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Revert "drm/i915: try to train DP even harder"

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This reverts commit 0d71068835.

Not only that the commit introduces a bogus check (voltage_tries == 5
will never meet at the inserted code path), it brings the i915 driver
into an endless dp-train loop on HP Z1 desktop machine with IVY+eDP.

At least reverting this commit recovers the framebuffer (but X is
still broken by other reasons...)

Cc: <stable@vger.kernel.org>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Takashi Iwai 2013-03-11 18:40:16 +01:00 committed by Daniel Vetter
parent 3118a4f652
commit 3b4f819d5e
1 changed files with 1 additions and 1 deletions
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2
drivers/gpu/drm/i915/intel_dp.c
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@ -1930,7 +1930,7 @@ intel_dp_start_link_train(struct intel_dp *intel_dp)
for (i = 0; i < intel_dp->lane_count; i++)
if ((intel_dp->train_set[i] & DP_TRAIN_MAX_SWING_REACHED) == 0)
break;
if (i == intel_dp->lane_count && voltage_tries == 5) {
if (i == intel_dp->lane_count) {
++loop_tries;
if (loop_tries == 5) {
DRM_DEBUG_KMS("too many full retries, give up\n");