[Bug 96614] [BAT BDW] *ERROR* failed to enable link training/failed to start channel equalization

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=96614

--- Comment #12 from Manasi <manasi.d.navare at intel.com> ---
To try this on the latest kernel, I have tested suspend-resume on the recent
kernel 4.8.0-rc5 on my BDW NUC and I dont see link training failures/dpcd
access retries. The IGT suspend-resume test passes:

[root at manasi-bdwnuc tests]# ./kms_pipe_crc_basic --run-subtest
suspend-read-crc-pipe-A
IGT-Version: 1.15-g9d18866 (x86_64) (Linux: 4.8.0-rc5-din-031116_0912+ x86_64)
rtcwake: wakeup from "mem" using /dev/rtc0 at Wed Sep 14 22:22:21 2016
suspend-read-crc-pipe-A: Testing connector DP-2 using pipe A
Subtest suspend-read-crc-pipe-A: SUCCESS (1.044s)

@Clayton: Could you tell me the configuration you were testing with HDMI that
got detected as DP and never worked for you with LSPCON?

The LSPCON patches would make a difference only if the LSPCON chip (Megachips)
is present on the motherboard and is enabled in the firmware. This is basically
an active level shifter for HDMI signals to DP. 

Please let me know the configurations you tried with HDMI and any debug logs if
you have. I am following up on if the final LSPCON patches are landed in our
driver.

Regards
Manasi

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