[Bug 103844] New:=?UTF-8?Q?=20=E3=80=90braswell=E3=80=91?="*ERROR* cpu pipe A|B|C fifo underrun" - can not recovery

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=103844

            Bug ID: 103844
           Summary: 【braswell】"*ERROR* cpu pipe A|B|C fifo underrun" - can
                     not recovery
           Product: DRI
           Version: unspecified
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: critical
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: wkcl00022 at 163.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

our device which use [braswell] n3160 to decode&display report "pipe underrun"
accidentally, however, can not be recovery. we have two display modes for the
device. one is three hdmi display mode, another is hdmi&vga with same source
display mode. the relationship between pipe and connecter is pipeA - DP0     
 pipeB-HDMI_A3  pipeC-HDMI_A1. when this bug happens, the output of hdmi(or
vga) refer to related pipe is not correct. the condition to reproducting the
bug as follows:
1)kernel version: linux-4.2.x
2)drm version:libdrm-2.4.64
3)application: the layout of hdmi(or vga) output changed periodically for
10s，and each layout has several "windows" which maybe overlapped for display
decoded picture.so we also have decoder business on braswell.
4)now this bug is always happens after about 2 days when we run our business

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