[Bug 89055] [SKL APL] WARN_ON(!wm_changed) hit in the WM code with multiple pipes enabled

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=89055

--- Comment #63 from Oli <b52 at reaktor42.de> ---
(In reply to Matt Roper from comment #62)
> The series that fixes this bug has now been merged to our drm-intel-nightly
> branch.  It should land upstream in kernel 4.8.

Done th(In reply to Matt Roper from comment #61)
> (In reply to Matt Roper from comment #60)
> > (In reply to Oli from comment #59)
> > > Not sure if this is related, but I saw the same OOPSs in my dmesg log,
> > > though I assumed I apply this patch in order to get 4k output at 60 Hz.
> > > 
> > > Short background, I have a Dell XPS 13 9350 with an Intel Iris 540. See
> > > `lspci -vvnn` here: http://ix.io/DEG
> > > 
> > > I applied the patch and started the new kernel with i915.enable_rc6=0, in
> > > the hope that I could finally `xrandr --output DP1 --mode 3840x2160 --rate
> > > 60`. Though, when I issue this, my screen goes blank with the following
> > > error:
> > > 
> > [snip]
> > > 
> > > The whole dmesg is here: http://ix.io/DEH
> > > 
> > > Could someone give me a hint how to achieve 4k output with an refresh rate
> > > of 60 Hz?
> > > 
> > > Thanks in advance.
> > 
> > The message you're getting now doesn't appear to be related to watermarks,
> > so I don't think your problems are caused or fixed by my patch series
> > (although the message you see in your log now may have been hidden amid all
> > the noise that my patches have now removed).  Can you file a new bug for
> > that so that your issue doesn't get lost in the mix here?
> 
> Actually, I take that back; I missed the cpu_fifo_underrun_irq_handler line
> at the bottom.  That would imply some watermark issues, although I suspect
> they may be a different watermark issue related to scaling.  I have another
> series of patches I'll be posting after the one for this bugzilla lands, and
> I suspect that series may solve your scaling-related watermark problem.
> 
> Either way, please open a new bug report so we can track it separately from
> the WARN_ON(!wm_changed) stuff going on here.

Done that, the corresponding ticket is located at
https://bugs.freedesktop.org/show_bug.cgi?id=95392

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