[Bug 93738] New: [byt] Bad powerwell for display reg read during interrupt handler

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=93738

            Bug ID: 93738
           Summary: [byt] Bad powerwell for display reg read during
                    interrupt handler
           Product: DRI
           Version: DRI git
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: chris at chris-wilson.co.uk
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

[   49.870424] ------------[ cut here ]------------
[   49.870438] WARNING: CPU: 0 PID: 0 at
drivers/gpu/drm/i915/intel_uncore.c:638 __unclaimed_reg_debug+0x6d/0x80()
[   49.870441] Unclaimed register detected after reading register 0x1f0024
[   49.870446] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 4.4.0+ #1046
[   49.870448] Hardware name:
\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff
\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff\xffffffff/DN2820FYK,
BIOS FYBYT10H.86A.0032.2014.0414.1437 04/14/2014
[   49.870452]  ffffffff81807110 ffff88023fc03d30 ffffffff81286f3f
ffff88023fc03d78
[   49.870457]  ffff88023fc03d68 ffffffff8104d751 00000000001f0024
0000000000000000
[   49.870461]  0000000000000001 ffff880235050080 0000000000000001
ffff88023fc03dc8
[   49.870465] Call Trace:
[   49.870468]  <IRQ>  [<ffffffff81286f3f>] dump_stack+0x44/0x55
[   49.870478]  [<ffffffff8104d751>] warn_slowpath_common+0x81/0xc0
[   49.870482]  [<ffffffff8104d80c>] warn_slowpath_fmt+0x4c/0x50
[   49.870485]  [<ffffffff813d48fd>] __unclaimed_reg_debug+0x6d/0x80
[   49.870488]  [<ffffffff813d4e10>] vlv_read32+0x270/0x2a0
[   49.870494]  [<ffffffff8138502b>] valleyview_pipestat_irq_handler+0x9b/0x1c0
[   49.870497]  [<ffffffff813891ec>] valleyview_irq_handler+0xbc/0x160
[   49.870502]  [<ffffffff8108df88>] handle_irq_event_percpu+0x78/0x180
[   49.870506]  [<ffffffff8108e0bf>] handle_irq_event+0x2f/0x50
[   49.870510]  [<ffffffff810915f0>] handle_edge_irq+0xb0/0x180
[   49.870514]  [<ffffffff81005fdd>] handle_irq+0x1d/0x30
[   49.870519]  [<ffffffff815d2a9b>] do_IRQ+0x4b/0xd0
[   49.870524]  [<ffffffff815d10c1>] common_interrupt+0x81/0x81
[   49.870526]  <EOI>  [<ffffffff814d95d5>] ? cpuidle_enter_state+0x135/0x260
[   49.870533]  [<ffffffff814d9737>] cpuidle_enter+0x17/0x20
[   49.870538]  [<ffffffff81085937>] cpu_startup_entry+0x2a7/0x300
[   49.870542]  [<ffffffff815cb4f7>] rest_init+0x77/0x80
[   49.870546]  [<ffffffff81b05f30>] start_kernel+0x4e6/0x4f3
[   49.870550]  [<ffffffff81b0544e>] x86_64_start_reservations+0x2a/0x2c
[   49.870553]  [<ffffffff81b0553a>] x86_64_start_kernel+0xea/0xed
[   49.870555] ---[ end trace a36fe93ff40591ce ]---

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