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drm/i915/gvt: set the correct default value of CTX STATUS PTR 

Fix wrong initial csb read pointer value. This fixes the random
engine timeout issue in guest when guest boots up.

Fixes: 8453d674ae ("drm/i915/gvt: vGPU execlist virtualization")
Cc: stable@vger.kernel.org # v4.10+
Signed-off-by: Min He <min.he@intel.com>
Signed-off-by: Zhenyu Wang <zhenyuw@linux.intel.com>
This commit is contained in:
Min He 2017-04-06 11:01:45 +08:00 committed by Zhenyu Wang
parent aa4ce4493c
commit a34f836394
1 changed files with 2 additions and 1 deletions
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3
drivers/gpu/drm/i915/gvt/execlist.c
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@ -775,7 +775,8 @@ static void init_vgpu_execlist(struct intel_vgpu *vgpu, int ring_id)
_EL_OFFSET_STATUS_PTR);
ctx_status_ptr.dw = vgpu_vreg(vgpu, ctx_status_ptr_reg);
ctx_status_ptr.read_ptr = ctx_status_ptr.write_ptr = 0x7;
ctx_status_ptr.read_ptr = 0;
ctx_status_ptr.write_ptr = 0x7;
vgpu_vreg(vgpu, ctx_status_ptr_reg) = ctx_status_ptr.dw;
}