[Bug 92580] New: [drm:drm_calc_timestamping_constants [drm]] *ERROR* crtc 21: Can't calculate constants, dotclock = 0!

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=92580

            Bug ID: 92580
           Summary: [drm:drm_calc_timestamping_constants [drm]] *ERROR*
                    crtc 21: Can't calculate constants, dotclock = 0!
           Product: DRI
           Version: XOrg git
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: ajb at elrepo.org
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Created attachment 119054
  --> https://bugs.freedesktop.org/attachment.cgi?id=119054&action=edit
Complete dmesg file

Starting with linux-4.3-rc1 and through to the current 4.3-rc6 sources from
Linus' tree, the error message --

[drm:drm_calc_timestamping_constants [drm]] *ERROR* crtc 21: Can't calculate
constants, dotclock = 0!

-- followed by --

------------[ cut here ]------------
WARNING: CPU: 1 PID: 6 at drivers/gpu/drm/drm_atomic.c:491
drm_atomic_check_only+0x399/0x540 [drm]()
Modules linked in: ahci(+) libahci libata firewire_ohci(+) firewire_core
crc_itu_t yenta_socket(+) tg3 ptp pps_core i915(+) i2c_algo_bit drm_kms_helper
syscopyarea sysfillrect sysimgblt fb_sys_fops drm video
CPU: 1 PID: 6 Comm: kworker/u4:0 Not tainted 4.3.0-0.rc1.el7.elrepo.x86_64 #1
Hardware name: Dell Inc. Latitude E5500                  /0DW633, BIOS A19
06/13/2013
Workqueue: events_unbound async_run_entry_fn
 0000000000000000 0000000011057432 ffff88011abdfa10 ffffffff8131e6b0
 0000000000000000 ffff88011abdfa48 ffffffff8107ae96 ffff880037303000
 0000000000000000 0000000000000000 0000000000000000 ffff880037bfb600
Call Trace:
 [<ffffffff8131e6b0>] dump_stack+0x44/0x64
 [<ffffffff8107ae96>] warn_slowpath_common+0x86/0xc0
 [<ffffffff8107afda>] warn_slowpath_null+0x1a/0x20
 [<ffffffffa002f529>] drm_atomic_check_only+0x399/0x540 [drm]
 [<ffffffffa002f7bd>] ? drm_atomic_set_fb_for_plane+0x2d/0x90 [drm]
 [<ffffffffa002f6e7>] drm_atomic_commit+0x17/0x60 [drm]
 [<ffffffffa014f3d5>] intel_get_load_detect_pipe+0x395/0x540 [i915]
 [<ffffffffa018671a>] intel_tv_detect+0x13a/0x570 [i915]
 [<ffffffff81530080>] ? i2c_transfer+0x60/0xb0
 [<ffffffffa016dc11>] ? intel_dp_detect+0x101/0x4f0 [i915]
 [<ffffffffa00a2d25>]
drm_helper_probe_single_connector_modes_merge_bits+0x2e5/0x4a0 [drm_kms_helper]
 [<ffffffffa00a2ef3>] drm_helper_probe_single_connector_modes+0x13/0x20
[drm_kms_helper]
 [<ffffffffa00ace6d>] drm_fb_helper_probe_connector_modes.isra.3+0x4d/0x70
[drm_kms_helper]
 [<ffffffffa00ae05a>] drm_fb_helper_initial_config+0x5a/0x3c0 [drm_kms_helper]
 [<ffffffff810156b2>] ? __switch_to+0x202/0x490
 [<ffffffffa015f44b>] intel_fbdev_initial_config+0x1b/0x20 [i915]
 [<ffffffff8109c0fa>] async_run_entry_fn+0x4a/0x140
 [<ffffffff8109302c>] process_one_work+0x14c/0x3c0
 [<ffffffff81093894>] worker_thread+0x114/0x470
 [<ffffffff81093780>] ? rescuer_thread+0x310/0x310
 [<ffffffff810993d8>] kthread+0xd8/0xf0
 [<ffffffff81099300>] ? kthread_park+0x60/0x60
 [<ffffffff816d02df>] ret_from_fork+0x3f/0x70
 [<ffffffff81099300>] ? kthread_park+0x60/0x60
---[ end trace a4f3b246a07cdefe ]---

-- and --

------------[ cut here ]------------
WARNING: CPU: 0 PID: 231 at drivers/gpu/drm/drm_atomic.c:491
drm_atomic_check_only+0x399/0x540 [drm]()
Modules linked in: iwldvm(+) iTCO_wdt mac80211 iTCO_vendor_support snd_timer
snd dell_wmi dell_rbtn dell_laptop gpio_ich sparse_keymap joydev sdhci_pci
sdhci input_leds ppdev dcdbas coretemp dell_smm_hwmon iwlwifi lpc_ich mmc_core
serio_raw kvm_intel pcspkr kvm wmi cfg80211 rfkill i2c_i801 mfd_core acpi_als
soundcore parport_pc 8250_fintek kfifo_buf industrialio parport shpchp
acpi_cpufreq xfs libcrc32c sr_mod cdrom sd_mod ahci libahci libata
firewire_ohci firewire_core crc_itu_t yenta_socket tg3 ptp pps_core i915
i2c_algo_bit drm_kms_helper syscopyarea sysfillrect sysimgblt fb_sys_fops drm
video
CPU: 0 PID: 231 Comm: kworker/0:3 Tainted: G        W      
4.3.0-0.rc1.el7.elrepo.x86_64 #1
Hardware name: Dell Inc. Latitude E5500                  /0DW633, BIOS A19
06/13/2013
Workqueue: events output_poll_execute [drm_kms_helper]
 0000000000000000 00000000fdb96593 ffff88003702ba10 ffffffff8131e6b0
 0000000000000000 ffff88003702ba48 ffffffff8107ae96 ffff880037303000
 0000000000000000 0000000000000000 0000000000000000 ffff8800d63f6200
Call Trace:
 [<ffffffff8131e6b0>] dump_stack+0x44/0x64
 [<ffffffff8107ae96>] warn_slowpath_common+0x86/0xc0
 [<ffffffff8107afda>] warn_slowpath_null+0x1a/0x20
 [<ffffffffa002f529>] drm_atomic_check_only+0x399/0x540 [drm]
 [<ffffffffa002f7bd>] ? drm_atomic_set_fb_for_plane+0x2d/0x90 [drm]
 [<ffffffffa002f6e7>] drm_atomic_commit+0x17/0x60 [drm]
 [<ffffffffa014f3d5>] intel_get_load_detect_pipe+0x395/0x540 [i915]
 [<ffffffffa018671a>] intel_tv_detect+0x13a/0x570 [i915]
 [<ffffffff81530080>] ? i2c_transfer+0x60/0xb0
 [<ffffffffa00a2d25>]
drm_helper_probe_single_connector_modes_merge_bits+0x2e5/0x4a0 [drm_kms_helper]
 [<ffffffffa00a2ef3>] drm_helper_probe_single_connector_modes+0x13/0x20
[drm_kms_helper]
 [<ffffffffa00ace6d>] drm_fb_helper_probe_connector_modes.isra.3+0x4d/0x70
[drm_kms_helper]
 [<ffffffffa00adebe>] drm_fb_helper_hotplug_event+0x5e/0xe0 [drm_kms_helper]
 [<ffffffffa015f5ee>] intel_fbdev_output_poll_changed+0x1e/0x30 [i915]
 [<ffffffffa00a25d7>] drm_kms_helper_hotplug_event+0x27/0x30 [drm_kms_helper]
 [<ffffffffa00a26ad>] output_poll_execute+0x6d/0x1d0 [drm_kms_helper]
 [<ffffffff8109302c>] process_one_work+0x14c/0x3c0
 [<ffffffff81093894>] worker_thread+0x114/0x470
 [<ffffffff816cbdef>] ? __schedule+0x2af/0x8b0
 [<ffffffff81093780>] ? rescuer_thread+0x310/0x310
 [<ffffffff810993d8>] kthread+0xd8/0xf0
 [<ffffffff81099300>] ? kthread_park+0x60/0x60
 [<ffffffff816d02df>] ret_from_fork+0x3f/0x70
 [<ffffffff81099300>] ? kthread_park+0x60/0x60
---[ end trace a4f3b246a07cdeff ]---

-- are displayed.

Bisecting the kernel, the following "bad commit" is identified --

eddfcbcdc27fbecb33bff098967bbdd7ca75bfa6 is the first bad commit
commit eddfcbcdc27fbecb33bff098967bbdd7ca75bfa6
Author: Maarten Lankhorst <maarten.lankhorst at linux.intel.com>
Date:   Mon Jun 15 12:33:53 2015 +0200

    drm/i915: Update less state during modeset.

    No need to repeatedly call update_watermarks, or update_fbc.
    Down to a single call to update_watermarks in .crtc_enable

    Signed-off-by: Maarten Lankhorst <maarten.lankhorst at linux.intel.com>
    Reviewed-by: Matt Roper <matthew.d.roper at intel.com>
    Tested-by(IVB): Matt Roper <matthew.d.roper at intel.com>
    Signed-off-by: Daniel Vetter <daniel.vetter at ffwll.ch>

:040000 040000 0b47d48b159bb87bff39ae05095746d487c04372
43ac83106c605cce79c28811014ac41dd9069af8 M      drivers

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