Bug 97275

Created attachment 125660 [details]
kern.log

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: 4.7.0-rc7 895a714 from http://cgit.freedesktop.org/drm-intel/ with https://patchwork.freedesktop.org/patch/99445/ applied
  commit 895a714b0b596cfcbe82065f99376ad02d369125
  Author: Daniel Vetter <daniel.vetter@ffwll.ch>
  Date:   Mon Jul 18 14:35:39 2016 +0200
  drm-intel-nightly: 2016y-07m-18d-12h-35m-15s UTC integration manifest
drm: libdrm-2.4.68-15 2212a64 from 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-1.18.0-460 e8e3675 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
DMC 1.07 from https://01.org/linuxgraphics/downloads/broxton-dmc-1.07
Intel-Gpu-Tools 1.15-127 ee5d5c4 from http://anongit.freedesktop.org/git/xorg/app/intel-gpu-tools.git

Steps:
------
1. Boot
2. Reboot several times
3. Check GuC load status

Actual result
--------------
3. Sometimes GuC does not load:
Jul  5 16:56:27 BXTP5 kernel: [    1.689144] [drm:intel_guc_setup] GuC fw status: path i915/bxt_guc_ver8_7.bin, fetch SUCCESS, load NONE

but 5 minutes later, on the next reboot cycle:

Jul  5 17:01:44 BXTP5 kernel: [    1.711802] i915 0000:00:02.0: Direct firmware load for i915/bxt_guc_ver8_7.bin failed with error -2

Expected result:
----------------
3. GuC successfully loads each time

Info
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From Dave, https://bugs.freedesktop.org/show_bug.cgi?id=96526#c38:
The kernel logs for each cycle look generally similar, but the order of some operations is not identical. In particular, the appearance of the MMC devices can come before OR after the attempt to load the GuC firmware.