[Bug 111917] [CI][BAT] igt at runner@aborted - fail - TAINT_WARN: WARN_ON has happened, trying to change cdclk frequency with cdclk not enabled

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=111917

Matt Roper <matthew.d.roper at intel.com> changed:

           What    |Removed                     |Added
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                 CC|                            |matthew.d.roper at intel.com

--- Comment #2 from Matt Roper <matthew.d.roper at intel.com> ---
The LPCPLL_CTL register that's supposed to be set by the BIOS is seemingly
giving us invalid values now:

[drm:intel_power_domains_init_hw [i915]] *ERROR* CDCLK source is not
[drm:intel_power_domains_init_hw [i915]] *ERROR* LCPLL is disabled

The driver just reports these problems and doesn't try to correct them:

    /*                                                                       
     * The LCPLL register should be turned on by the BIOS. For now           
     * let's just check its state and print errors in case                   
     * something is wrong.  Don't even try to turn it on.                    
     */                                                                      

so it's not a surprise that later bdw_set_cdclk() reads LCPLL_CTL and still
finds it disabled, triggering the warning.

I also notice that the cdclk frequency when the driver starts up is reading out
as 800 MHz, which I don't believe is even a valid frequency for this platform.

As far as I can see, no patches went into the driver between CI runs 7021 and
7022 that should change the hardware readout.  Has anything else changed with
this machine recently (e.g., BIOS update or anything)?  Also, is this a real
machine or is it a guest running under virtualization with GVT?  I'm not sure
exactly what the 'gvtdvm' in the machine name signifies.

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