• Zhang Rui's avatar
    i915: ignore lid open event when resuming · b8efb17b
    Zhang Rui authored
    i915 driver needs to do modeset when
    1. system resumes from sleep
    2. lid is opened
    
    In PM_SUSPEND_MEM state, all the GPEs are cleared when system resumes,
    thus it is the i915_resume code does the modeset rather than intel_lid_notify().
    
    But in PM_SUSPEND_FREEZE state, this will be broken because
    system is still responsive to the lid events.
    1. When we close the lid in Freeze state, intel_lid_notify() sets modeset_on_lid.
    2. When we reopen the lid, intel_lid_notify() will do a modeset,
       before the system is resumed.
    here is the error log,
    
    [92146.548074] WARNING: at drivers/gpu/drm/i915/intel_display.c:1028 intel_wait_for_pipe_off+0x184/0x190 [i915]()
    [92146.548076] Hardware name: VGN-Z540N
    [92146.548078] pipe_off wait timed out
    [92146.548167] Modules linked in: hid_generic usbhid hid snd_hda_codec_realtek snd_hda_intel snd_hda_codec parport_pc snd_hwdep ppdev snd_pcm_oss i915 snd_mixer_oss snd_pcm arc4 iwldvm snd_seq_dummy mac80211 snd_seq_oss snd_seq_midi fbcon tileblit font bitblit softcursor drm_kms_helper snd_rawmidi snd_seq_midi_event coretemp drm snd_seq kvm btusb bluetooth snd_timer iwlwifi pcmcia tpm_infineon i2c_algo_bit joydev snd_seq_device intel_agp cfg80211 snd intel_gtt yenta_socket pcmcia_rsrc sony_laptop agpgart microcode psmouse tpm_tis serio_raw mxm_wmi soundcore snd_page_alloc tpm acpi_cpufreq lpc_ich pcmcia_core tpm_bios mperf processor lp parport firewire_ohci firewire_core crc_itu_t sdhci_pci sdhci thermal e1000e
    [92146.548173] Pid: 4304, comm: kworker/0:0 Tainted: G        W    3.8.0-rc3-s0i3-v3-test+ #9
    [92146.548175] Call Trace:
    [92146.548189]  [<c10378e2>] warn_slowpath_common+0x72/0xa0
    [92146.548227]  [<f86398b4>] ? intel_wait_for_pipe_off+0x184/0x190 [i915]
    [92146.548263]  [<f86398b4>] ? intel_wait_for_pipe_off+0x184/0x190 [i915]
    [92146.548270]  [<c10379b3>] warn_slowpath_fmt+0x33/0x40
    [92146.548307]  [<f86398b4>] intel_wait_for_pipe_off+0x184/0x190 [i915]
    [92146.548344]  [<f86399c2>] intel_disable_pipe+0x102/0x190 [i915]
    [92146.548380]  [<f8639ea4>] ? intel_disable_plane+0x64/0x80 [i915]
    [92146.548417]  [<f8639f7c>] i9xx_crtc_disable+0xbc/0x150 [i915]
    [92146.548456]  [<f863ebee>] intel_crtc_update_dpms+0x5e/0x90 [i915]
    [92146.548493]  [<f86437cf>] intel_modeset_setup_hw_state+0x42f/0x8f0 [i915]
    [92146.548535]  [<f8645b0b>] intel_lid_notify+0x9b/0xc0 [i915]
    [92146.548543]  [<c15610d3>] notifier_call_chain+0x43/0x60
    [92146.548550]  [<c105d1e1>] __blocking_notifier_call_chain+0x41/0x80
    [92146.548556]  [<c105d23f>] blocking_notifier_call_chain+0x1f/0x30
    [92146.548563]  [<c131a684>] acpi_lid_send_state+0x78/0xa4
    [92146.548569]  [<c131aa9e>] acpi_button_notify+0x3b/0xf1
    [92146.548577]  [<c12df56a>] ? acpi_os_execute+0x17/0x19
    [92146.548582]  [<c12e591a>] ? acpi_ec_sync_query+0xa5/0xbc
    [92146.548589]  [<c12e2b82>] acpi_device_notify+0x16/0x18
    [92146.548595]  [<c12f4904>] acpi_ev_notify_dispatch+0x38/0x4f
    [92146.548600]  [<c12df0e8>] acpi_os_execute_deferred+0x20/0x2b
    [92146.548607]  [<c1051208>] process_one_work+0x128/0x3f0
    [92146.548613]  [<c1564f73>] ? common_interrupt+0x33/0x38
    [92146.548618]  [<c104f8c0>] ? wake_up_worker+0x30/0x30
    [92146.548624]  [<c12df0c8>] ? acpi_os_wait_events_complete+0x1e/0x1e
    [92146.548629]  [<c10524f9>] worker_thread+0x119/0x3b0
    [92146.548634]  [<c10523e0>] ? manage_workers+0x240/0x240
    [92146.548640]  [<c1056e84>] kthread+0x94/0xa0
    [92146.548647]  [<c1060000>] ? ftrace_raw_output_sched_stat_runtime+0x70/0xf0
    [92146.548652]  [<c15649b7>] ret_from_kernel_thread+0x1b/0x28
    [92146.548658]  [<c1056df0>] ? kthread_create_on_node+0xc0/0xc0
    
    three different modeset flags are introduced in this patch
    MODESET_ON_LID_OPEN: do modeset on next lid open event
    MODESET_DONE:  modeset already done
    MODESET_SUSPENDED:  suspended, only do modeset when system is resumed
    
    In this way,
    1. when lid is closed, MODESET_ON_LID_OPEN is set so that
       we'll do modeset on next lid open event.
    2. when lid is opened, MODESET_DONE is set
       so that duplicate lid open events will be ignored.
    3. when system suspends, MODESET_SUSPENDED is set.
       In this case, we will not do modeset on any lid events.
    
    Plus, locking mechanism is also introduced to avoid racing.
    Signed-off-by: default avatarZhang Rui <rui.zhang@intel.com>
    Signed-off-by: default avatarDaniel Vetter <daniel.vetter@ffwll.ch>
    b8efb17b
i915_dma.c 50.9 KB