Commit 1a125d8a authored by Imre Deak's avatar Imre Deak Committed by Jani Nikula

drm/i915: don't try to retrain a DP link on an inactive CRTC

Atm we may retrain the DP link even if the CRTC is inactive through
HPD work->intel_dp_check_link_status(). This in turn can lock up the PHY
(at least on BYT), since the DP port is disabled.

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=81948Signed-off-by: default avatarImre Deak <imre.deak@intel.com>
Reviewed-by: default avatarVille Syrjälä <ville.syrjala@linux.intel.com>
Cc: stable@vger.kernel.org (3.16+)
Signed-off-by: default avatarJani Nikula <jani.nikula@intel.com>
parent 07f9cd0b
...@@ -3553,6 +3553,9 @@ intel_dp_check_link_status(struct intel_dp *intel_dp) ...@@ -3553,6 +3553,9 @@ intel_dp_check_link_status(struct intel_dp *intel_dp)
if (WARN_ON(!intel_encoder->base.crtc)) if (WARN_ON(!intel_encoder->base.crtc))
return; return;
if (!to_intel_crtc(intel_encoder->base.crtc)->active)
return;
/* Try to read receiver status if the link appears to be up */ /* Try to read receiver status if the link appears to be up */
if (!intel_dp_get_link_status(intel_dp, link_status)) { if (!intel_dp_get_link_status(intel_dp, link_status)) {
return; return;
......
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