| From 2c57b18adb93fc070039538f1ce375d3d3e99bbb Mon Sep 17 00:00:00 2001 |
| From: Daniel Vetter <daniel.vetter@ffwll.ch> |
| Date: Tue, 13 Dec 2016 20:54:14 +0100 |
| Subject: drm/i915: tune down the fast link training vs boot fail |
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| From: Daniel Vetter <daniel.vetter@ffwll.ch> |
| |
| 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> |
| |
| --- |
| drivers/gpu/drm/i915/intel_dp.c | 4 ++-- |
| 1 file changed, 2 insertions(+), 2 deletions(-) |
| |
| --- a/drivers/gpu/drm/i915/intel_dp.c |
| +++ b/drivers/gpu/drm/i915/intel_dp.c |
| @@ -4019,8 +4019,8 @@ intel_dp_check_link_status(struct intel_ |
| 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 */ |
