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drm/i915: Try harder to complete DP training pattern 1

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In commit cdb0e95bf5
Author: Keith Packard <keithp@keithp.com>
Date:   Tue Nov 1 20:00:06 2011 -0700

    drm/i915: Try harder during dp pattern 1 link training

extra passes were made to retry the same voltage and then retry a full
clock reset. However, as coverity pointed out, we never tried the full
clock reset as we broke out of the loop early.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Damien Lespiau <damien.lespiau@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Chris Wilson 2012-09-26 16:48:30 +01:00 committed by Daniel Vetter
parent 7f6613412c
commit 2477367083
1 changed files with 5 additions and 10 deletions
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15
drivers/gpu/drm/i915/intel_dp.c
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@ -1798,8 +1798,7 @@ intel_dp_start_link_train(struct intel_dp *intel_dp)
if ((intel_dp->train_set[i] & DP_TRAIN_MAX_SWING_REACHED) == 0)
break;
if (i == intel_dp->lane_count && voltage_tries == 5) {
++loop_tries;
if (loop_tries == 5) {
if (++loop_tries == 5) {
DRM_DEBUG_KMS("too many full retries, give up\n");
break;
}
@ -1809,15 +1808,11 @@ intel_dp_start_link_train(struct intel_dp *intel_dp)
}
/* Check to see if we've tried the same voltage 5 times */
if ((intel_dp->train_set[0] & DP_TRAIN_VOLTAGE_SWING_MASK) == voltage) {
++voltage_tries;
if (voltage_tries == 5) {
DRM_DEBUG_KMS("too many voltage retries, give up\n");
break;
}
} else
if ((intel_dp->train_set[0] & DP_TRAIN_VOLTAGE_SWING_MASK) != voltage) {
voltage = intel_dp->train_set[0] & DP_TRAIN_VOLTAGE_SWING_MASK;
voltage_tries = 0;
voltage = intel_dp->train_set[0] & DP_TRAIN_VOLTAGE_SWING_MASK;
} else
++voltage_tries;
/* Compute new intel_dp->train_set as requested by target */
intel_get_adjust_train(intel_dp, link_status);