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drm/i915/dp: Explicitly disable symbol scrambling while training

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The DP spec says training patterns 1 and 2 are to be sent non-scrambled,
and the GPU docs claim that happens (or at least, there's no explicit
scrambling control).  But the sink may be confused if we don't
explicitly tell it what we're doing, so play it safe.

Signed-off-by: Adam Jackson <ajax@redhat.com>
Reviewed-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Signed-off-by: Keith Packard <keithp@keithp.com>
This commit is contained in:
Adam Jackson 2011-07-21 17:48:37 -04:00 • committed by Keith Packard
parent 302983e905
commit 81055854d0
1 changed files with 4 additions and 2 deletions
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6
drivers/gpu/drm/i915/intel_dp.c
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@ -1370,7 +1370,8 @@ intel_dp_start_link_train(struct intel_dp *intel_dp)
reg = DP | DP_LINK_TRAIN_PAT_1;
if (!intel_dp_set_link_train(intel_dp, reg,
DP_TRAINING_PATTERN_1))
DP_TRAINING_PATTERN_1 |
DP_LINK_SCRAMBLING_DISABLE))
break;
/* Set training pattern 1 */
@ -1445,7 +1446,8 @@ intel_dp_complete_link_train(struct intel_dp *intel_dp)
/* channel eq pattern */
if (!intel_dp_set_link_train(intel_dp, reg,
DP_TRAINING_PATTERN_2))
DP_TRAINING_PATTERN_2 |
DP_LINK_SCRAMBLING_DISABLE))
break;
udelay(400);