[Bug 93699] New: [BAT BDW] sporadic WARNING: "Device suspended during HW access" during kms_pipe_crc_basic on pipe B/C

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=93699

            Bug ID: 93699
           Summary: [BAT BDW] sporadic WARNING: "Device suspended during
                    HW access" during kms_pipe_crc_basic on pipe B/C
           Product: DRI
           Version: XOrg git
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: daniel at ffwll.ch
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

This seems to be a fairly sporadic issue on bdw-ultra. See long-term view for
affected testcases:

/archive/results/CI_IGT_test/igt at kms_pipe_crc_basic@read-crc-pipe-b.html

/archive/results/CI_IGT_test/igt at kms_pipe_crc_basic@read-crc-pipe-c.html

I noticed this since it hit one of my own patch series. The testcase itself
passes, it's just dmesg backtrace that's upsetting. Backtrace looks like

[  308.179223] ------------[ cut here ]------------
[  308.179292] WARNING: CPU: 1 PID: 6179 at
drivers/gpu/drm/i915/intel_drv.h:1467 gen8_write32+0x230/0x2f0 [i915]()
[  308.179297] Device suspended during HW access
[  308.179300] Modules linked in: i915 ax88179_178a i2c_hid
x86_pkg_temp_thermal intel_powerclamp coretemp crct10dif_pclmul crc32_pclmul
cdc_ncm usbnet mii mei_me mei lpc_ich i2c_designware_platform
i2c_designware_core e1000e sdhci_pci ptp pps_core sdhci_acpi sdhci mmc_core
[last unloaded: i915]
[  308.179356] CPU: 1 PID: 6179 Comm: kms_pipe_crc_ba Tainted: G     U         
4.4.0-gfxbench+ #1
[  308.179361] Hardware name: Intel Corporation Broadwell Client
platform/Wilson Beach SDS, BIOS BDW-E2R1.86C.0095.R09.1410300006 10/30/2014
[  308.179365]  ffffffffa03b8db0 ffff880242d97908 ffffffff813df90c
ffff880242d97950
[  308.179376]  ffff880242d97940 ffffffff810746e1 0000000000045110
ffff880089cf0000
[  308.179385]  ffff8800aa6d67b0 0000000008670a00 ffff880242d97a40
ffff880242d979a0
[  308.179394] Call Trace:
[  308.179406]  [<ffffffff813df90c>] dump_stack+0x4e/0x82
[  308.179414]  [<ffffffff810746e1>] warn_slowpath_common+0x81/0xc0
[  308.179419]  [<ffffffff81074767>] warn_slowpath_fmt+0x47/0x50
[  308.179466]  [<ffffffffa03226c0>] gen8_write32+0x230/0x2f0 [i915]
[  308.179491]  [<ffffffffa02d3988>] _ilk_disable_lp_wm+0x98/0xd0 [i915]
[  308.179517]  [<ffffffffa02d8ebf>] ilk_program_watermarks+0x3ef/0x880 [i915]
[  308.179544]  [<ffffffffa02d9582>] ilk_initial_watermarks+0x102/0x120 [i915]
[  308.179594]  [<ffffffffa0344c91>] intel_pre_plane_update+0x81/0xf0 [i915]
[  308.179642]  [<ffffffffa0345635>] intel_atomic_commit+0x525/0x17c0 [i915]
[  308.179652]  [<ffffffff8150dc45>] ? drm_atomic_check_only+0x145/0x660
[  308.179658]  [<ffffffff8150d728>] ?
drm_atomic_set_crtc_for_connector+0x38/0xe0
[  308.179664]  [<ffffffff8150e192>] drm_atomic_commit+0x32/0x50
[  308.179673]  [<ffffffff814eb155>] drm_atomic_helper_set_config+0x75/0xb0
[  308.179680]  [<ffffffff814fd090>] drm_mode_set_config_internal+0x60/0x110
[  308.179687]  [<ffffffff81501e26>] drm_mode_setcrtc+0x186/0x4f0
[  308.179693]  [<ffffffff81183ef8>] ? __might_fault+0x48/0xa0
[  308.179700]  [<ffffffff814f3eed>] drm_ioctl+0x13d/0x590
[  308.179707]  [<ffffffff81501ca0>] ? drm_mode_setplane+0x1b0/0x1b0
[  308.179714]  [<ffffffff811d4c4c>] do_vfs_ioctl+0x2fc/0x550
[  308.179722]  [<ffffffff8179a8a6>] ? int_ret_from_sys_call+0x52/0x9f
[  308.179730]  [<ffffffff811e06ba>] ? __fget_light+0x6a/0x90
[  308.179735]  [<ffffffff811d4edc>] SyS_ioctl+0x3c/0x70
[  308.179741]  [<ffffffff8179a71b>] entry_SYSCALL_64_fastpath+0x16/0x73
[  308.179747] ---[ end trace d0b8db053feb462f ]---

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