Re: [Intel-gfx] [PATCH V2 3/3] i915: ignore lid open event whenresuming

From: Zhang Rui
Date: Tue Feb 05 2013 - 07:34:52 EST

On Tue, 2013-02-05 at 11:07 +0100, Daniel Vetter wrote:
> On Tue, Feb 05, 2013 at 03:41:53PM +0800, Zhang Rui wrote:
> > oops, forgot to update the changelog and comments.
> > refreshed patch attached.
> >
> > From b584fcebb6d715a317f192c88606b875ee88ce78 Mon Sep 17 00:00:00 2001
> > From: Zhang Rui <rui.zhang@xxxxxxxxx>
> > Date: Thu, 24 Jan 2013 13:27:22 +0800
> > Subject: [PATCH V3 3/3] i915: ignore lid open event when resuming
> >
> > i915 driver needs to do modeset when
> > 1. system resumes from sleep
> > 2. lid is opened
>
> Patch applied, thanks. There's been a bit of a merge conflict and one tiny
> checkpatch error, both fixed while applying. I plan to push this patch to
> drm-next for 3.9.
> -Daniel
>

great, thanks!

-rui
> >
> > 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: Zhang Rui <rui.zhang@xxxxxxxxx>
> > ---
> > drivers/gpu/drm/i915/i915_dma.c | 1 +
> > drivers/gpu/drm/i915/i915_drv.c | 14 +++++++++-----
> > drivers/gpu/drm/i915/i915_drv.h | 11 +++++++++--
> > drivers/gpu/drm/i915/intel_lvds.c | 33 ++++++++++++++++++++-------------
> > 4 files changed, 39 insertions(+), 20 deletions(-)
> >
> > diff --git a/drivers/gpu/drm/i915/i915_dma.c b/drivers/gpu/drm/i915/i915_dma.c
> > index 99daa89..a5115d8 100644
> > --- a/drivers/gpu/drm/i915/i915_dma.c
> > +++ b/drivers/gpu/drm/i915/i915_dma.c
> > @@ -1585,6 +1585,7 @@ int i915_driver_load(struct drm_device *dev, unsigned long flags)
> > spin_lock_init(&dev_priv->dpio_lock);
> >
> > mutex_init(&dev_priv->rps.hw_lock);
> > + mutex_init(&dev_priv->modeset_restore_lock);
> >
> > if (IS_IVYBRIDGE(dev) || IS_HASWELL(dev))
> > dev_priv->num_pipe = 3;
> > diff --git a/drivers/gpu/drm/i915/i915_drv.c b/drivers/gpu/drm/i915/i915_drv.c
> > index 1172658..68c6048 100644
> > --- a/drivers/gpu/drm/i915/i915_drv.c
> > +++ b/drivers/gpu/drm/i915/i915_drv.c
> > @@ -468,6 +468,12 @@ static int i915_drm_freeze(struct drm_device *dev)
> > {
> > struct drm_i915_private *dev_priv = dev->dev_private;
> >
> > + /* ignore lid events during suspend */
> > + mutex_lock(&dev_priv->modeset_restore_lock);
> > + dev_priv->modeset_restore = MODESET_SUSPENDED;
> > + mutex_unlock(&dev_priv->modeset_restore_lock);
> > +
> > +
> > drm_kms_helper_poll_disable(dev);
> >
> > pci_save_state(dev->pdev);
> > @@ -492,9 +498,6 @@ static int i915_drm_freeze(struct drm_device *dev)
> >
> > intel_opregion_fini(dev);
> >
> > - /* Modeset on resume, not lid events */
> > - dev_priv->modeset_on_lid = 0;
> > -
> > console_lock();
> > intel_fbdev_set_suspend(dev, 1);
> > console_unlock();
> > @@ -569,8 +572,6 @@ static int __i915_drm_thaw(struct drm_device *dev)
> >
> > intel_opregion_init(dev);
> >
> > - dev_priv->modeset_on_lid = 0;
> > -
> > /*
> > * The console lock can be pretty contented on resume due
> > * to all the printk activity. Try to keep it out of the hot
> > @@ -583,6 +584,9 @@ static int __i915_drm_thaw(struct drm_device *dev)
> > schedule_work(&dev_priv->console_resume_work);
> > }
> >
> > + mutex_lock(&dev_priv->modeset_restore_lock);
> > + dev_priv->modeset_restore = MODESET_DONE;
> > + mutex_unlock(&dev_priv->modeset_restore_lock);
> > return error;
> > }
> >
> > diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
> > index 12ab3bd..0fddad01 100644
> > --- a/drivers/gpu/drm/i915/i915_drv.h
> > +++ b/drivers/gpu/drm/i915/i915_drv.h
> > @@ -620,6 +620,12 @@ struct intel_l3_parity {
> > struct work_struct error_work;
> > };
> >
> > +enum modeset_restore {
> > + MODESET_ON_LID_OPEN,
> > + MODESET_DONE,
> > + MODESET_SUSPENDED,
> > +};
> > +
> > typedef struct drm_i915_private {
> > struct drm_device *dev;
> >
> > @@ -750,9 +756,10 @@ typedef struct drm_i915_private {
> >
> > unsigned long quirks;
> >
> > - /* Register state */
> > - bool modeset_on_lid;
> > + enum modeset_restore modeset_restore;
> > + struct mutex modeset_restore_lock;
> >
> > + /* Register state */
> > struct {
> > /** Bridge to intel-gtt-ko */
> > struct intel_gtt *gtt;
> > diff --git a/drivers/gpu/drm/i915/intel_lvds.c b/drivers/gpu/drm/i915/intel_lvds.c
> > index 17aee74..ff89d58 100644
> > --- a/drivers/gpu/drm/i915/intel_lvds.c
> > +++ b/drivers/gpu/drm/i915/intel_lvds.c
> > @@ -492,13 +492,14 @@ static const struct dmi_system_id intel_no_modeset_on_lid[] = {
> > };
> >
> > /*
> > - * Lid events. Note the use of 'modeset_on_lid':
> > - * - we set it on lid close, and reset it on open
> > + * Lid events. Note the use of 'modeset':
> > + * - we set it to MODESET_ON_LID_OPEN on lid close,
> > + * and set it to MODESET_DONE on open
> > * - we use it as a "only once" bit (ie we ignore
> > - * duplicate events where it was already properly
> > - * set/reset)
> > - * - the suspend/resume paths will also set it to
> > - * zero, since they restore the mode ("lid open").
> > + * duplicate events where it was already properly set)
> > + * - the suspend/resume paths will set it to
> > + * MODESET_SUSPENDED and ignore the lid open event,
> > + * because they restore the mode ("lid open").
> > */
> > static int intel_lid_notify(struct notifier_block *nb, unsigned long val,
> > void *unused)
> > @@ -512,6 +513,9 @@ static int intel_lid_notify(struct notifier_block *nb, unsigned long val,
> > if (dev->switch_power_state != DRM_SWITCH_POWER_ON)
> > return NOTIFY_OK;
> >
> > + mutex_lock(&dev_priv->modeset_restore_lock);
> > + if (dev_priv->modeset_restore == MODESET_SUSPENDED)
> > + goto exit;
> > /*
> > * check and update the status of LVDS connector after receiving
> > * the LID nofication event.
> > @@ -520,21 +524,24 @@ static int intel_lid_notify(struct notifier_block *nb, unsigned long val,
> >
> > /* Don't force modeset on machines where it causes a GPU lockup */
> > if (dmi_check_system(intel_no_modeset_on_lid))
> > - return NOTIFY_OK;
> > + goto exit;
> > if (!acpi_lid_open()) {
> > - dev_priv->modeset_on_lid = 1;
> > - return NOTIFY_OK;
> > + /* do modeset on next lid open event */
> > + dev_priv->modeset_restore = MODESET_ON_LID_OPEN;
> > + goto exit;
> > }
> >
> > - if (!dev_priv->modeset_on_lid)
> > - return NOTIFY_OK;
> > -
> > - dev_priv->modeset_on_lid = 0;
> > + if (dev_priv->modeset_restore == MODESET_DONE)
> > + goto exit;
> >
> > mutex_lock(&dev->mode_config.mutex);
> > intel_modeset_setup_hw_state(dev, true);
> > mutex_unlock(&dev->mode_config.mutex);
> >
> > + dev_priv->modeset_restore = MODESET_DONE;
> > +
> > +exit:
> > + mutex_unlock(&dev_priv->modeset_restore_lock);
> > return NOTIFY_OK;
> > }
> >
> > --
> > 1.7.9.5
> >
> >
> >
>


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