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| author | Chris Wilson <chris@chris-wilson.co.uk> | 2012-09-26 16:48:30 +0100 |
|---|---|---|
| committer | Daniel Vetter <daniel.vetter@ffwll.ch> | 2012-10-04 10:33:41 +0200 |
| commit | 2477367083b3eaa97f87993ab26627a02f350551 (patch) | |
| tree | 0bdf7aff7dc85eb820a82ef9d5296c403bb26c71 /drivers | |
| parent | 7f6613412c0bf5945a78967e92bdcb00394215f4 (diff) | |
| download | linux-stable-2477367083b3eaa97f87993ab26627a02f350551.tar.gz linux-stable-2477367083b3eaa97f87993ab26627a02f350551.tar.bz2 linux-stable-2477367083b3eaa97f87993ab26627a02f350551.zip | |
drm/i915: Try harder to complete DP training pattern 1
In commit cdb0e95bf571dccc1f75fef9bdad21b167ef0b37
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>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/gpu/drm/i915/intel_dp.c | 15 |
1 files changed, 5 insertions, 10 deletions
diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c index c63f54e84847..c14d407d41e8 100644 --- a/drivers/gpu/drm/i915/intel_dp.c +++ b/drivers/gpu/drm/i915/intel_dp.c @@ -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); |