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drm/i915: clean up VBT eDP link param decoding 

Use defines, do not set anything if VBT has values unknown to us.

Reviewed-by: Damien Lespiau <damien.lespiau@intel.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
This commit is contained in:
Jani Nikula 2014-05-06 14:56:51 +03:00
parent eeb6324dd6
commit e13e2b2c46
1 changed files with 38 additions and 14 deletions
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52
drivers/gpu/drm/i915/intel_bios.c
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@ -560,47 +560,71 @@ parse_edp(struct drm_i915_private *dev_priv, struct bdb_header *bdb)
dev_priv->vbt.edp_pps = *edp_pps;
dev_priv->vbt.edp_rate = edp_link_params->rate ? DP_LINK_BW_2_7 :
DP_LINK_BW_1_62;
switch (edp_link_params->rate) {
case EDP_RATE_1_62:
dev_priv->vbt.edp_rate = DP_LINK_BW_1_62;
break;
case EDP_RATE_2_7:
dev_priv->vbt.edp_rate = DP_LINK_BW_2_7;
break;
default:
DRM_DEBUG_KMS("VBT has unknown eDP link rate value %u\n",
edp_link_params->rate);
break;
}
switch (edp_link_params->lanes) {
case 0:
case EDP_LANE_1:
dev_priv->vbt.edp_lanes = 1;
break;
case 1:
case EDP_LANE_2:
dev_priv->vbt.edp_lanes = 2;
break;
case 3:
default:
case EDP_LANE_4:
dev_priv->vbt.edp_lanes = 4;
break;
default:
DRM_DEBUG_KMS("VBT has unknown eDP lane count value %u\n",
edp_link_params->lanes);
break;
}
switch (edp_link_params->preemphasis) {
case 0:
case EDP_PREEMPHASIS_NONE:
dev_priv->vbt.edp_preemphasis = DP_TRAIN_PRE_EMPHASIS_0;
break;
case 1:
case EDP_PREEMPHASIS_3_5dB:
dev_priv->vbt.edp_preemphasis = DP_TRAIN_PRE_EMPHASIS_3_5;
break;
case 2:
case EDP_PREEMPHASIS_6dB:
dev_priv->vbt.edp_preemphasis = DP_TRAIN_PRE_EMPHASIS_6;
break;
case 3:
case EDP_PREEMPHASIS_9_5dB:
dev_priv->vbt.edp_preemphasis = DP_TRAIN_PRE_EMPHASIS_9_5;
break;
default:
DRM_DEBUG_KMS("VBT has unknown eDP pre-emphasis value %u\n",
edp_link_params->preemphasis);
break;
}
switch (edp_link_params->vswing) {
case 0:
case EDP_VSWING_0_4V:
dev_priv->vbt.edp_vswing = DP_TRAIN_VOLTAGE_SWING_400;
break;
case 1:
case EDP_VSWING_0_6V:
dev_priv->vbt.edp_vswing = DP_TRAIN_VOLTAGE_SWING_600;
break;
case 2:
case EDP_VSWING_0_8V:
dev_priv->vbt.edp_vswing = DP_TRAIN_VOLTAGE_SWING_800;
break;
case 3:
case EDP_VSWING_1_2V:
dev_priv->vbt.edp_vswing = DP_TRAIN_VOLTAGE_SWING_1200;
break;
default:
DRM_DEBUG_KMS("VBT has unknown eDP voltage swing value %u\n",
edp_link_params->vswing);
break;
}
}