linux-kernel - Re: [WARNING] v5.12-rc1 in intel_pipe

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Date:   Mon, 1 Mar 2021 12:54:13 -0500
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Ville Syrjälä <ville.syrjala@...ux.intel.com>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        David Airlie <airlied@...ux.ie>,
        intel-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org,
        Rodrigo Vivi <rodrigo.vivi@...el.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: [WARNING] v5.12-rc1 in intel_pipe_disable tracepoint

On Mon, 1 Mar 2021 19:20:59 +0200
Ville Syrjälä <ville.syrjala@...ux.intel.com> wrote:


> >   ilk_crtc_disable+0x85/0x390 [i915]  
> 
> But this part is confusing me. intel_crtc_get_vblank_counter() is
> only supposed to do drm_crtc_accurate_vblank_count() fallback when
> the hardware lacks a working frame counter, and that should only
> be the case for ancient gen2 or semi-ancient i965gm TV output,
> ilk_crtc_disable() is not the function we should be calling in
> either of those cases.
> 
> What hardware do you have?
> 

According to "lspci -vvv"

00:02.0 VGA compatible controller: Intel Corporation Xeon E3-1200 v2/3rd Gen Core processor Graphics Controller (rev 09) (prog-if 00 [VGA controller])
        DeviceName:  Onboard VGA
        Subsystem: Hewlett-Packard Company Device 339a
        Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx+
        Status: Cap+ 66MHz- UDF- FastB2B+ ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
        Latency: 0
        Interrupt: pin A routed to IRQ 28
        Region 0: Memory at f7800000 (64-bit, non-prefetchable) [size=4M]
        Region 2: Memory at e0000000 (64-bit, prefetchable) [size=256M]
        Region 4: I/O ports at f000 [size=64]
        Expansion ROM at 000c0000 [virtual] [disabled] [size=128K]
        Capabilities: [90] MSI: Enable+ Count=1/1 Maskable- 64bit-
                Address: fee20004  Data: 0022
        Capabilities: [d0] Power Management version 2
                Flags: PMEClk- DSI+ D1- D2- AuxCurrent=0mA PME(D0-,D1-,D2-,D3hot-,D3cold-)
                Status: D0 NoSoftRst- PME-Enable- DSel=0 DScale=0 PME-
        Capabilities: [a4] PCI Advanced Features
                AFCap: TP+ FLR+
                AFCtrl: FLR-
                AFStatus: TP-
        Kernel driver in use: i915
        Kernel modules: i915

Note, this is a dev box that is only connected to a KVM and I haven't
connected to it outside of ssh in years.

-- Steve