drm/i915: Set PCH_NOP

Set up PCH_NOP when we match a certain platform.

v2: Just do a num_pipes check + comment instead of trying to check the
platform (Daniel)

Signed-off-by: Ben Widawsky <ben@bwidawsk.net>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

1 files changed, 9 insertions, 0 deletions

diff --git a/drivers/gpu/drm/i915/i915_drv.c b/drivers/gpu/drm/i915/i915_drv.c
index 3b4b9c09a20b..88d78e39bf6d 100644
--- a/drivers/gpu/drm/i915/i915_drv.c
+++ b/drivers/gpu/drm/i915/i915_drv.c
@@ -397,6 +397,15 @@ void intel_detect_pch(struct drm_device *dev)
         struct drm_i915_private *dev_priv = dev->dev_private;
         struct pci_dev *pch;
 
+        /* In all current cases, num_pipes is equivalent to the PCH_NOP setting
+         * (which really amounts to a PCH but no South Display).
+         */
+        if (INTEL_INFO(dev)->num_pipes == 0) {
+                dev_priv->pch_type = PCH_NOP;
+                dev_priv->num_pch_pll = 0;
+                return;
+        }
+
         /*
          * The reason to probe ISA bridge instead of Dev31:Fun0 is to
          * make graphics device passthrough work easy for VMM, that only