drm/i915: fetch eDP configuration data from the VBT

We need to use some of these values in eDP configurations, so be sure to
fetch them and store them in the i915 private structure.

Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>

1 files changed, 49 insertions, 11 deletions

diff --git a/drivers/gpu/drm/i915/intel_bios.c b/drivers/gpu/drm/i915/intel_bios.c
index b1f73ac0f3fd..cc15447eff41 100644
--- a/drivers/gpu/drm/i915/intel_bios.c
+++ b/drivers/gpu/drm/i915/intel_bios.c
@@ -24,6 +24,7 @@
  *    Eric Anholt <eric@anholt.net>
  *
  */
+#include <drm/drm_dp_helper.h>
 #include "drmP.h"
 #include "drm.h"
 #include "i915_drm.h"
@@ -413,6 +414,8 @@ static void
 parse_edp(struct drm_i915_private *dev_priv, struct bdb_header *bdb)
 {
         struct bdb_edp *edp;
+        struct edp_power_seq *edp_pps;
+        struct edp_link_params *edp_link_params;
 
         edp = find_section(bdb, BDB_EDP);
         if (!edp) {
@@ -437,19 +440,54 @@ parse_edp(struct drm_i915_private *dev_priv, struct bdb_header *bdb)
                 break;
         }
 
-        dev_priv->edp.rate = edp->link_params[panel_type].rate;
-        dev_priv->edp.lanes = edp->link_params[panel_type].lanes;
-        dev_priv->edp.preemphasis = edp->link_params[panel_type].preemphasis;
-        dev_priv->edp.vswing = edp->link_params[panel_type].vswing;
+        /* Get the eDP sequencing and link info */
+        edp_pps = &edp->power_seqs[panel_type];
+        edp_link_params = &edp->link_params[panel_type];
 
-        DRM_DEBUG_KMS("eDP vBIOS settings: bpp=%d, rate=%d, lanes=%d, preemphasis=%d, vswing=%d\n",
-                      dev_priv->edp.bpp,
-                      dev_priv->edp.rate,
-                      dev_priv->edp.lanes,
-                      dev_priv->edp.preemphasis,
-                      dev_priv->edp.vswing);
+        dev_priv->edp.pps = *edp_pps;
 
-        dev_priv->edp.initialized = true;
+        dev_priv->edp.rate = edp_link_params->rate ? DP_LINK_BW_2_7 :
+                DP_LINK_BW_1_62;
+        switch (edp_link_params->lanes) {
+        case 0:
+                dev_priv->edp.lanes = 1;
+                break;
+        case 1:
+                dev_priv->edp.lanes = 2;
+                break;
+        case 3:
+        default:
+                dev_priv->edp.lanes = 4;
+                break;
+        }
+        switch (edp_link_params->preemphasis) {
+        case 0:
+                dev_priv->edp.preemphasis = DP_TRAIN_PRE_EMPHASIS_0;
+                break;
+        case 1:
+                dev_priv->edp.preemphasis = DP_TRAIN_PRE_EMPHASIS_3_5;
+                break;
+        case 2:
+                dev_priv->edp.preemphasis = DP_TRAIN_PRE_EMPHASIS_6;
+                break;
+        case 3:
+                dev_priv->edp.preemphasis = DP_TRAIN_PRE_EMPHASIS_9_5;
+                break;
+        }
+        switch (edp_link_params->vswing) {
+        case 0:
+                dev_priv->edp.vswing = DP_TRAIN_VOLTAGE_SWING_400;
+                break;
+        case 1:
+                dev_priv->edp.vswing = DP_TRAIN_VOLTAGE_SWING_600;
+                break;
+        case 2:
+                dev_priv->edp.vswing = DP_TRAIN_VOLTAGE_SWING_800;
+                break;
+        case 3:
+                dev_priv->edp.vswing = DP_TRAIN_VOLTAGE_SWING_1200;
+                break;
+        }
 }
 
 static void