[Bug 105949] New: System stall on Supermicro SKL boards on drm-tip

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=105949

            Bug ID: 105949
           Summary: System stall on Supermicro SKL boards on drm-tip
           Product: DRI
           Version: unspecified
          Hardware: Other
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: dmitry.ermilov at intel.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Created attachment 138696
  --> https://bugs.freedesktop.org/attachment.cgi?id=138696&action=edit
dmesg_drm-tip_4.16.0-rc7+

It occurs that Supermicro boards can't be booted using drm-tip.
We see the issue on specifically this hardware:
* Supermicro SYS-5019S-ML/X11SSH-F, BIOS 2.0c 10/06/2017 
* video card device ID 0x191d

OS:
CentOS 7 (7.4), kernel updated to drm-tip taken last week @ this revision:
commit 29940f138482ff38047287ad288cea1fcf1f73b4
Author: Oleksandr Andrushchenko <oleksandr_andrushchenko at epam.com>
Date:   Tue Apr 3 16:24:20 2018 +0300
    drm-tip: 2018y-04m-03d-13h-23m-36s UTC integration manifest

An important note:
The systems can be loaded with additional parameters:
"intel_pstate=disable intel_idle.max_cstate=1"

however we see warnings from i915:
[    2.978031] [drm:skl_set_cdclk [i915]] *ERROR* DPLL0 not locked
[    2.991381] WARNING: CPU: 7 PID: 312 at
drivers/gpu/drm/i915/intel_cdclk.c:826 skl_get_cdclk+0x228/0x260 [i915]
[    3.004969] Modules linked in: i915(+) uas usb_storage sd_mod drm_kms_helper
syscopyarea sysfillrect sysimgblt fb_sys_fops drm igb ahci libahci libata dca
crc32c_intel i2c_algo_bit i2c_core video
[    3.034581] RIP: 0010:skl_get_cdclk+0x228/0x260 [i915]
[    3.131641]  intel_update_cdclk+0x1c/0x60 [i915]
[    3.139084]  skl_init_cdclk+0xe2/0x1c0 [i915]
[    3.146531]  intel_power_domains_init_hw+0x70c/0x9a0 [i915]
[    3.153976]  i915_driver_load+0x455/0xf20 [i915]
[    3.374369] WARNING: CPU: 7 PID: 312 at
drivers/gpu/drm/i915/intel_cdclk.c:826 skl_get_cdclk+0x228/0x260 [i915]
[    3.399330] WARNING: CPU: 7 PID: 312 at
drivers/gpu/drm/i915/intel_cdclk.c:826 skl_get_cdclk+0x228/0x260 [i915]
[    3.411999] Modules linked in: i915(+) uas usb_storage sd_mod drm_kms_helper
syscopyarea sysfillrect sysimgblt fb_sys_fops drm igb ahci libahci libata dca
crc32c_intel i2c_algo_bit i2c_core video
[    3.439025] RIP: 0010:skl_get_cdclk+0x228/0x260 [i915]
[    3.531009]  gen9_dc_off_power_well_enable+0x52/0x210 [i915]
[    3.538334]  intel_power_well_enable+0x36/0x40 [i915]
[    3.545707]  __intel_display_power_get_domain+0x7c/0x90 [i915]
[    3.553179]  intel_display_power_get+0x2e/0x40 [i915]
[    3.560683]  intel_display_set_init_power+0x33/0x40 [i915]
[    3.568215]  intel_power_domains_init_hw+0x6e/0x9a0 [i915]
[    3.575766]  i915_driver_load+0x455/0xf20 [i915]
[    3.799758] WARNING: CPU: 7 PID: 312 at
drivers/gpu/drm/i915/intel_cdclk.c:826 skl_get_cdclk+0x228/0x260 [i915]
[    3.818843] [drm] Finished loading DMC firmware i915/skl_dmc_ver1_27.bin
(v1.27)
[    4.122568] [drm] Initialized i915 1.6.0 20180308 for 0000:00:02.0 on minor
0

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