From 8b0878a0a3a8da26a9766a2d3abd8768c21b4121 Mon Sep 17 00:00:00 2001 From: "Pandiyan, Dhinakaran" Date: Thu, 4 Aug 2016 13:48:35 -0700 Subject: [PATCH] drm/i915/dp: Add debug messages to print DP link training pattern Currently we do not print the training pattern used in any of the DP link training stages. Including this piece of information in debug messages will help debugging. Also, use the wrapper intel_dp_program_link_training_pattern() in intel_dp_enable_port() instead of implementing it. v2: Downgraded log level from error to debug (Chris) Signed-off-by: Dhinakaran Pandiyan Reviewed-by: Chris Wilson Signed-off-by: Rodrigo Vivi Link: http://patchwork.freedesktop.org/patch/msgid/1470343716-5574-2-git-send-email-dhinakaran.pandiyan@intel.com --- drivers/gpu/drm/i915/intel_dp.c | 13 +++++++------ 1 file changed, 7 insertions(+), 6 deletions(-) diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c index f3e17cdc4436..a3c7dd8fd406 100644 --- a/drivers/gpu/drm/i915/intel_dp.c +++ b/drivers/gpu/drm/i915/intel_dp.c @@ -2551,6 +2551,10 @@ _intel_dp_set_link_train(struct intel_dp *intel_dp, struct drm_i915_private *dev_priv = to_i915(dev); enum port port = intel_dig_port->port; + if (dp_train_pat & DP_TRAINING_PATTERN_MASK) + DRM_DEBUG_KMS("Using DP training pattern TPS%d\n", + dp_train_pat & DP_TRAINING_PATTERN_MASK); + if (HAS_DDI(dev)) { uint32_t temp = I915_READ(DP_TP_CTL(port)); @@ -2592,7 +2596,7 @@ _intel_dp_set_link_train(struct intel_dp *intel_dp, *DP |= DP_LINK_TRAIN_PAT_2_CPT; break; case DP_TRAINING_PATTERN_3: - DRM_ERROR("DP training pattern 3 not supported\n"); + DRM_DEBUG_KMS("TPS3 not supported, using TPS2 instead\n"); *DP |= DP_LINK_TRAIN_PAT_2_CPT; break; } @@ -2617,7 +2621,7 @@ _intel_dp_set_link_train(struct intel_dp *intel_dp, if (IS_CHERRYVIEW(dev)) { *DP |= DP_LINK_TRAIN_PAT_3_CHV; } else { - DRM_ERROR("DP training pattern 3 not supported\n"); + DRM_DEBUG_KMS("TPS3 not supported, using TPS2 instead\n"); *DP |= DP_LINK_TRAIN_PAT_2; } break; @@ -2632,11 +2636,8 @@ static void intel_dp_enable_port(struct intel_dp *intel_dp, struct drm_i915_private *dev_priv = to_i915(dev); /* enable with pattern 1 (as per spec) */ - _intel_dp_set_link_train(intel_dp, &intel_dp->DP, - DP_TRAINING_PATTERN_1); - I915_WRITE(intel_dp->output_reg, intel_dp->DP); - POSTING_READ(intel_dp->output_reg); + intel_dp_program_link_training_pattern(intel_dp, DP_TRAINING_PATTERN_1); /* * Magic for VLV/CHV. We _must_ first set up the register -- 2.20.1