[Bug 93782] [i9xx TV] vblank wait timeout on crtc

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=93782

--- Comment #5 from andram <andreas.amann at gmx.de> ---
Get a similar warning. I have bisected my problem to the following kernel
patch:

commit edde361711ef8f396e401b25d970e329f68bec0b
Author: Maarten Lankhorst <maarten.lankhorst at linux.intel.com>
Date:   Wed Feb 17 09:18:35 2016 +0100

    drm/i915: Use atomic state to obtain load detection crtc, v3.

    Instead of restoring dpms and a flag for whether a temp fb is allocated
duplicate
    an atomic state before the new state is committed, and commit it the old
state
    in intel_release_load_detect_pipe.

    Changes since v1:
    - Use a real atomic state. (Ville)
    Changes since v2:
    - Do not preserve shared_dpll any more, no need to do so. (Ville)

    Signed-off-by: Maarten Lankhorst <maarten.lankhorst at linux.intel.com>
    Reviewed-by: Ville Syrjälä <ville.syrjala at linux.intel.com>
    Link:
http://patchwork.freedesktop.org/patch/msgid/1455697119-31416-2-git-send-email-maarten.lankhorst@linux.intel.com

This leads to the following dmesg warnings for me:

[   10.613368] ------------[ cut here ]------------
[   10.613396] WARNING: CPU: 0 PID: 89 at drivers/gpu/drm/drm_irq.c:1268
drm_wait_one_vblank+0x170/0x180 [drm]()
[   10.613406] vblank wait timed out on crtc 0
[   10.613412] Modules linked in: coretemp evdev input_leds psmouse serio_raw
pcspkr snd_hda_codec_hdmi snd_hda_codec_analog snd_hda_codec_generic lpc_ich
mfd_core ssb mmc_core fan thermal wmi battery i915 snd_hda_intel i2c_algo_bit
drm_kms_helper snd_hda_codec syscopyarea sysfillrect sysimgblt fb_sys_fops
snd_hwdep hp_accel snd_hda_core lis3lv02d e1000e snd_pcm input_polldev
led_class video snd_timer ptp drm intel_agp ac pps_core intel_gtt snd
acpi_cpufreq soundcore agpgart button processor ip_tables x_tables ext4 crc16
mbcache jbd2 jitterentropy_rng sha256_generic hmac drbg ansi_cprng xts gf128mul
algif_skcipher af_alg dm_crypt dm_mod sr_mod cdrom sd_mod ata_generic pata_acpi
atkbd libps2 ata_piix ahci libahci libata scsi_mod ehci_pci uhci_hcd ehci_hcd
usbcore usb_common i8042 serio
[   10.613531] CPU: 0 PID: 89 Comm: kworker/u4:4 Not tainted
4.5.0-rc3-AA-00365-gedde361 #32
[   10.613540] Hardware name: Hewlett-Packard HP 550/3618, BIOS 68MVU Ver. F.02
08/20/2008
[   10.613553] Workqueue: events_unbound async_run_entry_fn
[   10.613560]  00000286 00000286 f478dba8 c12681cf f478dbe8 f8382c65 f478dbd8
c105502d
[   10.613574]  f8385128 f478dc04 00000059 f8382c65 000004f4 f835a620 f835a620
f441b000
[   10.613587]  00000000 00000000 f478dbf0 c10550a3 00000009 f478dbe8 f8385128
f478dc04
[   10.613600] Call Trace:
[   10.613609]  [<c12681cf>] dump_stack+0x58/0x79
[   10.613616]  [<c105502d>] warn_slowpath_common+0x8d/0xd0
[   10.613628]  [<f835a620>] ? drm_wait_one_vblank+0x170/0x180 [drm]
[   10.613638]  [<f835a620>] ? drm_wait_one_vblank+0x170/0x180 [drm]
[   10.613645]  [<c10550a3>] warn_slowpath_fmt+0x33/0x40
[   10.613656]  [<f835a620>] drm_wait_one_vblank+0x170/0x180 [drm]
[   10.613665]  [<c1091cc0>] ? wake_atomic_t_function+0x70/0x70
[   10.613726]  [<f8657452>] intel_get_load_detect_pipe+0x762/0x7e0 [i915]
[   10.613774]  [<f869412a>] intel_tv_detect+0x1aa/0x6d0 [i915]
[   10.613786]  [<f836eb05>] ? drm_get_edid+0x25/0x3e0 [drm]
[   10.613798]  [<f8393b80>]
drm_helper_probe_single_connector_modes+0x2f0/0x520 [drm_kms_helper]
[   10.613810]  [<f83a0c88>] drm_fb_helper_initial_config+0x88/0x400
[drm_kms_helper]
[   10.613854]  [<f8669789>] intel_fbdev_initial_config+0x19/0x30 [i915]
[   10.613862]  [<c1072539>] async_run_entry_fn+0x49/0x170
[   10.613870]  [<c106ad6e>] process_one_work+0x1ae/0x410
[   10.613877]  [<c106b007>] worker_thread+0x37/0x490
[   10.613883]  [<c106afd0>] ? process_one_work+0x410/0x410
[   10.613890]  [<c10700cb>] kthread+0x9b/0xb0
[   10.613899]  [<c1494689>] ret_from_kernel_thread+0x21/0x38
[   10.613905]  [<c1070030>] ? kthread_worker_fn+0x130/0x130
[   10.613912] ---[ end trace 1da52df1c4cdc7e7 ]---

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