GMBUS_ACTIVE
ret = intel_de_wait_fw_ms(display, GMBUS2(display), GMBUS_ACTIVE, 0, 10, NULL);
vgpu_vreg_t(vgpu, PCH_GMBUS2) &= ~GMBUS_ACTIVE;
vgpu_vreg_t(vgpu, PCH_GMBUS2) &= ~GMBUS_ACTIVE;
vgpu_vreg_t(vgpu, PCH_GMBUS2) |= GMBUS_ACTIVE;