[Bug 108788] [CI][BAT] igt@* - dmesg-warn - *ERROR* Panel status timeout

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=108788

--- Comment #2 from Ville Syrjala <ville.syrjala at linux.intel.com> ---
The power sequencer delays are as follows:
> <7> [310.447602] [drm:intel_dp_init_panel_power_sequencer [i915]] panel power up delay 200, power down delay 50, power cycle delay 600
> <7> [310.447694] [drm:intel_dp_init_panel_power_sequencer [i915]] backlight on   delay 1, off delay 200
> <7> [310.447792] [drm:intel_dp_init_panel_power_sequencer_registers [i915]] panel power sequencer register settings: PP_ON 0x47d00001, PP_OFF 0x1f40001, PP_DIV 0x186906


(In reply to Martin Peres from comment #0)
> The tests igt at drv_selftest@live_sanitycheck, igt at drv_module_reload@*, hit
> this issue on ILK:
> 
> <7> [311.456003] [drm:edp_panel_on [i915]] Turn eDP port A panel power on
> <7> [311.456068] [drm:wait_panel_power_cycle [i915]] Wait for panel power
> cycle
> <7> [311.456213] [drm:wait_panel_status [i915]] mask b800000f value 00000000
> status 00000000 control abcd0008
> <7> [311.456310] [drm:wait_panel_status [i915]] Wait complete

Panel is now in S0.0, power cycle delay not active.

> <7> [311.456397] [drm:edp_panel_on [i915]] Wait for panel power on
> <7> [311.456488] [drm:wait_panel_status [i915]] mask b000000f value 80000008
> status 9000000a control abcd0009

We just turned on the panel, and it has immediately reached S1.2.

> <7> [311.531334] [drm:asle_work [i915]] bclp = 0x800000ea
> <3> [316.458093] [drm:wait_panel_status [i915]] *ERROR* Panel status
> timeout: status 90000009 control abcd0009
> <7> [316.458245] [drm:wait_panel_status [i915]] Wait complete

Timeout after five seconds and the panel has only reached S1.1. Based on the
earlier information T1+T2 was 200 ms, so we should have reached this state long
ago. And the T5 delay is only 100 usec so we should reach S1.0 real soon now.

> <7> [316.458851] [drm:edp_panel_vdd_on [i915]] PP_STATUS: 0x90000009 PP_CONTROL: 0xabcd000b

600 usec elapsed, and we're still in S1.1.

So feels like the state machine is making progress, but much slower than
expected. PP_DIV 0x186906 is consistent with the rawclk readout
> <7> [310.440356] [drm:i915_driver_load [i915]] rawclk rate: 125000 kHz

This all looks rather strange. Maybe some clock gating w/a getting applied too
late?

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