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drm/i915: force link training when requested by Sink 

Compliance test 4.3.1.11 requires source to perform link training
always if the automated test requests for it. This patch
enforces this requirement.

Signed-off-by: Sivakumar Thulasimani <sivakumar.thulasimani@intel.com>
Signed-off-by: Shubhangi Shrivastava <shubhangi.shrivastava@intel.com>
Reviewed-by: Sonika Jindal <sonika.jindal@intel.com
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Shubhangi Shrivastava 2015-10-14 14:56:49 +05:30 committed by Daniel Vetter
parent 4df6960e09
commit 14631e9d74
1 changed files with 3 additions and 1 deletions
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4
drivers/gpu/drm/i915/intel_dp.c
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@ -4316,7 +4316,9 @@ intel_dp_check_link_status(struct intel_dp *intel_dp)
DRM_DEBUG_DRIVER("CP or sink specific irq unhandled\n");
}
if (!drm_dp_channel_eq_ok(link_status, intel_dp->lane_count)) {
/* if link training is requested we should perform it always */
if ((intel_dp->compliance_test_type == DP_TEST_LINK_TRAINING) ||
(!drm_dp_channel_eq_ok(link_status, intel_dp->lane_count))) {
DRM_DEBUG_KMS("%s: channel EQ not ok, retraining\n",
intel_encoder->base.name);
intel_dp_start_link_train(intel_dp);