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<head>
<base href="https://bugs.freedesktop.org/" />
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<body><table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - [byt] Bad powerwell for display reg read during interrupt handler"
href="https://bugs.freedesktop.org/show_bug.cgi?id=93738">93738</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>[byt] Bad powerwell for display reg read during interrupt handler
</td>
</tr>
<tr>
<th>Product</th>
<td>DRI
</td>
</tr>
<tr>
<th>Version</th>
<td>DRI git
</td>
</tr>
<tr>
<th>Hardware</th>
<td>Other
</td>
</tr>
<tr>
<th>OS</th>
<td>All
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>medium
</td>
</tr>
<tr>
<th>Component</th>
<td>DRM/Intel
</td>
</tr>
<tr>
<th>Assignee</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>chris@chris-wilson.co.uk
</td>
</tr>
<tr>
<th>QA Contact</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
</tr>
<tr>
<th>CC</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
</tr></table>
<p>
<div>
<pre>[ 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 ]---</pre>
</div>
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