[Intel-gfx] [PATCH] drm/i915: Fix LVDS detect for pre-9XX mobile chips

[Zhenyu Wang]

This brings fix from 2D driver:
Skip LVDS config parsing on pre-9xx chips.

Signed-off-by: Zhenyu Wang <zhenyu.z.wang at intel.com>
---
 drivers/gpu/drm/i915/intel_bios.c |    8 +++++++-
 1 files changed, 7 insertions(+), 1 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_bios.c b/drivers/gpu/drm/i915/intel_bios.c
index 6f668ee..bdc2ef2 100644
--- a/drivers/gpu/drm/i915/intel_bios.c
+++ b/drivers/gpu/drm/i915/intel_bios.c
@@ -156,12 +156,18 @@ static void
 parse_driver_features(struct drm_i915_private *dev_priv,
 		       struct bdb_header *bdb)
 {
+	struct drm_device *dev = dev_priv->dev;
 	struct bdb_driver_features *driver;
 
 	/* set default for mobile chips */
-	if (IS_MOBILE(dev_priv->dev) && !IS_I830(dev_priv->dev))
+	if (IS_MOBILE(dev) && !IS_I830(dev))
 		dev_priv->int_lvds_support = 1;
 
+	/* For pre-9xx mobile chips, LVDS config of driver feature
+	   block is undefined. */
+	if (!IS_I9XX(dev))
+		return;
+
 	driver = find_section(bdb, BDB_DRIVER_FEATURES);
 	if (driver && driver->lvds_config != BDB_DRIVER_FEATURE_INT_LVDS)
 		dev_priv->int_lvds_support = 0;
-- 
1.6.1.3