[PATCH] drm/amdgpu: fix vega10 graphic hang issue in S3 test

[ken.wang at amd.com]

From: Ken Wang <Ken.Wang at amd.com>

Change-Id: If01e32baa903c8c35991b1517c6d8bde98f5dae2
Signed-off-by: Ken Wang <Ken.Wang at amd.com>
---
 drivers/gpu/drm/amd/amdgpu/gfx_v9_0.c | 10 ++++++++--
 drivers/gpu/drm/amd/amdgpu/soc15d.h   |  1 +
 2 files changed, 9 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/gfx_v9_0.c b/drivers/gpu/drm/amd/amdgpu/gfx_v9_0.c
index 1f6a34b..e183b50 100644
--- a/drivers/gpu/drm/amd/amdgpu/gfx_v9_0.c
+++ b/drivers/gpu/drm/amd/amdgpu/gfx_v9_0.c
@@ -1615,7 +1615,7 @@ static int gfx_v9_0_cp_gfx_start(struct amdgpu_device *adev)
 	struct amdgpu_ring *ring = &adev->gfx.gfx_ring[0];
 	const struct cs_section_def *sect = NULL;
 	const struct cs_extent_def *ext = NULL;
-	int r, i;
+	int r, i, tmp;
 
 	/* init the CP */
 	WREG32_SOC15(GC, 0, mmCP_MAX_CONTEXT, adev->gfx.config.max_hw_contexts - 1);
@@ -1623,7 +1623,7 @@ static int gfx_v9_0_cp_gfx_start(struct amdgpu_device *adev)
 
 	gfx_v9_0_cp_gfx_enable(adev, true);
 
-	r = amdgpu_ring_alloc(ring, gfx_v9_0_get_csb_size(adev) + 4);
+	r = amdgpu_ring_alloc(ring, gfx_v9_0_get_csb_size(adev) + 4 + 3);
 	if (r) {
 		DRM_ERROR("amdgpu: cp failed to lock ring (%d).\n", r);
 		return r;
@@ -1661,6 +1661,12 @@ static int gfx_v9_0_cp_gfx_start(struct amdgpu_device *adev)
 	amdgpu_ring_write(ring, 0x8000);
 	amdgpu_ring_write(ring, 0x8000);
 
+	amdgpu_ring_write(ring, PACKET3(PACKET3_SET_UCONFIG_REG,1));
+	tmp = (PACKET3_SET_UCONFIG_REG_INDEX_TYPE |
+		(SOC15_REG_OFFSET(GC, 0, mmVGT_INDEX_TYPE) - PACKET3_SET_UCONFIG_REG_START));
+	amdgpu_ring_write(ring, tmp);
+	amdgpu_ring_write(ring, 0);
+
 	amdgpu_ring_commit(ring);
 
 	return 0;
diff --git a/drivers/gpu/drm/amd/amdgpu/soc15d.h b/drivers/gpu/drm/amd/amdgpu/soc15d.h
index ab94201..3b29827 100644
--- a/drivers/gpu/drm/amd/amdgpu/soc15d.h
+++ b/drivers/gpu/drm/amd/amdgpu/soc15d.h
@@ -250,6 +250,7 @@
 #define	PACKET3_SET_UCONFIG_REG				0x79
 #define		PACKET3_SET_UCONFIG_REG_START			0x0000c000
 #define		PACKET3_SET_UCONFIG_REG_END			0x0000c400
+#define		PACKET3_SET_UCONFIG_REG_INDEX_TYPE		(2 << 28)
 #define	PACKET3_SCRATCH_RAM_WRITE			0x7D
 #define	PACKET3_SCRATCH_RAM_READ			0x7E
 #define	PACKET3_LOAD_CONST_RAM				0x80
-- 
2.7.4