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drm/i915: tune down the fast link training vs boot fail

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commit 2c57b18adb93fc070039538f1ce375d3d3e99bbb upstream.

It's been unfixed since a while and no one is immediately working on
this. And we have the FIXME already. And now also a task in the DP
team's backlog.

Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: stable@vger.kernel.org
Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
References: https://lists.freedesktop.org/archives/intel-gfx/2016-July/101951.html
Acked-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
[danvet: Adjust comment per Ville's feedback.]
Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20161213195414.28923-1-daniel.vetter@ffwll.ch
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

(cherry picked from commit 2dd85aeb5bc99e3763dd192cdb95ff405a102c8a)
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
This commit is contained in:
Daniel Vetter 2016-12-13 20:54:14 +01:00 committed by Greg Kroah-Hartman
parent 8b4879154a
commit 1d9c33f1b4
1 changed files with 2 additions and 2 deletions
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4
drivers/gpu/drm/i915/intel_dp.c
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@ -4019,8 +4019,8 @@ intel_dp_check_link_status(struct intel_dp *intel_dp)
return;
/* FIXME: we need to synchronize this sort of stuff with hardware
* readout */
if (WARN_ON_ONCE(!intel_dp->lane_count))
* readout. Currently fast link training doesn't work on boot-up. */
if (!intel_dp->lane_count)
return;
/* if link training is requested we should perform it always */