[Bug 80203] [HSW] trying to runtime suspend with power well enabled on 3.15

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=80203

--- Comment #13 from Imre Deak <imre.deak at gmail.com> ---
(In reply to comment #12)
> Created attachment 106104 [details]
> 3.17-rc4 dmesg with Ville's edp vdd locking patch backported
> 
> It looks much better after I backported Ville's patch.

Thanks, we'll consider then backporting Ville's fix.

> After a couple of reboots and over ten suspend/resume cycles
> I've only got one stack dump (which might be my fault).

If you mean the below stacktrace, that's b/c of the VGA thing. It's caused by
SPLL being on when we try to enable some power saving mode (PC8), which is an
invalid combination. SPLL is only used for VGA, but since we don't even
consider enabling VGA for HSW ULT platforms we won't ever touch SPLL. It's
still a mistery how it gets enabled though; first I thought it's simply the
BIOS during booting, but in your second log it seems to get enabled only before
the third suspend, so I have to think about this.

> [   95.314561] Call Trace:
> [   95.314564]  [<ffffffff82778f98>] dump_stack+0x45/0x56
> [   95.314567]  [<ffffffff8207132d>] warn_slowpath_common+0x7d/0xa0
> [   95.314570]  [<ffffffff8207139c>] warn_slowpath_fmt+0x4c/0x50
> [   95.314591]  [<ffffffffc0187fe8>] hsw_enable_pc8+0x5b8/0x660 [i915]
> [   95.314600]  [<ffffffffc012d1d0>] ? __i915_drm_thaw+0x1d0/0x1d0 [i915]
> [   95.314609]  [<ffffffffc012d22b>] i915_pm_suspend_late+0x5b/0x60 [i915]
> [   95.314611]  [<ffffffff824d17fc>] dpm_run_callback+0x4c/0x100
> [   95.314613]  [<ffffffff824d1fc0>] __device_suspend_late+0xb0/0x1a0
> [   95.314615]  [<ffffffff824d20cf>] async_suspend_late+0x1f/0xa0
> [   95.314617]  [<ffffffff820930c7>] async_run_entry_fn+0x37/0x130
> [   95.314620]  [<ffffffff8208a53a>] process_one_work+0x18a/0x4a0
> [   95.314622]  [<ffffffff8208b22b>] worker_thread+0x6b/0x5d0
> [   95.314625]  [<ffffffff8208b1c0>] ? pool_mayday_timeout+0x1b0/0x1b0
> [   95.314627]  [<ffffffff820905ab>] kthread+0xdb/0x100
> [   95.314629]  [<ffffffff820904d0>] ? kthread_create_on_node+0x180/0x180
> [   95.314632]  [<ffffffff82780ebc>] ret_from_fork+0x7c/0xb0
> [   95.314634]  [<ffffffff820904d0>] ? kthread_create_on_node+0x180/0x180
> 
> Imre, please create a new bug for the VGA thingy if you want me to continue
> testing it.

Ok, will do so.

Let's keep this one also open until we decide about a proper fix.

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