drm/i915: Verify Ironlake eDP presence on DP_A using the capability fuse

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>

diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index 8470a97..cb8f434 100644 (file)
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -2591,6 +2591,13 @@
 #define ILK_DISPLAY_CHICKEN2   0x42004
 #define  ILK_DPARB_GATE        (1<<22)
 #define  ILK_VSDPFD_FULL       (1<<21)
+#define ILK_DISPLAY_CHICKEN_FUSES      0x42014
+#define  ILK_INTERNAL_GRAPHICS_DISABLE (1<<31)
+#define  ILK_INTERNAL_DISPLAY_DISABLE  (1<<30)
+#define  ILK_DISPLAY_DEBUG_DISABLE     (1<<29)
+#define  ILK_HDCP_DISABLE              (1<<25)
+#define  ILK_eDP_A_DISABLE             (1<<24)
+#define  ILK_DESKTOP                   (1<<23)
 #define ILK_DSPCLK_GATE                0x42020
 #define  ILK_DPARB_CLK_GATE    (1<<5)
 /* According to spec this bit 7/8/9 of 0x42020 should be set to enable FBC */

diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 97e374e..fca5232 100644 (file)
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -5379,6 +5379,23 @@ static int intel_encoder_clones(struct drm_device *dev, int type_mask)
        return index_mask;
 }
 
+static bool has_edp_a(struct drm_device *dev)
+{
+       struct drm_i915_private *dev_priv = dev->dev_private;
+
+       if (!IS_MOBILE(dev))
+               return false;
+
+       if ((I915_READ(DP_A) & DP_DETECTED) == 0)
+               return false;
+
+       if (IS_GEN5(dev) &&
+           (I915_READ(ILK_DISPLAY_CHICKEN_FUSES) & ILK_eDP_A_DISABLE))
+               return false;
+
+       return true;
+}
+
 static void intel_setup_outputs(struct drm_device *dev)
 {
        struct drm_i915_private *dev_priv = dev->dev_private;
@@ -5396,7 +5413,7 @@ static void intel_setup_outputs(struct drm_device *dev)
        if (HAS_PCH_SPLIT(dev)) {
                dpd_is_edp = intel_dpd_is_edp(dev);
 
-               if (IS_MOBILE(dev) && (I915_READ(DP_A) & DP_DETECTED))
+               if (has_edp_a(dev))
                        intel_dp_init(dev, DP_A);
 
                if (dpd_is_edp && (I915_READ(PCH_DP_D) & DP_DETECTED))