Commit ffe2a503 authored by Changbin Du's avatar Changbin Du Committed by Zhenyu Wang

drm/i915/gvt: Reduce rcs mocs switch latency

Use I915_WRITE_FW instead of I915_WRITE to reduce overhead.
The overall mmio switch latency lowers from ~600us to ~180us.
Signed-off-by: default avatarChangbin Du <changbin.du@intel.com>
Signed-off-by: default avatarZhenyu Wang <zhenyuw@linux.intel.com>
parent 0bde438b
......@@ -209,7 +209,7 @@ static void load_mocs(struct intel_vgpu *vgpu, int ring_id)
offset.reg = regs[ring_id];
for (i = 0; i < 64; i++) {
gen9_render_mocs[ring_id][i] = I915_READ_FW(offset);
I915_WRITE(offset, vgpu_vreg(vgpu, offset));
I915_WRITE_FW(offset, vgpu_vreg(vgpu, offset));
offset.reg += 4;
}
......
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