drm/i915: Allow LVDS on pipe A on gen4+

The gen4 docs say it works, so why not.  Tested on Ironlake.

Signed-off-by: Adam Jackson <ajax@redhat.com>
Signed-off-by: Eric Anholt <eric@anholt.net>

2 files changed, 5 insertions, 1 deletions

diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 5a6980082064..eb4a265861ec 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -3303,7 +3303,9 @@ static int intel_crtc_mode_set(struct drm_crtc *crtc,
                         lvds_reg = PCH_LVDS;
 
                 lvds = I915_READ(lvds_reg);
-                lvds |= LVDS_PORT_EN | LVDS_A0A2_CLKA_POWER_UP | LVDS_PIPEB_SELECT;
+                lvds |= LVDS_PORT_EN | LVDS_A0A2_CLKA_POWER_UP;
+                if (pipe == 1)
+                        lvds |= LVDS_PIPEB_SELECT;
                 /* set the corresponsding LVDS_BORDER bit */
                 lvds |= dev_priv->lvds_border_bits;
                 /* Set the B0-B3 data pairs corresponding to whether we're going to
diff --git a/drivers/gpu/drm/i915/intel_lvds.c b/drivers/gpu/drm/i915/intel_lvds.c
index bc0ab7d57dbc..a69de00320bc 100644
--- a/drivers/gpu/drm/i915/intel_lvds.c
+++ b/drivers/gpu/drm/i915/intel_lvds.c
@@ -953,6 +953,8 @@ void intel_lvds_init(struct drm_device *dev)
 
         intel_encoder->clone_mask = (1 << INTEL_LVDS_CLONE_BIT);
         intel_encoder->crtc_mask = (1 << 1);
+        if (IS_I965G(dev))
+                intel_encoder->crtc_mask |= (1 << 0);
         drm_encoder_helper_add(encoder, &intel_lvds_helper_funcs);
         drm_connector_helper_add(connector, &intel_lvds_connector_helper_funcs);
         connector->display_info.subpixel_order = SubPixelHorizontalRGB;