Date: Thu, 11 May 2017 16:29:08 -0400
Subject: drm/amdgpu: add a ring func for vcn start command
Git-commit: ef44f8541e8e99f1040c0d1b147956e2c2f25d79
Patch-mainline: v4.13-rc1
References: FATE#326289 FATE#326079 FATE#326049 FATE#322398 FATE#326166

Needed for the proper command sequence for VCN.

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>
Acked-by: Petr Tesarik <ptesarik@suse.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_ib.c   |    3 +++
 drivers/gpu/drm/amd/amdgpu/amdgpu_ring.h |    1 +
 2 files changed, 4 insertions(+)

--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ib.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ib.c
@@ -169,6 +169,9 @@ int amdgpu_ib_schedule(struct amdgpu_rin
 		dma_fence_put(tmp);
 	}
 
+	if (ring->funcs->insert_start)
+		ring->funcs->insert_start(ring);
+
 	if (vm) {
 		r = amdgpu_vm_flush(ring, job);
 		if (r) {
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ring.h
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ring.h
@@ -132,6 +132,7 @@ struct amdgpu_ring_funcs {
 	int (*test_ib)(struct amdgpu_ring *ring, long timeout);
 	/* insert NOP packets */
 	void (*insert_nop)(struct amdgpu_ring *ring, uint32_t count);
+	void (*insert_start)(struct amdgpu_ring *ring);
 	void (*insert_end)(struct amdgpu_ring *ring);
 	/* pad the indirect buffer to the necessary number of dw */
 	void (*pad_ib)(struct amdgpu_ring *ring, struct amdgpu_ib *ib);