From: Adam Jackson Date: Thu, 21 Jul 2011 21:48:37 +0000 (-0400) Subject: drm/i915/dp: Explicitly disable symbol scrambling while training X-Git-Tag: firefly_0821_release~3680^2~4714^2~10^2~9^2~1 X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=81055854d096959898fdc17ed11729eb019eff07;p=firefly-linux-kernel-4.4.55.git drm/i915/dp: Explicitly disable symbol scrambling while training 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 Reviewed-by: Jesse Barnes Signed-off-by: Keith Packard --- diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c index 1c3a36feaf69..8aecb072466b 100644 --- a/drivers/gpu/drm/i915/intel_dp.c +++ b/drivers/gpu/drm/i915/intel_dp.c @@ -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);