1 # Copyright (c) 2014 The Chromium OS Authors. All rights reserved. 2 # Use of this source code is governed by a BSD-style license that can be 3 # found in the LICENSE file. 4 5 6 import os.path 7 import time 8 9 from autotest_lib.client.common_lib import error 10 from autotest_lib.client.common_lib.cros import chrome 11 from autotest_lib.client.bin import test, utils 12 from autotest_lib.client.cros.graphics import graphics_utils 13 14 15 class power_PSROccupancyTest(test.test): 16 """ 17 Tests that PSR is entered on a static content. 18 19 The purpose of this test is to verify that display enters the PSR state when 20 the content being displayed is static. It also verifies that the display 21 stays in PSR state for as long as the display is static. It first enables 22 PSR if not enabled and makes the displayed content static. It then waits for 23 some time, after which it checks whether the display was in PSR state for 24 close to (<wait time> - <vblankoffdelay>). 25 """ 26 version = 1 27 28 29 def _is_psr_enabled(self): 30 enable_psr_file_path = '/sys/module/i915/parameters/enable_psr' 31 if not os.path.exists(enable_psr_file_path): 32 raise error.TestFail('sysfs entry for "enable_psr" is missing.') 33 return int(utils.read_file(enable_psr_file_path)) == 1 34 35 36 def _get_perf_count(self): 37 debugfs_file_path = '/sys/kernel/debug/dri/0/i915_edp_psr_status' 38 if not os.path.exists(debugfs_file_path): 39 raise error.TestFail('debugfs entry for PSR status is missing.') 40 psr_status = utils.read_file(debugfs_file_path).splitlines() 41 if len(psr_status) != 4: 42 raise error.TestFail( 43 'Incorrect number of lines in %s.' % debugfs_file_path) 44 perf_count_chunks = psr_status[3].split() 45 if len(perf_count_chunks) != 2: 46 raise error.TestFail('Unknown format in %s.' % debugfs_file_path) 47 return int(perf_count_chunks[1]) 48 49 50 def _get_vblank_timeout(self): 51 return int(utils.read_file('/sys/module/drm/parameters/vblankoffdelay')) 52 53 54 def run_once(self): 55 if utils.get_board() not in ['samus', 'gandof']: 56 raise error.TestNAError( 57 'Trying to run PSR tests on unsupported board.') 58 psr_enabled = self._is_psr_enabled() 59 if (not psr_enabled and 60 graphics_utils.call_xrandr('--output eDP1 --set psr on')): 61 error.TestFail('Unable to enable PSR via xrandr.') 62 # Start chrome in full screen mode so that there is no blinking cursor 63 # or ticking clock on the screen. 64 with chrome.Chrome(logged_in=False, extra_browser_args=['--kiosk']): 65 # Sample the PSR performance count from debugfs and wait for 20s. 66 # At the end of 20s, re-sample the PSR performance count. The time 67 # spent in PSR should be close to (20s - <vblankoffdelay>). 68 sleep_time_milliseconds = 20 * 1000 69 min_occupancy = 0.9 * (sleep_time_milliseconds - 70 self._get_vblank_timeout()) 71 perf_count_old = self._get_perf_count() 72 time.sleep(sleep_time_milliseconds / 1000) 73 perf_count_new = self._get_perf_count() 74 occupancy_time = perf_count_new - perf_count_old 75 if occupancy_time < min_occupancy: 76 raise error.TestFail( 77 'PSR occupancy time %dms less than expected.' % 78 occupancy_time) 79 # Disable PSR if it was not enabled to begin with. 80 if (not psr_enabled and 81 graphics_utils.call_xrandr('--output eDP1 --set psr off')): 82 raise error.TestWarn('Unable to disable PSR via xrandr.') 83
