[Bug 94338] Kernel DRM/i915 init sends eDP panel into self-test loop

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=94338

--- Comment #15 from infernix at infernix.net ---
I did a git bisect on linus' master tree and found this commit to be the cause
of the selftest: 

> commit 4b7ab5fca1976a53d59ef1558ddb06ba69fab356
> Author: Animesh Manna <animesh.manna at intel.com>
> Date:   Wed Aug 26 01:36:05 2015 +0530
>
>    drm/i915/skl: Added a check for the hardware status of csr fw before loading.

Before this commit, the panel goes black/blank/off at kernel boot + i915/drm
init; after it, the panel enters the red/green/blue selftest loop.

> <vsyrjala> infernix: weird. can you remove all dmc firmware files from /lib/firmware/i915 and try again with nightly?

With patch v2 reverted and on current drm nightly
(a838d7e77d17a65bc949f59d32d87ba5b9770816) with *only* the following in
/lib/firmware/i915:

-rw-r--r--  1 root root 109636 Feb 24 09:58 skl_guc_ver1_1059.bin
lrwxrwxrwx  1 root root     21 Feb 24 09:58 skl_guc_ver1.bin ->
skl_guc_ver1_1059.bin
-rw-r--r--  1 root root 128320 Feb 24 09:58 skl_guc_ver4_3.bin
lrwxrwxrwx  1 root root     18 Feb 24 09:58 skl_guc_ver4.bin ->
skl_guc_ver4_3.bin

I still get the self-test pattern, despite this:

[    5.245675] i915 0000:00:02.0: Direct firmware load for
i915/skl_dmc_ver1.bin failed with error -2
[    5.245679] i915 0000:00:02.0: Failed to load DMC firmware
[https://01.org/linuxgraphics/intel-linux-graphics-firmwares], disabling
runtime power management.

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