# Copyright 2016 The Chromium OS Authors. All rights reserved. # Use of this source code is governed by a BSD-style license that can be # found in the LICENSE file. import logging import math import time from autotest_lib.client.common_lib import error from autotest_lib.server.cros.faft.firmware_test import FirmwareTest from autotest_lib.server.cros.servo import pd_console class firmware_PDVbusRequest(FirmwareTest): """ Servo based USB PD VBUS level test. This test is written to use both the DUT and Plankton test board. It requires that the DUT support dualrole (SRC or SNK) operation. VBUS change requests occur in two methods. First, with the DUT in SNK mode, it uses the pd console command 'pd 0/1 dev V' command where V is the desired voltage 5/12/20. The 2nd test initiates the VBUS change by using special Plankton feature to send new SRC CAP message. This causes the DUT to request a new VBUS voltage mathcing what's in the SRC CAP message. Pass critera is all voltage transitions are successful. """ version = 1 PD_SETTLE_DELAY = 4 USBC_SINK_VOLTAGE = 5 USBC_MAX_VOLTAGE = 20 VBUS_TOLERANCE = 0.12 VOLTAGE_SEQUENCE = [5, 12, 20, 12, 5, 20, 5, 5, 12, 12, 20] def _compare_vbus(self, expected_vbus_voltage): """Check VBUS using plankton @param expected_vbus_voltage: nominal VBUS level (in volts) @returns: a tuple containing pass/fail indication and logging string """ # Get Vbus voltage and current vbus_voltage = self.plankton.vbus_voltage vbus_current = self.plankton.vbus_current # Compute voltage tolerance range tolerance = self.VBUS_TOLERANCE * expected_vbus_voltage voltage_difference = math.fabs(expected_vbus_voltage - vbus_voltage) result_str = 'Target = %02dV:\tAct = %.2f\tDelta = %.2f' % \ (expected_vbus_voltage, vbus_voltage, voltage_difference) # Verify that measured Vbus voltage is within expected range voltage_difference = math.fabs(expected_vbus_voltage - vbus_voltage) if voltage_difference > tolerance: result = 'FAIL' else: result = 'PASS' return result, result_str def initialize(self, host, cmdline_args): super(firmware_PDVbusRequest, self).initialize(host, cmdline_args) # Only run in normal mode self.switcher.setup_mode('normal') self.usbpd.send_command('chan 0') def cleanup(self): self.usbpd.send_command('chan 0xffffffff') super(firmware_PDVbusRequest, self).cleanup() def run_once(self): """Exectue VBUS request test. """ # create objects for pd utilities pd_dut_utils = pd_console.PDConsoleUtils(self.usbpd) pd_plankton_utils = pd_console.PDConsoleUtils(self.plankton) # Make sure PD support exists in the UART console if pd_dut_utils.verify_pd_console() == False: raise error.TestFail("pd command not present on console!") # Type C connection (PD contract) should exist at this point dut_state = pd_dut_utils.query_pd_connection() logging.info('DUT PD connection state: %r', dut_state) if dut_state['connect'] == False: raise error.TestFail("pd connection not found") if dut_state['role'] != pd_dut_utils.SNK_CONNECT: # DUT needs to be in SINK Mode, attempt to force change pd_dut_utils.set_pd_dualrole('snk') time.sleep(self.PD_SETTLE_DELAY) if pd_dut_utils.get_pd_state(dut_state['port']) != pd_dut_utils.SNK_CONNECT: raise error.TestFail("DUT not able to connect in SINK mode") # Plankton must be set to 20V SRC mode in order for the DUT # to be able to request all 3 possible voltage levels (5, 12, 20). # The DUT must be in SNK mode for the pd dev # command to have an effect. self.plankton.charge(self.USBC_MAX_VOLTAGE) time.sleep(self.PD_SETTLE_DELAY) logging.info('Start of DUT initiated tests') dut_failures = [] for v in self.VOLTAGE_SEQUENCE: # Build 'pd dev command cmd = 'pd %d dev %d' % (dut_state['port'], v) pd_dut_utils.send_pd_command(cmd) time.sleep(self.PD_SETTLE_DELAY) result, result_str = self._compare_vbus(v) logging.info('%s, %s', result_str, result) if result == 'FAIL': dut_failures.append(result_str) # Make sure Plankton is set back to 20VSRC so DUT will accept all options cmd = 'pd %d dev %d' % (dut_state['port'], self.USBC_MAX_VOLTAGE) time.sleep(self.PD_SETTLE_DELAY) # The next group of tests need DUT to connect in SNK and SRC modes pd_dut_utils.set_pd_dualrole('on') plankton_failures = [] logging.info('Start Plankton initiated tests') for voltage in self.plankton.get_charging_voltages(): logging.info('********* %r *********', voltage) # Set charging voltage self.plankton.charge(voltage) # Wait for new PD contract to be established time.sleep(self.PD_SETTLE_DELAY) # Get current Plankton PD state plankton_state = pd_plankton_utils.get_pd_state(0) expected_vbus_voltage = self.plankton.charging_voltage # If Plankton is sink, then Vbus_exp = 5v if plankton_state == pd_plankton_utils.SNK_CONNECT: expected_vbus_voltage = self.USBC_SINK_VOLTAGE result, result_str = self._compare_vbus(expected_vbus_voltage) logging.info('%s, %s', result_str, result) if result == 'FAIL': plankton_failures.append(result_str) if dut_failures: logging.error('DUT voltage request failures') for fail in dut_failures: logging.error('%s', fail) if plankton_failures: logging.error('Plankton voltage source cap failures') for fail in plankton_failures: logging.error('%s', fail) if dut_failures or plankton_failures: if dut_failures and plankton_failures: test = 'DUT and Plankton' number = len(dut_failures) + len(plankton_failures) elif dut_failures: test = 'DUT' number = len(dut_failures) else: test = 'Plankton' number = len(plankton_failures) raise error.TestFail('%s failed %d times' % (test, number))