[Bug 96915] New: [APL] too many voltage retries / CPU pipe X FIFO underrun / audio errors when suspending to ram and crash after 20 iterations

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=96915

            Bug ID: 96915
           Summary: [APL] too many voltage retries / CPU pipe X FIFO
                    underrun / audio errors when suspending to ram and
                    crash after 20 iterations
           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: christophe.prigent at intel.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Created attachment 125053
  --> https://bugs.freedesktop.org/attachment.cgi?id=125053&action=edit
dmesg-error

Platform: APL system
CPU Name : Intel(R) Genuine Processor @ 1.1 GHz (family: 6, model: 12,
stepping: 9) 4 cores
QDF : Q6HE
SoC : B1
CRB : Apollo Lake DDR3L RVP1A FAB2
Reworks : R19, R20

Software 
Bios: 144_B10 APLK_B0_IFWI_X64_R_2016_06_27_0956_SPI_RVP1.bin from
\\gar\ec\proj\ba\CCG\APL
BIOS\External\BIOS_Release\Daily\v144_10_2016_WW27.1\IFWI\IFWI_RVP1_Release\IFWI
KSC: 1.15
Linux distribution: Ubuntu 16.04 64 bits
Kernel: tag drm-intel-testing-2016-07-11 4.7.0-rc6 0230e3c from
http://cgit.freedesktop.org/drm-intel/
commit 0230e3c4eb76cf8f57cf40db0e908b96b84e3911
Author: Chris Wilson <chris at chris-wilson.co.uk>
Date:   Sun Jul 10 13:24:46 2016 +0100
drm-intel-nightly: 2016y-07m-10d-12h-23m-38s UTC integration manifest
drm: libdrm-2.4.68-14 8c8d5ddfrom git://anongit.freedesktop.org/mesa/drm
mesa: mesa-11.2.2 3a9f628from git://anongit.freedesktop.org/mesa/mesa
cairo: 1.15.2 db8a7f1 from git://anongit.freedesktop.org/cairo
xserver: xorg-server-1.18.0-454 033888e from
git://git.freedesktop.org/git/xorg/xserver
xf86-video-intel: 2.99.917-676 26f8ab5 from
git://git.freedesktop.org/git/xorg/driver/xf86-video-intel
libva: libva-1.7.0-26 c36971c from git://git.freedesktop.org/git/vaapi/libva
vaapi-intel-driver: 1.7.0-53 bcde10d from
git://git.freedesktop.org/git/vaapi/intel-driver
GuC 8.7
DMC 1.07 from https://01.org/linuxgraphics/downloads/broxton-dmc-1.07

Steps:
------
1. Suspend to RAM and resume:
Execute commands
sudo -s 
echo mem > /sys/power/state
Wait 30 seconds
Resume with keyboard
2. Wait 30 seconds
3. Repeat previous steps several times

Actual results:
---------------
2. Log shows example:
[  136.397754] [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU
pipe B FIFO underrun
[  144.781652] [drm:intel_dp_link_training_clock_recovery [i915]] *ERROR*
failed to enable link training
[  144.804637] [drm:intel_dp_start_link_train [i915]] *ERROR* failed to start
channel equalization
[  154.070393] [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU
pipe C FIFO underrun

3. DUT crashed after 20 iterations

Expected result:
----------------
No such error
Suspend to ram and resume works each time

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