[Bug 108800] [CI][BAT] igt at pm_rpm@(module-reload|basic-rte) - fail - Failed assertion: setup_environment()

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=108800

--- Comment #5 from Imre Deak <imre.deak at intel.com> ---
(In reply to Vanshidhar Konda from comment #4)
> This test seems to fail mostly on the BSW and BYT systems. Here's the
> observations I've made so far:
> 
> 1) The kernel device usage count for suspending the device is higher (+1) in
> the failed execution of the test than the successful execution.
> 
> 2) When the test disables all screens (through modeset) power-wells in the
> display domain are being turned off - except the display and always-on
> power-wells.
> 
> 3) In the failed case, there is a difference in the wakeref acquire/release
> log. The following wakerefs don't happen for the successful executions.
> Wakeref last acquired:
>    intel_display_power_get+0x18/0x50 [i915]
>    intel_power_domains_init_hw+0x90/0x500 [i915]
>    intel_power_domains_resume+0x3d/0x70 [i915]
>    i915_pm_resume_early+0x9d/0x130 [i915]
>    dpm_run_callback+0x64/0x280
>    device_resume_early+0xa6/0xe0
>    async_resume_early+0x14/0x40
>    async_run_entry_fn+0x34/0x160
> Wakeref last released:
>    i915_drm_suspend_late+0xad/0x120 [i915]
>    dpm_run_callback+0x64/0x280
>    __device_suspend_late+0xad/0x140
>    async_suspend_late+0x15/0x90
>    async_run_entry_fn+0x34/0x160
>    process_one_work+0x245/0x610
>    worker_thread+0x37/0x380
>    kthread+0x119/0x130
> 
> Possible reasons for failure:
> The display and always-on power-wells have a higher reference count than the
> rest of the power-wells in the display domain.
> 
> Next steps:
> 1) Confirm that the reference count on display and always-on power-wells is
> different between test fail/success case.
> 2) If confirmed, try to figure out the reason for extra reference count on
> the power-wells in question.

This could be due to the audio driver not suspending.

Could you provide the contents of
/sys/kernel/debug/dri/0/i915_power_domain_info after all screen gets disabled
(with runtime PM enabled for both the i915 and the audio driver)?

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