diff options
| author | Jani Nikula <jani.nikula@intel.com> | 2013-10-04 15:08:48 +0300 |
|---|---|---|
| committer | Daniel Vetter <daniel.vetter@ffwll.ch> | 2013-10-10 12:47:12 +0200 |
| commit | 2cdfe6c8efb9d7dab577d610b6cdab198482cec1 (patch) | |
| tree | 545d4a6547b142724bbb0f13abed4048032deb28 /drivers/gpu/drm/i915/intel_dp.c | |
| parent | c3d685a7a5cd9f18865a717468d2b02092dcefdd (diff) | |
drm/i915/dp: update training set in a burst write with training pattern set
The DP spec allows this, and requires it when full link training is
started with non-minimum voltage swing and/or non-zero pre-emphasis.
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Diffstat (limited to 'drivers/gpu/drm/i915/intel_dp.c')
| -rw-r--r-- | drivers/gpu/drm/i915/intel_dp.c | 28 |
1 files changed, 14 insertions, 14 deletions
diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c index 377014783e7..bee09e16725 100644 --- a/drivers/gpu/drm/i915/intel_dp.c +++ b/drivers/gpu/drm/i915/intel_dp.c @@ -2297,7 +2297,8 @@ intel_dp_set_link_train(struct intel_dp *intel_dp, struct drm_device *dev = intel_dig_port->base.base.dev; struct drm_i915_private *dev_priv = dev->dev_private; enum port port = intel_dig_port->port; - int ret; + uint8_t buf[sizeof(intel_dp->train_set) + 1]; + int ret, len; if (HAS_DDI(dev)) { uint32_t temp = I915_READ(DP_TP_CTL(port)); @@ -2367,22 +2368,21 @@ intel_dp_set_link_train(struct intel_dp *intel_dp, I915_WRITE(intel_dp->output_reg, *DP); POSTING_READ(intel_dp->output_reg); - ret = intel_dp_aux_native_write_1(intel_dp, DP_TRAINING_PATTERN_SET, - dp_train_pat); - if (ret != 1) - return false; - - if ((dp_train_pat & DP_TRAINING_PATTERN_MASK) != + buf[0] = dp_train_pat; + if ((dp_train_pat & DP_TRAINING_PATTERN_MASK) == DP_TRAINING_PATTERN_DISABLE) { - ret = intel_dp_aux_native_write(intel_dp, - DP_TRAINING_LANE0_SET, - intel_dp->train_set, - intel_dp->lane_count); - if (ret != intel_dp->lane_count) - return false; + /* don't write DP_TRAINING_LANEx_SET on disable */ + len = 1; + } else { + /* DP_TRAINING_LANEx_SET follow DP_TRAINING_PATTERN_SET */ + memcpy(buf + 1, intel_dp->train_set, intel_dp->lane_count); + len = intel_dp->lane_count + 1; } - return true; + ret = intel_dp_aux_native_write(intel_dp, DP_TRAINING_PATTERN_SET, + buf, len); + + return ret == len; } static bool |